new stuff

vendor/assimp/test/unit/AbstractImportExportBase.cpp

@@ -0,0 +1,47 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+
+using namespace ::Assimp;
+
+AbstractImportExportBase::~AbstractImportExportBase() = default;

vendor/assimp/test/unit/AbstractImportExportBase.h

@@ -0,0 +1,75 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+#ifndef AI_ABSTRACTIMPORTEXPORTBASE_H_INC
+#define AI_ABSTRACTIMPORTEXPORTBASE_H_INC
+
+#include "UnitTestPCH.h"
+
+// ---------------------------------------------------------------------------
+/** Abstract base class to test import and export
+ */
+ // ---------------------------------------------------------------------------
+class AbstractImportExportBase : public ::testing::Test {
+public:
+    /// @brief  The class destructor.
+    virtual ~AbstractImportExportBase();
+
+    /// @brief  The importer-test, will return true for successful import.
+    /// @return true for success, false for failure.
+    virtual bool importerTest();
+
+    /// @brief  The exporter-test, will return true for successful import.
+    /// @return true for success, false for failure.
+    virtual bool exporterTest();
+};
+
+inline
+bool AbstractImportExportBase::importerTest() {
+    return true;
+}
+
+inline
+bool AbstractImportExportBase::exporterTest() {
+    return true;
+}
+
+#endif // AI_ABSTRACTIMPORTEXPORTBASE_H_INC

vendor/assimp/test/unit/AssimpAPITest.cpp

@@ -0,0 +1,71 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include <assimp/importerdesc.h>
+
+using namespace Assimp;
+
+class AssimpAPITest : public ::testing::Test {
+    // empty
+};
+
+TEST_F( AssimpAPITest, aiGetImporterDescTest ) {
+    const aiImporterDesc *desc( nullptr );
+    desc = aiGetImporterDesc(nullptr);
+    EXPECT_EQ(nullptr, desc);
+
+    desc = aiGetImporterDesc( "obj" );
+    EXPECT_TRUE(nullptr != desc);
+}
+
+TEST_F( AssimpAPITest, aiGetLastErrorTest ) {
+    const char *error = aiGetErrorString();
+    EXPECT_NE(nullptr, error);
+}
+
+TEST_F(AssimpAPITest, aiImportFileFromMemoryTest) {
+    const aiScene *scene_null_buffer = aiImportFileFromMemory(nullptr, 0u, 0u, nullptr);
+    EXPECT_EQ(nullptr, scene_null_buffer);
+
+    char buffer[1024] = {'\0'};
+    const aiScene *scene_null_size = aiImportFileFromMemory(buffer, 0u, 0u, nullptr);
+    EXPECT_EQ(nullptr, scene_null_size);
+}

vendor/assimp/test/unit/AssimpAPITest_aiMatrix3x3.cpp

@@ -0,0 +1,174 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "MathTest.h"
+#include <array>
+
+using namespace Assimp;
+
+class AssimpAPITest_aiMatrix3x3 : public AssimpMathTest {
+protected:
+    void SetUp() override {
+        result_c = result_cpp = aiMatrix3x3();
+    }
+
+    aiMatrix3x3 result_c, result_cpp;
+};
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiIdentityMatrix3Test) {
+    // Force a non-identity matrix.
+    result_c = aiMatrix3x3(0,0,0,0,0,0,0,0,0);
+    aiIdentityMatrix3(&result_c);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3FromMatrix4Test) {
+    const auto m = random_mat4();
+    result_cpp = aiMatrix3x3(m);
+    aiMatrix3FromMatrix4(&result_c, &m);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3FromQuaternionTest) {
+    const auto q = random_quat();
+    result_cpp = q.GetMatrix();
+    aiMatrix3FromQuaternion(&result_c, &q);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3AreEqualTest) {
+    result_c = result_cpp = random_mat3();
+    EXPECT_EQ(result_cpp == result_c,
+        (bool)aiMatrix3AreEqual(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3AreEqualEpsilonTest) {
+    result_c = result_cpp = random_mat3();
+    EXPECT_EQ(result_cpp.Equal(result_c, Epsilon),
+        (bool)aiMatrix3AreEqualEpsilon(&result_cpp, &result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMultiplyMatrix3Test) {
+    const auto m = random_mat3();
+    result_c = result_cpp = random_mat3();
+    result_cpp *= m;
+    aiMultiplyMatrix3(&result_c, &m);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiTransposeMatrix3Test) {
+    result_c = result_cpp = random_mat3();
+    result_cpp.Transpose();
+    aiTransposeMatrix3(&result_c);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3InverseTest) {
+    // Use a predetermined matrix to prevent arbitrary
+    // cases where it could have a null determinant.
+    result_c = result_cpp = aiMatrix3x3(
+        5, 2, 7,
+        4, 6, 9,
+        1, 8, 3);
+    result_cpp.Inverse();
+    aiMatrix3Inverse(&result_c);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+inline void AI_EXPECT_REAL_EQ(ai_real val1, ai_real val2) {
+#ifdef ASSIMP_DOUBLE_PRECISION
+    EXPECT_DOUBLE_EQ((val1), (val2));
+#else
+    EXPECT_FLOAT_EQ((val1), (val2));
+#endif
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3DeterminantTest) {
+    result_c = result_cpp = random_mat3();
+    const ai_real det_1 = result_cpp.Determinant();
+    const ai_real det_2 = aiMatrix3Determinant(&result_c);
+    AI_EXPECT_REAL_EQ(det_1, det_2);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3RotationZTest) {
+    const float angle(RandPI.next());
+    aiMatrix3x3::RotationZ(angle, result_cpp);
+    aiMatrix3RotationZ(&result_c, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3FromRotationAroundAxisTest) {
+    const float angle(RandPI.next());
+    const auto axis = random_unit_vec3();
+    aiMatrix3x3::Rotation(angle, axis, result_cpp);
+    aiMatrix3FromRotationAroundAxis(&result_c, &axis, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3TranslationTest) {
+    const auto axis = random_vec2();
+    aiMatrix3x3::Translation(axis, result_cpp);
+    aiMatrix3Translation(&result_c, &axis);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, aiMatrix3FromToTest) {
+    // Use predetermined vectors to prevent running into division by zero.
+    const auto from = aiVector3D(1,2,1).Normalize(), to = aiVector3D(-1,1,1).Normalize();
+    aiMatrix3x3::FromToMatrix(from, to, result_cpp);
+    aiMatrix3FromTo(&result_c, &from, &to);
+    EXPECT_TRUE(result_cpp.Equal(result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiMatrix3x3, operatorTest) {
+    std::array<ai_real, 9> value = { 1, 2, 3, 4, 5, 6, 7, 8,9};
+    result_cpp = aiMatrix3x3( value[0], value[1], value[2], value[3],
+                              value[4], value[5], value[6], value[7],
+                              value[8]);
+    size_t idx=0;
+    for (unsigned int i = 0; i < 3; ++i) {
+       for (unsigned int j = 0; j < 3; ++j) {
+            ai_real curValue = result_cpp[i][j];
+            EXPECT_EQ(curValue, value[idx]);
+            idx++;
+       }
+    }
+}

vendor/assimp/test/unit/AssimpAPITest_aiMatrix4x4.cpp

@@ -0,0 +1,282 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "MathTest.h"
+#include <assimp/MathFunctions.h>
+#include <array>
+
+using namespace Assimp;
+
+class AssimpAPITest_aiMatrix4x4 : public AssimpMathTest {
+protected:
+    void SetUp() override {
+        result_c = result_cpp = aiMatrix4x4();
+    }
+
+    /* Generates a predetermined transformation matrix to use
+       for the aiDecompose functions to prevent running into
+       division by zero. */
+    aiMatrix4x4 get_predetermined_transformation_matrix_for_decomposition() const {
+        aiMatrix4x4 t, r;
+        aiMatrix4x4::Translation(aiVector3D(14,-25,-8), t);
+        aiMatrix4x4::Rotation(Math::aiPi<float>() / 4.0f, aiVector3D(1).Normalize(), r);
+        return t * r;
+    }
+
+    aiMatrix4x4 result_c, result_cpp;
+};
+
+TEST_F(AssimpAPITest_aiMatrix4x4, isIdendityTest) {
+    aiMatrix4x4 m = aiMatrix4x4(1 + Math::getEpsilon<ai_real>(), 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
+    const bool result = m.IsIdentity(Math::getEpsilon<ai_real>());
+    EXPECT_TRUE(result);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiIdentityMatrix4Test) {
+    // Force a non-identity matrix.
+    result_c = aiMatrix4x4(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0);
+    aiIdentityMatrix4(&result_c);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4FromMatrix3Test) {
+    aiMatrix3x3 m = random_mat3();
+    result_cpp = aiMatrix4x4(m);
+    aiMatrix4FromMatrix3(&result_c, &m);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4FromScalingQuaternionPositionTest) {
+    const aiVector3D s = random_vec3();
+    const aiQuaternion q = random_quat();
+    const aiVector3D t = random_vec3();
+    result_cpp = aiMatrix4x4(s, q, t);
+    aiMatrix4FromScalingQuaternionPosition(&result_c, &s, &q, &t);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4AddTest) {
+    const aiMatrix4x4 temp = random_mat4();
+    result_c = result_cpp = random_mat4();
+    result_cpp = result_cpp + temp;
+    aiMatrix4Add(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4AreEqualTest) {
+    result_c = result_cpp = random_mat4();
+    EXPECT_EQ(result_cpp == result_c,
+        (bool)aiMatrix4AreEqual(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4AreEqualEpsilonTest) {
+    result_c = result_cpp = random_mat4();
+    EXPECT_EQ(result_cpp.Equal(result_c, Epsilon),
+        (bool)aiMatrix4AreEqualEpsilon(&result_cpp, &result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMultiplyMatrix4Test) {
+    const auto m = random_mat4();
+    result_c = result_cpp = random_mat4();
+    result_cpp *= m;
+    aiMultiplyMatrix4(&result_c, &m);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiTransposeMatrix4Test) {
+    result_c = result_cpp = random_mat4();
+    result_cpp.Transpose();
+    aiTransposeMatrix4(&result_c);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4InverseTest) {
+    // Use a predetermined matrix to prevent arbitrary
+    // cases where it could have a null determinant.
+    result_c = result_cpp = aiMatrix4x4(
+        6, 10, 15, 3,
+        14, 2, 12, 8,
+        9, 13, 5, 16,
+        4, 7, 11, 1);
+    result_cpp.Inverse();
+    aiMatrix4Inverse(&result_c);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4DeterminantTest) {
+    result_c = result_cpp = random_mat4();
+    EXPECT_EQ(result_cpp.Determinant(),
+        aiMatrix4Determinant(&result_c));
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4IsIdentityTest) {
+    EXPECT_EQ(result_cpp.IsIdentity(),
+        (bool)aiMatrix4IsIdentity(&result_c));
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiDecomposeMatrixTest) {
+    aiVector3D scaling_c, scaling_cpp,
+        position_c, position_cpp;
+    aiQuaternion rotation_c, rotation_cpp;
+
+    result_c = result_cpp = get_predetermined_transformation_matrix_for_decomposition();
+    result_cpp.Decompose(scaling_cpp, rotation_cpp, position_cpp);
+    aiDecomposeMatrix(&result_c, &scaling_c, &rotation_c, &position_c);
+    EXPECT_EQ(scaling_cpp, scaling_c);
+    EXPECT_EQ(position_cpp, position_c);
+    EXPECT_EQ(rotation_cpp, rotation_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4DecomposeIntoScalingEulerAnglesPositionTest) {
+    aiVector3D scaling_c, scaling_cpp,
+        rotation_c, rotation_cpp,
+        position_c, position_cpp;
+
+    result_c = result_cpp = get_predetermined_transformation_matrix_for_decomposition();
+    result_cpp.Decompose(scaling_cpp, rotation_cpp, position_cpp);
+    aiMatrix4DecomposeIntoScalingEulerAnglesPosition(&result_c, &scaling_c, &rotation_c, &position_c);
+    EXPECT_EQ(scaling_cpp, scaling_c);
+    EXPECT_EQ(position_cpp, position_c);
+    EXPECT_EQ(rotation_cpp, rotation_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4DecomposeIntoScalingAxisAnglePositionTest) {
+    aiVector3D scaling_c, scaling_cpp,
+        axis_c, axis_cpp,
+        position_c, position_cpp;
+    ai_real angle_c, angle_cpp;
+
+    result_c = result_cpp = get_predetermined_transformation_matrix_for_decomposition();
+    result_cpp.Decompose(scaling_cpp, axis_cpp, angle_cpp, position_cpp);
+    aiMatrix4DecomposeIntoScalingAxisAnglePosition(&result_c, &scaling_c, &axis_c, &angle_c, &position_c);
+    EXPECT_EQ(scaling_cpp, scaling_c);
+    EXPECT_EQ(axis_cpp, axis_c);
+    EXPECT_EQ(angle_cpp, angle_c);
+    EXPECT_EQ(position_cpp, position_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4DecomposeNoScalingTest) {
+    aiVector3D position_c, position_cpp;
+    aiQuaternion rotation_c, rotation_cpp;
+
+    result_c = result_cpp = get_predetermined_transformation_matrix_for_decomposition();
+    result_cpp.DecomposeNoScaling(rotation_cpp, position_cpp);
+    aiMatrix4DecomposeNoScaling(&result_c, &rotation_c, &position_c);
+    EXPECT_EQ(position_cpp, position_c);
+    EXPECT_EQ(rotation_cpp, rotation_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4FromEulerAnglesTest) {
+    const float x(RandPI.next()),
+        y(RandPI.next()),
+        z(RandPI.next());
+    result_cpp.FromEulerAnglesXYZ(x, y, z);
+    aiMatrix4FromEulerAngles(&result_c, x, y, z);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4RotationXTest) {
+    const float angle(RandPI.next());
+    aiMatrix4x4::RotationX(angle, result_cpp);
+    aiMatrix4RotationX(&result_c, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4RotationYTest) {
+    const float angle(RandPI.next());
+    aiMatrix4x4::RotationY(angle, result_cpp);
+    aiMatrix4RotationY(&result_c, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4RotationZTest) {
+    const float angle(RandPI.next());
+    aiMatrix4x4::RotationZ(angle, result_cpp);
+    aiMatrix4RotationZ(&result_c, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4FromRotationAroundAxisTest) {
+    const float angle(RandPI.next());
+    const auto axis = random_unit_vec3();
+    aiMatrix4x4::Rotation(angle, axis, result_cpp);
+    aiMatrix4FromRotationAroundAxis(&result_c, &axis, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4TranslationTest) {
+    const auto axis = random_vec3();
+    aiMatrix4x4::Translation(axis, result_cpp);
+    aiMatrix4Translation(&result_c, &axis);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4ScalingTest) {
+    const auto scaling = random_vec3();
+    aiMatrix4x4::Scaling(scaling, result_cpp);
+    aiMatrix4Scaling(&result_c, &scaling);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, aiMatrix4FromToTest) {
+    // Use predetermined vectors to prevent running into division by zero.
+    const auto from = aiVector3D(1,2,1).Normalize(), to = aiVector3D(-1,1,1).Normalize();
+    aiMatrix4x4::FromToMatrix(from, to, result_cpp);
+    aiMatrix4FromTo(&result_c, &from, &to);
+    EXPECT_TRUE(result_cpp.Equal(result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiMatrix4x4, operatorTest) {
+    std::array<ai_real, 16> value = { 1, 2, 3, 4, 5, 6, 7, 8,
+                        9, 10, 11, 12, 13, 14, 15, 16 };
+    result_cpp = aiMatrix4x4( value[0], value[1], value[2], value[3],
+                              value[4], value[5], value[6], value[7],
+                              value[8], value[9], value[10], value[11],
+                              value[12], value[13], value[14], value[15] );
+    size_t idx=0;
+    for (unsigned int i = 0; i < 4; ++i) {
+       for (unsigned int j = 0; j < 4; ++j) {
+            ai_real curValue = result_cpp[i][j];
+            EXPECT_EQ(curValue, value[idx]);
+            idx++;
+       }
+    }
+}

vendor/assimp/test/unit/AssimpAPITest_aiQuaternion.cpp

@@ -0,0 +1,146 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "MathTest.h"
+
+using namespace Assimp;
+
+class AssimpAPITest_aiQuaternion : public AssimpMathTest {
+protected:
+    virtual void SetUp() {
+        result_c = result_cpp = aiQuaternion();
+    }
+
+    aiQuaternion result_c, result_cpp;
+};
+
+TEST_F(AssimpAPITest_aiQuaternion, aiCreateQuaternionFromMatrixTest) {
+    // Use a predetermined transformation matrix
+    // to prevent running into division by zero.
+    aiMatrix3x3 m, r;
+    aiMatrix3x3::Translation(aiVector2D(14,-25), m);
+    aiMatrix3x3::RotationZ(Math::aiPi<float>() / 4.0f, r);
+    m = m * r;
+
+    result_cpp = aiQuaternion(m);
+    aiCreateQuaternionFromMatrix(&result_c, &m);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionFromEulerAnglesTest) {
+    const float x(RandPI.next()),
+        y(RandPI.next()),
+        z(RandPI.next());
+    result_cpp = aiQuaternion(x, y, z);
+    aiQuaternionFromEulerAngles(&result_c, x, y, z);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionFromAxisAngleTest) {
+    const float angle(RandPI.next());
+    const aiVector3D axis(random_unit_vec3());
+    result_cpp = aiQuaternion(axis, angle);
+    aiQuaternionFromAxisAngle(&result_c, &axis, angle);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionFromNormalizedQuaternionTest) {
+    const auto qvec3 = random_unit_vec3();
+    result_cpp = aiQuaternion(qvec3);
+    aiQuaternionFromNormalizedQuaternion(&result_c, &qvec3);
+    // Use a larger tolerance because FMA contraction differences in
+    // 1.0 - x*x - y*y - z*z can flip the sign of a near-zero residual,
+    // causing w = 0 vs w = sqrt(tiny) ≈ 1e-4.
+    EXPECT_TRUE(result_cpp.Equal(result_c, 1e-4f));
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionAreEqualTest) {
+    result_c = result_cpp = random_quat();
+    EXPECT_EQ(result_cpp == result_c,
+        (bool)aiQuaternionAreEqual(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionAreEqualEpsilonTest) {
+    result_c = result_cpp = random_quat();
+    EXPECT_EQ(result_cpp.Equal(result_c, Epsilon),
+        (bool)aiQuaternionAreEqualEpsilon(&result_cpp, &result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionNormalizeTest) {
+    result_c = result_cpp = random_quat();
+    aiQuaternionNormalize(&result_c);
+    EXPECT_EQ(result_cpp.Normalize(), result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionConjugateTest) {
+    result_c = result_cpp = random_quat();
+    aiQuaternionConjugate(&result_c);
+    EXPECT_EQ(result_cpp.Conjugate(), result_c);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionMultiplyTest) {
+    const aiQuaternion temp = random_quat();
+    result_c = result_cpp = random_quat();
+    result_cpp = result_cpp * temp;
+    aiQuaternionMultiply(&result_c, &temp);
+
+    EXPECT_FLOAT_EQ(result_cpp.x, result_c.x);
+    EXPECT_FLOAT_EQ(result_cpp.y, result_c.y);
+    EXPECT_FLOAT_EQ(result_cpp.z, result_c.z);
+    EXPECT_FLOAT_EQ(result_cpp.w, result_c.w);
+}
+
+TEST_F(AssimpAPITest_aiQuaternion, aiQuaternionInterpolateTest) {
+    // Use predetermined quaternions to prevent division by zero
+    // during slerp calculations.
+    const float INTERPOLATION(0.5f);
+    const auto q1 = aiQuaternion(aiVector3D(-1,1,1).Normalize(), Math::aiPi<float>() / 4.0f);
+    const auto q2 = aiQuaternion(aiVector3D(1,2,1).Normalize(), Math::aiPi<float>() / 2.0f);
+    aiQuaternion::Interpolate(result_cpp, q1, q2, INTERPOLATION);
+    aiQuaternionInterpolate(&result_c, &q1, &q2, INTERPOLATION);
+
+    EXPECT_FLOAT_EQ(result_cpp.x, result_c.x);
+    EXPECT_FLOAT_EQ(result_cpp.y, result_c.y);
+    EXPECT_FLOAT_EQ(result_cpp.z, result_c.z);
+    EXPECT_FLOAT_EQ(result_cpp.w, result_c.w);
+}

vendor/assimp/test/unit/AssimpAPITest_aiVector2D.cpp

@@ -0,0 +1,140 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "MathTest.h"
+
+using namespace Assimp;
+
+class AssimpAPITest_aiVector2D : public AssimpMathTest {
+protected:
+    virtual void SetUp() {
+        result_c = result_cpp = aiVector2D();
+        temp = random_vec2(); // Generates a random 2D vector != null vector.
+    }
+
+    aiVector2D result_c, result_cpp, temp;
+};
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2AreEqualTest) {
+    result_c = result_cpp = random_vec2();
+    EXPECT_EQ(result_cpp == result_c,
+        (bool)aiVector2AreEqual(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2AreEqualEpsilonTest) {
+    result_c = result_cpp = random_vec2();
+    EXPECT_EQ(result_cpp.Equal(result_c, Epsilon),
+        (bool)aiVector2AreEqualEpsilon(&result_cpp, &result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2AddTest) {
+    result_c = result_cpp = random_vec2();
+    result_cpp += temp;
+    aiVector2Add(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2SubtractTest) {
+    result_c = result_cpp = random_vec2();
+    result_cpp -= temp;
+    aiVector2Subtract(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2ScaleTest) {
+    const float FACTOR = RandNonZero.next();
+    result_c = result_cpp = random_vec2();
+    result_cpp *= FACTOR;
+    aiVector2Scale(&result_c, FACTOR);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2SymMulTest) {
+    result_c = result_cpp = random_vec2();
+    result_cpp = result_cpp.SymMul(temp);
+    aiVector2SymMul(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2DivideByScalarTest) {
+    const float DIVISOR = RandNonZero.next();
+    result_c = result_cpp = random_vec2();
+    result_cpp /= DIVISOR;
+    aiVector2DivideByScalar(&result_c, DIVISOR);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2DivideByVectorTest) {
+    result_c = result_cpp = random_vec2();
+    result_cpp = result_cpp / temp;
+    aiVector2DivideByVector(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2LengthTest) {
+    result_c = result_cpp = random_vec2();
+    EXPECT_EQ(result_cpp.Length(), aiVector2Length(&result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2SquareLengthTest) {
+    result_c = result_cpp = random_vec2();
+    EXPECT_EQ(result_cpp.SquareLength(), aiVector2SquareLength(&result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2NegateTest) {
+    result_c = result_cpp = random_vec2();
+    aiVector2Negate(&result_c);
+    EXPECT_EQ(-result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2DotProductTest) {
+    result_c = result_cpp = random_vec2();
+    EXPECT_EQ(result_cpp * result_c,
+        aiVector2DotProduct(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector2D, aiVector2NormalizeTest) {
+    result_c = result_cpp = random_vec2();
+    aiVector2Normalize(&result_c);
+    EXPECT_EQ(result_cpp.Normalize(), result_c);
+}

vendor/assimp/test/unit/AssimpAPITest_aiVector3D.cpp

@@ -0,0 +1,185 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "MathTest.h"
+
+using namespace Assimp;
+
+class AssimpAPITest_aiVector3D : public AssimpMathTest {
+protected:
+    virtual void SetUp() {
+        result_c = result_cpp = aiVector3D();
+        temp = random_vec3(); // Generates a random 3D vector != null vector.
+    }
+
+    aiVector3D result_c, result_cpp, temp;
+};
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3AreEqualTest) {
+    result_c = result_cpp = random_vec3();
+    EXPECT_EQ(result_cpp == result_c,
+        (bool)aiVector3AreEqual(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3AreEqualEpsilonTest) {
+    result_c = result_cpp = random_vec3();
+    EXPECT_EQ(result_cpp.Equal(result_c, Epsilon),
+        (bool)aiVector3AreEqualEpsilon(&result_cpp, &result_c, Epsilon));
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3LessThanTest) {
+    result_c = result_cpp = random_vec3();
+    EXPECT_EQ(result_cpp < temp,
+        (bool)aiVector3LessThan(&result_c, &temp));
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3AddTest) {
+    result_c = result_cpp = random_vec3();
+    result_cpp += temp;
+    aiVector3Add(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3SubtractTest) {
+    result_c = result_cpp = random_vec3();
+    result_cpp -= temp;
+    aiVector3Subtract(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3ScaleTest) {
+    const float FACTOR = RandNonZero.next();
+    result_c = result_cpp = random_vec3();
+    result_cpp *= FACTOR;
+    aiVector3Scale(&result_c, FACTOR);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3SymMulTest) {
+    result_c = result_cpp = random_vec3();
+    result_cpp = result_cpp.SymMul(temp);
+    aiVector3SymMul(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3DivideByScalarTest) {
+    const float DIVISOR = RandNonZero.next();
+    result_c = result_cpp = random_vec3();
+    result_cpp /= DIVISOR;
+    aiVector3DivideByScalar(&result_c, DIVISOR);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3DivideByVectorTest) {
+    result_c = result_cpp = random_vec3();
+    result_cpp = result_cpp / temp;
+    aiVector3DivideByVector(&result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3LengthTest) {
+    result_c = result_cpp = random_vec3();
+    EXPECT_EQ(result_cpp.Length(), aiVector3Length(&result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3SquareLengthTest) {
+    result_c = result_cpp = random_vec3();
+    EXPECT_EQ(result_cpp.SquareLength(), aiVector3SquareLength(&result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3NegateTest) {
+    result_c = result_cpp = random_vec3();
+    aiVector3Negate(&result_c);
+    EXPECT_EQ(-result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3DotProductTest) {
+    result_c = result_cpp = random_vec3();
+    EXPECT_EQ(result_cpp * result_c,
+        aiVector3DotProduct(&result_cpp, &result_c));
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3CrossProductTest) {
+    result_c = result_cpp = random_vec3();
+    result_cpp = result_cpp ^ temp;
+    aiVector3CrossProduct(&result_c, &result_c, &temp);
+    EXPECT_EQ(result_cpp, result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3NormalizeTest) {
+    result_c = result_cpp = random_vec3();
+    aiVector3Normalize(&result_c);
+    EXPECT_EQ(result_cpp.Normalize(), result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3NormalizeSafeTest) {
+    result_c = result_cpp = random_vec3();
+    aiVector3NormalizeSafe(&result_c);
+    EXPECT_EQ(result_cpp.NormalizeSafe(), result_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiVector3RotateByQuaternionTest) {
+    aiVector3D v_c, v_cpp;
+    v_c = v_cpp = random_vec3();
+    const auto q = random_quat();
+    aiVector3RotateByQuaternion(&v_c, &q);
+    EXPECT_EQ(q.Rotate(v_cpp), v_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiTransformVecByMatrix3Test) {
+    const auto m = random_mat3();
+    aiVector3D v_c, v_cpp;
+    v_c = v_cpp = random_vec3();
+    v_cpp *= m;
+    aiTransformVecByMatrix3(&v_c, &m);
+    EXPECT_EQ(v_cpp, v_c);
+}
+
+TEST_F(AssimpAPITest_aiVector3D, aiTransformVecByMatrix4Test) {
+    const auto m = random_mat4();
+    aiVector3D v_c, v_cpp;
+    v_c = v_cpp = random_vec3();
+    v_cpp *= m;
+    aiTransformVecByMatrix4(&v_c, &m);
+    EXPECT_EQ(v_cpp, v_c);
+}

vendor/assimp/test/unit/CCompilerTest.c

@@ -0,0 +1,9 @@
+
+/* This is just a small test to check whether Assimp's API compiles from C */
+
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/version.h>
+#include <assimp/config.h>
+#include <assimp/cimport.h>
+#include <assimp/cexport.h>

vendor/assimp/test/unit/Common/uiScene.cpp

@@ -0,0 +1,109 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/scene.h>
+#include <assimp/SceneCombiner.h>
+
+using namespace Assimp;
+
+class utScene : public ::testing::Test {
+protected:
+	aiScene *scene;
+
+    void SetUp() override {
+		scene = new aiScene;
+    }
+
+    void TearDown() override {
+		delete scene;
+		scene = nullptr;
+    }
+};
+
+TEST_F(utScene, findNodeTest) {
+	scene->mRootNode = new aiNode();
+	scene->mRootNode->mName.Set("test");
+	aiNode *child = new aiNode;
+	child->mName.Set("child");
+	scene->mRootNode->addChildren(1, &child);
+	aiNode *found = scene->mRootNode->FindNode("child");
+	EXPECT_EQ(child, found);
+}
+
+TEST_F(utScene, sceneHasContentTest) {
+    EXPECT_FALSE(scene->HasAnimations());
+	EXPECT_FALSE(scene->HasMaterials());
+	EXPECT_FALSE(scene->HasMeshes());
+	EXPECT_FALSE(scene->HasCameras());
+	EXPECT_FALSE(scene->HasLights());
+	EXPECT_FALSE(scene->HasTextures());
+}
+
+TEST_F(utScene, getShortFilenameTest) {
+	std::string long_filename1 = "foo_bar/name";
+    const char *name1 = scene->GetShortFilename(long_filename1.c_str());
+	EXPECT_NE(nullptr, name1);
+
+    std::string long_filename2 = "foo_bar\\name";
+    const char *name2 = scene->GetShortFilename(long_filename2.c_str());
+	EXPECT_NE(nullptr, name2);
+}
+
+TEST_F(utScene, deepCopyTest) {
+    scene->mRootNode = new aiNode();
+
+    scene->mNumMeshes = 1;
+    scene->mMeshes = new aiMesh *[scene->mNumMeshes] ();
+    scene->mMeshes[0] = new aiMesh ();
+
+    scene->mMeshes[0]->SetTextureCoordsName (0, aiString ("test"));
+
+    {
+        aiScene* copied = nullptr;
+        SceneCombiner::CopyScene(&copied,scene);
+        delete copied;
+    }
+}
+
+TEST_F(utScene, getEmbeddedTextureTest) {
+}

vendor/assimp/test/unit/Common/utAssertHandler.cpp

@@ -0,0 +1,110 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+/// Ensure this test has asserts on, even if the build type doesn't have asserts by default.
+#if !defined(ASSIMP_BUILD_DEBUG)
+#define ASSIMP_BUILD_DEBUG
+#endif
+
+#include <assimp/ai_assert.h>
+#include <assimp/AssertHandler.h>
+
+namespace
+{
+    /// An exception which is thrown by the testAssertHandler
+    struct TestAssertException
+    {
+        TestAssertException(const char* failedExpression, const char* file, int line)
+            : m_failedExpression(failedExpression)
+            , m_file(file)
+            , m_line(line)
+        {
+        }
+
+        std::string m_failedExpression;
+        std::string m_file;
+        int m_line;
+    };
+
+    /// Swap the default handler, which aborts, by one which throws.
+    void testAssertHandler(const char* failedExpression, const char* file, int line)
+    {
+        throw TestAssertException(failedExpression, file, line);
+    }
+
+    /// Ensure that the default assert handler is restored after the test is finished.
+    struct ReplaceHandlerScope
+    {
+        ReplaceHandlerScope()
+        {
+            Assimp::setAiAssertHandler(testAssertHandler);
+        }
+
+        ~ReplaceHandlerScope()
+        {
+            Assimp::setAiAssertHandler(Assimp::defaultAiAssertHandler);
+        }
+    };
+}
+
+TEST(utAssertHandler, replaceWithThrow)
+{
+    ReplaceHandlerScope scope;
+
+    try
+    {
+        ai_assert((2 + 2 == 5) && "Sometimes people put messages here");
+        EXPECT_TRUE(false);
+    }
+    catch(const TestAssertException& e)
+    {
+        EXPECT_STREQ(e.m_failedExpression.c_str(), "(2 + 2 == 5) && \"Sometimes people put messages here\"");
+        EXPECT_STREQ(e.m_file.c_str(), __FILE__);
+        EXPECT_GT(e.m_line, 0);
+        EXPECT_LT(e.m_line, __LINE__);
+    }
+    catch(...)
+    {
+        EXPECT_TRUE(false);
+    }
+}

