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Tarion 2026-07-03 03:41:25 +02:00
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/*
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 glTFWriter.h
* Declares a class to write gltf/glb files
*
* glTF Extensions Support:
* KHR_binary_glTF: full
* KHR_materials_common: full
*/
#ifndef GLTFASSETWRITER_H_INC
#define GLTFASSETWRITER_H_INC
//#if !defined(ASSIMP_BUILD_NO_GLTF_IMPORTER) && !defined(ASSIMP_BUILD_NO_GLTF1_IMPORTER)
#include "glTFAsset.h"
namespace glTF
{
using rapidjson::MemoryPoolAllocator;
class AssetWriter
{
template<class T>
friend void WriteLazyDict(LazyDict<T>& d, AssetWriter& w);
public:
Document mDoc;
Asset& mAsset;
MemoryPoolAllocator<>& mAl;
AssetWriter(Asset& asset);
~AssetWriter() = default;
void WriteFile(const char* path);
void WriteGLBFile(const char* path);
private:
void WriteBinaryData(IOStream* outfile, size_t sceneLength);
void WriteMetadata();
void WriteExtensionsUsed();
template<class T>
void WriteObjects(LazyDict<T>& d);
};
}
// Include the implementation of the methods
#include "glTFAssetWriter.inl"
//#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER
#endif // GLTFASSETWRITER_H_INC

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/*
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/Base64.hpp>
#include <rapidjson/stringbuffer.h>
#include <rapidjson/writer.h>
#include <rapidjson/prettywriter.h>
#if _MSC_VER
# pragma warning(push)
# pragma warning( disable : 4706)
#endif // _MSC_VER
namespace glTF {
using rapidjson::StringBuffer;
using rapidjson::PrettyWriter;
using rapidjson::Writer;
using rapidjson::StringRef;
using rapidjson::StringRef;
namespace {
template<typename T, size_t N>
inline
Value& MakeValue(Value& val, T(&r)[N], MemoryPoolAllocator<>& al) {
val.SetArray();
val.Reserve(N, al);
for (decltype(N) i = 0; i < N; ++i) {
val.PushBack(r[i], al);
}
return val;
}
template<typename T>
inline
Value& MakeValue(Value& val, const std::vector<T> & r, MemoryPoolAllocator<>& al) {
val.SetArray();
val.Reserve(static_cast<rapidjson::SizeType>(r.size()), al);
for (unsigned int i = 0; i < r.size(); ++i) {
val.PushBack(r[i], al);
}
return val;
}
template<typename C, typename T>
inline Value& MakeValueCast(Value& val, const std::vector<T> & r, MemoryPoolAllocator<>& al) {
val.SetArray();
val.Reserve(static_cast<rapidjson::SizeType>(r.size()), al);
for (unsigned int i = 0; i < r.size(); ++i) {
val.PushBack(static_cast<C>(r[i]), al);
}
return val;
}
template<class T>
inline void AddRefsVector(Value& obj, const char* fieldId, std::vector< Ref<T> >& v, MemoryPoolAllocator<>& al) {
if (v.empty()) return;
Value lst;
lst.SetArray();
lst.Reserve(unsigned(v.size()), al);
for (size_t i = 0; i < v.size(); ++i) {
lst.PushBack(StringRef(v[i]->id), al);
}
obj.AddMember(StringRef(fieldId), lst, al);
}
}
inline void Write(Value& obj, Accessor& a, AssetWriter& w)
{
obj.AddMember("bufferView", Value(a.bufferView->id, w.mAl).Move(), w.mAl);
obj.AddMember("byteOffset", a.byteOffset, w.mAl);
obj.AddMember("byteStride", a.byteStride, w.mAl);
obj.AddMember("componentType", int(a.componentType), w.mAl);
obj.AddMember("count", a.count, w.mAl);
obj.AddMember("type", StringRef(AttribType::ToString(a.type)), w.mAl);
Value vTmpMax, vTmpMin;
if (a.componentType == ComponentType_FLOAT) {
obj.AddMember("max", MakeValue(vTmpMax, a.max, w.mAl), w.mAl);
obj.AddMember("min", MakeValue(vTmpMin, a.min, w.mAl), w.mAl);
} else {
obj.AddMember("max", MakeValueCast<int64_t>(vTmpMax, a.max, w.mAl), w.mAl);
obj.AddMember("min", MakeValueCast<int64_t>(vTmpMin, a.min, w.mAl), w.mAl);
}
}
inline void Write(Value& obj, Animation& a, AssetWriter& w)
{
/****************** Channels *******************/
Value channels;
channels.SetArray();
channels.Reserve(unsigned(a.Channels.size()), w.mAl);
for (size_t i = 0; i < unsigned(a.Channels.size()); ++i) {
Animation::AnimChannel& c = a.Channels[i];
Value valChannel;
valChannel.SetObject();
{
valChannel.AddMember("sampler", c.sampler, w.mAl);
Value valTarget;
valTarget.SetObject();
{
valTarget.AddMember("id", StringRef(c.target.id->id), w.mAl);
valTarget.AddMember("path", c.target.path, w.mAl);
