new stuff

assimp/tools/assimp_view/Normals.cpp

@@ -0,0 +1,155 @@
+/*
+---------------------------------------------------------------------------
+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 "assimp_view.h"
+
+#include "PostProcessing/CalcTangentsProcess.h"
+#include "PostProcessing/GenFaceNormalsProcess.h"
+#include "PostProcessing/GenVertexNormalsProcess.h"
+#include "PostProcessing/JoinVerticesProcess.h"
+#include "PostProcessing/MakeVerboseFormat.h"
+
+namespace AssimpView {
+
+using namespace Assimp;
+
+bool g_bWasFlipped = false;
+float g_smoothAngle = 80.f;
+
+//-------------------------------------------------------------------------------
+// Flip all normal vectors
+//-------------------------------------------------------------------------------
+void AssetHelper::FlipNormalsInt() {
+    // invert all normal vectors
+    for (unsigned int i = 0; i < this->pcScene->mNumMeshes; ++i) {
+        aiMesh *pcMesh = this->pcScene->mMeshes[i];
+
+        if (!pcMesh->mNormals) {
+            continue;
+        }
+
+        for (unsigned int a = 0; a < pcMesh->mNumVertices; ++a) {
+            pcMesh->mNormals[a] *= -1.0f;
+        }
+    }
+}
+
+//-------------------------------------------------------------------------------
+void AssetHelper::FlipNormals() {
+    FlipNormalsInt();
+
+    // recreate native data
+    DeleteAssetData(true);
+    CreateAssetData();
+    g_bWasFlipped = !g_bWasFlipped;
+}
+
+//-------------------------------------------------------------------------------
+// Set the normal set of the scene
+//-------------------------------------------------------------------------------
+void AssetHelper::SetNormalSet(unsigned int iSet) {
+    // we need to build an unique set of vertices for this ...
+    {
+        MakeVerboseFormatProcess *pcProcess = new MakeVerboseFormatProcess();
+        pcProcess->Execute(pcScene);
+        delete pcProcess;
+
+        for (unsigned int i = 0; i < pcScene->mNumMeshes; ++i) {
+            if (!apcMeshes[i]->pvOriginalNormals) {
+                apcMeshes[i]->pvOriginalNormals = new aiVector3D[pcScene->mMeshes[i]->mNumVertices];
+                memcpy(apcMeshes[i]->pvOriginalNormals, pcScene->mMeshes[i]->mNormals,
+                        pcScene->mMeshes[i]->mNumVertices * sizeof(aiVector3D));
+            }
+            delete[] pcScene->mMeshes[i]->mNormals;
+            pcScene->mMeshes[i]->mNormals = nullptr;
+        }
+    }
+
+    // now we can start to calculate a new set of normals
+    if (HARD == iSet) {
+        GenFaceNormalsProcess *pcProcess = new GenFaceNormalsProcess();
+        pcProcess->Execute(pcScene);
+        FlipNormalsInt();
+        delete pcProcess;
+    } else if (SMOOTH == iSet) {
+        GenVertexNormalsProcess *pcProcess = new GenVertexNormalsProcess();
+        pcProcess->SetMaxSmoothAngle((float)AI_DEG_TO_RAD(g_smoothAngle));
+        pcProcess->Execute(pcScene);
+        FlipNormalsInt();
+        delete pcProcess;
+    } else if (ORIGINAL == iSet) {
+        for (unsigned int i = 0; i < pcScene->mNumMeshes; ++i) {
+            if (apcMeshes[i]->pvOriginalNormals) {
+                delete[] pcScene->mMeshes[i]->mNormals;
+                pcScene->mMeshes[i]->mNormals = apcMeshes[i]->pvOriginalNormals;
+                apcMeshes[i]->pvOriginalNormals = nullptr;
+            }
+        }
+    }
+
+    // recalculate tangents and bitangents
+    Assimp::BaseProcess *pcProcess = new CalcTangentsProcess();
+    pcProcess->Execute(pcScene);
+    delete pcProcess;
+
+    // join the mesh vertices again
+    pcProcess = new JoinVerticesProcess();
+    pcProcess->Execute(pcScene);
+    delete pcProcess;
+
+    iNormalSet = iSet;
+
+    if (g_bWasFlipped) {
+        // invert all normal vectors
+        for (unsigned int i = 0; i < pcScene->mNumMeshes; ++i) {
+            aiMesh *pcMesh = pcScene->mMeshes[i];
+            for (unsigned int a = 0; a < pcMesh->mNumVertices; ++a) {
+                pcMesh->mNormals[a] *= -1.0f;
+            }
+        }
+    }
+
+    // recreate native data
+    DeleteAssetData(true);
+    CreateAssetData();
+}
+
+} // namespace AssimpView