vendor/assimp/test/unit/Common/utBase64.cpp

@@ -0,0 +1,81 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include "TestIOSystem.h"
+
+#include <assimp/Base64.hpp>
+
+using namespace std;
+using namespace Assimp;
+
+class Base64Test : public ::testing::Test {};
+
+static const std::vector<uint8_t> assimpStringBinary = { 97, 115, 115, 105, 109, 112 };
+static const std::string assimpStringEncoded = "YXNzaW1w";
+
+TEST_F( Base64Test, encodeTest) {
+    EXPECT_EQ( "", Base64::Encode(std::vector<uint8_t>{}) );
+    EXPECT_EQ( "Vg==", Base64::Encode(std::vector<uint8_t>{ 86 }) );
+    EXPECT_EQ( assimpStringEncoded, Base64::Encode(assimpStringBinary) );
+}
+
+TEST_F( Base64Test, encodeTestWithNullptr ) {
+    std::string out;
+    Base64::Encode(nullptr, 100u, out);
+    EXPECT_TRUE(out.empty());
+
+    Base64::Encode(&assimpStringBinary[0], 0u, out);
+    EXPECT_TRUE(out.empty());
+}
+
+TEST_F( Base64Test, decodeTest) {
+    EXPECT_EQ( std::vector<uint8_t> {}, Base64::Decode("") );
+    EXPECT_EQ( std::vector<uint8_t> { 86 }, Base64::Decode("Vg==") );
+    EXPECT_EQ( assimpStringBinary, Base64::Decode(assimpStringEncoded) );
+}
+
+TEST_F(Base64Test, decodeTestWithNullptr) {
+    uint8_t *out = nullptr;
+    size_t size = Base64::Decode(nullptr, 100u, out);
+    EXPECT_EQ(nullptr, out);
+    EXPECT_EQ(0u, size);
+}

vendor/assimp/test/unit/Common/utBaseProcess.cpp

@@ -0,0 +1,110 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "TestIOSystem.h"
+#include "UnitTestPCH.h"
+
+#include "Common/BaseProcess.h"
+#include <assimp/AssertHandler.h>
+
+using namespace Assimp;
+
+class BaseProcessTest : public ::testing::Test {
+public:
+    static void test_handler( const char*, const char*, int ) {
+        HandlerWasCalled = true;
+    }
+
+    void SetUp() override {
+        HandlerWasCalled = false;
+        setAiAssertHandler(test_handler);
+    }
+
+    void TearDown() override {
+        setAiAssertHandler(nullptr);
+    }
+
+    static bool handlerWasCalled() {
+        return HandlerWasCalled;
+    }
+
+private:
+    static bool HandlerWasCalled;
+};
+
+bool BaseProcessTest::HandlerWasCalled = false;
+
+class TestingBaseProcess : public BaseProcess {
+public:
+    TestingBaseProcess() : BaseProcess() {
+        // empty
+    }
+
+    ~TestingBaseProcess() override = default;
+
+    bool IsActive( unsigned int ) const override {
+        return true;
+    }
+
+    void Execute(aiScene*) override {
+
+    }
+};
+TEST_F( BaseProcessTest, constructTest ) {
+    bool ok = true;
+    try {
+        TestingBaseProcess process;
+    } catch (...) {
+        ok = false;
+    }
+    EXPECT_TRUE(ok);
+}
+
+TEST_F( BaseProcessTest, executeOnSceneTest ) {
+    TestingBaseProcess process;
+    process.ExecuteOnScene(nullptr);
+#ifdef ASSIMP_BUILD_DEBUG
+    EXPECT_TRUE(BaseProcessTest::handlerWasCalled());
+#else
+    EXPECT_FALSE(BaseProcessTest::handlerWasCalled());
+#endif
+
+}

vendor/assimp/test/unit/Common/utHash.cpp

@@ -0,0 +1,56 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/Hash.h>
+
+using namespace Assimp;
+
+class utHash : public ::testing::Test {
+    // empty
+};
+
+TEST_F( utHash, SuperFastHashTest ) {
+    const char *Data = "-21416115v";
+    auto result = SuperFastHash(Data, 10);
+    EXPECT_NE(0u, result);
+}

vendor/assimp/test/unit/Common/utLineSplitter.cpp

@@ -0,0 +1,67 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/LineSplitter.h>
+#include <assimp/DefaultIOSystem.h>
+#include <string>
+
+using namespace Assimp;
+
+class utLineSplitter : public ::testing::Test {};
+
+TEST_F(utLineSplitter, tokenizetest) {
+    DefaultIOSystem fs;
+    IOStream* file = fs.Open(ASSIMP_TEST_MODELS_DIR"/ParsingFiles/linesplitter_tokenizetest.txt", "rb");
+
+    StreamReaderLE stream(file);
+    LineSplitter myLineSplitter(stream);
+}
+
+TEST_F( utLineSplitter, issue212Test) {
+    DefaultIOSystem fs;
+    IOStream* file = fs.Open(ASSIMP_TEST_MODELS_DIR"/ParsingFiles/linesplitter_emptyline_test.txt", "rb");
+
+    StreamReaderLE stream(file);
+    LineSplitter myLineSplitter(stream);
+    myLineSplitter++;
+    EXPECT_THROW( myLineSplitter++, std::logic_error );
+}

vendor/assimp/test/unit/Common/utLogger.cpp

@@ -0,0 +1,52 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+class utLogger : public ::testing::Test {};
+
+TEST_F(utLogger, aiGetPredefinedLogStream_leak_test) {
+    aiLogStream stream1 = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT, nullptr);
+    aiLogStream stream2 = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT, nullptr);
+    ASSERT_EQ(stream1.callback, stream2.callback);
+}

vendor/assimp/test/unit/Common/utMaybe.cpp

@@ -0,0 +1,54 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include "Common/Maybe.h"
+
+using namespace Assimp;
+
+class utMaybe : public ::testing::Test {
+    // empty
+};
+
+TEST_F(utMaybe, creationTest) {
+    Maybe<int> first(1);
+    EXPECT_EQ(first.Get(), 1);
+}

vendor/assimp/test/unit/Common/utMesh.cpp

@@ -0,0 +1,97 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/mesh.h>
+
+using namespace Assimp;
+
+class utMesh : public ::testing::Test {
+protected:
+  aiMesh* mesh = nullptr;
+
+  void SetUp() override {
+    mesh = new aiMesh;
+  }
+
+  void TearDown() override {
+    delete mesh;
+    mesh = nullptr;
+  }
+};
+
+TEST_F(utMesh, emptyMeshHasNoContentTest) {
+  EXPECT_EQ(0u, mesh->mName.length);
+  EXPECT_FALSE(mesh->HasPositions());
+  EXPECT_FALSE(mesh->HasFaces());
+  EXPECT_FALSE(mesh->HasNormals());
+  EXPECT_FALSE(mesh->HasTangentsAndBitangents());
+  EXPECT_FALSE(mesh->HasVertexColors(0));
+  EXPECT_FALSE(mesh->HasVertexColors(AI_MAX_NUMBER_OF_COLOR_SETS));
+  EXPECT_FALSE(mesh->HasTextureCoords(0));
+  EXPECT_FALSE(mesh->HasTextureCoords(AI_MAX_NUMBER_OF_TEXTURECOORDS));
+  EXPECT_EQ(0u, mesh->GetNumUVChannels());
+  EXPECT_EQ(0u, mesh->GetNumColorChannels());
+  EXPECT_FALSE(mesh->HasBones());
+  EXPECT_FALSE(mesh->HasTextureCoordsName(0));
+  EXPECT_FALSE(mesh->HasTextureCoordsName(AI_MAX_NUMBER_OF_TEXTURECOORDS));
+}
+
+TEST_F(utMesh, setTextureCoordsName) {
+  EXPECT_FALSE(mesh->HasTextureCoordsName(0));
+  const aiString texcoords_name("texcoord_name");
+  mesh->SetTextureCoordsName(0, texcoords_name);
+  EXPECT_TRUE(mesh->HasTextureCoordsName(0u));
+  EXPECT_FALSE(mesh->HasTextureCoordsName(1u));
+  ASSERT_NE(nullptr, mesh->mTextureCoordsNames);
+  ASSERT_NE(nullptr, mesh->mTextureCoordsNames[0]);
+  EXPECT_STREQ(texcoords_name.C_Str(), mesh->mTextureCoordsNames[0]->C_Str());
+  EXPECT_STREQ(texcoords_name.C_Str(), mesh->GetTextureCoordsName(0)->C_Str());
+
+  // Now clear the name
+  mesh->SetTextureCoordsName(0, aiString());
+  EXPECT_FALSE(mesh->HasTextureCoordsName(0));
+  ASSERT_NE(nullptr, mesh->mTextureCoordsNames);
+  EXPECT_EQ(nullptr, mesh->mTextureCoordsNames[0]);
+  EXPECT_EQ(nullptr, mesh->GetTextureCoordsName(0));
+}
+

vendor/assimp/test/unit/Common/utParsingUtils.cpp

@@ -0,0 +1,66 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include <assimp/ParsingUtils.h>
+#include <assimp/fast_atof.h>
+#include <array>
+
+using namespace Assimp;
+
+class utParsingUtils : public ::testing::Test {};
+
+TEST_F(utParsingUtils, parseFloatsStringTest) {
+    const std::array<float, 16> floatArray = {
+        1.0f, 0.0f,         0.0f,        0.0f,
+        0.0f, 7.54979e-8f, -1.0f,        0.0f,
+        0.0f, 1.0f,         7.54979e-8f, 0.0f,
+        0.0f, 0.0f,         0.0f,        1.0f};
+    const std::string floatArrayAsStr = "1 0 0 0 0 7.54979e-8 -1 0 0 1 7.54979e-8 0 0 0 0 1";
+    const char *content = floatArrayAsStr.c_str();
+    const char *end = content + floatArrayAsStr.size();
+    for (float i : floatArray) {
+        float value = 0.0f;
+        SkipSpacesAndLineEnd(&content, end);
+        content = fast_atoreal_move(content, value);
+        EXPECT_FLOAT_EQ(value, i);
+    }
+}

vendor/assimp/test/unit/Common/utSpatialSort.cpp

@@ -0,0 +1,120 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/SpatialSort.h>
+
+using namespace Assimp;
+
+class utSpatialSort : public ::testing::Test {
+public
+        :
+    aiVector3D *vecs;
+
+protected:
+    void SetUp() override {
+        ::srand(static_cast<unsigned>(time(nullptr)));
+        vecs = new aiVector3D[100];
+        for (size_t i = 0; i < 100; ++i) {
+            vecs[i].x = static_cast<float>(rand()) / (static_cast<float>(RAND_MAX / 100));
+            vecs[i].y = static_cast<float>(rand()) / (static_cast<float>(RAND_MAX / 100));
+            vecs[i].z = static_cast<float>(rand()) / (static_cast<float>(RAND_MAX / 100));
+        }
+    }
+
+    void TearDown() override {
+        delete[] vecs;
+    }
+};
+
+TEST_F( utSpatialSort, findIdenticalsTest ) {
+    SpatialSort sSort;
+    sSort.Fill(vecs, 100, sizeof(aiVector3D));
+
+    std::vector<unsigned int> indices;
+    sSort.FindIdenticalPositions(vecs[0], indices);
+    EXPECT_EQ(1u, indices.size());
+}
+
+TEST_F(utSpatialSort, findPositionsTest) {
+    SpatialSort sSort;
+    sSort.Fill(vecs, 100, sizeof(aiVector3D));
+
+    std::vector<unsigned int> indices;
+    sSort.FindPositions(vecs[0], 0.01f, indices);
+    EXPECT_EQ(1u, indices.size());
+}
+
+TEST_F(utSpatialSort, highlyDisplacedPositionsTest) {
+    // Make a cube of positions, and then query it using the SpatialSort object.
+    constexpr unsigned int verticesPerAxis = 10;
+    constexpr ai_real step = 0.001f;
+    // Note the large constant offset here.
+    constexpr ai_real offset = 5000.0f - (0.5f * verticesPerAxis * step);
+    constexpr unsigned int totalNumPositions = verticesPerAxis * verticesPerAxis * verticesPerAxis;
+    aiVector3D* positions = new aiVector3D[totalNumPositions];
+    for (unsigned int x = 0; x < verticesPerAxis; ++x) {
+        for (unsigned int y = 0; y < verticesPerAxis; ++y) {
+            for (unsigned int z = 0; z < verticesPerAxis; ++z) {
+                const unsigned int index = (x * verticesPerAxis * verticesPerAxis) + (y * verticesPerAxis) + z;
+                positions[index] = aiVector3D(offset + (x * step), offset + (y * step), offset + (z * step));
+            }
+        }
+    }
+
+    SpatialSort sSort;
+    sSort.Fill(positions, totalNumPositions, sizeof(aiVector3D));
+
+    // Enough to find a point and its 6 immediate neighbors, but not any other point.
+    const ai_real epsilon = 1.1f * step;
+    std::vector<unsigned int> indices;
+    // Iterate through the _interior_ points of the cube.
+    for (unsigned int x = 1; x < verticesPerAxis - 1; ++x) {
+        for (unsigned int y = 1; y < verticesPerAxis - 1; ++y) {
+            for (unsigned int z = 1; z < verticesPerAxis - 1; ++z) {
+                const unsigned int index = (x * verticesPerAxis * verticesPerAxis) + (y * verticesPerAxis) + z;
+                sSort.FindPositions(positions[index], epsilon, indices);
+                ASSERT_EQ(7u, indices.size());
+            }
+        }
+    }
+    delete[] positions;
+}

vendor/assimp/test/unit/Common/utStandardShapes.cpp

@@ -0,0 +1,57 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+Copyright (c) 2006-2026, assimp team
+All rights reserved.
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+----------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include <assimp/mesh.h>
+#include <assimp/StandardShapes.h>
+
+using namespace Assimp;
+
+class utStandardShapes : public ::testing::Test {
+    // empty
+};
+
+TEST_F( utStandardShapes, testMakeMesh ) {
+    // Make sphere positions
+    std::vector<aiVector3D> positions;
+    Assimp::StandardShapes::MakeSphere(1, positions);
+
+    // Make mesh
+    const auto numIndicesPerPrimitive = 3u;
+    aiMesh *aiMeshPtr = Assimp::StandardShapes::MakeMesh(positions, numIndicesPerPrimitive);
+
+    // The mNumIndices member of the second face is now incorrect
+    const auto& face = aiMeshPtr->mFaces[0];
+    EXPECT_EQ(face.mNumIndices, numIndicesPerPrimitive);
+    delete aiMeshPtr;
+}
+

vendor/assimp/test/unit/Common/utXmlParser.cpp

@@ -0,0 +1,86 @@
+/*-------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-------------------------------------------------------------------------*/
+#include "UnitTestPCH.h"
+#include <assimp/XmlParser.h>
+#include <assimp/DefaultIOStream.h>
+#include <assimp/DefaultIOSystem.h>
+
+using namespace Assimp;
+
+class utXmlParser : public ::testing::Test {
+public:
+    utXmlParser() :
+            Test(),
+            mIoSystem() {
+        // empty
+    }
+
+protected:
+    DefaultIOSystem mIoSystem;
+};
+
+TEST_F(utXmlParser, parse_xml_test) {
+    XmlParser parser;
+    std::string filename = ASSIMP_TEST_MODELS_DIR "/X3D/ComputerKeyboard.x3d";
+    std::unique_ptr<IOStream> stream(mIoSystem.Open(filename.c_str(), "rb"));
+    EXPECT_NE(stream.get(), nullptr);
+    bool result = parser.parse(stream.get());
+    EXPECT_TRUE(result);
+}
+
+TEST_F(utXmlParser, parse_xml_and_traverse_test) {
+    XmlParser parser;
+    std::string filename = ASSIMP_TEST_MODELS_DIR "/X3D/ComputerKeyboard.x3d";
+    std::unique_ptr<IOStream> stream(mIoSystem.Open(filename.c_str(), "rb"));
+    EXPECT_NE(stream.get(), nullptr);
+    bool result = parser.parse(stream.get());
+    EXPECT_TRUE(result);
+    XmlNode root = parser.getRootNode();
+
+    XmlNodeIterator nodeIt(root, XmlNodeIterator::PreOrderMode);
+    const size_t numNodes = nodeIt.size();
+    bool empty = nodeIt.isEmpty();
+    EXPECT_FALSE(empty);
+    EXPECT_NE(numNodes, 0U);
+    XmlNode node;
+    while (nodeIt.getNext(node)) {
+        const std::string nodeName = node.name();
+        EXPECT_FALSE(nodeName.empty());
+    }
+}

vendor/assimp/test/unit/Geometry/utGeometryUtils.cpp

@@ -0,0 +1,68 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include "Geometry/GeometryUtils.h"
+
+using namespace Assimp;
+
+class utGeometryUtils : public ::testing::Test {
+protected:
+
+    void SetUp() override {
+    }
+
+    void TearDown() override {
+    }
+};
+static constexpr size_t NumVectors =  100;
+TEST_F(utGeometryUtils, normalizeVectorArrayTest) {
+    aiVector3D *inNormals = new aiVector3D[NumVectors];
+    for (uint32_t i=0; i<NumVectors; ++i){
+        inNormals[i].x = static_cast<ai_real>(i);
+        inNormals[i].y = static_cast<ai_real>(i);
+        inNormals[i].z = static_cast<ai_real>(i);
+    }
+    aiVector3D *outNormals = new aiVector3D[NumVectors];
+    GeometryUtils::normalizeVectorArray(inNormals, outNormals, NumVectors);
+    delete[] outNormals;
+    delete[] inNormals;
+}

vendor/assimp/test/unit/ImportExport/Assxml/utAssxmlImportExport.cpp

@@ -0,0 +1,76 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2019, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "SceneDiffer.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+#include <assimp/Exporter.hpp>
+
+using namespace Assimp;
+
+class utAssxmlImportExport : public AbstractImportExportBase {
+public:
+	bool importerTest() override {
+		return true;
+    }
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+	bool exporterTest() override {
+		Assimp::Importer importer;
+		const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/spider.obj", aiProcess_ValidateDataStructure);
+		EXPECT_NE(scene, nullptr );
+
+        ::Assimp::Exporter exporter;
+		return AI_SUCCESS == exporter.Export(scene, "assxml", ASSIMP_TEST_MODELS_DIR "/OBJ/spider_out.assxml");
+    }
+#endif
+};
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+TEST_F(utAssxmlImportExport, exportAssxmlTest) {
+	EXPECT_TRUE(exporterTest());
+}
+
+#endif

vendor/assimp/test/unit/ImportExport/IRR/utIrrImportExport.cpp

@@ -0,0 +1,70 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utIrrImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/IRR/box.irr", aiProcess_ValidateDataStructure);
+        // Only one box thus only one mesh
+        return nullptr != scene && scene->mNumMeshes == 1;
+    }
+};
+
+TEST_F(utIrrImportExport, importSimpleIrrTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utIrrImportExport, importSGIrrTest) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/IRR/dawfInCellar_SameHierarchy.irr", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+    EXPECT_EQ(scene->mNumMeshes, 2);
+    EXPECT_EQ(scene->mNumMaterials, 2);
+    EXPECT_GT(scene->mMeshes[0]->mNumVertices, 0);
+}

vendor/assimp/test/unit/ImportExport/MDL/MDLHL1TestFiles.h

@@ -0,0 +1,57 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @file MDLHL1TestFiles.h
+ *  @brief Definitions for Half-Life 1 MDL loader tests.
+ */
+
+#ifndef AI_MDLHL1TESTFILES_INCLUDED
+#define AI_MDLHL1TESTFILES_INCLUDED
+
+#ifndef ASSIMP_TEST_MDL_HL1_MODELS_DIR
+#define ASSIMP_TEST_MDL_HL1_MODELS_DIR ASSIMP_TEST_MODELS_DIR"/MDL/MDL (HL1)/"
+#endif
+
+#ifndef MDL_HL1_FILE_MAN
+#define MDL_HL1_FILE_MAN ASSIMP_TEST_MDL_HL1_MODELS_DIR "man.mdl"
+#endif
+
+#endif // AI_MDLHL1TESTFILES_INCLUDED

vendor/assimp/test/unit/ImportExport/MDL/utMDLImporter_HL1_ImportSettings.cpp

@@ -0,0 +1,228 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @file utMDLImporter_HL1_ImportSettings.cpp
+ *  @brief Half-Life 1 MDL loader import settings tests.
+ */
+
+#include "AbstractImportExportBase.h"
+#include "AssetLib/MDL/HalfLife/HL1ImportDefinitions.h"
+#include "MDLHL1TestFiles.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+#include <functional>
+#include <initializer_list>
+
+using namespace Assimp;
+
+class utMDLImporter_HL1_ImportSettings : public ::testing::Test {
+
+public:
+    // Test various import settings scenarios.
+
+    void importSettings() {
+
+        /* Verify that animations are *NOT* imported when
+           'Read animations' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATIONS,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_EQ(0u, scene->mNumAnimations);
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_INFOS));
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_GROUPS));
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_TRANSITION_GRAPH));
+
+                    expect_global_info_eq<int>(scene, { { 0, "NumSequences" },
+                                                              { 0, "NumTransitionNodes" } });
+                });
+
+        /* Verify that blend controllers info is *NOT* imported when
+           'Read blend controllers' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_BLEND_CONTROLLERS,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_NE(0u, scene->mNumAnimations);
+
+                    const aiNode *sequence_infos = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_INFOS);
+                    EXPECT_NE(nullptr, sequence_infos);
+
+                    for (unsigned int i = 0; i < sequence_infos->mNumChildren; ++i)
+                        EXPECT_EQ(nullptr, sequence_infos->mChildren[i]->FindNode(AI_MDL_HL1_NODE_BLEND_CONTROLLERS));
+
+                    expect_global_info_eq(scene, 0, "NumBlendControllers");
+                });
+
+        /* Verify that animation events are *NOT* imported when
+           'Read animation events' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_ANIMATION_EVENTS,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_NE(0u, scene->mNumAnimations);
+
+                    const aiNode *sequence_infos = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_INFOS);
+                    EXPECT_NE(nullptr, sequence_infos);
+
+                    for (unsigned int i = 0; i < sequence_infos->mNumChildren; ++i)
+                        EXPECT_EQ(nullptr, sequence_infos->mChildren[i]->FindNode(AI_MDL_HL1_NODE_ANIMATION_EVENTS));
+                });
+
+        /* Verify that sequence transitions info is read when
+           'Read sequence transitions' is enabled. */
+        load_with_import_setting_bool(
+                ASSIMP_TEST_MDL_HL1_MODELS_DIR "sequence_transitions.mdl",
+                AI_CONFIG_IMPORT_MDL_HL1_READ_SEQUENCE_TRANSITIONS,
+                true, // Set config value to true.
+                [&](const aiScene *scene) {
+                    EXPECT_NE(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_TRANSITION_GRAPH));
+                    expect_global_info_eq(scene, 4, "NumTransitionNodes");
+                });
+
+        /* Verify that sequence transitions info is *NOT* read when
+           'Read sequence transitions' is disabled. */
+        load_with_import_setting_bool(
+                ASSIMP_TEST_MDL_HL1_MODELS_DIR "sequence_transitions.mdl",
+                AI_CONFIG_IMPORT_MDL_HL1_READ_SEQUENCE_TRANSITIONS,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_TRANSITION_GRAPH));
+                    expect_global_info_eq(scene, 0, "NumTransitionNodes");
+                });
+
+        /* Verify that bone controllers info is *NOT* read when
+           'Read bone controllers' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_BONE_CONTROLLERS,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BONE_CONTROLLERS));
+                    expect_global_info_eq(scene, 0, "NumBoneControllers");
+                });
+
+        /* Verify that attachments info is *NOT* read when
+           'Read attachments' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_ATTACHMENTS,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_ATTACHMENTS));
+                    expect_global_info_eq(scene, 0, "NumAttachments");
+                });
+
+        /* Verify that hitboxes info is *NOT* read when
+           'Read hitboxes' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_HITBOXES,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    EXPECT_EQ(nullptr, scene->mRootNode->FindNode(AI_MDL_HL1_NODE_HITBOXES));
+                    expect_global_info_eq(scene, 0, "NumHitboxes");
+                });
+
+        /* Verify that misc global info is *NOT* read when
+           'Read misc global info' is disabled. */
+        load_with_import_setting_bool(
+                MDL_HL1_FILE_MAN,
+                AI_CONFIG_IMPORT_MDL_HL1_READ_MISC_GLOBAL_INFO,
+                false, // Set config value to false.
+                [&](const aiScene *scene) {
+                    aiNode *global_info = get_global_info(scene);
+                    EXPECT_NE(nullptr, global_info);
+                    aiVector3D temp;
+                    EXPECT_FALSE(global_info->mMetaData->Get("EyePosition", temp));
+                });
+    }
+
+private:
+    void load_with_import_setting_bool(
+            const char *file_path,
+            const char *setting_key,
+            bool setting_value,
+            std::function<void(const aiScene *)> &&func) {
+        Assimp::Importer importer;
+        importer.SetPropertyBool(setting_key, setting_value);
+        const aiScene *scene = importer.ReadFile(file_path, aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+        func(scene);
+    }
+
+    inline static aiNode *get_global_info(const aiScene *scene) {
+        return scene->mRootNode->FindNode(AI_MDL_HL1_NODE_GLOBAL_INFO);
+    }
+
+    template <typename T>
+    static void expect_global_info_eq(
+            const aiScene *scene,
+            T expected_value,
+            const char *key_name) {
+        aiNode *global_info = get_global_info(scene);
+        EXPECT_NE(nullptr, global_info);
+        T temp = 0;
+        EXPECT_TRUE(global_info->mMetaData->Get(key_name, temp));
+        EXPECT_EQ(expected_value, temp);
+    }
+
+    template <typename T>
+    static void expect_global_info_eq(const aiScene *scene,
+            std::initializer_list<std::pair<T, const char *>> p_kv) {
+        aiNode *global_info = get_global_info(scene);
+        EXPECT_NE(nullptr, global_info);
+        for (auto it = p_kv.begin(); it != p_kv.end(); ++it) {
+            T temp = 0;
+            EXPECT_TRUE(global_info->mMetaData->Get(it->second, temp));
+            EXPECT_EQ(it->first, temp);
+        }
+    }
+};
+
+TEST_F(utMDLImporter_HL1_ImportSettings, importSettings) {
+    importSettings();
+}

vendor/assimp/test/unit/ImportExport/MDL/utMDLImporter_HL1_Materials.cpp

@@ -0,0 +1,134 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @file utMDLImporter_HL1_Materials.cpp
+ *  @brief Half-Life 1 MDL loader materials tests.
+ */
+
+#include "AbstractImportExportBase.h"
+#include "AssetLib/MDL/HalfLife/HL1ImportDefinitions.h"
+#include "MDLHL1TestFiles.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utMDLImporter_HL1_Materials : public ::testing::Test {
+
+public:
+    /* Given an MDL model with a texture flagged as flatshade,
+       verify that the imported model has a flat shading model. */
+    void flatShadeTexture() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "chrome_sphere.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+        ASSERT_NE(nullptr, scene->mMaterials);
+
+        aiShadingMode shading_mode = aiShadingMode_Flat;
+        scene->mMaterials[0]->Get(AI_MATKEY_SHADING_MODEL, shading_mode);
+        EXPECT_EQ(aiShadingMode_Flat, shading_mode);
+    }
+
+    /* Given an MDL model with a chrome texture, verify that
+       the imported model has a chrome material. */
+    void chromeTexture() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "chrome_sphere.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+        ASSERT_NE(nullptr, scene->mMaterials);
+
+        int chrome;
+        scene->mMaterials[0]->Get(AI_MDL_HL1_MATKEY_CHROME(aiTextureType_DIFFUSE, 0), chrome);
+        EXPECT_EQ(1, chrome);
+    }
+
+    /* Given an MDL model with an additive texture, verify that
+       the imported model has an additive material. */
+    void additiveBlendTexture() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "blend_additive.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+        ASSERT_NE(nullptr, scene->mMaterials);
+
+        aiBlendMode blend_mode = aiBlendMode_Default;
+        scene->mMaterials[0]->Get(AI_MATKEY_BLEND_FUNC, blend_mode);
+        EXPECT_EQ(aiBlendMode_Additive, blend_mode);
+    }
+
+    /* Given an MDL model with a color masked texture, verify that
+       the imported model has a color masked material. Ensure too
+       that the transparency color is the correct one. */
+    void textureWithColorMask() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "alpha_test.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+        ASSERT_NE(nullptr, scene->mMaterials);
+
+        int texture_flags = 0;
+        scene->mMaterials[0]->Get(AI_MATKEY_TEXFLAGS_DIFFUSE(0), texture_flags);
+        EXPECT_EQ(aiTextureFlags_UseAlpha, texture_flags);
+
+        // The model has only one texture, a 256 color bitmap with
+        // a palette. Pure blue is the last color in the palette,
+        // and should be the transparency color.
+        aiColor3D transparency_color = {};
+        scene->mMaterials[0]->Get(AI_MATKEY_COLOR_TRANSPARENT, transparency_color);
+        EXPECT_EQ(aiColor3D(0, 0, 255), transparency_color);
+    }
+};
+
+TEST_F(utMDLImporter_HL1_Materials, flatShadeTexture) {
+    flatShadeTexture();
+}
+
+TEST_F(utMDLImporter_HL1_Materials, chromeTexture) {
+    chromeTexture();
+}
+
+TEST_F(utMDLImporter_HL1_Materials, additiveBlendTexture) {
+    additiveBlendTexture();
+}
+
+TEST_F(utMDLImporter_HL1_Materials, textureWithColorMask) {
+    textureWithColorMask();
+}