}
valChannel.AddMember("target", valTarget, w.mAl);
}
channels.PushBack(valChannel, w.mAl);
}
obj.AddMember("channels", channels, w.mAl);
/****************** Parameters *******************/
Value valParameters;
valParameters.SetObject();
{
if (a.Parameters.TIME) {
valParameters.AddMember("TIME", StringRef(a.Parameters.TIME->id), w.mAl);
}
if (a.Parameters.rotation) {
valParameters.AddMember("rotation", StringRef(a.Parameters.rotation->id), w.mAl);
}
if (a.Parameters.scale) {
valParameters.AddMember("scale", StringRef(a.Parameters.scale->id), w.mAl);
}
if (a.Parameters.translation) {
valParameters.AddMember("translation", StringRef(a.Parameters.translation->id), w.mAl);
}
}
obj.AddMember("parameters", valParameters, w.mAl);
/****************** Samplers *******************/
Value valSamplers;
valSamplers.SetObject();
for (size_t i = 0; i < unsigned(a.Samplers.size()); ++i) {
Animation::AnimSampler& s = a.Samplers[i];
Value valSampler;
valSampler.SetObject();
{
valSampler.AddMember("input", s.input, w.mAl);
valSampler.AddMember("interpolation", s.interpolation, w.mAl);
valSampler.AddMember("output", s.output, w.mAl);
}
valSamplers.AddMember(StringRef(s.id), valSampler, w.mAl);
}
obj.AddMember("samplers", valSamplers, w.mAl);
}
inline void Write(Value& obj, Buffer& b, AssetWriter& w)
{
const char* type;
switch (b.type) {
case Buffer::Type_text:
type = "text"; break;
default:
type = "arraybuffer";
}
obj.AddMember("byteLength", static_cast<uint64_t>(b.byteLength), w.mAl);
obj.AddMember("type", StringRef(type), w.mAl);
obj.AddMember("uri", Value(b.GetURI(), w.mAl).Move(), w.mAl);
}
inline void Write(Value& obj, BufferView& bv, AssetWriter& w)
{
obj.AddMember("buffer", Value(bv.buffer->id, w.mAl).Move(), w.mAl);
obj.AddMember("byteOffset", static_cast<uint64_t>(bv.byteOffset), w.mAl);
obj.AddMember("byteLength", static_cast<uint64_t>(bv.byteLength), w.mAl);
if (bv.target != BufferViewTarget_NONE) {
obj.AddMember("target", int(bv.target), w.mAl);
}
}
inline void Write(Value& /*obj*/, Camera& /*c*/, AssetWriter& /*w*/)
{
}
inline void Write(Value& obj, Image& img, AssetWriter& w)
{
std::string uri;
if (w.mAsset.extensionsUsed.KHR_binary_glTF && img.bufferView) {
Value exts, ext;
exts.SetObject();
ext.SetObject();
ext.AddMember("bufferView", StringRef(img.bufferView->id), w.mAl);
if (!img.mimeType.empty())
ext.AddMember("mimeType", StringRef(img.mimeType), w.mAl);
exts.AddMember("KHR_binary_glTF", ext, w.mAl);
obj.AddMember("extensions", exts, w.mAl);
return;
}
else if (img.HasData()) {
uri = "data:" + (img.mimeType.empty() ? "application/octet-stream" : img.mimeType);
uri += ";base64,";
Base64::Encode(img.GetData(), img.GetDataLength(), uri);
}
else {
uri = img.uri;
}
obj.AddMember("uri", Value(uri, w.mAl).Move(), w.mAl);
}
namespace {
inline void WriteColorOrTex(Value& obj, TexProperty& prop, const char* propName, MemoryPoolAllocator<>& al)
{
if (prop.texture)
obj.AddMember(StringRef(propName), Value(prop.texture->id, al).Move(), al);
else {
Value col;
obj.AddMember(StringRef(propName), MakeValue(col, prop.color, al), al);
}
}
}
inline void Write(Value& obj, Material& m, AssetWriter& w)
{
Value v;
v.SetObject();
{
WriteColorOrTex(v, m.ambient, "ambient", w.mAl);
WriteColorOrTex(v, m.diffuse, "diffuse", w.mAl);
WriteColorOrTex(v, m.specular, "specular", w.mAl);
WriteColorOrTex(v, m.emission, "emission", w.mAl);
if (m.transparent)
v.AddMember("transparency", m.transparency, w.mAl);
v.AddMember("shininess", m.shininess, w.mAl);
}
obj.AddMember("values", v, w.mAl);
}
namespace {
inline void WriteAttrs(AssetWriter& w, Value& attrs, Mesh::AccessorList& lst,
const char* semantic, bool forceNumber = false)
{
if (lst.empty()) return;
if (lst.size() == 1 && !forceNumber) {
attrs.AddMember(StringRef(semantic), Value(lst[0]->id, w.mAl).Move(), w.mAl);
}
else {
for (size_t i = 0; i < lst.size(); ++i) {
char buffer[32];
ai_snprintf(buffer, 32, "%s_%d", semantic, int(i));
attrs.AddMember(Value(buffer, w.mAl).Move(), Value(lst[i]->id, w.mAl).Move(), w.mAl);
}
}
}
}
inline void Write(Value& obj, Mesh& m, AssetWriter& w)
{
/********************* Name **********************/