vendor/assimp/test/unit/ImportExport/MDL/utMDLImporter_HL1_Nodes.cpp

@@ -0,0 +1,563 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+/** @file utMDLImporter_HL1_Nodes.cpp
+ *  @brief Half-Life 1 MDL loader nodes tests.
+ */
+
+#include "AbstractImportExportBase.h"
+#include "AssetLib/MDL/HalfLife/HL1ImportDefinitions.h"
+#include "MDLHL1TestFiles.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utMDLImporter_HL1_Nodes : public ::testing::Test {
+
+    /**
+    * @note Represents a flattened node hierarchy where each item is a pair
+    * containing the node level and it's name.
+    */
+    using Hierarchy = std::vector<std::pair<unsigned int, std::string>>;
+
+    /**
+    * @note A vector of strings. Used for symplifying syntax.
+    */
+    using StringVector = std::vector<std::string>;
+
+public:
+    /**
+    * @note The following tests require a basic understanding
+    * of the SMD format. For more information about SMD format,
+    * please refer to the SMD importer or go to VDC
+    * (Valve Developer Community).
+    */
+
+    // Given a model, verify that the bones nodes hierarchy is correctly formed.
+    void checkBoneHierarchy() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "multiple_roots.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+        ASSERT_NE(nullptr, scene->mRootNode);
+
+        // First, check that "<MDL_root>" and "<MDL_bones>" are linked.
+        const aiNode* node_MDL_root = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_ROOT);
+        ASSERT_NE(nullptr, node_MDL_root);
+
+        const aiNode *node_MDL_bones = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BONES);
+        ASSERT_NE(nullptr, node_MDL_bones);
+        ASSERT_NE(nullptr, node_MDL_bones->mParent);
+        ASSERT_EQ(node_MDL_root, node_MDL_bones->mParent);
+
+        // Second, verify "<MDL_bones>" hierarchy.
+        const Hierarchy expected_hierarchy = {
+            { 0, AI_MDL_HL1_NODE_BONES },
+                { 1, "root1_bone1" },
+                    { 2, "root1_bone2" },
+                        { 3, "root1_bone4" },
+                        { 3, "root1_bone5" },
+                    { 2, "root1_bone3" },
+                        { 3, "root1_bone6" },
+                { 1, "root2_bone1" },
+                    { 2, "root2_bone2" },
+                    { 2, "root2_bone3" },
+                        { 3, "root2_bone5" },
+                    { 2, "root2_bone4" },
+                        { 3, "root2_bone6" },
+                { 1, "root3_bone1" },
+                    { 2, "root3_bone2" },
+                    { 2, "root3_bone3" },
+                    { 2, "root3_bone4" },
+                        { 3, "root3_bone5" },
+                            { 4, "root3_bone6" },
+                            { 4, "root3_bone7" },
+        };
+
+        Hierarchy actual_hierarchy;
+        flatten_hierarchy(node_MDL_bones, actual_hierarchy);
+        ASSERT_EQ(expected_hierarchy, actual_hierarchy);
+    }
+
+    /*  Given a model with bones that have empty names,
+        verify that all the bones of the imported model
+        have unique and no empty names.
+
+        ""        <----+---- empty names
+        ""        <----+
+        ""        <----+
+        "Bone_3"       |
+        ""        <----+
+        "Bone_2"       |
+        "Bone_5"       |
+        ""        <----+
+        ""        <----+
+    */
+    void emptyBonesNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "unnamed_bones.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_bones_names = {
+            "Bone",
+            "Bone_0",
+            "Bone_1",
+            "Bone_3",
+            "Bone_4",
+            "Bone_2",
+            "Bone_5",
+            "Bone_6",
+            "Bone_7"
+        };
+
+        StringVector actual_bones_names;
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BONES), actual_bones_names);
+        ASSERT_EQ(expected_bones_names, actual_bones_names);
+    }
+
+    /*  Given a model with bodyparts that have empty names,
+        verify that the imported model contains bodyparts with
+        unique and no empty names.
+
+        $body ""           <----+---- empty names
+        $body "Bodypart_1"      |
+        $body "Bodypart_5"      |
+        $body "Bodypart_6"      |
+        $body ""           <----+
+        $body "Bodypart_2"      |
+        $body ""           <----+
+        $body "Bodypart_3"      |
+        $body ""           <----+
+    */
+    void emptyBodypartsNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "unnamed_bodyparts.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_bodyparts_names = {
+            "Bodypart",
+            "Bodypart_1",
+            "Bodypart_5",
+            "Bodypart_6",
+            "Bodypart_0",
+            "Bodypart_2",
+            "Bodypart_4",
+            "Bodypart_3",
+            "Bodypart_7"
+        };
+
+        StringVector actual_bodyparts_names;
+        // Get the bodyparts names "without" the submodels.
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BODYPARTS), actual_bodyparts_names, 0);
+        ASSERT_EQ(expected_bodyparts_names, actual_bodyparts_names);
+    }
+
+    /*  Given a model with bodyparts that have duplicate names,
+        verify that the imported model contains bodyparts with
+        unique and no duplicate names.
+
+        $body "Bodypart"   <-----+
+        $body "Bodypart_1" <--+  |
+        $body "Bodypart_2"    |  |
+        $body "Bodypart1"     |  |
+        $body "Bodypart"   ---|--+
+        $body "Bodypart_1" ---+  |
+        $body "Bodypart2"        |
+        $body "Bodypart"   ------+
+        $body "Bodypart_4"
+    */
+    void duplicateBodypartsNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "duplicate_bodyparts.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_bodyparts_names = {
+            "Bodypart",
+            "Bodypart_1",
+            "Bodypart_2",
+            "Bodypart1",
+            "Bodypart_0",
+            "Bodypart_1_0",
+            "Bodypart2",
+            "Bodypart_3",
+            "Bodypart_4"
+        };
+
+        StringVector actual_bodyparts_names;
+        // Get the bodyparts names "without" the submodels.
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BODYPARTS), actual_bodyparts_names, 0);
+        ASSERT_EQ(expected_bodyparts_names, actual_bodyparts_names);
+    }
+
+    /*  Given a model with several bodyparts that contains multiple
+        sub models with the same file name, verify for each bodypart
+        sub model of the imported model that they have a unique name.
+
+        $bodygroup "first_bodypart"
+        {
+            studio "triangle"   <------+ duplicate file names.
+            studio "triangle"   -------+
+        }                              |
+                                       |
+        $bodygroup "second_bodypart"   |
+        {                              |
+            studio "triangle"   -------+ same as first bodypart, but with same file.
+            studio "triangle"   -------+
+        }
+
+        $bodygroup "last_bodypart"
+        {
+            studio "triangle2"  <------+ duplicate names.
+            studio "triangle2"  -------+
+        }
+    */
+    void duplicateSubModelsNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "duplicate_submodels.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const std::vector<StringVector> expected_bodypart_sub_models_names = {
+            {
+                    "triangle",
+                    "triangle_0",
+            },
+            {
+                    "triangle_1",
+                    "triangle_2",
+            },
+            {
+                    "triangle2",
+                    "triangle2_0",
+            }
+        };
+
+        const aiNode *bodyparts_node = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BODYPARTS);
+        ASSERT_NE(nullptr, bodyparts_node);
+        EXPECT_EQ(3u, bodyparts_node->mNumChildren);
+
+        StringVector actual_submodels_names;
+        for (unsigned int i = 0; i < bodyparts_node->mNumChildren; ++i)
+        {
+            actual_submodels_names.clear();
+            get_node_children_names(bodyparts_node->mChildren[i], actual_submodels_names);
+            ASSERT_EQ(expected_bodypart_sub_models_names[i], actual_submodels_names);
+        }
+    }
+
+    /*  Given a model with sequences that have duplicate names, verify
+        that each sequence from the imported model has a unique
+        name.
+
+        $sequence "idle_1" <-------+
+        $sequence "idle"   <----+  |
+        $sequence "idle_2"      |  |
+        $sequence "idle"   -----+  |
+        $sequence "idle_0"      |  |
+        $sequence "idle_1" -----|--+
+        $sequence "idle_3"      |
+        $sequence "idle"   -----+
+        $sequence "idle_7"
+    */
+    void duplicateSequenceNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "duplicate_sequences.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_sequence_names = {
+            "idle_1",
+            "idle",
+            "idle_2",
+            "idle_4",
+            "idle_0",
+            "idle_1_0",
+            "idle_3",
+            "idle_5",
+            "idle_7"
+        };
+
+        StringVector actual_sequence_names;
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_INFOS), actual_sequence_names);
+        ASSERT_EQ(expected_sequence_names, actual_sequence_names);
+    }
+
+    /*  Given a model with sequences that have empty names, verify
+        that each sequence from the imported model has a unique
+        name.
+
+        $sequence ""            <----+---- empty names
+        $sequence "Sequence_1"       |
+        $sequence ""            <----+
+        $sequence "Sequence_4"       |
+        $sequence ""            <----+
+        $sequence "Sequence_8"       |
+        $sequence ""            <----+
+        $sequence "Sequence_2"       |
+        $sequence ""            <----+
+    */
+    void emptySequenceNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "unnamed_sequences.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_sequence_names = {
+            "Sequence",
+            "Sequence_1",
+            "Sequence_0",
+            "Sequence_4",
+            "Sequence_3",
+            "Sequence_8",
+            "Sequence_5",
+            "Sequence_2",
+            "Sequence_6"
+        };
+
+        StringVector actual_sequence_names;
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_INFOS), actual_sequence_names);
+        ASSERT_EQ(expected_sequence_names, actual_sequence_names);
+    }
+
+    /*  Given a model with sequence groups that have duplicate names,
+        verify that each sequence group from the imported model has
+        a unique name.
+
+        "default"
+        $sequencegroup "SequenceGroup"    <----+
+        $sequencegroup "SequenceGroup_1"       |
+        $sequencegroup "SequenceGroup_5"  <----|--+
+        $sequencegroup "SequenceGroup"    -----+  |
+        $sequencegroup "SequenceGroup_0"       |  |
+        $sequencegroup "SequenceGroup"    -----+  |
+        $sequencegroup "SequenceGroup_5"  --------+
+        $sequencegroup "SequenceGroup_6"
+        $sequencegroup "SequenceGroup_2"
+    */
+    void duplicateSequenceGroupNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "duplicate_sequence_groups/duplicate_sequence_groups.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_sequence_names = {
+            "default",
+            "SequenceGroup",
+            "SequenceGroup_1",
+            "SequenceGroup_5",
+            "SequenceGroup_3",
+            "SequenceGroup_0",
+            "SequenceGroup_4",
+            "SequenceGroup_5_0",
+            "SequenceGroup_6",
+            "SequenceGroup_2"
+        };
+
+        StringVector actual_sequence_names;
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_GROUPS), actual_sequence_names);
+        ASSERT_EQ(expected_sequence_names, actual_sequence_names);
+    }
+
+    /*  Given a model with sequence groups that have empty names,
+        verify that each sequence group from the imported model has
+        a unique name.
+
+        "default"
+        $sequencegroup ""                 <----+---- empty names
+        $sequencegroup "SequenceGroup_2"       |
+        $sequencegroup "SequenceGroup_6"       |
+        $sequencegroup ""                 <----+
+        $sequencegroup ""                 <----+
+        $sequencegroup "SequenceGroup_1"       |
+        $sequencegroup "SequenceGroup_5"       |
+        $sequencegroup ""                 <----+
+        $sequencegroup "SequenceGroup_4"
+    */
+    void emptySequenceGroupNames() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "unnamed_sequence_groups/unnamed_sequence_groups.mdl", aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        const StringVector expected_sequence_names = {
+            "default",
+            "SequenceGroup",
+            "SequenceGroup_2",
+            "SequenceGroup_6",
+            "SequenceGroup_0",
+            "SequenceGroup_3",
+            "SequenceGroup_1",
+            "SequenceGroup_5",
+            "SequenceGroup_7",
+            "SequenceGroup_4"
+        };
+
+        StringVector actual_sequence_names;
+        get_node_children_names(scene->mRootNode->FindNode(AI_MDL_HL1_NODE_SEQUENCE_GROUPS), actual_sequence_names);
+        ASSERT_EQ(expected_sequence_names, actual_sequence_names);
+    }
+
+    /*  Verify that mOffsetMatrix applies the correct
+        inverse bind pose transform. */
+    void offsetMatrixUnappliesTransformations() {
+
+        const float TOLERANCE = 0.01f;
+
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(MDL_HL1_FILE_MAN, aiProcess_ValidateDataStructure);
+        ASSERT_NE(nullptr, scene);
+
+        aiNode *scene_bones_node = scene->mRootNode->FindNode(AI_MDL_HL1_NODE_BONES);
+
+        const aiMatrix4x4 identity_matrix;
+
+        for (unsigned int i = 0; i < scene->mNumMeshes; ++i) {
+            aiMesh *scene_mesh = scene->mMeshes[i];
+            for (unsigned int j = 0; j < scene_mesh->mNumBones; ++j) {
+                aiBone *scene_mesh_bone = scene_mesh->mBones[j];
+
+                // Store local node transforms.
+                aiNode *n = scene_bones_node->FindNode(scene_mesh_bone->mName);
+                std::vector<aiMatrix4x4> bone_matrices = { n->mTransformation };
+                while (n->mParent != scene->mRootNode) {
+                    n = n->mParent;
+                    bone_matrices.push_back(n->mTransformation);
+                }
+
+                // Compute absolute node transform.
+                aiMatrix4x4 transform;
+                for (auto it = bone_matrices.rbegin(); it != bone_matrices.rend(); ++it)
+                    transform *= *it;
+
+                // Unapply the transformation using the offset matrix.
+                aiMatrix4x4 unapplied_transform = scene_mesh_bone->mOffsetMatrix * transform;
+
+                // Ensure that we have, approximately, the identity matrix.
+                expect_equal_matrices(identity_matrix, unapplied_transform, TOLERANCE);
+            }
+        }
+    }
+
+private:
+    void expect_equal_matrices(const aiMatrix4x4 &expected, const aiMatrix4x4 &actual, float abs_error) {
+        for (int i = 0; i < 4; ++i) {
+            for (int j = 0; j < 4; ++j)
+                EXPECT_NEAR(expected[i][j], actual[i][j], abs_error);
+        }
+    }
+
+    /** Get a flattened representation of a node's hierarchy.
+     * \param[in] node The node.
+     * \param[out] hierarchy The flattened node's hierarchy.
+     */
+    void flatten_hierarchy(const aiNode *node, Hierarchy &hierarchy)
+    {
+        flatten_hierarchy_impl(node, hierarchy, 0);
+    }
+
+    void flatten_hierarchy_impl(const aiNode *node, Hierarchy &hierarchy, unsigned int level)
+    {
+        hierarchy.push_back({ level, node->mName.C_Str() });
+        for (size_t i = 0; i < node->mNumChildren; ++i)
+        {
+            flatten_hierarchy_impl(node->mChildren[i], hierarchy, level + 1);
+        }
+    }
+
+    /** Get all node's children names beneath max_level.
+     * \param[in] node The parent node from which to get all children names.
+     * \param[out] names The list of children names.
+     * \param[in] max_level If set to -1, all children names will be collected.
+     */
+    void get_node_children_names(const aiNode *node, StringVector &names, const int max_level = -1)
+    {
+        get_node_children_names_impl(node, names, 0, max_level);
+    }
+
+    void get_node_children_names_impl(const aiNode *node, StringVector &names, int level, const int max_level = -1)
+    {
+        for (size_t i = 0; i < node->mNumChildren; ++i)
+        {
+            names.push_back(node->mChildren[i]->mName.C_Str());
+            if (max_level == -1 || level < max_level)
+            {
+                get_node_children_names_impl(node->mChildren[i], names, level + 1, max_level);
+            }
+        }
+    }
+};
+
+TEST_F(utMDLImporter_HL1_Nodes, checkBoneHierarchy) {
+    checkBoneHierarchy();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, emptyBonesNames) {
+    emptyBonesNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, emptyBodypartsNames) {
+    emptyBodypartsNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, duplicateBodypartsNames) {
+    duplicateBodypartsNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, duplicateSubModelsNames) {
+    duplicateSubModelsNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, emptySequenceNames) {
+    emptySequenceNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, duplicateSequenceNames) {
+    duplicateSequenceNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, emptySequenceGroupNames) {
+    emptySequenceGroupNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, duplicateSequenceGroupNames) {
+    duplicateSequenceGroupNames();
+}
+
+TEST_F(utMDLImporter_HL1_Nodes, offsetMatrixUnappliesTransformations) {
+    offsetMatrixUnappliesTransformations();
+}

vendor/assimp/test/unit/ImportExport/Pbrt/utPbrtImportExport.cpp

@@ -0,0 +1,70 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+#include <assimp/Exporter.hpp>
+
+using namespace Assimp;
+
+class utPbrtImportExport : public AbstractImportExportBase {
+public:
+#ifndef ASSIMP_BUILD_NO_EXPORT
+	bool exporterTest() override {
+		Assimp::Importer importer;
+		const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/spider.obj", aiProcess_ValidateDataStructure);
+		EXPECT_NE(scene, nullptr );
+
+        ::Assimp::Exporter exporter;
+		return AI_SUCCESS == exporter.Export(scene, "pbrt", ASSIMP_TEST_MODELS_DIR "/OBJ/spider_out.pbrt");
+    }
+#endif
+};
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+TEST_F(utPbrtImportExport, exportTest_Success) {
+    EXPECT_TRUE(exporterTest());
+}
+
+#endif // ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/ImportExport/RAW/utRAWImportExport.cpp

@@ -0,0 +1,64 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utRAWImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/RAW/Wuson.raw", aiProcess_ValidateDataStructure);
+#ifndef ASSIMP_BUILD_NO_RAW_IMPORTER
+        return nullptr != scene;
+#else
+        return nullptr == scene;
+#endif
+    }
+};
+
+TEST_F(utRAWImportExport, importSimpleRAWTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/Terragen/utTerragenImportExport.cpp

@@ -0,0 +1,59 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+class utTerragenImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/TER/RealisticTerrain.ter", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utTerragenImportExport, importFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/utAssjsonImportExport.cpp

@@ -0,0 +1,91 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+class utAssjsonImportExport : public AbstractImportExportBase {
+public:
+    bool exporterTest() override {
+        Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/spider.obj", aiProcess_ValidateDataStructure);
+
+        Exporter exporter;
+        const char *testFileName = "./spider_test.json";
+        aiReturn res = exporter.Export(scene, "assjson", testFileName);
+        if (aiReturn_SUCCESS != res) {
+            return false;
+        }
+
+        Assimp::ExportProperties exportProperties;
+        exportProperties.SetPropertyBool("JSON_SKIP_WHITESPACES", true);
+        const char *testNoWhitespaceFileName = "./spider_test_nowhitespace.json";
+        aiReturn resNoWhitespace = exporter.Export(scene, "assjson", testNoWhitespaceFileName, 0u, &exportProperties);
+        if (aiReturn_SUCCESS != resNoWhitespace) {
+            return false;
+        }
+
+        // Cleanup, remove generated json
+        if (0 != std::remove(testFileName)) {
+            return false;
+        }
+
+        if (0 != std::remove(testNoWhitespaceFileName)) {
+            return false;
+        }
+
+        return true;
+    }
+};
+
+TEST_F(utAssjsonImportExport, exportTest) {
+    EXPECT_TRUE(exporterTest());
+}
+
+#endif // ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/ImportExport/utCOBImportExport.cpp

@@ -0,0 +1,104 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+TEST(utCOBImporter, importDwarfASCII) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/dwarf_ascii.cob", aiProcess_ValidateDataStructure);
+    // FIXME: this is wrong, it should succeed
+    // change to ASSERT_NE after it's been fixed
+    ASSERT_EQ(nullptr, scene);
+}
+
+TEST(utCOBImporter, importDwarf) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/dwarf.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importMoleculeASCII) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/molecule_ascii.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importMolecule) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/molecule.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importSpider43ASCII) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/spider_4_3_ascii.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importSpider43) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/spider_4_3.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importSpider66ASCII) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/spider_6_6_ascii.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importSpider66) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/COB/spider_6_6.cob", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utCOBImporter, importInvalidHeader) {
+    Assimp::Importer importer;
+    constexpr char Header[] = "Caligari ??LZSCALEb
";
+    const aiScene *scene = importer.ReadFileFromMemory(Header, sizeof(Header), aiProcess_ValidateDataStructure);
+    ASSERT_EQ(nullptr, scene);
+}

vendor/assimp/test/unit/ImportExport/utExporter.cpp

@@ -0,0 +1,105 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/Exporter.hpp>
+#include <assimp/ProgressHandler.hpp>
+
+using namespace Assimp;
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+class TestProgressHandler : public ProgressHandler {
+public:
+    TestProgressHandler() :
+            ProgressHandler(),
+            mPercentage(0.f) {
+        // empty
+    }
+
+    virtual ~TestProgressHandler() = default;
+
+    bool Update(float percentage = -1.f) override {
+        mPercentage = percentage;
+        return true;
+    }
+    float mPercentage;
+};
+
+class ExporterTest : public ::testing::Test {
+    // empty
+};
+
+TEST_F(ExporterTest, ProgressHandlerTest) {
+    Exporter exporter;
+    TestProgressHandler *ph(new TestProgressHandler);
+    exporter.SetProgressHandler(ph);
+}
+
+// Make sure all the registered exporters have useful descriptions
+TEST_F(ExporterTest, ExporterIdTest) {
+    Exporter exporter;
+    size_t exportFormatCount = exporter.GetExportFormatCount();
+    EXPECT_NE(0u, exportFormatCount) << "No registered exporters";
+    typedef std::map<std::string, const aiExportFormatDesc *> ExportIdMap;
+    ExportIdMap exporterMap;
+    for (size_t i = 0; i < exportFormatCount; ++i) {
+        // Check that the exporter description exists and makes sense
+        const aiExportFormatDesc *desc = exporter.GetExportFormatDescription(i);
+        ASSERT_NE(nullptr, desc) << "Missing aiExportFormatDesc at index " << i;
+        EXPECT_NE(nullptr, desc->id) << "Null exporter ID at index " << i;
+        EXPECT_STRNE("", desc->id) << "Empty exporter ID at index " << i;
+        EXPECT_NE(nullptr, desc->description) << "Null exporter description at index " << i;
+        EXPECT_STRNE("", desc->description) << "Empty exporter description at index " << i;
+        EXPECT_NE(nullptr, desc->fileExtension) << "Null exporter file extension at index " << i;
+        EXPECT_STRNE("", desc->fileExtension) << "Empty exporter file extension at index " << i;
+
+        // Check the ID is unique
+        std::string key(desc->id);
+        std::pair<ExportIdMap::iterator, bool> result = exporterMap.emplace(key, desc);
+        EXPECT_TRUE(result.second) << "Duplicate exported id: '" << key << "' " << desc->description << " *." << desc->fileExtension << " at index " << i;
+    }
+
+    const aiExportFormatDesc *desc = exporter.GetExportFormatDescription(exportFormatCount);
+    EXPECT_EQ(nullptr, desc) << "More exporters than claimed";
+}
+
+#endif

vendor/assimp/test/unit/ImportExport/utMD2Importer.cpp

@@ -0,0 +1,78 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+TEST(utMD2Importer, importFaerie) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MD2/faerie.md2", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD2Importer, importSydney) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MD2/sydney.md2", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD2Importer, importDolphin) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD2/dolphin.md2", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD2Importer, importFlag) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD2/flag.md2", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD2Importer, importHorse) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD2/horse.md2", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/ImportExport/utMD3Importer.cpp

@@ -0,0 +1,67 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2021, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+
+using namespace Assimp;
+
+TEST(utMD3Importer, importWatercan) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD3/watercan.md3", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD3Importer, importWatercan_dmg) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD3/watercan_dmg.md3", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD3Importer, importEuropean_fnt_v2) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD3/q3root/models/mapobjects/kt_kubalwagon/european_fnt_v2.md3", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/ImportExport/utMD5Importer.cpp

@@ -0,0 +1,72 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+TEST(utMD5Importer, importEmpty) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MD5/invalid/empty.md5mesh", aiProcess_ValidateDataStructure);
+    ASSERT_EQ(nullptr, scene);
+}
+
+TEST(utMD5Importer, importSimpleCube) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MD5/SimpleCube.md5mesh", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD5Importer, importBoarMan) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD5/BoarMan.md5mesh", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utMD5Importer, importBob) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/MD5/Bob.md5mesh", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/ImportExport/utMDLImporter.cpp

@@ -0,0 +1,80 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include "AbstractImportExportBase.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+#include "MDL/MDLHL1TestFiles.h"
+
+using namespace Assimp;
+
+class utMDLImporter : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+
+        Assimp::Importer importer;
+        importerTest_HL1(&importer);
+
+        // Add further MDL tests...
+
+        return true;
+    }
+
+private:
+    void importerTest_HL1(Assimp::Importer *const importer) {
+        const aiScene *scene = importer->ReadFile(MDL_HL1_FILE_MAN, 0);
+        EXPECT_NE(nullptr, scene);
+
+        // Test that the importer can directly load an HL1 MDL external texture file.
+        scene = importer->ReadFile(ASSIMP_TEST_MDL_HL1_MODELS_DIR "manT.mdl", aiProcess_ValidateDataStructure);
+        EXPECT_NE(nullptr, scene);
+        EXPECT_NE(0u, scene->mNumTextures);
+        EXPECT_NE(0u, scene->mNumMaterials);
+    }
+};
+
+TEST_F(utMDLImporter, importMDLFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/utNFFImportExport.cpp

@@ -0,0 +1,60 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utNFFImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/NFF/ManyEarthsNotJustOne.nff", 0);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utNFFImportExport, importNFFFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/utOFFImportExport.cpp

@@ -0,0 +1,60 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+class utOFFImportExport : public AbstractImportExportBase {
+protected:
+    virtual bool importerTest() {
+        ::Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OFF/Cube.off", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utOFFImportExport, importOFFFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/utOgreImportExport.cpp

@@ -0,0 +1,61 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utOgreImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Ogre/TheThing/Mesh.mesh.xml", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utOgreImportExport, importerTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/utQ3BSPFileImportExport.cpp

@@ -0,0 +1,61 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utQ3BSPImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/PK3/SGDTT3.pk3", 0);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utQ3BSPImportExport, importerTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/ImportExport/utXGLImportExport.cpp

@@ -0,0 +1,94 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+TEST(utXGLImporter, importBCN_Epileptic) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/BCN_Epileptic.zgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importCubesWithAlpha) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/cubes_with_alpha.zgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importSample_official) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/sample_official.xgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importSample_official_asxml) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/sample_official_asxml.xml", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importSphereWithMatGloss) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/sphere_with_mat_gloss_10pc.zgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importSpiderASCII) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/Spider_ascii.zgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importWuson) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/Wuson.zgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utXGLImporter, importWusonDXF) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/XGL/wuson_dxf.zgl", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/Main.cpp

@@ -0,0 +1,31 @@
+#include "../../include/assimp/DefaultLogger.hpp"
+#include "UnitTestPCH.h"
+#include <ctime>
+
+int main(int argc, char *argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    // seed the randomizer with the current system time
+    time_t t;
+    time(&t);
+    srand((unsigned int)t);
+
+    // ............................................................................
+
+    // create a logger from both CPP
+    Assimp::DefaultLogger::create("AssimpLog_Cpp.log", Assimp::Logger::VERBOSE,
+            aiDefaultLogStream_STDOUT | aiDefaultLogStream_DEBUGGER | aiDefaultLogStream_FILE);
+
+    // .. and C. They should smoothly work together
+    aiEnableVerboseLogging(AI_TRUE);
+    aiLogStream logstream = aiGetPredefinedLogStream(aiDefaultLogStream_FILE, "AssimpLog_C.log");
+    aiAttachLogStream(&logstream);
+
+    int result = RUN_ALL_TESTS();
+
+    // ............................................................................
+    // but shutdown must be done from C to ensure proper deallocation
+    aiDetachAllLogStreams();
+
+    return result;
+}

vendor/assimp/test/unit/MathTest.cpp

@@ -0,0 +1,54 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "MathTest.h"
+
+namespace Assimp {
+
+// Initialize epsilon value.
+const float AssimpMathTest::Epsilon = Math::getEpsilon<float>();
+
+// Initialize with an interval of [1,100].
+RandomUniformFloatGenerator AssimpMathTest::RandNonZero(1.0f, 100.0f);
+
+// Initialize with an interval of [-PI,PI] inclusively.
+RandomUniformFloatGenerator AssimpMathTest::RandPI(-Math::aiPi<float>(), Math::aiPi<float>());
+
+}

vendor/assimp/test/unit/MathTest.h

@@ -0,0 +1,103 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#ifndef ASSIMP_MATH_TEST_H
+#define ASSIMP_MATH_TEST_H
+
+#include "UnitTestPCH.h"
+#include <assimp/types.h>
+#include "RandomNumberGeneration.h"
+
+namespace Assimp {
+
+/** Custom test class providing several math related utilities. */
+class AssimpMathTest : public ::testing::Test {
+public:
+    /** Return a random non-null 2D vector. */
+    inline static aiVector2D random_vec2() {
+        return aiVector2D(RandNonZero.next(), RandNonZero.next());
+    }
+
+    /** Return a random non-null 3D vector. */
+    inline static aiVector3D random_vec3() {
+        return aiVector3D(RandNonZero.next(), RandNonZero.next(),RandNonZero.next());
+    }
+
+    /** Return a random unit 3D vector. */
+    inline static aiVector3D random_unit_vec3() {
+        return random_vec3().NormalizeSafe();
+    }
+
+    /** Return a quaternion with random orientation and
+      * rotation angle around axis. */
+    inline static aiQuaternion random_quat() {
+        return aiQuaternion(random_unit_vec3(), RandPI.next());
+    }
+
+    /** Return a random non-null 3x3 matrix. */
+    inline static aiMatrix3x3 random_mat3() {
+        return aiMatrix3x3(
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next(),
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next(),
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next());
+    }
+
+    /** Return a random non-null 4x4 matrix. */
+    inline static aiMatrix4x4 random_mat4() {
+        return aiMatrix4x4(
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next(), RandNonZero.next(),
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next(), RandNonZero.next(),
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next(), RandNonZero.next(),
+            RandNonZero.next(), RandNonZero.next(),RandNonZero.next(), RandNonZero.next());
+    }
+
+    /** Epsilon value to use in tests. */
+    static const float Epsilon;
+
+    /** Random number generators. */
+    static RandomUniformFloatGenerator RandNonZero, RandPI;
+};
+
+}
+
+#endif // ASSIMP_MATH_TEST_H

vendor/assimp/test/unit/RandomNumberGeneration.h

@@ -0,0 +1,82 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#ifndef ASSIMP_RANDOM_NUMBER_GENERATION_H
+#define ASSIMP_RANDOM_NUMBER_GENERATION_H
+
+#include <random>
+
+namespace Assimp {
+
+/** Helper class to use for generating pseudo-random
+ *  real numbers, with a uniform distribution. */
+template<typename T>
+class RandomUniformRealGenerator {
+public:
+    RandomUniformRealGenerator() :
+            dist_(),
+            rd_(),
+            re_(rd_())  {
+        // empty
+    }
+
+    RandomUniformRealGenerator(T min, T max) :
+            dist_(min, max),
+            rd_(),
+            re_(rd_())  {
+        // empty
+    }
+
+    inline T next() {
+        return dist_(re_);
+    }
+
+private:
+    std::uniform_real_distribution<T> dist_;
+    std::random_device rd_;
+    std::default_random_engine re_;
+};
+
+using RandomUniformFloatGenerator = RandomUniformRealGenerator<float>;
+
+}
+
+#endif // ASSIMP_RANDOM_NUMBER_GENERATION_H

vendor/assimp/test/unit/SceneDiffer.cpp

@@ -0,0 +1,372 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "SceneDiffer.h"
+#include <assimp/scene.h>
+#include <assimp/mesh.h>
+#include <assimp/material.h>
+#include <sstream>
+
+namespace Assimp {
+
+SceneDiffer::SceneDiffer()
+: m_diffs() {
+    // empty
+}
+
+SceneDiffer::~SceneDiffer() = default;
+
+bool SceneDiffer::isEqual( const aiScene *expected, const aiScene *toCompare ) {
+    if ( expected == toCompare ) {
+        return true;
+    }
+
+    if ( nullptr == expected ) {
+        return false;
+    }
+
+    if ( nullptr == toCompare ) {
+        return false;
+    }
+
+    // meshes
+    if ( expected->mNumMeshes != toCompare->mNumMeshes ) {
+        std::stringstream stream;
+        stream << "Number of meshes not equal ( expected: " << expected->mNumMeshes << ", found : " << toCompare->mNumMeshes << " )\n";
+        addDiff( stream.str() );
+        return false;
+    }
+
+    for ( unsigned int i = 0; i < expected->mNumMeshes; i++ ) {
+        aiMesh *expMesh( expected->mMeshes[ i ] );
+        aiMesh *toCompMesh( toCompare->mMeshes[ i ] );
+        if ( !compareMesh( expMesh, toCompMesh ) ) {
+            std::stringstream stream;
+            stream << "Meshes are not equal, index : " << i << "\n";
+            addDiff( stream.str() );
+        }
+    }
+
+    // materials
+    /*if ( expected->mNumMaterials != toCompare->mNumMaterials ) {
+        std::stringstream stream;
+        stream << "Number of materials not equal ( expected: " << expected->mNumMaterials << ", found : " << toCompare->mNumMaterials << " )\n";
+        addDiff( stream.str() );
+        return false;
+    }
+
+    if ( expected->mNumMaterials > 0 ) {
+        if ( nullptr == expected->mMaterials || nullptr == toCompare->mMaterials ) {
+            addDiff( "Number of materials > 0 and mat pointer is nullptr" );
+            return false;
+        }
+    }
+
+    for ( unsigned int i = 0; i < expected->mNumMaterials; i++ ) {
+        aiMaterial *expectedMat( expected->mMaterials[ i ] );
+        aiMaterial *toCompareMat( expected->mMaterials[ i ] );
+        if ( !compareMaterial( expectedMat, toCompareMat ) ) {
+            std::stringstream stream;
+            stream << "Materials are not equal, index : " << i << "\n";
+            addDiff( stream.str() );
+            return false;
+        }
+    }*/
+
+    return true;
+}
+
+void SceneDiffer::showReport() {
+    if ( m_diffs.empty() ) {
+        return;
+    }
+
+    for ( std::vector<std::string>::iterator it = m_diffs.begin(); it != m_diffs.end(); ++it ) {
+        std::cout << *it << "\n";
+    }
+
+    std::cout << std::endl;
+}
+
+void SceneDiffer::reset() {
+    m_diffs.resize( 0 );
+}
+
+void SceneDiffer::addDiff( const std::string &diff ) {
+    if ( diff.empty() ) {
+        return;
+    }
+    m_diffs.push_back( diff );
+}
+
+static std::string dumpVector3( const aiVector3D &toDump ) {
+    std::stringstream stream;
+    stream << "( " << toDump.x << ", " << toDump.y << ", " << toDump.z << ")";
+    return stream.str();
+}
+
+/*static std::string dumpColor4D( const aiColor4D &toDump ) {
+    std::stringstream stream;
+    stream << "( " << toDump.r << ", " << toDump.g << ", " << toDump.b << ", " << toDump.a << ")";
+    return stream.str();
+}*/
+
+static std::string dumpFace( const aiFace &face ) {
+    std::stringstream stream;
+    for ( unsigned int i = 0; i < face.mNumIndices; i++ ) {
+        stream << face.mIndices[ i ];
+        if ( i < face.mNumIndices - 1 ) {
+            stream << ", ";
+        }
+        else {
+            stream << "\n";
+        }
+    }
+    return stream.str();
+}
+
+bool SceneDiffer::compareMesh( aiMesh *expected, aiMesh *toCompare ) {
+    if ( expected == toCompare ) {
+        return true;
+    }
+
+    if ( nullptr == expected || nullptr == toCompare ) {
+        return false;
+    }
+
+    if ( expected->mName != toCompare->mName ) {
+        std::stringstream stream;
+        stream << "Mesh name not equal ( expected: " << expected->mName.C_Str() << ", found : " << toCompare->mName.C_Str() << " )\n";
+        addDiff( stream.str() );
+    }
+
+    if ( expected->mNumVertices != toCompare->mNumVertices ) {
+        std::stringstream stream;
+        stream << "Number of vertices not equal ( expected: " << expected->mNumVertices << ", found : " << toCompare->mNumVertices << " )\n";
+        addDiff( stream.str() );
+        return false;
+    }
+
+    // positions
+    if ( expected->HasPositions() != toCompare->HasPositions() ) {
+        addDiff( "Expected are vertices, toCompare does not have any." );
+        return false;
+    }
+
+    bool vertEqual( true );
+    for ( unsigned int i = 0; i < expected->mNumVertices; i++ ) {
+        aiVector3D &expVert( expected->mVertices[ i ] );
+        aiVector3D &toCompVert( toCompare->mVertices[ i ] );
+        if ( !expVert.Equal( toCompVert ) ) {
+            std::cout << "index = " << i << dumpVector3( toCompVert ) << "\n";
+            std::stringstream stream;
+            stream << "Vertex not equal ( expected: " << dumpVector3( toCompVert ) << ", found: " << dumpVector3( toCompVert ) << "\n";
+            addDiff( stream.str() );
+            vertEqual = false;
+        }
+    }
+    if ( !vertEqual ) {
+        return false;
+    }
+
+    // normals
+    if ( expected->HasNormals() != toCompare->HasNormals() ) {
+        addDiff( "Expected are normals, toCompare does not have any." );
+        return false;
+    }
+
+    //    return true;
+
+        //ToDo!
+    /*bool normalEqual( true );
+        for ( unsigned int i = 0; i < expected->mNumVertices; i++ ) {
+            aiVector3D &expNormal( expected->mNormals[ i ] );
+            aiVector3D &toCompNormal( toCompare->mNormals[ i ] );
+            if ( expNormal.Equal( toCompNormal ) ) {
+                std::stringstream stream;
+                stream << "Normal not equal ( expected: " << dumpVector3( expNormal ) << ", found: " << dumpVector3( toCompNormal ) << "\n";
+                addDiff( stream.str() );
+                normalEqual = false;
+            }
+        }
+        if ( !normalEqual ) {
+            return false;
+        }
+
+        // vertex colors
+        bool vertColEqual( true );
+        for ( unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++ ) {
+            if ( expected->HasVertexColors(a) != toCompare->HasVertexColors(a) ) {
+                addDiff( "Expected are normals, toCompare does not have any." );
+                return false;
+            }
+            for ( unsigned int i = 0; i < expected->mNumVertices; i++ ) {
+                aiColor4D &expColor4D( expected->mColors[ a ][ i ] );
+                aiColor4D &toCompColor4D( toCompare->mColors[ a ][ i ] );
+                if ( expColor4D != toCompColor4D ) {
+                    std::stringstream stream;
+                    stream << "Color4D not equal ( expected: " << dumpColor4D( expColor4D ) << ", found: " << dumpColor4D( toCompColor4D ) << "\n";
+                    addDiff( stream.str() );
+                    vertColEqual = false;
+                }
+            }
+            if ( !vertColEqual ) {
+                return false;
+            }
+        }
+
+        // texture coords
+        bool texCoordsEqual( true );
+        for ( unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++ ) {
+            if ( expected->HasTextureCoords( a ) != toCompare->HasTextureCoords( a ) ) {
+                addDiff( "Expected are texture coords, toCompare does not have any." );
+                return false;
+            }
+            for ( unsigned int i = 0; i < expected->mNumVertices; i++ ) {
+                aiVector3D &expTexCoord( expected->mTextureCoords[ a ][ i ] );
+                aiVector3D &toCompTexCoord( toCompare->mTextureCoords[ a ][ i ] );
+                if ( expTexCoord.Equal( toCompTexCoord ) ) {
+                    std::stringstream stream;
+                    stream << "Texture coords not equal ( expected: " << dumpVector3( expTexCoord ) << ", found: " << dumpVector3( toCompTexCoord ) << "\n";
+                    addDiff( stream.str() );
+                    vertColEqual = false;
+                }
+            }
+            if ( !vertColEqual ) {
+                return false;
+            }
+        }
+
+        // tangents and bi-tangents
+        if ( expected->HasTangentsAndBitangents() != toCompare->HasTangentsAndBitangents() ) {
+            addDiff( "Expected are tangents and bi-tangents, toCompare does not have any." );
+            return false;
+        }
+        bool tangentsEqual( true );
+        for ( unsigned int i = 0; i < expected->mNumVertices; i++ ) {
+            aiVector3D &expTangents( expected->mTangents[ i ] );
+            aiVector3D &toCompTangents( toCompare->mTangents[ i ] );
+            if ( expTangents.Equal( toCompTangents ) ) {
+                std::stringstream stream;
+                stream << "Tangents not equal ( expected: " << dumpVector3( expTangents ) << ", found: " << dumpVector3( toCompTangents ) << "\n";
+                addDiff( stream.str() );
+                tangentsEqual = false;
+            }
+
+            aiVector3D &expBiTangents( expected->mBitangents[ i ] );
+            aiVector3D &toCompBiTangents( toCompare->mBitangents[ i ] );
+            if ( expBiTangents.Equal( toCompBiTangents ) ) {
+                std::stringstream stream;
+                stream << "Tangents not equal ( expected: " << dumpVector3( expBiTangents ) << ", found: " << dumpVector3( toCompBiTangents ) << " )\n";
+                addDiff( stream.str() );
+                tangentsEqual = false;
+            }
+        }
+        if ( !tangentsEqual ) {
+            return false;
+        }*/
+
+        // faces
+    if ( expected->mNumFaces != toCompare->mNumFaces ) {
+        std::stringstream stream;
+        stream << "Number of faces are not equal, ( expected: " << expected->mNumFaces << ", found: " << toCompare->mNumFaces << ")\n";
+        addDiff( stream.str() );
+        return false;
+    }
+    bool facesEqual( true );
+    for ( unsigned int i = 0; i < expected->mNumFaces; i++ ) {
+        aiFace &expFace( expected->mFaces[ i ] );
+        aiFace &toCompareFace( toCompare->mFaces[ i ] );
+        if ( !compareFace( &expFace, &toCompareFace ) ) {
+            addDiff( "Faces are not equal\n" );
+            addDiff( dumpFace( expFace ) );
+            addDiff( dumpFace( toCompareFace ) );
+            facesEqual = false;
+        }
+    }
+    if ( !facesEqual ) {
+        return false;
+    }
+
+    return true;
+}
+
+bool SceneDiffer::compareFace( aiFace *expected, aiFace *toCompare ) {
+    if ( nullptr == expected ) {
+        return false;
+    }
+    if ( nullptr == toCompare ) {
+        return false;
+    }
+
+    // same instance
+    if ( expected == toCompare ) {
+        return true;
+    }
+
+    // using compare operator
+    if ( *expected == *toCompare ) {
+        return true;
+    }
+
+    return false;
+}
+
+bool SceneDiffer::compareMaterial( aiMaterial *expected, aiMaterial *toCompare ) {
+    if ( nullptr == expected ) {
+        return false;
+    }
+    if ( nullptr == toCompare ) {
+        return false;
+    }
+
+    // same instance
+    if ( expected == toCompare ) {
+        return true;
+    }
+
+    // todo!
+
+    return true;
+}
+
+}

vendor/assimp/test/unit/SceneDiffer.h

@@ -0,0 +1,75 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+
+#include "UnitTestPCH.h"
+#include <assimp/fast_atof.h>
+#include <vector>
+#include <string>
+
+struct aiScene;
+struct aiMesh;
+struct aiMaterial;
+struct aiFace;
+
+namespace Assimp {
+
+class SceneDiffer {
+public:
+    SceneDiffer();
+    ~SceneDiffer();
+    bool isEqual( const aiScene *expected, const aiScene *toCompare );
+    void showReport();
+    void reset();
+
+protected:
+    void addDiff( const std::string &diff );
+    bool compareMesh( aiMesh *expected, aiMesh *toCompare );
+    bool compareFace( aiFace *expected, aiFace *toCompare );
+    bool compareMaterial( aiMaterial *expected, aiMaterial *toCompare );
+
+private:
+    std::vector<std::string> m_diffs;
+};
+
+}

vendor/assimp/test/unit/TestIOStream.h

@@ -0,0 +1,51 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+#pragma once
+
+#include <assimp/DefaultIOStream.h>
+
+using namespace ::Assimp;
+
+class TestDefaultIOStream final : public DefaultIOStream {
+public:
+    TestDefaultIOStream() = default;
+    TestDefaultIOStream(FILE* pFile, const std::string &strFilename) : DefaultIOStream(pFile, strFilename) {}
+    ~TestDefaultIOStream() override = default;
+};

vendor/assimp/test/unit/TestIOSystem.h

@@ -0,0 +1,83 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+
+#include "UnitTestPCH.h"
+
+#include <assimp/IOSystem.hpp>
+
+using namespace std;
+
+namespace Assimp {
+
+static const string Sep = "/";
+
+class TestIOSystem : public IOSystem {
+public:
+    TestIOSystem()
+    : IOSystem() {
+        // empty
+    }
+
+    virtual ~TestIOSystem() {
+        // empty
+    }
+
+    virtual bool Exists( const char* ) const {
+        return true;
+    }
+
+    virtual char getOsSeparator() const {
+        return Sep[ 0 ];
+    }
+
+    virtual IOStream* Open( const char* pFile, const char* pMode = "rb" ) {
+        EXPECT_NE( nullptr, pFile );
+        EXPECT_NE( nullptr, pMode );
+        return nullptr;
+    }
+
+    virtual void Close( IOStream* pFile ) {
+        EXPECT_NE( nullptr, pFile );
+    }
+};
+
+} // Namespace Assimp

vendor/assimp/test/unit/TestModelFactory.h

@@ -0,0 +1,99 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+
+#include "UnitTestPCH.h"
+#include <assimp/scene.h>
+#include <assimp/mesh.h>
+#include <assimp/material.h>
+
+namespace Assimp {
+
+class TestModelFactory {
+public:
+    TestModelFactory() = default;
+
+    ~TestModelFactory() = default;
+
+    static aiScene *createDefaultTestModel( float &opacity ) {
+        auto *scene = new aiScene;
+        scene->mNumMaterials = 1;
+        scene->mMaterials = new aiMaterial*[scene->mNumMaterials];
+        scene->mMaterials[ 0 ] = new aiMaterial;
+        aiColor3D color( 1, 0, 0 );
+        EXPECT_EQ( AI_SUCCESS, scene->mMaterials[ 0 ]->AddProperty( &color, 1, AI_MATKEY_COLOR_DIFFUSE ) );
+
+        ::srand(static_cast<unsigned int>(::time(nullptr)));
+        opacity = float( rand() ) / float( RAND_MAX );
+        EXPECT_EQ( AI_SUCCESS, scene->mMaterials[ 0 ]->AddProperty( &opacity, 1, AI_MATKEY_OPACITY ) );
+
+        scene->mNumMeshes = 1;
+        scene->mMeshes = new aiMesh*[scene->mNumMeshes];
+        scene->mMeshes[ 0 ] = new aiMesh;
+        scene->mMeshes[ 0 ]->mMaterialIndex = 0;
+        scene->mMeshes[ 0 ]->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
+        scene->mMeshes[ 0 ]->mNumVertices = 3;
+        scene->mMeshes[ 0 ]->mVertices = new aiVector3D[ 3 ];
+        scene->mMeshes[ 0 ]->mVertices[ 0 ] = aiVector3D( 1, 0, 0 );
+        scene->mMeshes[ 0 ]->mVertices[ 1 ] = aiVector3D( 0, 1, 0 );
+        scene->mMeshes[ 0 ]->mVertices[ 2 ] = aiVector3D( 0, 0, 1 );
+        scene->mMeshes[ 0 ]->mNumFaces = 1;
+        scene->mMeshes[ 0 ]->mFaces = new aiFace[scene->mMeshes[ 0 ]->mNumFaces];
+        scene->mMeshes[ 0 ]->mFaces[ 0 ].mNumIndices = 3;
+        scene->mMeshes[ 0 ]->mFaces[ 0 ].mIndices = new unsigned int[ 3 ];
+        scene->mMeshes[ 0 ]->mFaces[ 0 ].mIndices[ 0 ] = 0;
+        scene->mMeshes[ 0 ]->mFaces[ 0 ].mIndices[ 1 ] = 1;
+        scene->mMeshes[ 0 ]->mFaces[ 0 ].mIndices[ 2 ] = 2;
+
+        scene->mRootNode = new aiNode;
+        scene->mRootNode->mNumMeshes = 1;
+        scene->mRootNode->mMeshes = new unsigned int[1]{ 0 };
+
+        return scene;
+    }
+
+    static void releaseDefaultTestModel( aiScene **scene ) {
+        delete *scene;
+        *scene = nullptr;
+    }
+};
+
+}

vendor/assimp/test/unit/Tools/TestTools.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <gtest/gtest.h>
+#include <cstdio>
+#include <string>
+
+namespace Assimp::Unittest {
+
+    class TestTools final {
+    public:
+        TestTools() = default;
+        ~TestTools() = default;
+        static bool openFilestream(FILE **pFile, const char *filename, const char *mode);
+    };
+
+    inline bool TestTools::openFilestream(FILE **fs, const char *filename, const char *mode) {
+#if defined(_WIN32)
+        errno_t err{ 0 };
+        err = fopen_s(fs, filename, mode);
+        EXPECT_EQ(err, 0);
+#else
+        *fs = fopen(filename, mode);
+#endif
+        return fs != nullptr;
+    }
+
+} // namespace Assimp::Unittest

vendor/assimp/test/unit/UTLogStream.h

@@ -0,0 +1,63 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+
+#include <assimp/LogStream.hpp>
+
+class UTLogStream : public Assimp::LogStream {
+public:
+    UTLogStream()
+    : LogStream() {
+        // empty
+    }
+
+    virtual ~UTLogStream() {
+        // empty
+    }
+
+    virtual void write(const char* message) {
+        if ( nullptr != message ) {
+            m_messages.emplace_back(message);
+        }
+    }
+
+    std::vector<std::string> m_messages;
+};

vendor/assimp/test/unit/UnitTestFileGenerator.h

@@ -0,0 +1,98 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2024, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+#ifdef _WIN32
+#  ifndef _CRT_NONSTDC_NO_DEPRECATE
+#    define _CRT_NONSTDC_NO_DEPRECATE
+#  endif // _CRT_NONSTDC_NO_DEPRECATE
+#  ifndef _CRT_SECURE_NO_WARNINGS
+#     define _CRT_SECURE_NO_WARNINGS
+#  endif
+#endif
+
+#include <cstdio>
+#include <cstdlib>
+#include <gtest/gtest.h>
+
+#if defined(_MSC_VER) || defined(__MINGW64__) || defined(__MINGW32__)
+#   define TMP_PATH "./"
+#elif defined(__GNUC__) || defined(__clang__)
+#   define TMP_PATH "/var/tmp/"
+#endif
+
+#if defined(_MSC_VER)
+
+#include <io.h>
+inline FILE* MakeTmpFile(char* tmplate, size_t len, std::string &tmpName) {
+    size_t tmpLen = len + 1;
+    char *pathtemplate = new char[tmpLen];
+    strcpy_s(pathtemplate, tmpLen, tmplate);
+    int err_code = _mktemp_s(pathtemplate, tmpLen);
+    EXPECT_EQ(err_code, 0);
+    EXPECT_NE(pathtemplate, nullptr);
+    if(pathtemplate == nullptr) {
+        delete[] pathtemplate;
+        return nullptr;
+    }
+    errno_t err;
+    FILE *fs{nullptr};
+    err = fopen_s(&fs, pathtemplate, "w+");
+    EXPECT_EQ(0, err);
+    tmpName = pathtemplate;
+    EXPECT_NE(fs, nullptr);
+    delete[] pathtemplate;
+
+    return fs;
+}
+#elif defined(__GNUC__) || defined(__clang__)
+inline FILE *MakeTmpFile(char *tmplate, size_t len, std::string &tmpName) {
+    auto fd = mkstemp(tmplate);
+    EXPECT_NE(-1, fd);
+    if(fd == -1) {
+        return nullptr;
+    }
+    auto fs = fdopen(fd, "w+");
+    EXPECT_NE(nullptr, fs);
+    tmpName += tmplate;
+
+    return fs;
+}
+#endif

vendor/assimp/test/unit/UnitTestPCH.h

@@ -0,0 +1,59 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#pragma once
+
+// We need to be sure to have the same STL settings as Assimp
+
+#include <assimp/cimport.h>
+#ifdef _MSC_VER
+#  pragma warning(push)
+#  pragma warning(disable : 4389)
+#endif
+#include <gtest/gtest.h>
+#ifdef _MSC_VER
+#  pragma warning(pop)
+#endif
+#include <memory>
+#include <math.h>
+#include "UTLogStream.h"
+
+#undef min
+#undef max

vendor/assimp/test/unit/ut3DImportExport.cpp

@@ -0,0 +1,88 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/Importer.hpp>
+#include <assimp/postprocess.h>
+
+using namespace Assimp;
+
+TEST(ut3DImportExport, importBoxA) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3D/box_a.3d", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST(ut3DImportExport, importBoxD) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3D/box_d.3d", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST(ut3DImportExport, importBoxUC) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3D/box.uc", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST(ut3DImportExport, importMarRifle) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3D/mar_rifle.uc", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST(ut3DImportExport, importMarRifleA) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3D/mar_rifle_a.3d", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST(ut3DImportExport, importMarRifleD) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3D/mar_rifle_d.3d", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/ut3DSImportExport.cpp

@@ -0,0 +1,184 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class ut3DSImportExport : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/fels.3ds", aiProcess_ValidateDataStructure);
+#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER
+        return nullptr != scene;
+#else
+        return nullptr == scene;
+#endif // ASSIMP_BUILD_NO_3DS_IMPORTER
+    }
+};
+
+TEST_F(ut3DSImportExport, import3DSFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(ut3DSImportExport, import3DSformatdetection) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/testFormatDetection", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importCameraRollAnim) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/CameraRollAnim.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importCameraRollAnimWithChildObject) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/CameraRollAnimWithChildObject.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importCubesWithAlpha) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/cubes_with_alpha.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importCubeWithDiffuseTexture) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/cube_with_diffuse_texture.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importCubeWithSpecularTexture) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/cube_with_specular_texture.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importRotatingCube) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/RotatingCube.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importTargetCameraAnim) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/TargetCameraAnim.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importTest1) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3DS/test1.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importCartWheel) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3DS/cart_wheel.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importGranate) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3DS/Granate.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importJeep1) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3DS/jeep1.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importMarRifle) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3DS/mar_rifle.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importMp5Sil) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3DS/mp5_sil.3ds", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(ut3DSImportExport, importPyramob) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/3DS/pyramob.3DS", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utACImportExport.cpp

@@ -0,0 +1,154 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+
+
+using namespace Assimp;
+
+TEST(utACImportExport, importClosedLine) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/closedLine.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importNoSurfaces) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/nosurfaces.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importOpenLine) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/openLine.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importSampleSubdiv) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/sample_subdiv.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+
+    // check approximate shape by averaging together all vertices
+    ASSERT_EQ(scene->mNumMeshes, 1u);
+    aiVector3D vertexAvg(0.0, 0.0, 0.0);
+    for (unsigned int i = 0; i < scene->mNumMeshes; i++) {
+        const aiMesh *mesh = scene->mMeshes[i];
+        ASSERT_NE(mesh, nullptr);
+
+        ai_real invVertexCount = 1.0 / mesh->mNumVertices;
+        for (unsigned int j = 0; j < mesh->mNumVertices; j++) {
+            vertexAvg += mesh->mVertices[j] * invVertexCount;
+        }
+    }
+
+    // must not be inf or nan
+    ASSERT_TRUE(std::isfinite(vertexAvg.x));
+    ASSERT_TRUE(std::isfinite(vertexAvg.y));
+    ASSERT_TRUE(std::isfinite(vertexAvg.z));
+    EXPECT_NEAR(vertexAvg.x, 0.079997420310974121, 0.0001);
+    EXPECT_NEAR(vertexAvg.y, 0.099498569965362549, 0.0001);
+    EXPECT_NEAR(vertexAvg.z, -0.10344827175140381, 0.0001);
+}
+
+TEST(utACImportExport, importSphereWithLight) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/SphereWithLight.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importSphereWithLightACC) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/SphereWithLight.acc", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importSphereWithLightUTF16) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/SphereWithLight_UTF16LE.ac", aiProcess_ValidateDataStructure);
+    // FIXME: this is probably wrong, loading the file should succeed
+    ASSERT_EQ(nullptr, scene);
+}
+
+TEST(utACImportExport, importSphereWithLightUTF8BOM) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/SphereWithLight_UTF8BOM.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importSphereWithLightUvScaling4X) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/SphereWithLightUvScaling4X.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importWuson) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/Wuson.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importWusonACC) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/Wuson.acc", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, testFormatDetection) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/TestFormatDetection", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utACImportExport, importDobuleSidedFaces) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AC/doubleSidedFace.ac", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+    // The scene contains one double-sided, rectangular AC surface. It should resolve to two quads (front + back) with eight
+    // vertices (one per side to guarantee proper normal vectors).
+    ASSERT_EQ(scene->mNumMeshes, 1u);
+    ASSERT_EQ(scene->mMeshes[0]->mNumFaces, 2u);
+    ASSERT_EQ(scene->mMeshes[0]->mNumVertices, 8u);
+}

vendor/assimp/test/unit/utAMFImportExport.cpp

@@ -0,0 +1,142 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utAMFImportExport : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test1.amf", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utAMFImportExport, importAMFFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+
+// TODO: test models-nonbsd/AMF/3_bananas.amf.7z
+//       requires uncompressing it in memory and we don't currently have 7z decompressor
+
+
+TEST_F(utAMFImportExport, importTest2) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test2.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest3) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test3.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest4) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test4.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest5) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test5.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest5a) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test5a.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest6) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test6.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest7) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test7.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+#if 0
+// FIXME: these tests are disabled because they leak memory in AMFImporter_Postprocess.cpp
+
+
+TEST_F(utAMFImportExport, importTest8) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test8.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utAMFImportExport, importTest9) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test9.amf", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+#endif  // 0
+
+
+TEST_F(utAMFImportExport, importAMFWithMatFromFileTest) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/AMF/test_with_mat.amf", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utASEImportExport.cpp

@@ -0,0 +1,175 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+
+using namespace Assimp;
+
+class utASEImportExport : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/ThreeCubesGreen.ASE", aiProcess_ValidateDataStructure);
+#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER
+        return nullptr != scene;
+#else
+        return nullptr == scene;
+#endif // ASSIMP_BUILD_NO_3DS_IMPORTER
+    }
+};
+
+TEST_F(utASEImportExport, importACFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+
+TEST_F(utASEImportExport, importAnim1) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/anim.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importAnim2) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/anim2.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importCameraRollAnim) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/CameraRollAnim.ase", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importMotionCaptureROM) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/MotionCaptureROM.ase", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importRotatingCube) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/RotatingCube.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importTargetCameraAnim) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/TargetCameraAnim.ase", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importTestFormatDetection) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/TestFormatDetection", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importThreeCubesGreen) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/ThreeCubesGreen.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+
+    ::Assimp::Importer importerLE;
+    const aiScene *sceneLE = importerLE.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/ThreeCubesGreen_UTF16LE.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, sceneLE);
+
+    ::Assimp::Importer importerBE;
+    const aiScene *sceneBE = importerBE.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/ThreeCubesGreen_UTF16BE.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, sceneBE);
+
+    // TODO: these scenes should probably be identical
+    // verify that is the case and then add tests to check it
+}
+
+
+TEST_F(utASEImportExport, importUVTransform_Normal) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/TestUVTransform/UVTransform_Normal.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importUVTransform_ScaleUV1_2_OffsetUV0_0_9_Rotate_72_mirrorU) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/TestUVTransform/UVTransform_ScaleUV1-2_OffsetUV0-0.9_Rotate-72_mirrorU.ase", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importUVTransform_ScaleUV2x) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/TestUVTransform/UVTransform_ScaleUV2x.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utASEImportExport, importUVTransform_ScaleUV2x_Rotate45) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/ASE/TestUVTransform/UVTransform_ScaleUV2x_Rotate45.ASE", aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utAnim.cpp

@@ -0,0 +1,107 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/anim.h>
+
+using namespace Assimp;
+
+class utAnim : public ::testing::Test {
+    // empty
+};
+
+TEST_F( utAnim, aiVectorKeyCreationTest ) {
+    aiVectorKey defaultConstTest;
+    EXPECT_DOUBLE_EQ( 0.0, defaultConstTest.mTime );
+
+    aiVector3D v( 1, 2, 3 );
+    aiVectorKey constrWithValuesTest( 1, v );
+    EXPECT_DOUBLE_EQ( 1.0, constrWithValuesTest.mTime );
+    EXPECT_EQ( v, constrWithValuesTest.mValue );
+
+    EXPECT_NE( defaultConstTest, constrWithValuesTest );
+    EXPECT_TRUE( defaultConstTest != constrWithValuesTest );
+    defaultConstTest.mTime = 1;
+    constrWithValuesTest.mTime = 2;
+    EXPECT_TRUE( defaultConstTest < constrWithValuesTest );
+}
+
+TEST_F( utAnim, aiQuatKeyTest ) {
+    aiQuatKey defaultConstrTest;
+    EXPECT_DOUBLE_EQ( 0.0, defaultConstrTest.mTime );
+
+    aiQuaternion q;
+    aiQuatKey constrWithValuesTest( 1.0, q );
+    EXPECT_DOUBLE_EQ( 1.0, constrWithValuesTest.mTime );
+    EXPECT_EQ( q, constrWithValuesTest.mValue );
+}
+
+TEST_F( utAnim, aiNodeAnimTest ) {
+    bool ok( true );
+    try {
+        aiNodeAnim myAnim;
+        EXPECT_EQ( aiAnimBehaviour_DEFAULT, myAnim.mPreState );
+        EXPECT_EQ( aiAnimBehaviour_DEFAULT, myAnim.mPostState );
+    } catch ( ... ) {
+        ok = false;
+    }
+    EXPECT_TRUE( ok );
+}
+
+TEST_F( utAnim, aiMeshAnimTest ) {
+    bool ok( true );
+    try {
+        aiMeshAnim myMeshAnim;
+    } catch ( ... ) {
+        ok = false;
+    }
+    EXPECT_TRUE( ok );
+}
+
+TEST_F( utAnim, aiAnimationTest ) {
+    bool ok( true );
+    try {
+        aiAnimation myAnimation;
+    } catch ( ... ) {
+        ok = false;
+    }
+    EXPECT_TRUE( ok );
+}

vendor/assimp/test/unit/utArmaturePopulate.cpp

@@ -0,0 +1,79 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "TestModelFactory.h"
+#include "UnitTestPCH.h"
+
+#include "AbstractImportExportBase.h"
+
+#include <assimp/material.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/types.h>
+#include <assimp/Importer.hpp>
+
+#include "PostProcessing/ArmaturePopulate.h"
+
+namespace Assimp {
+namespace UnitTest {
+
+class utArmaturePopulate : public ::testing::Test {
+    // empty
+};
+
+TEST_F(utArmaturePopulate, importCheckForArmatureTest) {
+    Assimp::Importer importer;
+    unsigned int mask = aiProcess_PopulateArmatureData | aiProcess_ValidateDataStructure;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/huesitos.fbx", mask);
+    EXPECT_NE(nullptr, scene);
+    EXPECT_EQ(scene->mNumMeshes, 1u);
+    aiMesh *mesh = scene->mMeshes[0];
+    EXPECT_EQ(mesh->mNumFaces, 68u);
+    EXPECT_EQ(mesh->mNumVertices, 256u);
+    EXPECT_GT(mesh->mNumBones, 0u);
+
+    aiBone *exampleBone = mesh->mBones[0];
+    EXPECT_NE(exampleBone, nullptr);
+    EXPECT_NE(exampleBone->mArmature, nullptr);
+    EXPECT_NE(exampleBone->mNode, nullptr);
+}
+
+} // Namespace UnitTest
+} // Namespace Assimp

vendor/assimp/test/unit/utAssbinImportExport.cpp

@@ -0,0 +1,69 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+class utAssbinImportExport : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/spider.obj", aiProcess_ValidateDataStructure);
+
+        Exporter exporter;
+        EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "assbin", ASSIMP_TEST_MODELS_DIR "/OBJ/spider_out.assbin"));
+        const aiScene *newScene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/spider_out.assbin", aiProcess_ValidateDataStructure);
+
+        return newScene != nullptr;
+    }
+};
+
+TEST_F(utAssbinImportExport, import3ExportAssbinDFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+#endif // #ifndef ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/utB3DImportExport.cpp

@@ -0,0 +1,61 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utB3DImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/B3D/WusonBlitz.b3d", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utB3DImportExport, importB3DFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/utBVHImportExport.cpp

@@ -0,0 +1,74 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utBVHImportExport : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BVH/01_01.bvh", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utBVHImportExport, import01_01) {
+    EXPECT_TRUE(importerTest());
+}
+
+
+TEST_F(utBVHImportExport, import01_03) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BVH/01_03.bvh", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+
+TEST_F(utBVHImportExport, importBoxingToes) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BVH/Boxing_Toes.bvh", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utBatchLoader.cpp