obj.AddMember("name", m.name, w.mAl);
/**************** Mesh extensions ****************/
if(m.Extension.size() > 0)
{
Value json_extensions;
json_extensions.SetObject();
#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
for(Mesh::SExtension* ptr_ext : m.Extension)
{
switch(ptr_ext->Type)
{
case Mesh::SExtension::EType::Compression_Open3DGC:
{
Value json_comp_data;
Mesh::SCompression_Open3DGC* ptr_ext_comp = (Mesh::SCompression_Open3DGC*)ptr_ext;
// filling object "compressedData"
json_comp_data.SetObject();
json_comp_data.AddMember("buffer", ptr_ext_comp->Buffer, w.mAl);
json_comp_data.AddMember("byteOffset", static_cast<uint64_t>(ptr_ext_comp->Offset), w.mAl);
json_comp_data.AddMember("componentType", 5121, w.mAl);
json_comp_data.AddMember("type", "SCALAR", w.mAl);
json_comp_data.AddMember("count", static_cast<uint64_t>(ptr_ext_comp->Count), w.mAl);
if(ptr_ext_comp->Binary)
json_comp_data.AddMember("mode", "binary", w.mAl);
else
json_comp_data.AddMember("mode", "ascii", w.mAl);
json_comp_data.AddMember("indicesCount", static_cast<uint64_t>(ptr_ext_comp->IndicesCount), w.mAl);
json_comp_data.AddMember("verticesCount", static_cast<uint64_t>(ptr_ext_comp->VerticesCount), w.mAl);
// filling object "Open3DGC-compression"
Value json_o3dgc;
json_o3dgc.SetObject();
json_o3dgc.AddMember("compressedData", json_comp_data, w.mAl);
// add member to object "extensions"
json_extensions.AddMember("Open3DGC-compression", json_o3dgc, w.mAl);
}
break;
default:
throw DeadlyImportError("GLTF: Can not write mesh: unknown mesh extension, only Open3DGC is supported.");
}// switch(ptr_ext->Type)
}// for(Mesh::SExtension* ptr_ext : m.Extension)
#endif
// Add extensions to mesh
obj.AddMember("extensions", json_extensions, w.mAl);
}// if(m.Extension.size() > 0)
/****************** Primitives *******************/
Value primitives;
primitives.SetArray();
primitives.Reserve(unsigned(m.primitives.size()), w.mAl);
for (size_t i = 0; i < m.primitives.size(); ++i) {
Mesh::Primitive& p = m.primitives[i];
Value prim;
prim.SetObject();
{
prim.AddMember("mode", Value(int(p.mode)).Move(), w.mAl);
if (p.material)
prim.AddMember("material", p.material->id, w.mAl);
if (p.indices)
prim.AddMember("indices", Value(p.indices->id, w.mAl).Move(), w.mAl);
Value attrs;
attrs.SetObject();
{
WriteAttrs(w, attrs, p.attributes.position, "POSITION");
WriteAttrs(w, attrs, p.attributes.normal, "NORMAL");
WriteAttrs(w, attrs, p.attributes.texcoord, "TEXCOORD", true);
WriteAttrs(w, attrs, p.attributes.color, "COLOR");
WriteAttrs(w, attrs, p.attributes.joint, "JOINT");
WriteAttrs(w, attrs, p.attributes.jointmatrix, "JOINTMATRIX");
WriteAttrs(w, attrs, p.attributes.weight, "WEIGHT");
}
prim.AddMember("attributes", attrs, w.mAl);
}
primitives.PushBack(prim, w.mAl);
}
obj.AddMember("primitives", primitives, w.mAl);
}
inline void Write(Value& obj, Node& n, AssetWriter& w)
{
if (n.matrix.isPresent) {
Value val;
obj.AddMember("matrix", MakeValue(val, n.matrix.value, w.mAl).Move(), w.mAl);
}
if (n.translation.isPresent) {
Value val;
obj.AddMember("translation", MakeValue(val, n.translation.value, w.mAl).Move(), w.mAl);
}
if (n.scale.isPresent) {
Value val;
obj.AddMember("scale", MakeValue(val, n.scale.value, w.mAl).Move(), w.mAl);
}
if (n.rotation.isPresent) {
Value val;
obj.AddMember("rotation", MakeValue(val, n.rotation.value, w.mAl).Move(), w.mAl);
}
AddRefsVector(obj, "children", n.children, w.mAl);
AddRefsVector(obj, "meshes", n.meshes, w.mAl);
AddRefsVector(obj, "skeletons", n.skeletons, w.mAl);
if (n.skin) {
obj.AddMember("skin", Value(n.skin->id, w.mAl).Move(), w.mAl);
}
if (!n.jointName.empty()) {
obj.AddMember("jointName", n.jointName, w.mAl);
}
}
inline void Write(Value& /*obj*/, Program& /*b*/, AssetWriter& /*w*/)
{
}
inline void Write(Value& obj, Sampler& b, AssetWriter& w)
{
if (b.wrapS) {
obj.AddMember("wrapS", b.wrapS, w.mAl);
}
if (b.wrapT) {
obj.AddMember("wrapT", b.wrapT, w.mAl);
}
if (b.magFilter) {
obj.AddMember("magFilter", b.magFilter, w.mAl);
}
if (b.minFilter) {
obj.AddMember("minFilter", b.minFilter, w.mAl);
}
}
inline void Write(Value& scene, Scene& s, AssetWriter& w)
{
AddRefsVector(scene, "nodes", s.nodes, w.mAl);