@@ -0,0 +1,81 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "Common/Importer.h"
+#include "TestIOSystem.h"
+
+using namespace ::Assimp;
+
+class BatchLoaderTest : public ::testing::Test {
+public:
+    virtual void SetUp() {
+        m_io = new TestIOSystem();
+    }
+
+    virtual void TearDown() {
+        delete m_io;
+    }
+
+protected:
+    TestIOSystem* m_io;
+};
+
+TEST_F( BatchLoaderTest, createTest ) {
+    bool ok( true );
+    try {
+        BatchLoader loader( m_io );
+    } catch ( ... ) {
+        ok = false;
+    }
+    EXPECT_TRUE( ok );
+}
+
+TEST_F( BatchLoaderTest, validateAccessTest ) {
+    BatchLoader loader1( m_io );
+    EXPECT_FALSE( loader1.getValidation() );
+    loader1.setValidation( true );
+    EXPECT_TRUE( loader1.getValidation() );
+
+    BatchLoader loader2( m_io, true );
+    EXPECT_TRUE( loader2.getValidation() );
+}

vendor/assimp/test/unit/utBlendImportAreaLight.cpp

@@ -0,0 +1,112 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/cexport.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+class BlendImportAreaLight : public ::testing::Test {
+public:
+    BlendImportAreaLight() :
+            im(nullptr) {}
+    ~BlendImportAreaLight() override = default;
+    void SetUp() override {
+        im = new Assimp::Importer();
+    }
+
+    void TearDown() override {
+        delete im;
+    }
+
+protected:
+    Assimp::Importer *im;
+};
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(BlendImportAreaLight, testImportLight) {
+    const aiScene *pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/AreaLight_269.blend", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(pTest != nullptr);
+    ASSERT_TRUE(pTest->HasLights());
+
+    std::vector<std::pair<std::string, size_t>> lightNames;
+
+    for (size_t i = 0; i < pTest->mNumLights; i++) {
+        lightNames.emplace_back(pTest->mLights[i]->mName.C_Str(), i);
+    }
+
+    std::sort(lightNames.begin(), lightNames.end());
+
+    std::vector<aiLight> lights;
+
+    for (size_t i = 0; i < pTest->mNumLights; ++i) {
+        lights.push_back(*pTest->mLights[lightNames[i].second]);
+    }
+
+    ASSERT_STREQ(lights[0].mName.C_Str(), "Bar");
+    ASSERT_STREQ(lights[1].mName.C_Str(), "Baz");
+    ASSERT_STREQ(lights[2].mName.C_Str(), "Foo");
+
+    ASSERT_EQ(lights[0].mType, aiLightSource_AREA);
+    ASSERT_EQ(lights[1].mType, aiLightSource_POINT);
+    ASSERT_EQ(lights[2].mType, aiLightSource_AREA);
+
+    EXPECT_FLOAT_EQ(lights[0].mSize.x, 0.5f);
+    EXPECT_FLOAT_EQ(lights[0].mSize.y, 2.0f);
+    EXPECT_FLOAT_EQ(lights[2].mSize.x, 1.0f);
+    EXPECT_FLOAT_EQ(lights[2].mSize.y, 1.0f);
+
+    EXPECT_FLOAT_EQ(lights[0].mColorDiffuse.r, 42.0f);
+    EXPECT_FLOAT_EQ(lights[0].mColorDiffuse.g, 42.0f);
+    EXPECT_FLOAT_EQ(lights[0].mColorDiffuse.b, 42.0f);
+    EXPECT_FLOAT_EQ(lights[2].mColorDiffuse.r, 1.0f);
+    EXPECT_FLOAT_EQ(lights[2].mColorDiffuse.g, 1.0f);
+    EXPECT_FLOAT_EQ(lights[2].mColorDiffuse.b, 1.0f);
+
+    EXPECT_FLOAT_EQ(lights[0].mDirection.x, 0.0f);
+    EXPECT_FLOAT_EQ(lights[0].mDirection.y, 0.0f);
+    EXPECT_FLOAT_EQ(lights[0].mDirection.z, -1.0f);
+    EXPECT_FLOAT_EQ(lights[2].mDirection.x, 0.0f);
+    EXPECT_FLOAT_EQ(lights[2].mDirection.y, 0.0f);
+    EXPECT_FLOAT_EQ(lights[2].mDirection.z, -1.0f);
+}

vendor/assimp/test/unit/utBlendImportMaterials.cpp

@@ -0,0 +1,146 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/cexport.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+class BlendImportMaterials : public ::testing::Test {
+public:
+    void SetUp() override {
+        im = new Assimp::Importer();
+    }
+
+    void TearDown() override {
+        delete im;
+    }
+
+protected:
+    Assimp::Importer *im;
+};
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(BlendImportMaterials, testImportMaterial) {
+    const aiScene *pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderMaterial_269.blend", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(pTest != nullptr);
+    ASSERT_TRUE(pTest->HasMaterials());
+
+    ASSERT_EQ(1U, pTest->mNumMaterials);
+
+    auto alpha = pTest->mMaterials[0];
+
+#define ASSERT_PROPERTY_EQ(expected, key, var)                             \
+    auto var = expected;                                                   \
+    ASSERT_EQ(aiReturn_SUCCESS, alpha->Get("$mat.blend." key, 0, 0, var)); \
+    ASSERT_EQ(expected, var);
+
+#define ASSERT_PROPERTY_FLOAT_EQ(expected, key, var)                       \
+    auto var = expected;                                                   \
+    ASSERT_EQ(aiReturn_SUCCESS, alpha->Get("$mat.blend." key, 0, 0, var)); \
+    ASSERT_FLOAT_EQ(expected, var);
+
+    ASSERT_PROPERTY_EQ(aiColor3D(0.1f, 0.2f, 0.3f), "diffuse.color", diffuseColor);
+    ASSERT_PROPERTY_EQ(0.4f, "diffuse.intensity", diffuseIntensity);
+    ASSERT_PROPERTY_EQ(1, "diffuse.shader", diffuseShader);
+    ASSERT_PROPERTY_EQ(0, "diffuse.ramp", diffuseRamp);
+
+    ASSERT_PROPERTY_EQ(aiColor3D(0.5f, 0.6f, 0.7f), "specular.color", specularColor);
+    ASSERT_PROPERTY_EQ(0.8f, "specular.intensity", specularIntensity);
+    ASSERT_PROPERTY_EQ(1, "specular.shader", specularShader);
+    ASSERT_PROPERTY_EQ(0, "specular.ramp", specularRamp);
+    ASSERT_PROPERTY_EQ(9, "specular.hardness", specularHardness);
+
+    ASSERT_PROPERTY_EQ(1, "transparency.use", transparencyUse);
+    ASSERT_PROPERTY_EQ(2, "transparency.method", transparencyMethod);
+    ASSERT_PROPERTY_EQ(0.01f, "transparency.alpha", transparencyAlpha);
+    ASSERT_PROPERTY_EQ(0.02f, "transparency.specular", transparencySpecular);
+    ASSERT_PROPERTY_EQ(0.03f, "transparency.fresnel", transparencyFresnel);
+    ASSERT_PROPERTY_EQ(3.14f, "transparency.blend", transparencyBlend);
+    ASSERT_PROPERTY_EQ(0.85f, "transparency.ior", transparencyIor);
+    ASSERT_PROPERTY_FLOAT_EQ(0.128f, "transparency.filter", transparencyFilter);
+    ASSERT_PROPERTY_FLOAT_EQ(1.298f, "transparency.falloff", transparencyFalloff);
+    ASSERT_PROPERTY_FLOAT_EQ(0.2376f, "transparency.limit", transparencyLimit);
+    ASSERT_PROPERTY_EQ(7, "transparency.depth", transparencyDepth);
+    ASSERT_PROPERTY_FLOAT_EQ(0.678f, "transparency.glossAmount", transparencyGlossAmount);
+    ASSERT_PROPERTY_FLOAT_EQ(0.208f, "transparency.glossThreshold", transparencyGlossThreshold);
+    ASSERT_PROPERTY_EQ(17, "transparency.glossSamples", transparencyGlossSamples);
+
+    ASSERT_PROPERTY_EQ(1, "mirror.use", mirrorUse);
+    ASSERT_PROPERTY_FLOAT_EQ(0.28f, "mirror.reflectivity", mirrorReflectivity);
+    ASSERT_PROPERTY_EQ(aiColor3D(0.25f, 0.5f, 0.128f), "mirror.color", mirrorColor);
+    ASSERT_PROPERTY_FLOAT_EQ(0.256f, "mirror.fresnel", mirrorFresnel);
+    ASSERT_PROPERTY_FLOAT_EQ(1.61f, "mirror.blend", mirrorBlend);
+    ASSERT_PROPERTY_EQ(12, "mirror.depth", mirrorDepth);
+    ASSERT_PROPERTY_FLOAT_EQ(0.4f, "mirror.maxDist", mirrorMaxDist);
+    ASSERT_PROPERTY_EQ(1, "mirror.fadeTo", mirrorFadeTo);
+    ASSERT_PROPERTY_FLOAT_EQ(0.512f, "mirror.glossAmount", mirrorGlossAmount);
+    ASSERT_PROPERTY_FLOAT_EQ(0.18f, "mirror.glossThreshold", mirrorGlossThreshold);
+    ASSERT_PROPERTY_EQ(61, "mirror.glossSamples", mirrorGlossSamples);
+    ASSERT_PROPERTY_FLOAT_EQ(0.87f, "mirror.glossAnisotropic", mirrorGlossAnisotropic);
+}
+
+TEST_F(BlendImportMaterials, testImportMaterialwith2texturesAnd2TexCoordMappings) {
+    const aiScene *pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/plane_2_textures_2_texcoords_279.blend", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(pTest != nullptr);
+
+    // material has 2 diffuse textures
+    ASSERT_TRUE(pTest->HasMaterials());
+    EXPECT_EQ(1u, pTest->mNumMaterials);
+    const aiMaterial *pMat = pTest->mMaterials[0];
+    ASSERT_TRUE(nullptr != pMat);
+    ASSERT_EQ(2u, pMat->GetTextureCount(aiTextureType_DIFFUSE));
+    aiString aPath;
+    aiTextureMapping tm = aiTextureMapping::aiTextureMapping_OTHER;
+    aiReturn result = pMat->GetTexture(aiTextureType_DIFFUSE, 0, &aPath, &tm);
+    ASSERT_EQ(aiReturn_SUCCESS, result);
+    result = pMat->GetTexture(aiTextureType_DIFFUSE, 1, &aPath, &tm);
+    ASSERT_EQ(aiReturn_SUCCESS, result);
+
+    // mesh has 2 texturecoord sets
+    ASSERT_TRUE(pTest->HasMeshes());
+    EXPECT_EQ(1u, pTest->mNumMeshes);
+    const aiMesh *pMesh = pTest->mMeshes[0];
+    ASSERT_TRUE(nullptr != pMesh);
+    ASSERT_TRUE(pMesh->HasTextureCoords(0));
+    ASSERT_TRUE(pMesh->HasTextureCoords(1));
+}

vendor/assimp/test/unit/utBlenderImportExport.cpp

@@ -0,0 +1,244 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+#include <assimp/SpatialSort.h>
+
+using namespace Assimp;
+
+class utBlenderImporterExporter : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/box.blend", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utBlenderImporterExporter, importBlenFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST(utBlenderImporter, import4cubes) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/4Cubes4Mats_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, import269_regress1) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/blender_269_regress1.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault250) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_250.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault250Compressed) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_250_Compressed.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault262) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_262.blend", aiProcess_ValidateDataStructure);
+    // FIXME: this is probably not right, loading this should succeed
+    ASSERT_EQ(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault269) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_269.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault271) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_271.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBlenderDefault293) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/BlenderDefault_276.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importCubeHierarchy_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/CubeHierarchy_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importHuman) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/HUMAN.blend", aiProcess_ValidateDataStructure);
+	ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importMirroredCube_252) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/MirroredCube_252.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importNoisyTexturedCube_VoronoiGlob_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/NoisyTexturedCube_VoronoiGlob_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importSmoothVsSolidCube_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/SmoothVsSolidCube_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importSuzanne_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/Suzanne_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importSuzanneSubdiv_252) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/SuzanneSubdiv_252.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+
+    // check approximate shape by averaging together all vertices
+    ASSERT_EQ(scene->mNumMeshes, 1u);
+    aiVector3D vertexAvg(0.0, 0.0, 0.0);
+    for (unsigned int i = 0; i < scene->mNumMeshes; i++) {
+        const aiMesh *mesh = scene->mMeshes[i];
+        ASSERT_NE(mesh, nullptr);
+
+        ai_real invVertexCount = 1.0 / mesh->mNumVertices;
+        for (unsigned int j = 0; j < mesh->mNumVertices; j++) {
+            vertexAvg += mesh->mVertices[j] * invVertexCount;
+        }
+    }
+
+    // must not be inf or nan
+    ASSERT_TRUE(std::isfinite(vertexAvg.x));
+    ASSERT_TRUE(std::isfinite(vertexAvg.y));
+    ASSERT_TRUE(std::isfinite(vertexAvg.z));
+    EXPECT_NEAR(vertexAvg.x, 6.4022515289252624e-08, 0.0001);
+    EXPECT_NEAR(vertexAvg.y, 0.060569953173398972, 0.0001);
+    EXPECT_NEAR(vertexAvg.z, 0.31429031491279602, 0.0001);
+}
+
+TEST(utBlenderImporter, importTexturedCube_ImageGlob_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/TexturedCube_ImageGlob_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importTexturedPlane_ImageUv_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/TexturedPlane_ImageUv_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importTexturedPlane_ImageUvPacked_248) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/TexturedPlane_ImageUvPacked_248.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importTorusLightsCams_250_compressed) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/TorusLightsCams_250_compressed.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, import_yxa_1) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/yxa_1.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importBob) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/BLEND/Bob.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+TEST(utBlenderImporter, importFleurOptonl) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/BLEND/fleurOptonl.blend", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+}
+
+/// This test contains a default cube with subdivision surface modifier and a default cube with subdivision surface applied.
+/// Vertices should be identical.
+TEST_F(utBlenderImporterExporter, importBlendWithSubdivisionSurface) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/subdivision_test_277.blend", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+    EXPECT_EQ(scene->mNumMeshes, 2u);
+    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, scene->mMeshes[1]->mNumVertices);
+
+    SpatialSort spatialSortVertices0;
+    spatialSortVertices0.Fill(scene->mMeshes[0]->mVertices, scene->mMeshes[0]->mNumVertices, sizeof(aiVector3D), true);
+
+    for (unsigned int i = 0; i < scene->mMeshes[1]->mNumVertices; ++i)
+    {
+        auto positionMesh1 = scene->mMeshes[1]->mVertices[i];
+        std::vector<unsigned int> spatialSortResult;
+        spatialSortVertices0.FindPositions(positionMesh1, 1.0e-6f, spatialSortResult);
+
+        EXPECT_TRUE(scene->mMeshes[0]->mVertices[spatialSortResult[0]].Equal(positionMesh1));
+    }
+}

vendor/assimp/test/unit/utBlenderIntermediate.cpp

@@ -0,0 +1,78 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "AssetLib/Blender/BlenderIntermediate.h"
+#include <assimp/camera.h>
+#include <assimp/light.h>
+#include <assimp/mesh.h>
+#include <assimp/texture.h>
+
+using namespace ::Assimp;
+using namespace ::Assimp::Blender;
+
+class BlenderIntermediateTest : public ::testing::Test {
+    // empty
+};
+
+#define NAME_1 "name1"
+#define NAME_2 "name2"
+
+// Updated this test after fixing #1776:
+// A comparator in C++ is used for ordering and must implement strict weak ordering,
+// which means it must return false for equal values.
+// The C++ standard defines and expects this behavior: true if lhs < rhs, false otherwise.
+TEST_F(BlenderIntermediateTest, ConversionData_ObjectCompareTest) {
+    Object obj1, obj2;
+    strncpy(obj1.id.name, NAME_1, sizeof(obj1.id.name));
+    strncpy(obj2.id.name, NAME_2, sizeof(obj2.id.name));
+
+    Blender::ObjectCompare cmp_true_because_first_is_smaller_than_second;
+    bool res(cmp_true_because_first_is_smaller_than_second(&obj1, &obj2));
+    EXPECT_TRUE(res);
+
+    Blender::ObjectCompare cmp_false_because_equal;
+    res = cmp_false_because_equal(&obj1, &obj1);
+    EXPECT_FALSE(res);
+
+    Blender::ObjectCompare cmp_false_because_first_is_greater_than_second;
+    res = cmp_false_because_first_is_greater_than_second(&obj2, &obj1);
+    EXPECT_FALSE(res);
+}

vendor/assimp/test/unit/utBlenderWork.cpp

@@ -0,0 +1,76 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include <assimp/cexport.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace ::Assimp;
+
+class BlenderWorkTest : public ::testing::Test {
+public:
+    BlenderWorkTest() : im(nullptr) {}
+    ~BlenderWorkTest() override = default;
+
+    void SetUp() override {
+        im = new Assimp::Importer();
+    }
+
+    void TearDown() override {
+        delete im;
+    }
+
+protected:
+    Assimp::Importer *im;
+};
+
+TEST_F(BlenderWorkTest, work_279) {
+    const aiScene *pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/BLEND/test_279.blend", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(pTest != nullptr);
+
+    // material has 2 diffuse textures
+    ASSERT_TRUE(pTest->HasMaterials());
+    ASSERT_TRUE(pTest->HasMeshes());
+    ASSERT_TRUE(pTest->mMeshes[0]->mNumVertices > 0);
+    ASSERT_EQ(44u, pTest->mMeshes[0]->mNumFaces);
+    EXPECT_EQ(1u, pTest->mNumMaterials);
+}

vendor/assimp/test/unit/utCSMImportExport.cpp

@@ -0,0 +1,60 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utCSMImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/CSM/ThomasFechten.csm", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utCSMImportExport, importBlenFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/utColladaExport.cpp

@@ -0,0 +1,231 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/cexport.h>
+#include <assimp/commonMetaData.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+#include <array>
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+class utColladaExport : public ::testing::Test {
+public:
+    void SetUp() override {
+        ex = new Assimp::Exporter();
+        im = new Assimp::Importer();
+    }
+
+    void TearDown() override {
+        delete ex;
+        ex = nullptr;
+        delete im;
+        im = nullptr;
+    }
+
+protected:
+    Assimp::Exporter *ex;
+    Assimp::Importer *im;
+};
+
+TEST_F(utColladaExport, testExportCamera) {
+    const char *file = "cameraExp.dae";
+
+    const aiScene *pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/cameras.dae", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, pTest);
+    ASSERT_TRUE(pTest->HasCameras());
+
+    EXPECT_EQ(AI_SUCCESS, ex->Export(pTest, "collada", file));
+    const unsigned int origNumCams(pTest->mNumCameras);
+
+    std::unique_ptr<float[]> origFOV(new float[origNumCams]);
+    std::unique_ptr<float[]> orifClipPlaneNear(new float[origNumCams]);
+    std::unique_ptr<float[]> orifClipPlaneFar(new float[origNumCams]);
+    std::unique_ptr<aiString[]> names(new aiString[origNumCams]);
+    std::unique_ptr<aiVector3D[]> pos(new aiVector3D[origNumCams]);
+    for (size_t i = 0; i < origNumCams; i++) {
+        const aiCamera *orig = pTest->mCameras[i];
+        ASSERT_NE(nullptr, orig);
+
+        origFOV[i] = orig->mHorizontalFOV;
+        orifClipPlaneNear[i] = orig->mClipPlaneNear;
+        orifClipPlaneFar[i] = orig->mClipPlaneFar;
+        names[i] = orig->mName;
+        pos[i] = orig->mPosition;
+    }
+    const aiScene *imported = im->ReadFile(file, aiProcess_ValidateDataStructure);
+
+    ASSERT_NE(nullptr, imported);
+
+    EXPECT_TRUE(imported->HasCameras());
+    EXPECT_EQ(origNumCams, imported->mNumCameras);
+
+    for (size_t i = 0; i < imported->mNumCameras; i++) {
+        const aiCamera *read = imported->mCameras[i];
+
+        EXPECT_TRUE(names[i] == read->mName);
+        EXPECT_NEAR(origFOV[i], read->mHorizontalFOV, 0.0001f);
+        EXPECT_FLOAT_EQ(orifClipPlaneNear[i], read->mClipPlaneNear);
+        EXPECT_FLOAT_EQ(orifClipPlaneFar[i], read->mClipPlaneFar);
+
+        EXPECT_FLOAT_EQ(pos[i].x, read->mPosition.x);
+        EXPECT_FLOAT_EQ(pos[i].y, read->mPosition.y);
+        EXPECT_FLOAT_EQ(pos[i].z, read->mPosition.z);
+    }
+
+    // Cleanup, delete the exported file
+    EXPECT_EQ(0, std::remove(file));
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(utColladaExport, testExportLight) {
+    const char *file = "lightsExp.dae";
+
+    const aiScene *pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/lights.dae", aiProcess_ValidateDataStructure);
+    ASSERT_NE(pTest, nullptr);
+    ASSERT_TRUE(pTest->HasLights());
+
+    const unsigned int origNumLights = pTest->mNumLights;
+    // There are FIVE!!! LIGHTS!!!
+    EXPECT_EQ(5u, origNumLights) << "lights.dae should contain five lights";
+
+    std::vector<aiLight> origLights(5);
+    for (size_t i = 0; i < origNumLights; i++) {
+        origLights[i] = *(pTest->mLights[i]);
+    }
+
+    // Check loaded first light properly
+    EXPECT_STREQ("Lamp", origLights[0].mName.C_Str());
+    EXPECT_EQ(aiLightSource_POINT, origLights[0].mType);
+    EXPECT_FLOAT_EQ(1.0f, origLights[0].mAttenuationConstant);
+    EXPECT_FLOAT_EQ(0.0f, origLights[0].mAttenuationLinear);
+    EXPECT_FLOAT_EQ(0.00111109f, origLights[0].mAttenuationQuadratic);
+
+    // Common metadata
+    // Confirm was loaded by the Collada importer
+    aiString origImporter;
+    EXPECT_TRUE(pTest->mMetaData->Get(AI_METADATA_SOURCE_FORMAT, origImporter)) << "No importer format metadata";
+    EXPECT_STREQ("Collada Importer", origImporter.C_Str());
+
+    aiString origGenerator;
+    EXPECT_TRUE(pTest->mMetaData->Get(AI_METADATA_SOURCE_GENERATOR, origGenerator)) << "No generator metadata";
+    EXPECT_EQ(strncmp(origGenerator.C_Str(), "Blender", 7), 0) << "AI_METADATA_SOURCE_GENERATOR was: " << origGenerator.C_Str();
+
+    aiString origCopyright;
+    EXPECT_TRUE(pTest->mMetaData->Get(AI_METADATA_SOURCE_COPYRIGHT, origCopyright)) << "No copyright metadata";
+    EXPECT_STREQ("BSD", origCopyright.C_Str());
+
+    aiString origCreated;
+    EXPECT_TRUE(pTest->mMetaData->Get("Created", origCreated)) << "No created metadata";
+    EXPECT_STREQ("2015-05-17T21:55:44", origCreated.C_Str());
+
+    aiString origModified;
+    EXPECT_TRUE(pTest->mMetaData->Get("Modified", origModified)) << "No modified metadata";
+    EXPECT_STREQ("2015-05-17T21:55:44", origModified.C_Str());
+
+    EXPECT_EQ(AI_SUCCESS, ex->Export(pTest, "collada", file));
+
+    // Drop the pointer as about to become invalid
+    pTest = nullptr;
+
+    const aiScene *imported = im->ReadFile(file, aiProcess_ValidateDataStructure);
+
+    ASSERT_TRUE(imported != nullptr);
+
+    // Check common metadata survived roundtrip
+    aiString readImporter;
+    EXPECT_TRUE(imported->mMetaData->Get(AI_METADATA_SOURCE_FORMAT, readImporter)) << "No importer format metadata after export";
+    EXPECT_STREQ(origImporter.C_Str(), readImporter.C_Str()) << "Assimp Importer Format changed";
+
+    aiString readGenerator;
+    EXPECT_TRUE(imported->mMetaData->Get(AI_METADATA_SOURCE_GENERATOR, readGenerator)) << "No generator metadata";
+    EXPECT_STREQ(origGenerator.C_Str(), readGenerator.C_Str()) << "Generator changed";
+
+    aiString readCopyright;
+    EXPECT_TRUE(imported->mMetaData->Get(AI_METADATA_SOURCE_COPYRIGHT, readCopyright)) << "No copyright metadata";
+    EXPECT_STREQ(origCopyright.C_Str(), readCopyright.C_Str()) << "Copyright changed";
+
+    aiString readCreated;
+    EXPECT_TRUE(imported->mMetaData->Get("Created", readCreated)) << "No created metadata";
+    EXPECT_STREQ(origCreated.C_Str(), readCreated.C_Str()) << "Created date changed";
+
+    aiString readModified;
+    EXPECT_TRUE(imported->mMetaData->Get("Modified", readModified)) << "No modified metadata";
+    EXPECT_STRNE(origModified.C_Str(), readModified.C_Str()) << "Modified date did not change";
+    EXPECT_GT(readModified.length, ai_uint32(18)) << "Modified date too short";
+
+    // Lights
+    EXPECT_TRUE(imported->HasLights());
+    EXPECT_EQ(origNumLights, imported->mNumLights);
+    for (size_t i = 0; i < origNumLights; i++) {
+        const aiLight *orig = &origLights[i];
+        const aiLight *read = imported->mLights[i];
+        EXPECT_EQ(0, strcmp(orig->mName.C_Str(), read->mName.C_Str()));
+        EXPECT_EQ(orig->mType, read->mType);
+        EXPECT_FLOAT_EQ(orig->mAttenuationConstant, read->mAttenuationConstant);
+        EXPECT_FLOAT_EQ(orig->mAttenuationLinear, read->mAttenuationLinear);
+        EXPECT_NEAR(orig->mAttenuationQuadratic, read->mAttenuationQuadratic, 0.001f);
+
+        EXPECT_FLOAT_EQ(orig->mColorAmbient.r, read->mColorAmbient.r);
+        EXPECT_FLOAT_EQ(orig->mColorAmbient.g, read->mColorAmbient.g);
+        EXPECT_FLOAT_EQ(orig->mColorAmbient.b, read->mColorAmbient.b);
+
+        EXPECT_FLOAT_EQ(orig->mColorDiffuse.r, read->mColorDiffuse.r);
+        EXPECT_FLOAT_EQ(orig->mColorDiffuse.g, read->mColorDiffuse.g);
+        EXPECT_FLOAT_EQ(orig->mColorDiffuse.b, read->mColorDiffuse.b);
+
+        EXPECT_FLOAT_EQ(orig->mColorSpecular.r, read->mColorSpecular.r);
+        EXPECT_FLOAT_EQ(orig->mColorSpecular.g, read->mColorSpecular.g);
+        EXPECT_FLOAT_EQ(orig->mColorSpecular.b, read->mColorSpecular.b);
+
+        EXPECT_NEAR(orig->mAngleInnerCone, read->mAngleInnerCone, 0.001);
+        EXPECT_NEAR(orig->mAngleOuterCone, read->mAngleOuterCone, 0.001);
+    }
+
+    // Cleanup, delete the exported file
+    EXPECT_EQ(0, std::remove(file));
+}
+
+#endif // ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/utColladaImportExport.cpp