}
inline void Write(Value& /*obj*/, Shader& /*b*/, AssetWriter& /*w*/)
{
}
inline void Write(Value& obj, Skin& b, AssetWriter& w)
{
/****************** jointNames *******************/
Value vJointNames;
vJointNames.SetArray();
vJointNames.Reserve(unsigned(b.jointNames.size()), w.mAl);
for (size_t i = 0; i < unsigned(b.jointNames.size()); ++i) {
vJointNames.PushBack(StringRef(b.jointNames[i]->jointName), w.mAl);
}
obj.AddMember("jointNames", vJointNames, w.mAl);
if (b.bindShapeMatrix.isPresent) {
Value val;
obj.AddMember("bindShapeMatrix", MakeValue(val, b.bindShapeMatrix.value, w.mAl).Move(), w.mAl);
}
if (b.inverseBindMatrices) {
obj.AddMember("inverseBindMatrices", Value(b.inverseBindMatrices->id, w.mAl).Move(), w.mAl);
}
}
inline void Write(Value& /*obj*/, Technique& /*b*/, AssetWriter& /*w*/)
{
}
inline void Write(Value& obj, Texture& tex, AssetWriter& w)
{
if (tex.source) {
obj.AddMember("source", Value(tex.source->id, w.mAl).Move(), w.mAl);
}
if (tex.sampler) {
obj.AddMember("sampler", Value(tex.sampler->id, w.mAl).Move(), w.mAl);
}
}
inline void Write(Value& /*obj*/, Light& /*b*/, AssetWriter& /*w*/)
{
}
inline AssetWriter::AssetWriter(Asset& a)
: mDoc()
, mAsset(a)
, mAl(mDoc.GetAllocator())
{
mDoc.SetObject();
WriteMetadata();
WriteExtensionsUsed();
// Dump the contents of the dictionaries
for (size_t i = 0; i < a.mDicts.size(); ++i) {
a.mDicts[i]->WriteObjects(*this);
}
// Add the target scene field
if (mAsset.scene) {
mDoc.AddMember("scene", StringRef(mAsset.scene->id), mAl);
}
}
inline void AssetWriter::WriteFile(const char* path)
{
std::unique_ptr<IOStream> jsonOutFile(mAsset.OpenFile(path, "wt", true));
if (jsonOutFile == nullptr) {
throw DeadlyExportError("Could not open output file: " + std::string(path));
}
StringBuffer docBuffer;
PrettyWriter<StringBuffer> writer(docBuffer);
if (!mDoc.Accept(writer)) {
throw DeadlyExportError("Failed to write scene data!");
}
if (jsonOutFile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
throw DeadlyExportError("Failed to write scene data!");
}
// Write buffer data to separate .bin files
for (unsigned int i = 0; i < mAsset.buffers.Size(); ++i) {
Ref<Buffer> b = mAsset.buffers.Get(i);
std::string binPath = b->GetURI();
std::unique_ptr<IOStream> binOutFile(mAsset.OpenFile(binPath, "wb", true));
if (binOutFile == nullptr) {
throw DeadlyExportError("Could not open output file: " + binPath);
}
if (b->byteLength > 0) {
if (binOutFile->Write(b->GetPointer(), b->byteLength, 1) != 1) {
throw DeadlyExportError("Failed to write binary file: " + binPath);
}
}
}
}
inline void AssetWriter::WriteGLBFile(const char* path)
{
std::unique_ptr<IOStream> outfile(mAsset.OpenFile(path, "wb", true));
if (outfile == nullptr) {
throw DeadlyExportError("Could not open output file: " + std::string(path));
}
// we will write the header later, skip its size
outfile->Seek(sizeof(GLB_Header), aiOrigin_SET);
StringBuffer docBuffer;
Writer<StringBuffer> writer(docBuffer);
if (!mDoc.Accept(writer)) {
throw DeadlyExportError("Failed to write scene data!");
}
if (outfile->Write(docBuffer.GetString(), docBuffer.GetSize(), 1) != 1) {
throw DeadlyExportError("Failed to write scene data!");
}
WriteBinaryData(outfile.get(), docBuffer.GetSize());
}
inline void AssetWriter::WriteBinaryData(IOStream* outfile, size_t sceneLength)
{
//
// write the body data
//
size_t bodyLength = 0;
if (Ref<Buffer> b = mAsset.GetBodyBuffer()) {
bodyLength = b->byteLength;
if (bodyLength > 0) {
size_t bodyOffset = sizeof(GLB_Header) + sceneLength;
bodyOffset = (bodyOffset + 3) & ~3; // Round up to next multiple of 4
outfile->Seek(bodyOffset, aiOrigin_SET);
if (outfile->Write(b->GetPointer(), b->byteLength, 1) != 1) {
throw DeadlyExportError("Failed to write body data!");
}
}
}
//
// write the header
//
GLB_Header header;
memcpy(header.magic, AI_GLB_MAGIC_NUMBER, sizeof(header.magic));
header.version = 1;
AI_SWAP4(header.version);
header.length = uint32_t(sizeof(header) + sceneLength + bodyLength);
AI_SWAP4(header.length);
header.sceneLength = uint32_t(sceneLength);
AI_SWAP4(header.sceneLength);
header.sceneFormat = SceneFormat_JSON;
AI_SWAP4(header.sceneFormat);
outfile->Seek(0, aiOrigin_SET);
if (outfile->Write(&header, 1, sizeof(header)) != sizeof(header)) {
throw DeadlyExportError("Failed to write the header!");
}
}
inline void AssetWriter::WriteMetadata()
{
Value asset;
asset.SetObject();
asset.AddMember("version", Value(mAsset.asset.version, mAl).Move(), mAl);
asset.AddMember("generator", Value(mAsset.asset.generator, mAl).Move(), mAl);
if (!mAsset.asset.copyright.empty())
asset.AddMember("copyright", Value(mAsset.asset.copyright, mAl).Move(), mAl);
mDoc.AddMember("asset", asset, mAl);
}
inline void AssetWriter::WriteExtensionsUsed()
{
Value exts;
exts.SetArray();
{
if (false)
exts.PushBack(StringRef("KHR_binary_glTF"), mAl);
if (false)
exts.PushBack(StringRef("KHR_materials_common"), mAl);
}
if (!exts.Empty())
mDoc.AddMember("extensionsUsed", exts, mAl);
}
template<class T>
void AssetWriter::WriteObjects(LazyDict<T>& d)
{
if (d.mObjs.empty()) return;
Value* container = &mDoc;
if (d.mExtId) {
Value* exts = FindObject(mDoc, "extensions");
if (!exts) {
mDoc.AddMember("extensions", Value().SetObject().Move(), mDoc.GetAllocator());
exts = FindObject(mDoc, "extensions");
}
if (!(container = FindObject(*exts, d.mExtId))) {
exts->AddMember(StringRef(d.mExtId), Value().SetObject().Move(), mDoc.GetAllocator());
container = FindObject(*exts, d.mExtId);
}
}
Value* dict;
if (!(dict = FindObject(*container, d.mDictId))) {
container->AddMember(StringRef(d.mDictId), Value().SetObject().Move(), mDoc.GetAllocator());
dict = FindObject(*container, d.mDictId);
}
for (size_t i = 0; i < d.mObjs.size(); ++i) {
if (d.mObjs[i]->IsSpecial()) continue;
Value obj;
obj.SetObject();
if (!d.mObjs[i]->name.empty()) {
obj.AddMember("name", StringRef(d.mObjs[i]->name.c_str()), mAl);
}
Write(obj, *d.mObjs[i], *this);
dict->AddMember(StringRef(d.mObjs[i]->id), obj, mAl);
}
}
template<class T>
void WriteLazyDict(LazyDict<T>& d, AssetWriter& w)
{
w.WriteObjects(d);
}
#if _MSC_VER
# pragma warning(pop)
#endif // _WIN32
}

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/*
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 GltfExporter.h
* Declares the exporter class to write a scene to a gltf/glb file
*/
#pragma once
#ifndef AI_GLTFEXPORTER_H_INC
#define AI_GLTFEXPORTER_H_INC
#if !defined(ASSIMP_BUILD_NO_GLTF_EXPORTER) && !defined(ASSIMP_BUILD_NO_GLTF1_EXPORTER)
#include <assimp/material.h>
#include <assimp/defs.h>
#include <map>
#include <memory>
#include <sstream>
#include <vector>
struct aiScene;
struct aiNode;
namespace glTFCommon {
template <class T>
class Ref;
}
namespace glTF {
class Asset;
struct TexProperty;
struct Node;
} // namespace glTF
namespace Assimp {
class IOSystem;
class IOStream;
class ExportProperties;
// ------------------------------------------------------------------------------------------------
/** Helper class to export a given scene to an glTF file. */
// ------------------------------------------------------------------------------------------------
class glTFExporter {
public:
/// Constructor for a specific scene to export
glTFExporter(const char *filename, IOSystem *pIOSystem, const aiScene *pScene,
const ExportProperties *pProperties, bool binary);
private:
const char *mFilename;
IOSystem *mIOSystem;
std::shared_ptr<const aiScene> mScene;
const ExportProperties *mProperties;
std::map<std::string, unsigned int> mTexturesByPath;
std::shared_ptr<glTF::Asset> mAsset;
std::vector<unsigned char> mBodyData;
ai_real configEpsilon;
void WriteBinaryData(IOStream *outfile, std::size_t sceneLength);
void GetTexSampler(const aiMaterial *mat, glTF::TexProperty &prop);
void GetMatColorOrTex(const aiMaterial *mat, glTF::TexProperty &prop, const char *propName, int type, int idx, aiTextureType tt);
void ExportMetadata();
void ExportMaterials();
void ExportMeshes();
unsigned int ExportNodeHierarchy(const aiNode *n);
unsigned int ExportNode(const aiNode *node, glTFCommon::Ref<glTF::Node> & parent);
void ExportScene();
void ExportAnimations();
};
} // namespace Assimp
#endif // ASSIMP_BUILD_NO_GLTF_EXPORTER
#endif // AI_GLTFEXPORTER_H_INC

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/*
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.