@@ -0,0 +1,452 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/ColladaMetaData.h>
+#include <assimp/SceneCombiner.h>
+#include <assimp/commonMetaData.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utColladaImportExport : public AbstractImportExportBase {
+public:
+    // Clones the scene in an exception-safe way
+    struct SceneCloner {
+        SceneCloner(const aiScene *scene) {
+            sceneCopy = nullptr;
+            SceneCombiner::CopyScene(&sceneCopy, scene);
+        }
+
+        ~SceneCloner() {
+            delete sceneCopy;
+            sceneCopy = nullptr;
+        }
+        aiScene *sceneCopy;
+    };
+
+    bool importerTest() final {
+        Importer importer;
+        {
+          const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/duck.dae", aiProcess_ValidateDataStructure);
+          if (scene == nullptr) {
+              return false;
+          }
+
+          // Expected number of items
+          EXPECT_EQ(scene->mNumMeshes, 1u);
+          EXPECT_EQ(scene->mNumMaterials, 1u);
+          EXPECT_EQ(scene->mNumAnimations, 0u);
+          EXPECT_EQ(scene->mNumTextures, 0u);
+          EXPECT_EQ(scene->mNumLights, 1u);
+          EXPECT_EQ(scene->mNumCameras, 1u);
+
+          // Expected common metadata
+          aiString value;
+          EXPECT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT, value)) << "No importer format metadata";
+          EXPECT_STREQ("Collada Importer", value.C_Str());
+
+          EXPECT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT_VERSION, value)) << "No format version metadata";
+          EXPECT_STREQ("1.4.1", value.C_Str());
+
+          EXPECT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_GENERATOR, value)) << "No generator metadata";
+          EXPECT_EQ(strncmp(value.C_Str(), "Maya 8.0", 8), 0) << "AI_METADATA_SOURCE_GENERATOR was: " << value.C_Str();
+
+          EXPECT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_COPYRIGHT, value)) << "No copyright metadata";
+          EXPECT_EQ(strncmp(value.C_Str(), "Copyright 2006", 14), 0) << "AI_METADATA_SOURCE_COPYRIGHT was: " << value.C_Str();
+        }
+
+        {
+          const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/box_nested_animation.dae", aiProcess_ValidateDataStructure);
+          if (scene == nullptr) {
+              return false;
+          }
+
+          // Expect only one animation with the correct name
+          EXPECT_EQ(scene->mNumAnimations, 1u);
+          EXPECT_EQ(std::string(scene->mAnimations[0]->mName.C_Str()), std::string("Armature"));
+
+        }
+
+        return true;
+    }
+
+    using IdNameString = std::pair<std::string, std::string>;
+    using IdNameMap = std::map<std::string, std::string>;
+
+    template <typename T>
+    static IdNameString GetColladaIdName(const T *item, size_t index) {
+        std::ostringstream stream;
+        stream << typeid(T).name() << "@" << index;
+        if (item->mMetaData) {
+            if (aiString aiStr; item->mMetaData->Get(AI_METADATA_COLLADA_ID, aiStr)) {
+                return std::make_pair(std::string(aiStr.C_Str()), stream.str());
+            }
+        }
+        return std::make_pair(std::string(), stream.str());
+    }
+
+    template <typename T>
+    static IdNameString GetItemIdName(const T *item, size_t index) {
+        std::ostringstream stream;
+        stream << typeid(T).name() << "@" << index;
+        return std::make_pair(std::string(item->mName.C_Str()), stream.str());
+    }
+
+    // Specialisations
+    static IdNameString GetItemIdName(aiMaterial *item, size_t index) {
+        std::ostringstream stream;
+        stream << typeid(aiMaterial).name() << "@" << index;
+        return std::make_pair(std::string(item->GetName().C_Str()), stream.str());
+    }
+
+    static IdNameString GetItemIdName(const aiTexture *item, size_t index) {
+        std::ostringstream stream;
+        stream << typeid(aiTexture).name() << "@" << index;
+        return std::make_pair(std::string(item->mFilename.C_Str()), stream.str());
+    }
+
+    static void ReportDuplicate(IdNameMap &itemIdMap, const IdNameString &namePair, const char *typeNameStr) {
+        const auto result = itemIdMap.insert(namePair);
+        EXPECT_TRUE(result.second) << "Duplicate '" << typeNameStr << "' name: '" << namePair.first << "'. " << namePair.second << " == " << result.first->second;
+    }
+
+    template <typename T>
+    static void CheckUniqueIds(IdNameMap &itemIdMap, unsigned int itemCount, T **itemArray) {
+        for (size_t idx = 0; idx < itemCount; ++idx) {
+            IdNameString namePair = GetItemIdName(itemArray[idx], idx);
+            ReportDuplicate(itemIdMap, namePair, typeid(T).name());
+        }
+    }
+
+    static void CheckUniqueIds(IdNameMap &itemIdMap, const aiNode *parent, size_t index) {
+        IdNameString namePair = GetItemIdName(parent, index);
+        ReportDuplicate(itemIdMap, namePair, typeid(aiNode).name());
+
+        for (size_t idx = 0; idx < parent->mNumChildren; ++idx) {
+            CheckUniqueIds(itemIdMap, parent->mChildren[idx], idx);
+        }
+    }
+
+    static void CheckNodeIdNames(IdNameMap &nodeIdMap, IdNameMap &nodeNameMap, const aiNode *parent, size_t index) {
+        IdNameString namePair = GetItemIdName(parent, index);
+        IdNameString idPair = GetColladaIdName(parent, index);
+        ReportDuplicate(nodeIdMap, idPair, typeid(aiNode).name());
+
+        for (size_t idx = 0; idx < parent->mNumChildren; ++idx) {
+            CheckNodeIdNames(nodeIdMap, nodeNameMap, parent->mChildren[idx], idx);
+        }
+    }
+
+    static void SetAllNodeNames(const aiString &newName, aiNode *node) {
+        node->mName = newName;
+        for (size_t idx = 0; idx < node->mNumChildren; ++idx) {
+            SetAllNodeNames(newName, node->mChildren[idx]);
+        }
+    }
+
+    void ImportAndCheckIds(const char *file, const aiScene *origScene) {
+        // Import the Collada using the 'default' where aiNode and aiMesh names are the Collada ids
+        Importer importer;
+        const aiScene *scene = importer.ReadFile(file, aiProcess_ValidateDataStructure);
+        ASSERT_TRUE(scene != nullptr) << "Fatal: could not re-import " << file;
+        EXPECT_EQ(origScene->mNumMeshes, scene->mNumMeshes) << "in " << file;
+
+        // Check the ids are unique
+        IdNameMap itemIdMap;
+        // Recurse the Nodes
+        CheckUniqueIds(itemIdMap, scene->mRootNode, 0);
+        // Check the lists
+        CheckUniqueIds(itemIdMap, scene->mNumMeshes, scene->mMeshes);
+        // The remaining will come in using the name, which may not be unique
+        // Check we have the right number
+        EXPECT_EQ(origScene->mNumAnimations, scene->mNumAnimations);
+        EXPECT_EQ(origScene->mNumMaterials, scene->mNumMaterials);
+        EXPECT_EQ(origScene->mNumTextures, scene->mNumTextures);
+        EXPECT_EQ(origScene->mNumLights, scene->mNumLights);
+        EXPECT_EQ(origScene->mNumCameras, scene->mNumCameras);
+    }
+
+    void ImportAsNames(const char *file, const aiScene *origScene) {
+        // Import the Collada but using the user-visible names for aiNode and aiMesh
+        // Note that this mode may not support bones or animations
+        Importer importer;
+        importer.SetPropertyInteger(AI_CONFIG_IMPORT_COLLADA_USE_COLLADA_NAMES, 1);
+
+        const aiScene *scene = importer.ReadFile(file, aiProcess_ValidateDataStructure);
+        ASSERT_TRUE(scene != nullptr) << "Fatal: could not re-import " << file;
+        EXPECT_EQ(origScene->mNumMeshes, scene->mNumMeshes) << "in " << file;
+
+        // Check the node ids are unique but the node names are not
+        IdNameMap nodeIdMap;
+        IdNameMap nodeNameMap;
+        // Recurse the Nodes
+        CheckNodeIdNames(nodeIdMap, nodeNameMap, scene->mRootNode, 0);
+
+        // nodeNameMap should have fewer than nodeIdMap
+        EXPECT_LT(nodeNameMap.size(), nodeIdMap.size()) << "Some nodes should have the same names";
+        // Check the counts haven't changed
+        EXPECT_EQ(origScene->mNumAnimations, scene->mNumAnimations);
+        EXPECT_EQ(origScene->mNumMaterials, scene->mNumMaterials);
+        EXPECT_EQ(origScene->mNumTextures, scene->mNumTextures);
+        EXPECT_EQ(origScene->mNumLights, scene->mNumLights);
+        EXPECT_EQ(origScene->mNumCameras, scene->mNumCameras);
+    }
+};
+
+TEST_F(utColladaImportExport, importDaeFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+unsigned int GetMeshUseCount(const aiNode *rootNode) {
+    unsigned int result = rootNode->mNumMeshes;
+    for (unsigned int i = 0; i < rootNode->mNumChildren; ++i) {
+        result += GetMeshUseCount(rootNode->mChildren[i]);
+    }
+    return result;
+}
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+TEST_F(utColladaImportExport, exportRootNodeMeshTest) {
+    Importer importer;
+    Exporter exporter;
+    const char *outFile = "exportRootNodeMeshTest_out.dae";
+
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/duck.dae", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(scene != nullptr) << "Fatal: could not import duck.dae!";
+
+    ASSERT_EQ(0u, scene->mRootNode->mNumMeshes) << "Collada import should not give the root node a mesh";
+
+    {
+        SceneCloner clone(scene);
+        ASSERT_TRUE(clone.sceneCopy != nullptr) << "Fatal: could not copy scene!";
+        // Do this by moving the meshes from the first child that has some
+        aiNode *rootNode = clone.sceneCopy->mRootNode;
+        ASSERT_TRUE(rootNode->mNumChildren > 0) << "Fatal: root has no children";
+        aiNode *meshNode = rootNode->mChildren[0];
+        ASSERT_EQ(1u, meshNode->mNumMeshes) << "Fatal: First child node has no duck mesh";
+
+        // Move the meshes to the parent
+        rootNode->mNumMeshes = meshNode->mNumMeshes;
+        rootNode->mMeshes = new unsigned int[rootNode->mNumMeshes];
+        for (unsigned int i = 0; i < rootNode->mNumMeshes; ++i) {
+            rootNode->mMeshes[i] = meshNode->mMeshes[i];
+        }
+
+        // Remove the meshes from the original node
+        meshNode->mNumMeshes = 0;
+        delete[] meshNode->mMeshes;
+        meshNode->mMeshes = nullptr;
+
+        ASSERT_EQ(AI_SUCCESS, exporter.Export(clone.sceneCopy, "collada", outFile)) << "Fatal: Could not export file";
+    }
+
+    // Reimport and look for meshes
+    scene = importer.ReadFile(outFile, aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(scene != nullptr) << "Fatal: could not reimport!";
+
+    // A Collada root node is not allowed to have a mesh
+    ASSERT_EQ(0u, scene->mRootNode->mNumMeshes) << "Collada reimport should not give the root node a mesh";
+
+    // Walk nodes and counts used meshes
+    // Should be exactly one
+    EXPECT_EQ(1u, GetMeshUseCount(scene->mRootNode)) << "Nodes had unexpected number of meshes in use";
+}
+
+TEST_F(utColladaImportExport, exporterUniqueIdsTest) {
+    Importer importer;
+    Exporter exporter;
+    const char *outFileEmpty = "exportMeshIdTest_empty_out.dae";
+    const char *outFileNamed = "exportMeshIdTest_named_out.dae";
+
+    // Load a sample file containing multiple meshes
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/teapots.DAE", aiProcess_ValidateDataStructure);
+
+    ASSERT_TRUE(scene != nullptr) << "Fatal: could not import teapots.DAE!";
+    ASSERT_EQ(3u, scene->mNumMeshes) << "Fatal: teapots.DAE initial load failed";
+
+    // Clear all the names
+    for (size_t idx = 0; idx < scene->mNumMeshes; ++idx) {
+        scene->mMeshes[idx]->mName.Clear();
+    }
+    for (size_t idx = 0; idx < scene->mNumMaterials; ++idx) {
+        scene->mMaterials[idx]->RemoveProperty(AI_MATKEY_NAME);
+    }
+    for (size_t idx = 0; idx < scene->mNumAnimations; ++idx) {
+        scene->mAnimations[idx]->mName.Clear();
+    }
+    // Can't clear texture names
+    for (size_t idx = 0; idx < scene->mNumLights; ++idx) {
+        scene->mLights[idx]->mName.Clear();
+    }
+    for (size_t idx = 0; idx < scene->mNumCameras; ++idx) {
+        scene->mCameras[idx]->mName.Clear();
+    }
+
+    SetAllNodeNames(aiString(), scene->mRootNode);
+
+    ASSERT_EQ(AI_SUCCESS, exporter.Export(scene, "collada", outFileEmpty)) << "Fatal: Could not export un-named meshes file";
+
+    ImportAndCheckIds(outFileEmpty, scene);
+
+    // Force everything to have the same non-empty name
+    aiString testName("test_name");
+    for (size_t idx = 0; idx < scene->mNumMeshes; ++idx) {
+        scene->mMeshes[idx]->mName = testName;
+    }
+    for (size_t idx = 0; idx < scene->mNumMaterials; ++idx) {
+        scene->mMaterials[idx]->AddProperty(&testName, AI_MATKEY_NAME);
+    }
+    for (size_t idx = 0; idx < scene->mNumAnimations; ++idx) {
+        scene->mAnimations[idx]->mName = testName;
+    }
+    // Can't clear texture names
+    for (size_t idx = 0; idx < scene->mNumLights; ++idx) {
+        scene->mLights[idx]->mName = testName;
+    }
+    for (size_t idx = 0; idx < scene->mNumCameras; ++idx) {
+        scene->mCameras[idx]->mName = testName;
+    }
+
+    SetAllNodeNames(testName, scene->mRootNode);
+
+    ASSERT_EQ(AI_SUCCESS, exporter.Export(scene, "collada", outFileNamed)) << "Fatal: Could not export named meshes file";
+
+    ImportAndCheckIds(outFileNamed, scene);
+    ImportAsNames(outFileNamed, scene);
+}
+
+// This file is invalid, we just want to ensure that the importer is not crashing
+// This was reported as GH#4286. The "count" parameter in "Cube-mesh-positions-array" is too small.
+TEST_F(utColladaImportExport, parseInvalid4286) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/invalid/box_nested_animation_4286.dae", 0);
+    EXPECT_EQ(nullptr, scene);
+}
+
+#endif
+
+class utColladaZaeImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() final {
+        {
+            Assimp::Importer importer;
+            const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/duck.zae", aiProcess_ValidateDataStructure);
+            if (scene == nullptr)
+                return false;
+
+            // Expected number of items
+            EXPECT_EQ(scene->mNumMeshes, 1u);
+            EXPECT_EQ(scene->mNumMaterials, 1u);
+            EXPECT_EQ(scene->mNumAnimations, 0u);
+            //EXPECT_EQ(scene->mNumTextures, 1u);
+            EXPECT_EQ(scene->mNumLights, 1u);
+            EXPECT_EQ(scene->mNumCameras, 1u);
+        }
+
+        {
+            Assimp::Importer importer;
+            const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/duck_nomanifest.zae", aiProcess_ValidateDataStructure);
+            if (scene == nullptr)
+                return false;
+
+            // Expected number of items
+            EXPECT_EQ(scene->mNumMeshes, 1u);
+            EXPECT_EQ(scene->mNumMaterials, 1u);
+            EXPECT_EQ(scene->mNumAnimations, 0u);
+            //EXPECT_EQ(scene->mNumTextures, 1u);
+            EXPECT_EQ(scene->mNumLights, 1u);
+            EXPECT_EQ(scene->mNumCameras, 1u);
+        }
+
+        return true;
+    }
+};
+
+TEST_F(utColladaZaeImportExport, importBlenFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utColladaZaeImportExport, importMakeHumanTest) {
+    Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/Collada/human.zae", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+
+    // Expected number of items
+    EXPECT_EQ(scene->mNumMeshes, 2u);
+    EXPECT_EQ(scene->mNumMaterials, 2u);
+    EXPECT_EQ(scene->mNumAnimations, 0u);
+    EXPECT_EQ(scene->mNumTextures, 2u);
+    EXPECT_EQ(scene->mNumLights, 0u);
+    EXPECT_EQ(scene->mNumCameras, 0u);
+
+    // Expected common metadata
+    aiString value;
+    EXPECT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT, value)) << "No importer format metadata";
+    EXPECT_STREQ("Collada Importer", value.C_Str());
+
+    EXPECT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT_VERSION, value)) << "No format version metadata";
+    EXPECT_STREQ("1.4.1", value.C_Str());
+}
+
+static constexpr  char kData[] = " \
+<?xml version=\"1.0\" encoding=\"utf-8\"?> \
+<COLLADA version=\"1.4.1\"> \
+  <library_geometries> \
+    <geometry id=\"fuzz2772-geo\" name=\"fuzz2772\"> \
+      <mesh> \
+        <triangles count=\"1\"><input semantic=\"VERTEXERTEX\" source=\"#fuzz2772-verts\" offset=\"0\"/><p>0 1 2</p></triangles> \
+      </mesh> \
+    </geometry> \
+  </library_geometries> \
+</COLLADA> \
+";
+
+TEST_F(utColladaZaeImportExport, import_causes_heap_overflow_issue6373) {
+    Importer importer;
+    const aiScene *scene = importer.ReadFileFromMemory(kData, sizeof(kData), aiProcess_ValidateDataStructure);
+    EXPECT_EQ(nullptr, scene);
+}

vendor/assimp/test/unit/utD3MFImportExport.cpp

@@ -0,0 +1,99 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Exporter.hpp>
+#include <assimp/Importer.hpp>
+
+#include "AssetLib/3MF/D3MFExporter.h"
+
+class utD3MFImporterExporter : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3MF/box.3mf", aiProcess_ValidateDataStructure);
+        if (nullptr == scene) {
+            return false;
+        }
+
+        EXPECT_EQ(1u, scene->mNumMeshes);
+        aiMesh *mesh = scene->mMeshes[0];
+        EXPECT_NE(nullptr, mesh);
+        EXPECT_EQ(12u, mesh->mNumFaces);
+        EXPECT_EQ(8u, mesh->mNumVertices);
+
+        return (nullptr != scene);
+    }
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+    bool exporterTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/3MF/box.3mf", 0);
+
+        Assimp::Exporter exporter;
+        return AI_SUCCESS == exporter.Export(scene, "3mf", "test.3mf");
+    }
+#endif // ASSIMP_BUILD_NO_EXPORT
+};
+
+TEST_F(utD3MFImporterExporter, import3MFFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+TEST_F(utD3MFImporterExporter, export3MFtoMemTest) {
+    //EXPECT_TRUE(exporterTest());
+}
+
+TEST_F(utD3MFImporterExporter, roundtrip3MFtoMemTest) {
+    /*EXPECT_TRUE(exporterTest());
+
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile("test.3mf", 0);
+    EXPECT_NE(nullptr, scene));*/
+}
+
+#endif // ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/utDXFImporterExporter.cpp

@@ -0,0 +1,87 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utDXFImporterExporter : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/DXF/PinkEggFromLW.dxf", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utDXFImporterExporter, importDXFFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utDXFImporterExporter, importerWithoutExtensionTest) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/DXF/lineTest", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utDXFImporterExporter, issue2229) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/DXF/issue_2229.dxf", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utDXFImporterExporter, importWuson) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/DXF/wuson.dxf", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utDXFImporterExporter, importRifle) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_NONBSD_DIR "/DXF/rifle.dxf", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utDefaultIOStream.cpp

@@ -0,0 +1,85 @@
+/*-------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+-------------------------------------------------------------------------*/
+#include <gtest/gtest.h>
+#include "TestIOStream.h"
+#include "UnitTestFileGenerator.h"
+#include "Tools/TestTools.h"
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+
+using namespace ::Assimp;
+
+class utDefaultIOStream : public ::testing::Test {
+    // empty
+};
+
+const char data[]{"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Qui\
+sque luctus sem diam, ut eleifend arcu auctor eu. Vestibulum id est vel nulla l\
+obortis malesuada ut sed turpis. Nulla a volutpat tortor. Nunc vestibulum portt\
+itor sapien ornare sagittis volutpat."};
+
+TEST_F( utDefaultIOStream, FileSizeTest ) {
+    const auto dataSize = sizeof(data);
+    const auto dataCount = dataSize / sizeof(*data);
+
+    char fpath[] = { TMP_PATH"rndfp.XXXXXX\0" };
+    std::string tmpName;
+    auto *fs = MakeTmpFile(fpath, std::strlen(fpath), tmpName);
+    ASSERT_NE(nullptr, fs);
+    {
+        auto written = std::fwrite(data, sizeof(*data), dataCount, fs );
+        EXPECT_NE( 0U, written );
+
+        auto vflush = std::fflush( fs );
+        ASSERT_EQ(vflush, 0);
+
+		std::fclose(fs);
+
+        EXPECT_TRUE(Unittest::TestTools::openFilestream(&fs, tmpName.c_str(), "r"));
+        ASSERT_NE(nullptr, fs);
+
+        TestDefaultIOStream myStream( fs, fpath);
+        size_t size = myStream.FileSize();
+        EXPECT_EQ( size, dataSize);
+    }
+    remove(tmpName.c_str());
+}

vendor/assimp/test/unit/utExport.cpp

@@ -0,0 +1,114 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include <assimp/cexport.h>
+#include <assimp/Exporter.hpp>
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+class ExporterTest : public ::testing::Test {
+public:
+    void SetUp() override {
+        ex = new Assimp::Exporter();
+        im = new Assimp::Importer();
+
+        pTest = im->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/test.x", aiProcess_ValidateDataStructure);
+    }
+
+    void TearDown() override {
+        delete ex;
+        delete im;
+    }
+
+protected:
+    const aiScene* pTest;
+    Assimp::Exporter* ex;
+    Assimp::Importer* im;
+};
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ExporterTest, testExportToFile) {
+    const char* file = "unittest_output.dae";
+    EXPECT_EQ(AI_SUCCESS,ex->Export(pTest,"collada",file));
+
+    // check if we can read it again
+    EXPECT_TRUE(im->ReadFile(file, aiProcess_ValidateDataStructure));
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ExporterTest, testExportToBlob) {
+    const aiExportDataBlob* blob = ex->ExportToBlob(pTest,"collada");
+    ASSERT_TRUE(blob);
+    EXPECT_TRUE(blob->data);
+    EXPECT_GT(blob->size,  0U);
+    EXPECT_EQ(0U, blob->name.length);
+
+    // XXX test chained blobs (i.e. obj file with accompanying mtl script)
+
+    // check if we can read it again
+    EXPECT_TRUE(im->ReadFileFromMemory(blob->data,blob->size,0,"dae"));
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ExporterTest, testCppExportInterface) {
+    EXPECT_TRUE(ex->GetExportFormatCount() > 0);
+    for(size_t i = 0; i < ex->GetExportFormatCount(); ++i) {
+        const aiExportFormatDesc* const desc = ex->GetExportFormatDescription(i);
+        ASSERT_TRUE(desc);
+        EXPECT_TRUE(desc->description && strlen(desc->description));
+        EXPECT_TRUE(desc->fileExtension && strlen(desc->fileExtension));
+        EXPECT_TRUE(desc->id && strlen(desc->id));
+    }
+
+    EXPECT_TRUE(ex->IsDefaultIOHandler());
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ExporterTest, testCExportInterface) {
+    EXPECT_TRUE(aiGetExportFormatCount() > 0);
+    for(size_t i = 0; i < aiGetExportFormatCount(); ++i) {
+        const aiExportFormatDesc* const desc = aiGetExportFormatDescription(i);
+        EXPECT_TRUE(desc);
+    }
+}
+
+#endif
+

vendor/assimp/test/unit/utFBXImporterExporter.cpp

@@ -0,0 +1,463 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/commonMetaData.h>
+#include <assimp/material.h>
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/types.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utFBXImporterExporter : public AbstractImportExportBase {
+public:
+    bool importerTest() override {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/spider.fbx", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utFBXImporterExporter, importXFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utFBXImporterExporter, importBareBoxWithoutColorsAndTextureCoords) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/box.fbx", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+    EXPECT_EQ(scene->mNumMeshes, 1u);
+    aiMesh *mesh = scene->mMeshes[0];
+    EXPECT_EQ(mesh->mNumFaces, 12u);
+    EXPECT_EQ(mesh->mNumVertices, 36u);
+}
+
+TEST_F(utFBXImporterExporter, importCubesWithNoNames) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/cubes_nonames.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(scene);
+
+    ASSERT_TRUE(scene->mRootNode);
+    const auto root = scene->mRootNode;
+    ASSERT_STREQ(root->mName.C_Str(), "RootNode");
+    ASSERT_TRUE(root->mChildren);
+    ASSERT_EQ(root->mNumChildren, 2u);
+}
+
+TEST_F(utFBXImporterExporter, importCubesWithUnicodeDuplicatedNames) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/cubes_with_names.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(scene);
+
+    ASSERT_TRUE(scene->mRootNode);
+    const auto root = scene->mRootNode;
+    ASSERT_STREQ(root->mName.C_Str(), "RootNode");
+    ASSERT_TRUE(root->mChildren);
+    ASSERT_EQ(root->mNumChildren, 2u);
+
+    const auto child0 = root->mChildren[0];
+    ASSERT_TRUE(child0);
+    ASSERT_STREQ(child0->mName.C_Str(), "Cube2");
+    ASSERT_TRUE(child0->mChildren);
+    ASSERT_EQ(child0->mNumChildren, 1u);
+
+    const auto child00 = child0->mChildren[0];
+    ASSERT_TRUE(child00);
+    ASSERT_STREQ(child00->mName.C_Str(), "\xd0\x9a\xd1\x83\xd0\xb1\x31");
+
+    const auto child1 = root->mChildren[1];
+    ASSERT_TRUE(child1);
+    ASSERT_STREQ(child1->mName.C_Str(), "Cube3");
+    ASSERT_TRUE(child1->mChildren);
+    ASSERT_EQ(child1->mNumChildren, 1u);
+
+    const auto child10 = child1->mChildren[0];
+    ASSERT_TRUE(child10);
+    ASSERT_STREQ(child10->mName.C_Str(), "\xd0\x9a\xd1\x83\xd0\xb1\x31");
+}
+
+TEST_F(utFBXImporterExporter, importCubesComplexTransform) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/cubes_with_mirroring_and_pivot.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(scene);
+
+    ASSERT_TRUE(scene->mRootNode);
+    const auto root = scene->mRootNode;
+    ASSERT_STREQ(root->mName.C_Str(), "RootNode");
+    ASSERT_TRUE(root->mChildren);
+    ASSERT_EQ(root->mNumChildren, 2u);
+
+    const auto child0 = root->mChildren[0];
+    ASSERT_TRUE(child0);
+    ASSERT_STREQ(child0->mName.C_Str(), "Cube2");
+    ASSERT_TRUE(child0->mChildren);
+    ASSERT_EQ(child0->mNumChildren, 1u);
+
+    const auto child00 = child0->mChildren[0];
+    ASSERT_TRUE(child00);
+    ASSERT_STREQ(child00->mName.C_Str(), "Cube1");
+
+    const auto child1 = root->mChildren[1];
+    ASSERT_TRUE(child1);
+    ASSERT_STREQ(child1->mName.C_Str(), "Cube3");
+
+    auto parent = child1;
+    const size_t chain_length = 8u;
+    const char *chainStr[chain_length] = {
+        "Cube1_$AssimpFbx$_Translation",
+        "Cube1_$AssimpFbx$_RotationPivot",
+        "Cube1_$AssimpFbx$_RotationPivotInverse",
+        "Cube1_$AssimpFbx$_ScalingOffset",
+        "Cube1_$AssimpFbx$_ScalingPivot",
+        "Cube1_$AssimpFbx$_Scaling",
+        "Cube1_$AssimpFbx$_ScalingPivotInverse",
+        "Cube1"
+    };
+    for (size_t i = 0; i < chain_length; ++i) {
+        ASSERT_TRUE(parent->mChildren);
+        ASSERT_EQ(parent->mNumChildren, 1u);
+        auto node = parent->mChildren[0];
+        ASSERT_TRUE(node);
+        ASSERT_STREQ(node->mName.C_Str(), chainStr[i]);
+        parent = node;
+    }
+    ASSERT_EQ(0u, parent->mNumChildren) << "Leaf node";
+}
+
+TEST_F(utFBXImporterExporter, importCloseToIdentityTransforms) {
+    Assimp::Importer importer;
+    // This was asserting in FBXConverter.cpp because the transforms appeared to be the identity by one test, but not by another.
+    // This asset should now load successfully.
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/close_to_identity_transforms.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_TRUE(scene);
+}
+
+TEST_F(utFBXImporterExporter, importPhongMaterial) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/phong_cube.fbx", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+    EXPECT_EQ(1u, scene->mNumMaterials);
+    const aiMaterial *mat = scene->mMaterials[0];
+    EXPECT_NE(nullptr, mat);
+    float f;
+    aiColor3D c;
+
+    // phong_cube.fbx has all properties defined
+    EXPECT_EQ(mat->Get(AI_MATKEY_COLOR_DIFFUSE, c), aiReturn_SUCCESS);
+    EXPECT_EQ(c, aiColor3D(0.5, 0.25, 0.25));
+    EXPECT_EQ(mat->Get(AI_MATKEY_COLOR_SPECULAR, c), aiReturn_SUCCESS);
+    EXPECT_EQ(c, aiColor3D(0.25, 0.25, 0.5));
+    EXPECT_EQ(mat->Get(AI_MATKEY_SHININESS_STRENGTH, f), aiReturn_SUCCESS);
+    EXPECT_EQ(f, 0.5f);
+    EXPECT_EQ(mat->Get(AI_MATKEY_SHININESS, f), aiReturn_SUCCESS);
+    EXPECT_EQ(f, 10.0f);
+    EXPECT_EQ(mat->Get(AI_MATKEY_COLOR_AMBIENT, c), aiReturn_SUCCESS);
+    EXPECT_EQ(c, aiColor3D(0.125, 0.25, 0.25));
+    EXPECT_EQ(mat->Get(AI_MATKEY_COLOR_EMISSIVE, c), aiReturn_SUCCESS);
+    EXPECT_EQ(c, aiColor3D(0.25, 0.125, 0.25));
+    EXPECT_EQ(mat->Get(AI_MATKEY_COLOR_TRANSPARENT, c), aiReturn_SUCCESS);
+    EXPECT_EQ(c, aiColor3D(0.75, 0.5, 0.25));
+    EXPECT_EQ(mat->Get(AI_MATKEY_OPACITY, f), aiReturn_SUCCESS);
+    EXPECT_EQ(f, 0.5f);
+}
+
+TEST_F(utFBXImporterExporter, importUnitScaleFactor) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/global_settings.fbx", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+    EXPECT_NE(nullptr, scene->mMetaData);
+
+    float factor(0.0f);
+    scene->mMetaData->Get("UnitScaleFactor", factor);
+    EXPECT_EQ(500.0f, factor);
+
+    scene->mMetaData->Set("UnitScaleFactor", factor * 2.0f);
+    scene->mMetaData->Get("UnitScaleFactor", factor);
+    EXPECT_EQ(1000.0f, factor);
+}
+
+TEST_F(utFBXImporterExporter, importEmbeddedAsciiTest) {
+    // see https://github.com/assimp/assimp/issues/1957
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/embedded_ascii/box.FBX", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+
+    EXPECT_EQ(1u, scene->mNumMaterials);
+    aiMaterial *mat = scene->mMaterials[0];
+    ASSERT_NE(nullptr, mat);
+
+    aiString path;
+    aiTextureMapMode modes[2];
+    EXPECT_EQ(aiReturn_SUCCESS, mat->GetTexture(aiTextureType_DIFFUSE, 0, &path, nullptr, nullptr, nullptr, nullptr, modes));
+    ASSERT_STREQ(path.C_Str(), "..\\..\\..\\Desktop\\uv_test.png");
+
+    ASSERT_EQ(1u, scene->mNumTextures);
+    ASSERT_TRUE(scene->mTextures[0]->pcData);
+    ASSERT_EQ(439176u, scene->mTextures[0]->mWidth) << "FBX ASCII base64 compression splits data by 512Kb, it should be two parts for this texture";
+}
+
+TEST_F(utFBXImporterExporter, importEmbeddedFragmentedAsciiTest) {
+    // see https://github.com/assimp/assimp/issues/1957
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/embedded_ascii/box_embedded_texture_fragmented.fbx", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+
+    EXPECT_EQ(1u, scene->mNumMaterials);
+    aiMaterial *mat = scene->mMaterials[0];
+    ASSERT_NE(nullptr, mat);
+
+    aiString path;
+    aiTextureMapMode modes[2];
+    ASSERT_EQ(aiReturn_SUCCESS, mat->GetTexture(aiTextureType_DIFFUSE, 0, &path, nullptr, nullptr, nullptr, nullptr, modes));
+    ASSERT_STREQ(path.C_Str(), "paper.png");
+
+    ASSERT_EQ(1u, scene->mNumTextures);
+    ASSERT_TRUE(scene->mTextures[0]->pcData);
+    ASSERT_EQ(968029u, scene->mTextures[0]->mWidth) << "FBX ASCII base64 compression splits data by 512Kb, it should be two parts for this texture";
+}
+
+TEST_F(utFBXImporterExporter, fbxTokenizeTestTest) {
+    //Assimp::Importer importer;
+    //const aiScene* scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/transparentTest2.fbx", aiProcess_ValidateDataStructure);
+    //EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utFBXImporterExporter, importOrphantEmbeddedTextureTest) {
+    // see https://github.com/assimp/assimp/issues/1957
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/box_orphant_embedded_texture.fbx", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+
+    EXPECT_EQ(1u, scene->mNumMaterials);
+    aiMaterial *mat = scene->mMaterials[0];
+    ASSERT_NE(nullptr, mat);
+
+    aiString path;
+    aiTextureMapMode modes[2];
+    ASSERT_EQ(aiReturn_SUCCESS, mat->GetTexture(aiTextureType_DIFFUSE, 0, &path, nullptr, nullptr, nullptr, nullptr, modes));
+    ASSERT_STREQ(path.C_Str(), "..\\Primitives\\GridGrey.tga");
+
+    ASSERT_EQ(1u, scene->mNumTextures);
+    ASSERT_TRUE(scene->mTextures[0]->pcData);
+    ASSERT_EQ(9026u, scene->mTextures[0]->mWidth) << "FBX ASCII base64 compression used for a texture.";
+}
+
+TEST_F(utFBXImporterExporter, sceneMetadata) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/global_settings.fbx",
+            aiProcess_ValidateDataStructure);
+    ASSERT_NE(scene, nullptr);
+    ASSERT_NE(scene->mMetaData, nullptr);
+    {
+        ASSERT_TRUE(scene->mMetaData->HasKey(AI_METADATA_SOURCE_FORMAT));
+        aiString format;
+        ASSERT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT, format));
+        ASSERT_EQ(strcmp(format.C_Str(), "Autodesk FBX Importer"), 0);
+    }
+    {
+        ASSERT_TRUE(scene->mMetaData->HasKey(AI_METADATA_SOURCE_FORMAT_VERSION));
+        aiString version;
+        ASSERT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_FORMAT_VERSION, version));
+        ASSERT_EQ(strcmp(version.C_Str(), "7400"), 0);
+    }
+    {
+        ASSERT_TRUE(scene->mMetaData->HasKey(AI_METADATA_SOURCE_GENERATOR));
+        aiString generator;
+        ASSERT_TRUE(scene->mMetaData->Get(AI_METADATA_SOURCE_GENERATOR, generator));
+        ASSERT_EQ(strncmp(generator.C_Str(), "Blender", 7), 0);
+    }
+}
+
+TEST_F(utFBXImporterExporter, importCustomAxes) {
+    // see https://github.com/assimp/assimp/issues/5494
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/embedded_ascii/box.FBX", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+
+    // The ASCII box has customised the Up and Forward axes, verify that the RootNode transform has applied it
+    ASSERT_FALSE(scene->mRootNode->mTransformation.IsIdentity()) << "Did not apply the custom axis transform";
+
+    aiVector3D upVec{ 0, 0, 1 }; // Up is +Z
+    aiVector3D forwardVec{ 0, -1, 0 }; // Forward is -Y
+    aiVector3D rightVec{ 1, 0, 0 }; // Right is +X
+    aiMatrix4x4 mat(rightVec.x, rightVec.y, rightVec.z, 0.0f,
+            upVec.x, upVec.y, upVec.z, 0.0f,
+            forwardVec.x, forwardVec.y, forwardVec.z, 0.0f,
+            0.0f, 0.0f, 0.0f, 1.0f);
+
+    EXPECT_EQ(mat, scene->mRootNode->mTransformation);
+}
+
+TEST_F(utFBXImporterExporter, importIgnoreCustomAxes) {
+    // see https://github.com/assimp/assimp/issues/5494
+    Assimp::Importer importer;
+    importer.SetPropertyBool(AI_CONFIG_IMPORT_FBX_IGNORE_UP_DIRECTION, true);
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/embedded_ascii/box.FBX", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+
+    // Verify that the RootNode transform has NOT applied the custom axes
+    EXPECT_TRUE(scene->mRootNode->mTransformation.IsIdentity());
+}
+
+TEST_F(utFBXImporterExporter, importCubesWithOutOfRangeFloat) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/cubes_with_outofrange_float.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+    ASSERT_TRUE(scene->mRootNode);
+}
+
+TEST_F(utFBXImporterExporter, importMaxPbrMaterialsMetalRoughness) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/maxPbrMaterial_metalRough.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+    ASSERT_TRUE(scene->mRootNode);
+
+    ASSERT_EQ(scene->mNumMaterials, 1u);
+    const aiMaterial* mat = scene->mMaterials[0];
+    aiString texture;
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_BASE_COLOR, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\albedo.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_METALNESS, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\metalness.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_EMISSION_COLOR, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\emission.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_NORMAL_CAMERA, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\normal.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_DIFFUSE_ROUGHNESS, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\roughness.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_AMBIENT_OCCLUSION, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\occlusion.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_OPACITY, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\opacity.png"));
+
+    // The material contains values for standard properties (e.g. SpecularColor), where 3ds Max has presumably
+    // used formulas to map the Pbr values into the standard material model. However, the pbr values themselves
+    // are available in the material as untyped "raw" properties. We check that these are correctly parsed:
+
+    aiColor4D baseColor;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|basecolor", aiTextureType_NONE, 0, baseColor), aiReturn_SUCCESS);
+    EXPECT_EQ(baseColor, aiColor4D(0, 1, 1, 1));
+
+    float metalness;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|metalness", aiTextureType_NONE, 0, metalness), aiReturn_SUCCESS);
+    EXPECT_EQ(metalness, 0.25f);
+
+    float roughness;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|roughness", aiTextureType_NONE, 0, roughness), aiReturn_SUCCESS);
+    EXPECT_EQ(roughness, 0.5f);
+
+    int useGlossiness;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|useGlossiness", aiTextureType_NONE, 0, useGlossiness), aiReturn_SUCCESS);
+    EXPECT_EQ(useGlossiness, 2); // 1 = Roughness map is glossiness, 2 = Roughness map is roughness.
+
+    float bumpMapAmt; // Presumably amount.
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|bump_map_amt", aiTextureType_NONE, 0, bumpMapAmt), aiReturn_SUCCESS);
+    EXPECT_EQ(bumpMapAmt, 0.75f);
+
+    aiColor4D emitColor;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|emit_color", aiTextureType_NONE, 0, emitColor), aiReturn_SUCCESS);
+    EXPECT_EQ(emitColor, aiColor4D(1, 1, 0, 1));
+}
+
+TEST_F(utFBXImporterExporter, importMaxPbrMaterialsSpecularGloss) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/maxPbrMaterial_specGloss.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+    ASSERT_TRUE(scene->mRootNode);
+
+    ASSERT_EQ(scene->mNumMaterials, 1u);
+    const aiMaterial* mat = scene->mMaterials[0];
+    aiString texture;
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_BASE_COLOR, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\albedo.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_SPECULAR, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\specular.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_EMISSION_COLOR, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\emission.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_NORMAL_CAMERA, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\normal.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_SHININESS, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\glossiness.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_AMBIENT_OCCLUSION, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\occlusion.png"));
+    ASSERT_EQ(mat->Get(AI_MATKEY_TEXTURE(aiTextureType_OPACITY, 0), texture), AI_SUCCESS);
+    EXPECT_EQ(texture, aiString("Textures\\opacity.png"));
+
+    // The material contains values for standard properties (e.g. SpecularColor), where 3ds Max has presumably
+    // used formulas to map the Pbr values into the standard material model. However, the pbr values themselves
+    // are available in the material as untyped "raw" properties. We check that these are correctly parsed:
+
+    aiColor4D baseColor;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|basecolor", aiTextureType_NONE, 0, baseColor), aiReturn_SUCCESS);
+    EXPECT_EQ(baseColor, aiColor4D(0, 1, 1, 1));
+
+    aiColor4D specular;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|Specular", aiTextureType_NONE, 0, specular), aiReturn_SUCCESS);
+    EXPECT_EQ(specular, aiColor4D(1, 1, 0, 1));
+
+    float glossiness;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|glossiness", aiTextureType_NONE, 0, glossiness), aiReturn_SUCCESS);
+    EXPECT_EQ(glossiness, 0.33f);
+
+    int useGlossiness;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|useGlossiness", aiTextureType_NONE, 0, useGlossiness), aiReturn_SUCCESS);
+    EXPECT_EQ(useGlossiness, 1); // 1 = Glossiness map is glossiness, 2 = Glossiness map is roughness.
+
+    float bumpMapAmt; // Presumably amount.
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|bump_map_amt", aiTextureType_NONE, 0, bumpMapAmt), aiReturn_SUCCESS);
+    EXPECT_EQ(bumpMapAmt, 0.66f);
+
+    aiColor4D emitColor;
+    ASSERT_EQ(mat->Get("$raw.3dsMax|main|emit_color", aiTextureType_NONE, 0, emitColor), aiReturn_SUCCESS);
+    EXPECT_EQ(emitColor, aiColor4D(1, 0, 1, 1));
+}
+
+TEST_F(utFBXImporterExporter, importSkeletonTest) {
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/FBX/animation_with_skeleton.fbx", aiProcess_ValidateDataStructure);
+    ASSERT_NE(nullptr, scene);
+    ASSERT_TRUE(scene->mRootNode);
+}