----------------------------------------------------------------------
*/
#if !defined(ASSIMP_BUILD_NO_GLTF_IMPORTER) && !defined(ASSIMP_BUILD_NO_GLTF1_IMPORTER)
#include "glTFImporter.h"
#include "glTFAsset.h"
#if !defined(ASSIMP_BUILD_NO_EXPORT)
# include "glTFAssetWriter.h"
#endif
#include "PostProcessing/MakeVerboseFormat.h"
#include <assimp/StringComparison.h>
#include <assimp/StringUtils.h>
#include <assimp/ai_assert.h>
#include <assimp/commonMetaData.h>
#include <assimp/importerdesc.h>
#include <assimp/scene.h>
#include <assimp/DefaultLogger.hpp>
using namespace Assimp;
using namespace glTF;
static constexpr aiImporterDesc desc = {
"glTF Importer",
"",
"",
"",
aiImporterFlags_SupportTextFlavour |
aiImporterFlags_SupportBinaryFlavour |
aiImporterFlags_SupportCompressedFlavour |
aiImporterFlags_LimitedSupport |
aiImporterFlags_Experimental,
0,
0,
0,
0,
"gltf glb"
};
namespace {
void SetMaterialColorProperty(const std::vector<int> &embeddedTexIdxs, Asset &, TexProperty prop, aiMaterial *mat,
aiTextureType texType, const char *pKey, unsigned int type, unsigned int idx) {
if (prop.texture) {
if (prop.texture->source) {
aiString uri(prop.texture->source->uri);
if (const int texIdx = embeddedTexIdxs[prop.texture->source.GetIndex()]; texIdx != -1) { // embedded
// setup texture reference string (copied from ColladaLoader::FindFilenameForEffectTexture)
uri.data[0] = '*';
uri.length = 1 + ASSIMP_itoa10(uri.data + 1, AI_MAXLEN - 1, texIdx);
}
mat->AddProperty(&uri, _AI_MATKEY_TEXTURE_BASE, texType, 0);
}
return;
}
aiColor4D col;
CopyValue(prop.color, col);
mat->AddProperty(&col, 1, pKey, type, idx);
}
void SetFace(aiFace &face, int a) {
face.mNumIndices = 1;
face.mIndices = new unsigned int[1];
face.mIndices[0] = a;
}
void SetFace(aiFace &face, int a, int b) {
face.mNumIndices = 2;
face.mIndices = new unsigned int[2];
face.mIndices[0] = a;
face.mIndices[1] = b;
}
void SetFace(aiFace &face, int a, int b, int c) {
face.mNumIndices = 3;
face.mIndices = new unsigned int[3];
face.mIndices[0] = a;
face.mIndices[1] = b;
face.mIndices[2] = c;
}
bool CheckValidFacesIndices(const aiFace *faces, unsigned nFaces, unsigned nVerts) {
for (unsigned i = 0; i < nFaces; ++i) {
for (unsigned j = 0; j < faces[i].mNumIndices; ++j) {
unsigned idx = faces[i].mIndices[j];
if (idx >= nVerts)
return false;
}
}
return true;
}
void createDefaultMaterial(aiScene *scene) {
if (scene == nullptr) {
return;
}
scene->mNumMaterials = 1;
scene->mMaterials = nullptr;
scene->mMaterials = new aiMaterial *[1];
scene->mMaterials[0] = new aiMaterial();
}
} // Anonymous namespace
glTFImporter::glTFImporter() :
mScene(nullptr) {
// empty
}
const aiImporterDesc *glTFImporter::GetInfo() const {
return &desc;
}
bool glTFImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /* checkSig */) const {
Asset asset(pIOHandler);
try {
asset.Load(pFile,
CheckMagicToken(
pIOHandler, pFile, AI_GLB_MAGIC_NUMBER, 1, 0,
static_cast<unsigned int>(strlen(AI_GLB_MAGIC_NUMBER))));
return asset.asset;
} catch (...) {
return false;
}
}
void glTFImporter::ImportMaterials(Asset &r) const {
mScene->mNumMaterials = r.materials.Size();
if (mScene->mNumMaterials == 0) {
createDefaultMaterial(mScene);
return;
}
mScene->mMaterials = new aiMaterial *[mScene->mNumMaterials];
for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) {
aiMaterial *aimat = mScene->mMaterials[i] = new aiMaterial();
Material &mat = r.materials[i];
aiString str(mat.id);
aimat->AddProperty(&str, AI_MATKEY_NAME);
SetMaterialColorProperty(embeddedTexIdxs, r, mat.ambient, aimat, aiTextureType_AMBIENT, AI_MATKEY_COLOR_AMBIENT);
SetMaterialColorProperty(embeddedTexIdxs, r, mat.diffuse, aimat, aiTextureType_DIFFUSE, AI_MATKEY_COLOR_DIFFUSE);
SetMaterialColorProperty(embeddedTexIdxs, r, mat.specular, aimat, aiTextureType_SPECULAR, AI_MATKEY_COLOR_SPECULAR);
SetMaterialColorProperty(embeddedTexIdxs, r, mat.emission, aimat, aiTextureType_EMISSIVE, AI_MATKEY_COLOR_EMISSIVE);
aimat->AddProperty(&mat.doubleSided, 1, AI_MATKEY_TWOSIDED);
if (mat.transparent && (mat.transparency != 1.0f)) {
aimat->AddProperty(&mat.transparency, 1, AI_MATKEY_OPACITY);
}
if (mat.shininess > 0.f) {
aimat->AddProperty(&mat.shininess, 1, AI_MATKEY_SHININESS);
}
}
}
void glTFImporter::ImportMeshes(Asset &r) {
std::vector<aiMesh *> meshes;
unsigned int k = 0;
meshOffsets.clear();
for (unsigned int m = 0; m < r.meshes.Size(); ++m) {
Mesh &mesh = r.meshes[m];
// Check if mesh extensions is used
if (mesh.Extension.size() > 0) {
#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
for (Mesh::SExtension *cur_ext : mesh.Extension) {
if (cur_ext->Type == Mesh::SExtension::EType::Compression_Open3DGC) {
// Limitations for meshes when using Open3DGC-compression.