vendor/assimp/test/unit/utFastAtof.cpp

@@ -0,0 +1,189 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/fast_atof.h>
+
+namespace {
+
+template <typename Real>
+bool IsNan(Real x) {
+    return x != x;
+}
+
+template <typename Real>
+bool IsInf(Real x) {
+    return std::abs(x) == std::numeric_limits<Real>::infinity();
+}
+
+} // Namespace
+
+class FastAtofTest : public ::testing::Test
+{
+protected:
+    template <typename Real, typename AtofFunc>
+    static void RunTest(AtofFunc atof_func)
+    {
+        const Real kEps = 1e-5f;
+
+#define TEST_CASE(NUM) EXPECT_NEAR(static_cast<Real>(NUM), atof_func(#NUM), kEps)
+#define TEST_CASE_NAN(NUM) EXPECT_TRUE(IsNan(atof_func(#NUM)))
+#define TEST_CASE_INF(NUM) EXPECT_TRUE(IsInf(atof_func(#NUM)))
+
+        TEST_CASE(0);
+        TEST_CASE(1.354);
+        TEST_CASE(1054E-3);
+        TEST_CASE(-1054E-3);
+        TEST_CASE(-10.54E30);
+        TEST_CASE(-345554.54e-5);
+        TEST_CASE(-34555.534954e-5);
+        TEST_CASE(-34555.534954e-5);
+        TEST_CASE(549067);
+        TEST_CASE(567);
+        TEST_CASE(446);
+        TEST_CASE(7);
+        TEST_CASE(73);
+        TEST_CASE(256);
+        TEST_CASE(5676);
+        TEST_CASE(3);
+        TEST_CASE(738);
+        TEST_CASE(684);
+        TEST_CASE(26);
+        TEST_CASE(673.678e-56);
+        TEST_CASE(53);
+        TEST_CASE(67);
+        TEST_CASE(684);
+        TEST_CASE(-5437E24);
+        TEST_CASE(8);
+        TEST_CASE(84);
+        TEST_CASE(3);
+        TEST_CASE(56733.68);
+        TEST_CASE(786);
+        TEST_CASE(6478);
+        TEST_CASE(34563.65683598734);
+        TEST_CASE(5673);
+        TEST_CASE(784e-3);
+        TEST_CASE(8678);
+        TEST_CASE(46784);
+        TEST_CASE(-54.0888e-6);
+        TEST_CASE(100000e10);
+        TEST_CASE(1e-307);
+        TEST_CASE(0.000001e-301);
+        TEST_CASE(0.0000001e-300);
+        TEST_CASE(0.00000001e-299);
+        TEST_CASE(1000000e-313);
+        TEST_CASE(10000000e-314);
+        TEST_CASE(100000000e-315);
+        TEST_CASE(12.345);
+        TEST_CASE(12.345e19);
+        TEST_CASE(-.1e+9);
+        TEST_CASE(.125);
+        TEST_CASE(1e20);
+        TEST_CASE(0e-19);
+        TEST_CASE(400012);
+        TEST_CASE(5.9e-76);
+        TEST_CASE(7.54979e-8);
+        TEST_CASE_INF(inf);
+        TEST_CASE_INF(inf);
+        TEST_CASE_INF(infinity);
+        TEST_CASE_INF(Inf);
+        TEST_CASE_INF(-Inf);
+        TEST_CASE_INF(+InFiNiTy);
+        TEST_CASE_NAN(NAN);
+        TEST_CASE_NAN(NaN);
+        TEST_CASE_NAN(nan);
+        EXPECT_EQ(static_cast<Real>(6), atof_func("006"));
+        EXPECT_EQ(static_cast<Real>(5.3), atof_func("5.300  "));
+
+        /* Failing Cases:
+        EXPECT_EQ(static_cast<Real>(6), atof_func("  006"));
+        EXPECT_EQ(static_cast<Real>(5.3), atof_func("  5.300  "));
+        TEST_CASE(-10.54E45);
+        TEST_CASE(0x0A);
+        TEST_CASE(0xA0);
+        TEST_CASE(0x1p1023);
+        TEST_CASE(0x1000p1011);
+        TEST_CASE(0x1p1020);
+        TEST_CASE(0x0.00001p1040);
+        TEST_CASE(0x1p-1021);
+        TEST_CASE(0x1000p-1033);
+        TEST_CASE(0x10000p-1037);
+        TEST_CASE(0x0.001p-1009);
+        TEST_CASE(0x0.0001p-1005);
+        TEST_CASE(0x1.4p+3);
+        TEST_CASE(0xAp0);
+        TEST_CASE(0x0Ap0);
+        TEST_CASE(0x0.A0p8);
+        TEST_CASE(0x0.50p9);
+        TEST_CASE(0x0.28p10);
+        TEST_CASE(0x0.14p11);
+        TEST_CASE(0x0.0A0p12);
+        TEST_CASE(0x0.050p13);
+        TEST_CASE(0x0.028p14);
+        TEST_CASE(0x0.014p15);
+        TEST_CASE(0x00.00A0p16);
+        TEST_CASE(0x00.0050p17);
+        TEST_CASE(0x00.0028p18);
+        TEST_CASE(0x00.0014p19);
+        TEST_CASE(0x1p-1023);
+        TEST_CASE(0x0.8p-1022);
+        TEST_CASE(0x80000Ap-23);
+        TEST_CASE(0x100000000000008p0);
+        TEST_CASE(0x100000000000008.p0);
+        TEST_CASE(0x100000000000008.00p0);
+        TEST_CASE(0x10000000000000800p0);
+        TEST_CASE(0x10000000000000801p0)
+        */
+
+#undef TEST_CASE
+#undef TEST_CASE_NAN
+#undef TEST_CASE_INF
+    }
+};
+
+struct FastAtofWrapper {
+    ai_real operator()(const char* str) { return Assimp::fast_atof(str); }
+};
+
+TEST_F(FastAtofTest, FastAtof)
+{
+    RunTest<ai_real>(FastAtofWrapper());
+}

vendor/assimp/test/unit/utFindDegenerates.cpp

@@ -0,0 +1,243 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include "../../include/assimp/scene.h"
+#include "PostProcessing/FindDegenerates.h"
+
+#include <memory>
+
+using namespace std;
+using namespace Assimp;
+
+class FindDegeneratesProcessTest : public ::testing::Test {
+public:
+    FindDegeneratesProcessTest() :
+            Test(), mMesh(nullptr), mProcess(nullptr) {
+        // empty
+    }
+
+protected:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    aiMesh *mMesh;
+    FindDegeneratesProcess *mProcess;
+};
+
+void FindDegeneratesProcessTest::SetUp() {
+    mMesh = new aiMesh();
+    mProcess = new FindDegeneratesProcess();
+
+    mMesh->mNumFaces = 1000;
+    mMesh->mFaces = new aiFace[1000];
+
+    mMesh->mNumVertices = 5000 * 2;
+    mMesh->mVertices = new aiVector3D[5000 * 2];
+
+    for (unsigned int i = 0; i < 5000; ++i) {
+        mMesh->mVertices[i] = mMesh->mVertices[i + 5000] = aiVector3D((float)i);
+    }
+
+    mMesh->mPrimitiveTypes = aiPrimitiveType_LINE | aiPrimitiveType_POINT |
+                             aiPrimitiveType_POLYGON | aiPrimitiveType_TRIANGLE;
+
+    unsigned int numOut = 0, numFaces = 0;
+    for (unsigned int i = 0; i < 1000; ++i) {
+        aiFace &f = mMesh->mFaces[i];
+        f.mNumIndices = (i % 5) + 1; // between 1 and 5
+        f.mIndices = new unsigned int[f.mNumIndices];
+        bool had = false;
+        for (unsigned int n = 0; n < f.mNumIndices; ++n) {
+            // FIXME
+#if 0
+        // some duplicate indices
+        if ( n && n == (i / 200)+1) {
+            f.mIndices[n] = f.mIndices[n-1];
+            had = true;
+        }
+        // and some duplicate vertices
+#endif
+            if (n && i % 2 && 0 == n % 2) {
+                f.mIndices[n] = f.mIndices[n - 1] + 5000;
+                had = true;
+            } else {
+                f.mIndices[n] = numOut++;
+            }
+        }
+        if (!had)
+            ++numFaces;
+    }
+    mMesh->mNumUVComponents[0] = numOut;
+    mMesh->mNumUVComponents[1] = numFaces;
+}
+
+void FindDegeneratesProcessTest::TearDown() {
+    delete mMesh;
+    delete mProcess;
+}
+
+TEST_F(FindDegeneratesProcessTest, testDegeneratesDetection) {
+    mProcess->EnableInstantRemoval(false);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    unsigned int out = 0;
+    for (unsigned int i = 0; i < 1000; ++i) {
+        aiFace &f = mMesh->mFaces[i];
+        out += f.mNumIndices;
+    }
+
+    EXPECT_EQ(1000U, mMesh->mNumFaces);
+    EXPECT_EQ(10000U, mMesh->mNumVertices);
+    EXPECT_EQ(out, mMesh->mNumUVComponents[0]);
+    EXPECT_EQ(static_cast<unsigned int>(
+                      aiPrimitiveType_LINE | aiPrimitiveType_POINT |
+                      aiPrimitiveType_POLYGON | aiPrimitiveType_TRIANGLE),
+            mMesh->mPrimitiveTypes);
+}
+
+TEST_F(FindDegeneratesProcessTest, testDegeneratesRemoval) {
+    mProcess->EnableAreaCheck(false);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    EXPECT_EQ(mMesh->mNumUVComponents[1], mMesh->mNumFaces);
+}
+
+TEST_F(FindDegeneratesProcessTest, testDegeneratesRemovalWithAreaCheck) {
+    mProcess->EnableAreaCheck(true);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    EXPECT_EQ(mMesh->mNumUVComponents[1] - 100, mMesh->mNumFaces);
+}
+
+namespace
+{
+    std::unique_ptr<aiMesh> getDegenerateMesh()
+    {
+        std::unique_ptr<aiMesh> mesh(new aiMesh);
+        mesh->mNumVertices = 2;
+        mesh->mVertices = new aiVector3D[2];
+        mesh->mVertices[0] = aiVector3D{ 0.0f, 0.0f, 0.0f };
+        mesh->mVertices[1] = aiVector3D{ 1.0f, 0.0f, 0.0f };
+        mesh->mNumFaces = 1;
+        mesh->mFaces = new aiFace[1];
+        mesh->mFaces[0].mNumIndices = 3;
+        mesh->mFaces[0].mIndices = new unsigned int[3];
+        mesh->mFaces[0].mIndices[0] = 0;
+        mesh->mFaces[0].mIndices[1] = 1;
+        mesh->mFaces[0].mIndices[2] = 0;
+        return mesh;
+    }
+}
+
+TEST_F(FindDegeneratesProcessTest, meshRemoval) {
+    mProcess->EnableAreaCheck(true);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    std::unique_ptr<aiScene> scene(new aiScene);
+    scene->mNumMeshes = 5;
+    scene->mMeshes = new aiMesh*[5];
+
+    /// Use the mesh which doesn't get completely stripped of faces from the main test.
+    aiMesh* meshWhichSurvives = mMesh;
+    mMesh = nullptr;
+
+    scene->mMeshes[0] = getDegenerateMesh().release();
+    scene->mMeshes[1] = getDegenerateMesh().release();
+    scene->mMeshes[2] = meshWhichSurvives;
+    scene->mMeshes[3] = getDegenerateMesh().release();
+    scene->mMeshes[4] = getDegenerateMesh().release();
+
+    scene->mRootNode = new aiNode;
+    scene->mRootNode->mNumMeshes = 5;
+    scene->mRootNode->mMeshes = new unsigned int[5];
+    scene->mRootNode->mMeshes[0] = 0;
+    scene->mRootNode->mMeshes[1] = 1;
+    scene->mRootNode->mMeshes[2] = 2;
+    scene->mRootNode->mMeshes[3] = 3;
+    scene->mRootNode->mMeshes[4] = 4;
+
+    mProcess->Execute(scene.get());
+
+    EXPECT_EQ(scene->mNumMeshes, 1u);
+    EXPECT_EQ(scene->mMeshes[0], meshWhichSurvives);
+    EXPECT_EQ(scene->mRootNode->mNumMeshes, 1u);
+    EXPECT_EQ(scene->mRootNode->mMeshes[0], 0u);
+}
+
+TEST_F(FindDegeneratesProcessTest, invalidVertexIndex) {
+    mProcess->EnableAreaCheck(true);
+    mProcess->EnableInstantRemoval(true);
+    mProcess->ExecuteOnMesh(mMesh);
+
+    std::unique_ptr<aiScene> scene(new aiScene);
+    scene->mNumMeshes = 1;
+    scene->mMeshes = new aiMesh *[1];
+
+    std::unique_ptr<aiMesh> mesh(new aiMesh);
+    mesh->mNumVertices = 1;
+    mesh->mVertices = new aiVector3D[1];
+    mesh->mVertices[0] = aiVector3D{ 0.0f, 0.0f, 0.0f };
+    mesh->mNumFaces = 1;
+    mesh->mFaces = new aiFace[1];
+    mesh->mFaces[0].mNumIndices = 3;
+    mesh->mFaces[0].mIndices = new unsigned int[3];
+    mesh->mFaces[0].mIndices[0] = 0;
+    mesh->mFaces[0].mIndices[1] = 1;
+    mesh->mFaces[0].mIndices[2] = 99999;
+
+    scene->mMeshes[0] = mesh.release();
+
+    scene->mRootNode = new aiNode;
+    scene->mRootNode->mNumMeshes = 1;
+    scene->mRootNode->mMeshes = new unsigned int[1];
+    scene->mRootNode->mMeshes[0] = 0;
+
+    mProcess->Execute(scene.get());
+
+    EXPECT_EQ(scene->mNumMeshes, 1u);
+    EXPECT_EQ(scene->mRootNode->mNumMeshes, 1u);
+    EXPECT_EQ(scene->mRootNode->mMeshes[0], 0u);
+}

vendor/assimp/test/unit/utFindInvalidData.cpp

@@ -0,0 +1,145 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include "PostProcessing/FindInvalidDataProcess.h"
+#include <assimp/mesh.h>
+
+using namespace std;
+using namespace Assimp;
+
+class utFindInvalidDataProcess : public ::testing::Test {
+public:
+    utFindInvalidDataProcess() :
+            Test(), mMesh(nullptr), mProcess(nullptr) {
+        // empty
+    }
+
+protected:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    aiMesh *mMesh;
+    FindInvalidDataProcess *mProcess;
+};
+
+// ------------------------------------------------------------------------------------------------
+void utFindInvalidDataProcess::SetUp() {
+    ASSERT_TRUE(AI_MAX_NUMBER_OF_TEXTURECOORDS >= 3);
+
+    mProcess = new FindInvalidDataProcess();
+    mMesh = new aiMesh();
+
+    mMesh->mNumVertices = 1000;
+    mMesh->mVertices = new aiVector3D[1000];
+    for (unsigned int i = 0; i < 1000; ++i) {
+        mMesh->mVertices[i] = aiVector3D((float)i);
+    }
+
+    mMesh->mNormals = new aiVector3D[1000];
+    for (unsigned int i = 0; i < 1000; ++i) {
+        mMesh->mNormals[i] = aiVector3D((float)i + 1);
+    }
+
+    mMesh->mTangents = new aiVector3D[1000];
+    for (unsigned int i = 0; i < 1000; ++i) {
+        mMesh->mTangents[i] = aiVector3D((float)i);
+    }
+
+    mMesh->mBitangents = new aiVector3D[1000];
+    for (unsigned int i = 0; i < 1000; ++i) {
+        mMesh->mBitangents[i] = aiVector3D((float)i);
+    }
+
+    for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++a) {
+        mMesh->mTextureCoords[a] = new aiVector3D[1000];
+        for (unsigned int i = 0; i < 1000; ++i) {
+            mMesh->mTextureCoords[a][i] = aiVector3D((float)i);
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void utFindInvalidDataProcess::TearDown() {
+    delete mProcess;
+    delete mMesh;
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(utFindInvalidDataProcess, testStepNegativeResult) {
+    for ( size_t i=0; i<mMesh->mNumVertices; ++i ) {
+        mMesh->mNormals[i].x = mMesh->mNormals[i].y = mMesh->mNormals[i].z =0;
+        mMesh->mBitangents[i].x = mMesh->mBitangents[i].y = mMesh->mBitangents[i].z = 0;
+    }
+
+    mMesh->mTextureCoords[2][455] = aiVector3D(std::numeric_limits<float>::quiet_NaN());
+
+    mProcess->ProcessMesh(mMesh);
+
+    EXPECT_TRUE(nullptr != mMesh->mVertices);
+    EXPECT_EQ(nullptr, mMesh->mNormals);
+    EXPECT_EQ(nullptr, mMesh->mTangents);
+    EXPECT_EQ(nullptr, mMesh->mBitangents);
+
+    for (unsigned int i = 0; i < 2; ++i) {
+        EXPECT_TRUE(nullptr != mMesh->mTextureCoords[i]);
+    }
+
+    for (unsigned int i = 2; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
+        EXPECT_EQ(nullptr, mMesh->mTextureCoords[i]);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(utFindInvalidDataProcess, testStepPositiveResult) {
+    mProcess->ProcessMesh(mMesh);
+
+    EXPECT_NE(nullptr, mMesh->mVertices);
+
+    EXPECT_NE(nullptr, mMesh->mNormals);
+    EXPECT_NE(nullptr, mMesh->mTangents);
+    EXPECT_NE(nullptr, mMesh->mBitangents);
+
+    for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
+        EXPECT_NE(nullptr, mMesh->mTextureCoords[i]);
+    }
+}

vendor/assimp/test/unit/utFixInfacingNormals.cpp

@@ -0,0 +1,43 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"

vendor/assimp/test/unit/utGenBoundingBoxesProcess.cpp

@@ -0,0 +1,93 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include "PostProcessing/GenBoundingBoxesProcess.h"
+#include <assimp/mesh.h>
+#include <assimp/scene.h>
+
+using namespace Assimp;
+
+class utGenBoundingBoxesProcess : public ::testing::Test {
+public:
+    utGenBoundingBoxesProcess() :
+            Test(), mProcess(nullptr), mMesh(nullptr), mScene(nullptr) {
+        // empty
+    }
+
+    void SetUp() override {
+        mProcess = new GenBoundingBoxesProcess;
+        mMesh = new aiMesh();
+        mMesh->mNumVertices = 100;
+        mMesh->mVertices = new aiVector3D[100];
+        for (unsigned int i = 0; i < 100; ++i) {
+            mMesh->mVertices[i] = aiVector3D((ai_real)i, (ai_real)i, (ai_real)i);
+        }
+        mScene = new aiScene();
+        mScene->mNumMeshes = 1;
+        mScene->mMeshes = new aiMesh *[1];
+        mScene->mMeshes[0] = mMesh;
+    }
+
+    void TearDown() override {
+        delete mProcess;
+        delete mScene;
+    }
+
+protected:
+    GenBoundingBoxesProcess *mProcess;
+    aiMesh *mMesh;
+    aiScene *mScene;
+};
+
+TEST_F(utGenBoundingBoxesProcess, executeTest) {
+    mProcess->Execute(mScene);
+
+    aiMesh *mesh = mScene->mMeshes[0];
+    EXPECT_NE(nullptr, mesh);
+    EXPECT_EQ(0, mesh->mAABB.mMin.x);
+    EXPECT_EQ(0, mesh->mAABB.mMin.y);
+    EXPECT_EQ(0, mesh->mAABB.mMin.z);
+
+    EXPECT_EQ(99, mesh->mAABB.mMax.x);
+    EXPECT_EQ(99, mesh->mAABB.mMax.y);
+    EXPECT_EQ(99, mesh->mAABB.mMax.z);
+}

vendor/assimp/test/unit/utGenNormals.cpp

@@ -0,0 +1,86 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include "PostProcessing/GenVertexNormalsProcess.h"
+
+using namespace ::std;
+using namespace ::Assimp;
+
+class GenNormalsTest : public ::testing::Test {
+public:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    aiMesh *pcMesh;
+    GenVertexNormalsProcess *piProcess;
+};
+
+// ------------------------------------------------------------------------------------------------
+void GenNormalsTest::SetUp() {
+    piProcess = new GenVertexNormalsProcess();
+    pcMesh = new aiMesh();
+    pcMesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
+    pcMesh->mNumFaces = 1;
+    pcMesh->mFaces = new aiFace[1];
+    pcMesh->mFaces[0].mIndices = new unsigned int[pcMesh->mFaces[0].mNumIndices = 3];
+    pcMesh->mFaces[0].mIndices[0] = 0;
+    pcMesh->mFaces[0].mIndices[1] = 1;
+    pcMesh->mFaces[0].mIndices[2] = 1;
+    pcMesh->mNumVertices = 3;
+    pcMesh->mVertices = new aiVector3D[3];
+    pcMesh->mVertices[0] = aiVector3D(0.0f, 1.0f, 6.0f);
+    pcMesh->mVertices[1] = aiVector3D(2.0f, 3.0f, 1.0f);
+    pcMesh->mVertices[2] = aiVector3D(3.0f, 2.0f, 4.0f);
+}
+
+// ------------------------------------------------------------------------------------------------
+void GenNormalsTest::TearDown() {
+    delete this->pcMesh;
+    delete this->piProcess;
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(GenNormalsTest, testSimpleTriangle) {
+    piProcess->GenMeshVertexNormals(pcMesh, 0);
+    EXPECT_TRUE(pcMesh->mNormals != nullptr);
+}

vendor/assimp/test/unit/utHMPImportExport.cpp

@@ -0,0 +1,60 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utHMPImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/HMP/terrain.hmp", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utHMPImportExport, importHMPFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}

vendor/assimp/test/unit/utIFCImportExport.cpp

@@ -0,0 +1,80 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utIFCImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/IFC/AC14-FZK-Haus.ifc", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utIFCImportExport, importIFCFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utIFCImportExport, importComplextypeAsColor) {
+    std::string asset =
+            "ISO-10303-21;\n"
+            "HEADER;\n"
+            "FILE_DESCRIPTION( ( 'ViewDefinition [CoordinationView, SpaceBoundary2ndLevelAddOnView]', 'Option [Filter: ]' ), '2;1' );\n"
+            "FILE_NAME( 'S:\\[IFC]\\[COMPLETE-BUILDINGS]\\FZK-MODELS\\FZK-Haus\\ArchiCAD-14\\AC14-FZK-Haus.ifc', '2010-10-07T13:40:52', ( 'Architect' ), ( 'Building Designer Office' ), 'PreProc - EDM 5.0', 'ArchiCAD 14.00 Release 1. Windows Build Number of the Ifc 2x3 interface: 3427', 'The authorising person' );\n"
+            "FILE_SCHEMA( ( 'IFC2X3' ) );\n"
+            "ENDSEC;\n"
+            "\n"
+            "DATA;\n"
+            "#1 = IFCORGANIZATION( 'GS', 'Graphisoft', 'Graphisoft', $, $ );\n"
+            "#2 = IFCPROPERTYSINGLEVALUE( 'Red', $, IFCINTEGER( 255 ), $ );\n"
+            "#3 = IFCPROPERTYSINGLEVALUE( 'Green', $, IFCINTEGER( 255 ), $ );\n"
+            "#4 = IFCPROPERTYSINGLEVALUE( 'Blue', $, IFCINTEGER( 255 ), $ );\n"
+            "#5 = IFCCOMPLEXPROPERTY( 'Color', $, 'Color', ( #19, #20, #21 ) );\n";
+    Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFileFromMemory(asset.c_str(), asset.size(), 0);
+    EXPECT_EQ(nullptr, scene);
+}

vendor/assimp/test/unit/utIOStreamBuffer.cpp

@@ -0,0 +1,151 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"
+#include <assimp/IOStreamBuffer.h>
+#include "TestIOStream.h"
+#include "Tools/TestTools.h"
+#include "UnitTestFileGenerator.h"
+
+class IOStreamBufferTest : public ::testing::Test {
+    // empty
+};
+
+using namespace Assimp;
+
+TEST_F( IOStreamBufferTest, creationTest ) {
+    bool ok( true );
+    try {
+        IOStreamBuffer<char> myBuffer;
+    } catch ( ... ) {
+        ok = false;
+    }
+    EXPECT_TRUE( ok );
+}
+
+TEST_F( IOStreamBufferTest, accessCacheSizeTest ) {
+    IOStreamBuffer<char> myBuffer1;
+    EXPECT_NE( 0U, myBuffer1.cacheSize() );
+
+    IOStreamBuffer<char> myBuffer2( 100 );
+    EXPECT_EQ( 100U, myBuffer2.cacheSize() );
+}
+
+const char data[]{"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Qui\
+sque luctus sem diam, ut eleifend arcu auctor eu. Vestibulum id est vel nulla l\
+obortis malesuada ut sed turpis. Nulla a volutpat tortor. Nunc vestibulum portt\
+itor sapien ornare sagittis volutpat."};
+
+
+TEST_F( IOStreamBufferTest, open_close_Test ) {
+    IOStreamBuffer<char> myBuffer;
+
+    EXPECT_FALSE( myBuffer.open( nullptr ) );
+    EXPECT_FALSE( myBuffer.close() );
+
+    const auto dataSize = sizeof(data);
+    const auto dataCount = dataSize / sizeof(*data);
+
+    char fname[]={ "octest.XXXXXX" };
+    std::string tmpName;
+    auto* fs = MakeTmpFile(fname, std::strlen(fname), tmpName);
+    ASSERT_NE(nullptr, fs);
+
+    auto written = std::fwrite(data, sizeof(*data), dataCount, fs);
+    EXPECT_NE( 0U, written );
+    auto flushResult = std::fflush( fs );
+	ASSERT_EQ(0, flushResult);
+	fclose(fs);
+
+    FILE *new_fs{ nullptr };
+    EXPECT_TRUE(Unittest::TestTools::openFilestream(&new_fs, tmpName.c_str(), "r"));
+    ASSERT_NE(nullptr, new_fs);
+    {
+        TestDefaultIOStream myStream(new_fs, fname);
+
+        EXPECT_TRUE( myBuffer.open( &myStream ) );
+        EXPECT_FALSE( myBuffer.open( &myStream ) );
+        EXPECT_TRUE( myBuffer.close() );
+    }
+    remove(fname);
+}
+
+TEST_F( IOStreamBufferTest, readlineTest ) {
+
+    const auto dataSize = sizeof(data);
+    const auto dataCount = dataSize / sizeof(*data);
+
+    char fname[]={ "readlinetest.XXXXXX\0" };
+    std::string tmpName;
+    auto* fs = MakeTmpFile(fname, std::strlen(fname), tmpName);
+    ASSERT_NE(nullptr, fs);
+
+    auto written = std::fwrite( data, sizeof(*data), dataCount, fs );
+    EXPECT_NE( 0U, written );
+
+	auto flushResult = std::fflush(fs);
+	ASSERT_EQ(0, flushResult);
+	std::fclose(fs);
+
+    FILE *new_fs{ nullptr };
+    EXPECT_TRUE(Unittest::TestTools::openFilestream(&new_fs, tmpName.c_str(), "r"));
+    ASSERT_NE(nullptr, new_fs);
+
+    const auto tCacheSize = 26u;
+
+    IOStreamBuffer<char> myBuffer(tCacheSize);
+    EXPECT_EQ(tCacheSize, myBuffer.cacheSize());
+
+    TestDefaultIOStream myStream(new_fs, fname);
+    auto size = myStream.FileSize();
+    auto numBlocks = size / myBuffer.cacheSize();
+    if ( size % myBuffer.cacheSize() > 0 ) {
+        numBlocks++;
+    }
+    EXPECT_TRUE(myBuffer.open(&myStream));
+    EXPECT_EQ(numBlocks, myBuffer.getNumBlocks() );
+    EXPECT_TRUE(myBuffer.close() );
+}
+
+TEST_F( IOStreamBufferTest, accessBlockIndexTest ) {
+
+}
+

vendor/assimp/test/unit/utIOSystem.cpp

@@ -0,0 +1,79 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+#include "TestIOSystem.h"
+
+#include <assimp/IOSystem.hpp>
+
+using namespace std;
+using namespace Assimp;
+
+class IOSystemTest : public ::testing::Test {
+public:
+    virtual void SetUp() {
+        pImp = new TestIOSystem();
+    }
+
+    virtual void TearDown() {
+        delete pImp;
+    }
+
+protected:
+    TestIOSystem* pImp;
+};
+
+TEST_F( IOSystemTest, accessDirectoryStackTest ) {
+    EXPECT_FALSE( pImp->PopDirectory() );
+    EXPECT_EQ( 0U, pImp->StackSize() );
+    EXPECT_FALSE( pImp->PushDirectory( "" ) );
+    std::string path = "test/";
+    EXPECT_TRUE( pImp->PushDirectory( path ) );
+    EXPECT_EQ( 1U, pImp->StackSize() );
+    EXPECT_EQ( path, pImp->CurrentDirectory() );
+    EXPECT_TRUE( pImp->PopDirectory() );
+    EXPECT_EQ( 0U, pImp->StackSize() );
+}
+
+TEST_F( IOSystemTest, delFileTest ) {
+    EXPECT_FALSE( pImp->DeleteFile( "none" ) );
+}