// It's a current limitation of sp... Specification have not this part still - about mesh compression. Why only one primitive?
// Because glTF is very flexibly. But in fact it ugly flexible. Every primitive can has own set of accessors and accessors can
// point to a-a-a-a-any part of buffer (through bufferview of course) and even to another buffer. We know that "Open3DGC-compression"
// is applicable only to part of buffer. As we can't guaranty continuity of the data for decoder, we will limit quantity of primitives.
// Yes indices, coordinates etc. still can br stored in different buffers, but with current specification it's a exporter problem.
// Also primitive can has only one of "POSITION", "NORMAL" and less then "AI_MAX_NUMBER_OF_TEXTURECOORDS" of "TEXCOORD". All accessor
// of primitive must point to one continuous region of the buffer.
if (mesh.primitives.size() > 2) throw DeadlyImportError("GLTF: When using Open3DGC compression then only one primitive per mesh are allowed.");
Mesh::SCompression_Open3DGC *o3dgc_ext = (Mesh::SCompression_Open3DGC *)cur_ext;
Ref<Buffer> buf = r.buffers.Get(o3dgc_ext->Buffer);
buf->EncodedRegion_SetCurrent(mesh.id);
} else
{
throw DeadlyImportError("GLTF: Can not import mesh: unknown mesh extension (code: \"", ai_to_string(cur_ext->Type),
"\"), only Open3DGC is supported.");
}
}
#endif
} // if(mesh.Extension.size() > 0)
meshOffsets.push_back(k);
k += static_cast<unsigned>(mesh.primitives.size());
for (unsigned int p = 0; p < mesh.primitives.size(); ++p) {
auto &[mode, attributes, indices, material] = mesh.primitives[p];
aiMesh *aim = new aiMesh();
meshes.push_back(aim);
aim->mName = mesh.id;
if (mesh.primitives.size() > 1) {
ai_uint32 &len = aim->mName.length;
aim->mName.data[len] = '-';
len += 1 + ASSIMP_itoa10(aim->mName.data + len + 1, unsigned(AI_MAXLEN - len - 1), p);
}
switch (mode) {
case PrimitiveMode_POINTS:
aim->mPrimitiveTypes |= aiPrimitiveType_POINT;
break;
case PrimitiveMode_LINES:
case PrimitiveMode_LINE_LOOP:
case PrimitiveMode_LINE_STRIP:
aim->mPrimitiveTypes |= aiPrimitiveType_LINE;
break;
case PrimitiveMode_TRIANGLES:
case PrimitiveMode_TRIANGLE_STRIP:
case PrimitiveMode_TRIANGLE_FAN:
aim->mPrimitiveTypes |= aiPrimitiveType_TRIANGLE;
break;
}
Mesh::Primitive::Attributes &attr = attributes;
if (attr.position.size() > 0 && attr.position[0]) {
aim->mNumVertices = attr.position[0]->count;
attr.position[0]->ExtractData(aim->mVertices);
}
if (attr.normal.size() > 0 && attr.normal[0]) attr.normal[0]->ExtractData(aim->mNormals);
for (size_t tc = 0; tc < attr.texcoord.size() && tc < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++tc) {
attr.texcoord[tc]->ExtractData(aim->mTextureCoords[tc]);
aim->mNumUVComponents[tc] = attr.texcoord[tc]->GetNumComponents();
aiVector3D *values = aim->mTextureCoords[tc];
for (unsigned int i = 0; i < aim->mNumVertices; ++i) {
values[i].y = 1 - values[i].y; // Flip Y coords
}
}
aiFace *faces = nullptr;
unsigned int nFaces = 0;
if (indices) {
unsigned int count = indices->count;
Accessor::Indexer data = indices->GetIndexer();
ai_assert(data.IsValid());
switch (mode) {
case PrimitiveMode_POINTS: {
nFaces = count;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; ++i) {
SetFace(faces[i], data.GetUInt(i));
}
break;
}
case PrimitiveMode_LINES: {
nFaces = count / 2;
if (nFaces * 2 != count) {
ASSIMP_LOG_WARN("The number of vertices was not compatible with the LINES mode. Some vertices were dropped.");
count = nFaces * 2;
}
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 2) {
SetFace(faces[i / 2], data.GetUInt(i), data.GetUInt(i + 1));
}
break;
}
case PrimitiveMode_LINE_LOOP:
case PrimitiveMode_LINE_STRIP: {