vendor/assimp/test/unit/utImporter.cpp

@@ -0,0 +1,397 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include "../../include/assimp/postprocess.h"
+#include "../../include/assimp/scene.h"
+#include "TestIOSystem.h"
+#include <assimp/BaseImporter.h>
+#include <assimp/DefaultIOSystem.h>
+#include <assimp/Importer.hpp>
+
+using namespace ::std;
+using namespace ::Assimp;
+
+class ImporterTest : public ::testing::Test {
+protected:
+    void SetUp() override {
+        pImp = new Importer();
+    }
+
+    void TearDown() override {
+        delete pImp;
+    }
+
+    Importer *pImp;
+};
+
+#define InputData_BLOCK_SIZE 1310
+
+// clang-format off
+// test data for Importer::ReadFileFromMemory() - ./test/3DS/CameraRollAnim.3ds
+static unsigned char InputData_abRawBlock[1310] = {
+     77, 77, 30,  5,  0,  0,  2,  0, 10,  0,  0,  0,  3,  0,  0,  0, 61, 61, 91,  3,  0,  0,
+     62, 61, 10,  0,  0,  0,  3,  0,  0,  0,  0,  1, 10,  0,  0,  0,  0,  0,128, 63,  0, 64,
+    254,  2,  0,  0, 66,111,120, 48, 49,  0,  0, 65,242,  2,  0,  0, 16, 65, 64,  1,  0,  0,
+     26,  0,102, 74,198,193,102, 74,198,193,  0,  0,  0,  0,205,121, 55, 66,102, 74,198,193,
+      0,  0,  0,  0,102, 74,198,193,138,157,184, 65,  0,  0,  0,  0,205,121, 55, 66,138,157,
+    184, 65,  0,  0,  0,  0,102, 74,198,193,102, 74,198,193, 90,252, 26, 66,205,121, 55, 66,
+    102, 74,198,193, 90,252, 26, 66,102, 74,198,193,138,157,184, 65, 90,252, 26, 66,205,121,
+     55, 66,138,157,184, 65, 90,252, 26, 66,102, 74,198,193,102, 74,198,193,  0,  0,  0,  0,
+    205,121, 55, 66,102, 74,198,193,  0,  0,  0,  0,205,121, 55, 66,102, 74,198,193, 90,252,
+    26,  66,205,121, 55, 66,102, 74,198,193, 90,252, 26, 66,102, 74,198,193,102, 74,198,193,
+    90, 252, 26, 66,102, 74,198,193,102, 74,198,193,  0,  0,  0,  0,205,121, 55, 66,138,157,
+    184, 65,  0,  0,  0,  0,205,121, 55, 66,102, 74,198,193, 90,252, 26, 66,205,121, 55, 66,
+    138,157,184, 65,  0,  0,  0,  0,102, 74,198,193,138,157,184, 65,  0,  0,  0,  0,102, 74,
+    198,193,138,157,184, 65, 90,252, 26, 66,102, 74,198,193,138,157,184, 65, 90,252, 26, 66,
+    205,121, 55, 66,138,157,184, 65, 90,252, 26, 66,205,121, 55, 66,138,157,184, 65,  0,  0,
+      0,  0,102, 74,198,193,138,157,184, 65,  0,  0,  0,  0,102, 74,198,193,102, 74,198,193,
+     90,252, 26, 66,102, 74,198,193,102, 74,198,193, 90,252, 26, 66,102, 74,198,193,138,157,
+    184, 65,  0,  0,  0,  0, 64, 65,216,  0,  0,  0, 26,  0,  0,  0,128, 63,  0,  0,  0,  0,
+      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,128, 63,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,
+    128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,
+      0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+    128, 63,  0,  0,  0,  0,  0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,
+      0,  0,  0,  0,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,128, 63,  0,  0,
+      0,  0,  0,  0,  0,  0,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,128, 63,
+      0,  0,  0,  0,  0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  0,  0,
+      0,  0,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+      0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,
+      0,  0, 96, 65, 54,  0,  0,  0,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+      0,  0,  0,  0,128, 63,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,128, 63,
+     53,169, 40, 65,176,205, 90,191,  0,  0,  0,  0, 32, 65,158,  0,  0,  0, 12,  0,  0,  0,
+      2,  0,  3,  0,  6,  0,  3,  0,  1,  0,  0,  0,  6,  0,  4,  0,  5,  0,  7,  0,  6,  0,
+      7,  0,  6,  0,  4,  0,  6,  0,  8,  0,  9,  0, 10,  0,  6,  0, 11,  0, 12,  0, 13,  0,
+      6,  0,  1,  0, 14,  0,  7,  0,  6,  0,  7,  0, 15,  0,  1,  0,  6,  0, 16,  0, 17,  0,
+     18,  0,  6,  0, 19,  0, 20,  0, 21,  0,  6,  0, 22,  0,  0,  0, 23,  0,  6,  0, 24,  0,
+      6,  0, 25,  0,  6,  0, 80, 65, 54,  0,  0,  0,  2,  0,  0,  0,  2,  0,  0,  0,  4,  0,
+      0,  0,  4,  0,  0,  0,  8,  0,  0,  0,  8,  0,  0,  0, 16,  0,  0,  0, 16,  0,  0,  0,
+     32,  0,  0,  0, 32,  0,  0,  0, 64,  0,  0,  0, 64,  0,  0,  0,  0, 64, 67,  0,  0,  0,
+     67, 97,109,101,114, 97, 48, 49,  0,  0, 71, 52,  0,  0,  0,189, 19, 25,195,136,104, 81,
+     64,147, 56,182, 65, 96,233, 20,194, 67,196, 97,190,147, 56,182, 65,  0,  0,  0,  0, 85,
+     85, 85, 66, 32, 71, 14,  0,  0,  0,  0,  0,  0,  0,  0,  0,122, 68,  0,176,179,  1,  0,
+      0, 10,176, 21,  0,  0,  0,  5,  0, 77, 65, 88, 83, 67, 69, 78, 69,  0, 44,  1,  0,  0,
+      8,176, 14,  0,  0,  0,  0,  0,  0,  0, 44,  1,  0,  0,  9,176, 10,  0,  0,  0,128,  2,
+      0,  0,  2,176,168,  0,  0,  0, 48,176,  8,  0,  0,  0,  0,  0, 16,176, 18,  0,  0,  0,
+     66,111,120, 48, 49,  0,  0, 64,  0,  0,255,255, 19,176, 18,  0,  0,  0,  0,  0,  0,128,
+      0,  0,  0,128,  0,  0,  0,128, 32,176, 38,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+      0,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0, 53,169, 40, 65,176,205, 90,191,  0,  0,
+      0,  0, 33,176, 42,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,
+      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     34,176, 38,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,  0,  0,
+      0,  0,  0,  0,  0,  0,128, 63,  0,  0,128, 63,  0,  0,128, 63,  3,176,143,  0,  0,  0,
+     48,176,  8,  0,  0,  0,  1,  0, 16,176, 21,  0,  0,  0, 67, 97,109,101,114, 97, 48, 49,
+      0,  0, 64,  0,  0,255,255, 32,176, 38,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+      0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,189, 19, 25,195,136,104, 81, 64,147, 56,182,
+     65, 35,176, 30,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,  0,
+      0,  0,  0,  0,  0,  0,  0, 52, 66, 36,176, 40,  0,  0,  0,  0,  0,  0,  0,  0,  0,120,
+      0,  0,  0,  2,  0,  0,  0,  0,  0,  0,  0,  0,  0,120, 13, 90,189,120,  0,  0,  0,  0,
+      0, 99,156,154,194,  4,176, 73,  0,  0,  0, 48,176,  8,  0,  0,  0,  2,  0, 16,176, 21,
+      0,  0,  0, 67, 97,109,101,114, 97, 48, 49,  0,  0, 64,  0,  0,255,255, 32,176, 38,  0,
+      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0,
+     96,233, 20,194, 67,196, 97,190,147, 56,182, 65 };
+// clang-format on
+#define AIUT_DEF_ERROR_TEXT "sorry, this is a test"
+
+static const aiImporterDesc desc = {
+    "UNIT TEST - IMPORTER",
+    "",
+    "",
+    "",
+    0,
+    0,
+    0,
+    0,
+    0,
+    "apple mac linux windows"
+};
+
+class TestPlugin : public BaseImporter {
+public:
+    virtual bool CanRead(
+            const std::string &pFile, IOSystem * /*pIOHandler*/, bool /*test*/) const {
+        std::string::size_type pos = pFile.find_last_of('.');
+        // no file extension - can't read
+        if (pos == std::string::npos)
+            return false;
+        std::string extension = pFile.substr(pos);
+
+        // todo ... make case-insensitive
+        return (extension == ".apple" || extension == ".mac" ||
+                extension == ".linux" || extension == ".windows");
+    }
+
+    virtual const aiImporterDesc *GetInfo() const {
+        return &desc;
+    }
+
+    virtual void InternReadFile(
+            const std::string & /*pFile*/, aiScene * /*pScene*/, IOSystem * /*pIOHandler*/) {
+        throw DeadlyImportError(AIUT_DEF_ERROR_TEXT);
+    }
+};
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testMemoryRead) {
+    const aiScene *sc = pImp->ReadFileFromMemory(InputData_abRawBlock, InputData_BLOCK_SIZE,
+            aiProcessPreset_TargetRealtime_Quality, "3ds");
+
+    ASSERT_TRUE(sc != nullptr);
+    EXPECT_EQ(aiString("<3DSRoot>"), sc->mRootNode->mName);
+    EXPECT_EQ(1U, sc->mNumMeshes);
+    EXPECT_EQ(24U, sc->mMeshes[0]->mNumVertices);
+    EXPECT_EQ(12U, sc->mMeshes[0]->mNumFaces);
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testIntProperty) {
+    bool b = pImp->SetPropertyInteger("quakquak", 1503);
+    EXPECT_FALSE(b);
+    EXPECT_EQ(1503, pImp->GetPropertyInteger("quakquak", 0));
+    EXPECT_EQ(314159, pImp->GetPropertyInteger("not_there", 314159));
+
+    b = pImp->SetPropertyInteger("quakquak", 1504);
+    EXPECT_TRUE(b);
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testFloatProperty) {
+    bool b = pImp->SetPropertyFloat("quakquak", 1503.f);
+    EXPECT_TRUE(!b);
+    EXPECT_EQ(1503.f, pImp->GetPropertyFloat("quakquak", 0.f));
+    EXPECT_EQ(314159.f, pImp->GetPropertyFloat("not_there", 314159.f));
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testStringProperty) {
+    bool b = pImp->SetPropertyString("quakquak", "test");
+    EXPECT_TRUE(!b);
+    EXPECT_EQ("test", pImp->GetPropertyString("quakquak", "weghwekg"));
+    EXPECT_EQ("ILoveYou", pImp->GetPropertyString("not_there", "ILoveYou"));
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testPluginInterface) {
+    pImp->RegisterLoader(new TestPlugin());
+    EXPECT_TRUE(pImp->IsExtensionSupported(".apple"));
+    EXPECT_TRUE(pImp->IsExtensionSupported(".mac"));
+    EXPECT_TRUE(pImp->IsExtensionSupported("*.linux"));
+    EXPECT_TRUE(pImp->IsExtensionSupported("windows"));
+    EXPECT_TRUE(pImp->IsExtensionSupported(".x")); /* x and 3ds must be available in this Assimp build, of course! */
+    EXPECT_TRUE(pImp->IsExtensionSupported(".3ds"));
+    EXPECT_FALSE(pImp->IsExtensionSupported("."));
+
+    TestPlugin *p = (TestPlugin *)pImp->GetImporter(".windows");
+    ASSERT_TRUE(nullptr != p);
+
+    try {
+        p->InternReadFile("", nullptr, nullptr);
+    } catch (const DeadlyImportError &dead) {
+        EXPECT_TRUE(!strcmp(dead.what(), AIUT_DEF_ERROR_TEXT));
+
+        // unregister the plugin and delete it
+        pImp->UnregisterLoader(p);
+        delete p;
+
+        return;
+    }
+    EXPECT_TRUE(false); // control shouldn't reach this point
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testExtensionCheck) {
+    std::string s;
+    pImp->GetExtensionList(s);
+
+    // TODO
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(ImporterTest, testMultipleReads) {
+    // see http://sourceforge.net/projects/assimp/forums/forum/817654/topic/3591099
+    // Check whether reading and post-processing multiple times using
+    // the same objects is *generally* fine. This test doesn't target
+    // importers. Testing post-processing stability is the main point.
+
+    const unsigned int flags =
+            aiProcess_Triangulate |
+            aiProcess_JoinIdenticalVertices |
+            aiProcess_GenSmoothNormals |
+            aiProcess_ValidateDataStructure |
+            aiProcess_RemoveRedundantMaterials |
+            aiProcess_SortByPType |
+            aiProcess_FindDegenerates |
+            aiProcess_FindInvalidData |
+            aiProcess_GenUVCoords |
+            aiProcess_OptimizeMeshes |
+            aiProcess_OptimizeGraph;
+
+    EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/test.x", flags));
+    //EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/dwarf.x",flags)); # is in nonbsd
+    EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/Testwuson.X", flags));
+    EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/anim_test.x", flags));
+    //EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/dwarf.x",flags)); # is in nonbsd
+
+    EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/anim_test.x", flags));
+    EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/BCN_Epileptic.X", flags));
+    //EXPECT_TRUE(pImp->ReadFile(ASSIMP_TEST_MODELS_DIR "/X/dwarf.x",flags)); # is in nonbsd
+}
+
+TEST_F(ImporterTest, SearchFileHeaderForTokenTest) {
+    //DefaultIOSystem ioSystem;
+    //    BaseImporter::SearchFileHeaderForToken( &ioSystem, assetPath, Token, 2 )
+}
+
+namespace {
+// Description for an importer which fails in specific ways.
+aiImporterDesc s_failingImporterDescription = {
+    "Failing importer",
+    "assimp team",
+    "",
+    "",
+    0,
+    1,
+    0,
+    1,
+    0,
+    "fail"
+};
+
+// This importer fails in specific ways.
+class FailingImporter : public Assimp::BaseImporter {
+public:
+    virtual ~FailingImporter() = default;
+    bool CanRead(const std::string &, Assimp::IOSystem *, bool) const override {
+        return true;
+    }
+
+protected:
+    const aiImporterDesc *GetInfo() const override {
+        return &s_failingImporterDescription;
+    }
+
+    void InternReadFile(const std::string &pFile, aiScene *, Assimp::IOSystem *) override {
+        if (pFile == "deadlyImportError.fail") {
+            throw DeadlyImportError("Deadly import error test. Details: ", 42, " More Details: ", "Failure");
+        } else if (pFile == "stdException.fail") {
+            throw std::runtime_error("std::exception test");
+        } else if (pFile == "unexpectedException.fail") {
+            throw 5;
+        }
+    }
+};
+} // namespace
+
+TEST_F(ImporterTest, deadlyImportError) {
+    pImp->RegisterLoader(new FailingImporter);
+    pImp->SetIOHandler(new TestIOSystem);
+    const aiScene *scene = pImp->ReadFile("deadlyImportError.fail", 0);
+    EXPECT_EQ(scene, nullptr);
+    EXPECT_STREQ(pImp->GetErrorString(), "Deadly import error test. Details: 42 More Details: Failure");
+    EXPECT_NE(pImp->GetException(), std::exception_ptr());
+}
+
+TEST_F(ImporterTest, stdException) {
+    pImp->RegisterLoader(new FailingImporter);
+    pImp->SetIOHandler(new TestIOSystem);
+    const aiScene *scene = pImp->ReadFile("stdException.fail", 0);
+    EXPECT_EQ(scene, nullptr);
+    EXPECT_STREQ(pImp->GetErrorString(), "std::exception test");
+    EXPECT_NE(pImp->GetException(), std::exception_ptr());
+    try {
+        std::rethrow_exception(pImp->GetException());
+    } catch (const std::exception &e) {
+        EXPECT_STREQ(e.what(), "std::exception test");
+    } catch (...) {
+        EXPECT_TRUE(false);
+    }
+}
+
+TEST_F(ImporterTest, unexpectedException) {
+    pImp->RegisterLoader(new FailingImporter);
+    pImp->SetIOHandler(new TestIOSystem);
+    const aiScene *scene = pImp->ReadFile("unexpectedException.fail", 0);
+
+    EXPECT_EQ(scene, nullptr);
+    EXPECT_STREQ(pImp->GetErrorString(), "Unknown exception");
+    ASSERT_NE(pImp->GetException(), std::exception_ptr());
+    try {
+        std::rethrow_exception(pImp->GetException());
+    } catch (int x) {
+        EXPECT_EQ(x, 5);
+    } catch (...) {
+        EXPECT_TRUE(false);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+
+struct ExtensionTestCase {
+    std::string testName;
+    std::string filename;
+    std::string getExtensionResult;
+    std::string hasExtension;
+    bool hasExtensionResult;
+};
+
+using ExtensionTest = ::testing::TestWithParam<ExtensionTestCase>;
+
+TEST_P(ExtensionTest, testGetAndHasExtension) {
+    const ExtensionTestCase& testCase = GetParam();
+    EXPECT_EQ(testCase.getExtensionResult, BaseImporter::GetExtension(testCase.filename));
+    EXPECT_EQ(testCase.hasExtensionResult, BaseImporter::HasExtension(testCase.filename, {testCase.hasExtension}));
+}
+
+INSTANTIATE_TEST_SUITE_P(
+    ExtensionTests, ExtensionTest,
+    ::testing::ValuesIn<ExtensionTestCase>({
+        {"NoExtension", "name", "", "glb", false},
+        {"NoExtensionAndEmptyVersion", "name#", "", "glb", false},
+        {"WithExtensionAndEmptyVersion", "name.glb#", "glb#", "glb", false},
+        {"WithExtensionAndVersion", "name.glb#1234", "glb", "glb", true},
+        {"WithExtensionAndHashInStem", "name#1234.glb", "glb", "glb", true},
+        {"WithExtensionAndInvalidVersion", "name.glb#_", "glb#_", "glb", false},
+        {"WithExtensionAndDotAndHashInStem", "name.glb#.abc", "abc", "glb", false},
+        {"WithTwoExtensions", "name.abc.def", "def", "abc.def", true},
+    }),
+    [](const ::testing::TestParamInfo<ExtensionTest::ParamType>& info) {
+        return info.param.testName;
+    });

vendor/assimp/test/unit/utImproveCacheLocality.cpp

@@ -0,0 +1,42 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "UnitTestPCH.h"

vendor/assimp/test/unit/utIssues.cpp

@@ -0,0 +1,83 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+#include <assimp/Exporter.hpp>
+#include <assimp/postprocess.h>
+
+#include "TestModelFactory.h"
+
+using namespace Assimp;
+
+class utIssues : public ::testing::Test {};
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+
+TEST_F( utIssues, OpacityBugWhenExporting_727 ) {
+    float opacity;
+    aiScene *scene = TestModelFactory::createDefaultTestModel(opacity);
+    Assimp::Importer importer;
+    Assimp::Exporter exporter;
+
+    const aiExportFormatDesc *desc = exporter.GetExportFormatDescription( 0 );
+    ASSERT_NE( desc, nullptr );
+
+    std::string path = "dae";
+    path.append(".");
+    path.append( desc->fileExtension );
+    EXPECT_EQ( AI_SUCCESS, exporter.Export( scene, desc->id, path ) );
+    const aiScene *newScene( importer.ReadFile( path, aiProcess_ValidateDataStructure ) );
+    ASSERT_NE( nullptr, newScene );
+    float newOpacity;
+    if (newScene->mNumMaterials > 0 ) {
+        EXPECT_EQ( AI_SUCCESS, newScene->mMaterials[ 0 ]->Get( AI_MATKEY_OPACITY, newOpacity ) );
+        EXPECT_FLOAT_EQ( opacity, newOpacity );
+    }
+    
+    TestModelFactory::releaseDefaultTestModel(&scene);
+
+    // Cleanup. Delete exported dae.dae file
+    EXPECT_EQ(0, std::remove(path.c_str()));
+}
+
+#endif // ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/utJoinVertices.cpp

@@ -0,0 +1,142 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include <assimp/scene.h>
+
+#include "PostProcessing/JoinVerticesProcess.h"
+
+using namespace std;
+using namespace Assimp;
+
+class utJoinVertices : public ::testing::Test {
+public:
+    utJoinVertices() :
+            Test(), piProcess(nullptr), pcMesh(nullptr) {
+        // empty
+    }
+
+protected:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    JoinVerticesProcess *piProcess;
+    aiMesh *pcMesh;
+};
+
+// ------------------------------------------------------------------------------------------------
+void utJoinVertices::SetUp() {
+    // construct the process
+    piProcess = new JoinVerticesProcess();
+
+    // create a quite small mesh for testing purposes -
+    // the mesh itself is *something* but it has redundant vertices
+    pcMesh = new aiMesh();
+
+    pcMesh->mNumVertices = 900;
+    aiVector3D *&pv = pcMesh->mVertices = new aiVector3D[900];
+    for (unsigned int i = 0; i < 3; ++i) {
+        const unsigned int base = i * 300;
+        for (unsigned int a = 0; a < 300; ++a) {
+            pv[base + a].x = pv[base + a].y = pv[base + a].z = (float)a;
+        }
+    }
+
+    // generate faces - each vertex is referenced once
+    pcMesh->mNumFaces = 300;
+    pcMesh->mFaces = new aiFace[300];
+    for (unsigned int i = 0, p = 0; i < 300; ++i) {
+        aiFace &face = pcMesh->mFaces[i];
+        face.mIndices = new unsigned int[face.mNumIndices = 3];
+        for (unsigned int a = 0; a < 3; ++a) {
+            face.mIndices[a] = p++;
+        }
+    }
+
+    // generate extra members - set them to zero to make sure they're identical
+    pcMesh->mTextureCoords[0] = new aiVector3D[900];
+    pcMesh->mBitangents = new aiVector3D[900];
+    pcMesh->mNormals = new aiVector3D[900];
+    pcMesh->mTangents = new aiVector3D[900];
+    for (unsigned int i = 0; i < 900; ++i) {
+        pcMesh->mTextureCoords[0][i] = aiVector3D(0.f);
+        pcMesh->mNormals[i] = aiVector3D(0.f);
+        pcMesh->mTangents[i] = aiVector3D(0.f);
+        pcMesh->mBitangents[i] = aiVector3D(0.f);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void utJoinVertices::TearDown() {
+    delete this->pcMesh;
+    pcMesh = nullptr;
+    delete this->piProcess;
+    piProcess = nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(utJoinVertices, testProcess) {
+    // execute the step on the given data
+    piProcess->ProcessMesh(pcMesh, 0);
+
+    // the number of faces shouldn't change
+    ASSERT_EQ(300U, pcMesh->mNumFaces);
+    ASSERT_EQ(300U, pcMesh->mNumVertices);
+
+    ASSERT_TRUE(nullptr != pcMesh->mNormals);
+    ASSERT_TRUE(nullptr != pcMesh->mTangents);
+    ASSERT_TRUE(nullptr != pcMesh->mBitangents);
+    ASSERT_TRUE(nullptr != pcMesh->mTextureCoords[0]);
+
+    // the order doesn't care
+    float fSum = 0.f;
+    for (unsigned int i = 0; i < 300; ++i) {
+        aiVector3D &v = pcMesh->mVertices[i];
+        fSum += v.x + v.y + v.z;
+
+        EXPECT_FALSE(pcMesh->mNormals[i].x);
+        EXPECT_FALSE(pcMesh->mTangents[i].x);
+        EXPECT_FALSE(pcMesh->mBitangents[i].x);
+        EXPECT_FALSE(pcMesh->mTextureCoords[0][i].x);
+    }
+    EXPECT_EQ(150.f * 299.f * 3.f, fSum); // gaussian sum equation
+}

vendor/assimp/test/unit/utLWOImportExport.cpp

@@ -0,0 +1,389 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/scene.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utLWOImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/boxuv.lwo", aiProcess_ValidateDataStructure);
+
+        EXPECT_EQ(1u, scene->mNumMeshes);
+        EXPECT_NE(nullptr, scene->mMeshes[0]);
+        EXPECT_EQ(24u, scene->mMeshes[0]->mNumVertices);
+
+        //This test model is using n-gons, so 6 faces instead of 12 tris
+        EXPECT_EQ(6u, scene->mMeshes[0]->mNumFaces);
+        EXPECT_EQ(aiPrimitiveType_POLYGON, scene->mMeshes[0]->mPrimitiveTypes);
+        EXPECT_EQ(true, scene->mMeshes[0]->HasTextureCoords(0));
+
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utLWOImportExport, importLWObox_uv) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utLWOImportExport, importLWOformatdetection) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/formatDetection", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOempty) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/invalid/empty.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_EQ(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWObox_2uv_1unused) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/box_2uv_1unused.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWObox_2vc_1unused) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/box_2vc_1unused.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOconcave_polygon) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/concave_polygon.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOconcave_self_intersecting) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/concave_self_intersecting.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOhierarchy) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/hierarchy.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOhierarchy_smoothed) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/hierarchy_smoothed.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_cylindrical_x) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_cylindrical_x.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_cylindrical_x_scale_222_wrap_21) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_cylindrical_x_scale_222_wrap_21.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_cylindrical_y) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_cylindrical_y.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_cylindrical_y_scale_111) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_cylindrical_y_scale_111.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_cylindrical_y_scale_111_wrap_21) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_cylindrical_y_scale_111_wrap_21.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_cylindrical_z) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_cylindrical_z.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_planar_x) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_planar_x.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_planar_y) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_planar_y.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_planar_z) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_planar_z.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_planar_z_scale_111) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_planar_z_scale_111.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_spherical_x) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_spherical_x.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_spherical_x_scale_222_wrap_22) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_spherical_x_scale_222_wrap_22.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_spherical_y) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_spherical_y.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_spherical_) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_spherical_z.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_spherical_z_wrap_22) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_spherical_z_wrap_22.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOearth_uv_cylindrical_y) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/MappingModes/earth_uv_cylindrical_y.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOModoExport_vertNormals) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/ModoExport_vertNormals.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOnonplanar_polygon) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/nonplanar_polygon.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOCellShader) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/shader_test/CellShader.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOfastFresne) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/shader_test/fastFresnel.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOrealFresnel) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/shader_test/realFresnel.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOSuperCellShader) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/shader_test/SuperCellShader.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOsphere_with_gradient) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/sphere_with_gradient.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOsphere_with_mat_gloss_10pc) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/sphere_with_mat_gloss_10pc.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOSubdivision) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/Subdivision.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOtransparency) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/transparency.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOUglyVertexColors) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/UglyVertexColors.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOuvtest) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWO2/uvtest.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOBConcavePolygon) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWOB/ConcavePolygon.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOBbluewithcylindrictex) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWOB/MappingModes/bluewithcylindrictexz.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOBsphere_with_mat_gloss_10pc) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWOB/sphere_with_mat_gloss_10pc.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}
+
+
+TEST_F(utLWOImportExport, importLWOBsphere_with_mat_gloss_50pc) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWO/LWOB/sphere_with_mat_gloss_50pc.lwo", aiProcess_ValidateDataStructure);
+
+    EXPECT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utLWSImportExport.cpp

@@ -0,0 +1,138 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utLWSImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x.lws", aiProcess_ValidateDataStructure);
+        return nullptr != scene;
+    }
+};
+
+TEST_F(utLWSImportExport, importLWSFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_post_linear) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_post_linear.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_xz_bezier) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_xz_bezier.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_xz_stepped) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_xz_stepped.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_oldformat_56) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_oldformat_56.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_post_offset_repeat) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_post_offset_repeat.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_xz_hermite) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_xz_hermite.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_y_pre_ofrep_post_osc) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_y_pre_ofrep_post_osc.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_oldformat_6) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_oldformat_6.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_post_repeat) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_post_repeat.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_xz_linear) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_xz_linear.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_post_constant) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_post_constant.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_x_post_reset) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_x_post_reset.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}
+
+TEST_F(utLWSImportExport, importLWSmove_xz_spline) {
+    ::Assimp::Importer importer;
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/LWS/move_xz_spline.lws", aiProcess_ValidateDataStructure);
+    EXPECT_NE(nullptr, scene);
+}

vendor/assimp/test/unit/utLimitBoneWeights.cpp

@@ -0,0 +1,136 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+#include "UnitTestPCH.h"
+
+#include "PostProcessing/LimitBoneWeightsProcess.h"
+#include <assimp/scene.h>
+
+using namespace std;
+using namespace Assimp;
+
+class LimitBoneWeightsTest : public ::testing::Test {
+public:
+    LimitBoneWeightsTest() :
+            Test(), mProcess(nullptr), mMesh(nullptr) {
+        // empty
+    }
+
+protected:
+    virtual void SetUp();
+    virtual void TearDown();
+
+protected:
+    LimitBoneWeightsProcess *mProcess;
+    aiMesh *mMesh;
+};
+
+// ------------------------------------------------------------------------------------------------
+void LimitBoneWeightsTest::SetUp() {
+    // construct the process
+    this->mProcess = new LimitBoneWeightsProcess();
+
+    // now need to create a nice mesh for testing purposes
+    this->mMesh = new aiMesh();
+
+    mMesh->mNumVertices = 500;
+    mMesh->mVertices = new aiVector3D[500]; // uninit.
+    mMesh->mNumBones = 30;
+    mMesh->mBones = new aiBone *[30];
+    unsigned int iCur = 0;
+    for (unsigned int i = 0; i < 30; ++i) {
+        aiBone *pc = mMesh->mBones[i] = new aiBone();
+        pc->mNumWeights = 250;
+        pc->mWeights = new aiVertexWeight[pc->mNumWeights];
+        for (unsigned int qq = 0; qq < pc->mNumWeights; ++qq) {
+            aiVertexWeight &v = pc->mWeights[qq];
+            v.mVertexId = iCur++;
+            if (500 == iCur) {
+                iCur = 0;
+            }
+            v.mWeight = 1.0f / 15; // each vertex should occur once in two bones
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void LimitBoneWeightsTest::TearDown() {
+    delete mMesh;
+    delete mProcess;
+}
+
+// ------------------------------------------------------------------------------------------------
+TEST_F(LimitBoneWeightsTest, testProcess) {
+    // execute the step on the given data
+    mProcess->ProcessMesh(mMesh);
+
+    // check whether everything is ok ...
+    typedef std::vector<LimitBoneWeightsProcess::Weight> VertexWeightList;
+    VertexWeightList *asWeights = new VertexWeightList[mMesh->mNumVertices];
+
+    for (unsigned int i = 0; i < mMesh->mNumVertices; ++i) {
+        asWeights[i].reserve(4);
+    }
+
+    // sort back as per-vertex lists
+    for (unsigned int i = 0; i < mMesh->mNumBones; ++i) {
+        aiBone &pcBone = **(mMesh->mBones + i);
+        for (unsigned int q = 0; q < pcBone.mNumWeights; ++q) {
+            aiVertexWeight weight = pcBone.mWeights[q];
+            asWeights[weight.mVertexId].emplace_back(i, weight.mWeight);
+        }
+    }
+
+    // now validate the size of the lists and check whether all weights sum to 1.0f
+    for (unsigned int i = 0; i < mMesh->mNumVertices; ++i) {
+        EXPECT_LE(asWeights[i].size(), 4U);
+        float fSum = 0.0f;
+        for (VertexWeightList::const_iterator iter = asWeights[i].begin(); iter != asWeights[i].end(); ++iter) {
+            fSum += (*iter).mWeight;
+        }
+        EXPECT_GE(fSum, 0.95F);
+        EXPECT_LE(fSum, 1.04F);
+    }
+
+    // delete allocated storage
+    delete[] asWeights;
+
+    // everything seems to be OK
+}

vendor/assimp/test/unit/utM3DImportExport.cpp

@@ -0,0 +1,84 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, assimp tea
+
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+
+#include <assimp/Importer.hpp>
+#include <assimp/Exporter.hpp>
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utM3DImportExport : public AbstractImportExportBase {
+public:
+	bool importerTest() override  {
+        Assimp::Importer importer;
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/M3D/cube_normals.m3d", aiProcess_ValidateDataStructure);
+#ifndef ASSIMP_BUILD_NO_M3D_IMPORTER
+		return nullptr != scene;
+#else
+        return nullptr == scene;
+#endif // ASSIMP_BUILD_NO_M3D_IMPORTER
+    }
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+    bool exporterTest() override {
+		Assimp::Importer importer;
+		const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/M3D/cube_normals.m3d", aiProcess_ValidateDataStructure);
+		Exporter exporter;
+		aiReturn ret = exporter.Export(scene, "m3d", ASSIMP_TEST_MODELS_DIR "/M3D/cube_normals_out.m3d");
+		return ret == AI_SUCCESS;
+    }
+#endif
+};
+
+TEST_F(utM3DImportExport, importM3DFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}
+
+#ifndef ASSIMP_BUILD_NO_EXPORT
+TEST_F(utM3DImportExport, exportM3DFromFileTest) {
+	EXPECT_TRUE(exporterTest());
+}
+#endif //  ASSIMP_BUILD_NO_EXPORT

vendor/assimp/test/unit/utMDCImportExport.cpp

@@ -0,0 +1,62 @@
+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+copyright notice, this list of conditions and the
+following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the
+following disclaimer in the documentation and/or other
+materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+contributors may be used to endorse or promote products
+derived from this software without specific prior
+written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#include "AbstractImportExportBase.h"
+#include "UnitTestPCH.h"
+#include <assimp/postprocess.h>
+#include <assimp/Importer.hpp>
+
+using namespace Assimp;
+
+class utMDCImportExport : public AbstractImportExportBase {
+public:
+    virtual bool importerTest() {
+        Assimp::Importer importer;
+
+        //const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MDC/spider.mdc", 0);
+        static_cast<void>(importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/MDC/spider.mdc", 0));
+        return true;
+    }
+};
+
+TEST_F(utMDCImportExport, importMDCFromFileTest) {
+    EXPECT_TRUE(importerTest());
+}