nFaces = count - ((mode == PrimitiveMode_LINE_STRIP) ? 1 : 0);
faces = new aiFace[nFaces];
SetFace(faces[0], data.GetUInt(0), data.GetUInt(1));
for (unsigned int i = 2; i < count; ++i) {
SetFace(faces[i - 1], faces[i - 2].mIndices[1], data.GetUInt(i));
}
if (mode == PrimitiveMode_LINE_LOOP) { // close the loop
SetFace(faces[count - 1], faces[count - 2].mIndices[1], faces[0].mIndices[0]);
}
break;
}
case PrimitiveMode_TRIANGLES: {
nFaces = count / 3;
if (nFaces * 3 != count) {
ASSIMP_LOG_WARN("The number of vertices was not compatible with the TRIANGLES mode. Some vertices were dropped.");
count = nFaces * 3;
}
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 3) {
SetFace(faces[i / 3], data.GetUInt(i), data.GetUInt(i + 1), data.GetUInt(i + 2));
}
break;
}
case PrimitiveMode_TRIANGLE_STRIP: {
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], data.GetUInt(0), data.GetUInt(1), data.GetUInt(2));
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[i - 1].mIndices[1], faces[i - 1].mIndices[2], data.GetUInt(i));
}
break;
}
case PrimitiveMode_TRIANGLE_FAN:
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], data.GetUInt(0), data.GetUInt(1), data.GetUInt(2));
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[0].mIndices[0], faces[i - 1].mIndices[2], data.GetUInt(i));
}
break;
}
} else { // no indices provided so directly generate from counts
// use the already determined count as it includes checks
unsigned int count = aim->mNumVertices;
switch (mode) {
case PrimitiveMode_POINTS: {
nFaces = count;
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; ++i) {
SetFace(faces[i], i);
}
break;
}
case PrimitiveMode_LINES: {
nFaces = count / 2;
if (nFaces * 2 != count) {
ASSIMP_LOG_WARN("The number of vertices was not compatible with the LINES mode. Some vertices were dropped.");
count = nFaces * 2;
}
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 2) {
SetFace(faces[i / 2], i, i + 1);
}
break;
}
case PrimitiveMode_LINE_LOOP:
case PrimitiveMode_LINE_STRIP: {
nFaces = count - ((mode == PrimitiveMode_LINE_STRIP) ? 1 : 0);
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1);
for (unsigned int i = 2; i < count; ++i) {
SetFace(faces[i - 1], faces[i - 2].mIndices[1], i);
}
if (mode == PrimitiveMode_LINE_LOOP) { // close the loop
SetFace(faces[count - 1], faces[count - 2].mIndices[1], faces[0].mIndices[0]);
}
break;
}
case PrimitiveMode_TRIANGLES: {
nFaces = count / 3;
if (nFaces * 3 != count) {
ASSIMP_LOG_WARN("The number of vertices was not compatible with the TRIANGLES mode. Some vertices were dropped.");
count = nFaces * 3;
}
faces = new aiFace[nFaces];
for (unsigned int i = 0; i < count; i += 3) {
SetFace(faces[i / 3], i, i + 1, i + 2);
}
break;
}
case PrimitiveMode_TRIANGLE_STRIP: {
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1, 2);
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[i - 1].mIndices[1], faces[i - 1].mIndices[2], i);
}
break;
}
case PrimitiveMode_TRIANGLE_FAN:
nFaces = count - 2;
faces = new aiFace[nFaces];
SetFace(faces[0], 0, 1, 2);
for (unsigned int i = 3; i < count; ++i) {
SetFace(faces[i - 2], faces[0].mIndices[0], faces[i - 1].mIndices[2], i);
}
break;
}
}
if (faces) {
aim->mFaces = faces;
aim->mNumFaces = nFaces;
const bool validRes = CheckValidFacesIndices(faces, nFaces, aim->mNumVertices);
if (!validRes) {
ai_assert(validRes);
ASSIMP_LOG_WARN("Invalid number of faces detected.");
}
}
if (material) {
aim->mMaterialIndex = material.GetIndex();
}
}
}
meshOffsets.push_back(k);
CopyVector(meshes, mScene->mMeshes, mScene->mNumMeshes);
}
void glTFImporter::ImportCameras(Asset &r) const {
if (!r.cameras.Size()) {
return;
}
mScene->mNumCameras = r.cameras.Size();
mScene->mCameras = new aiCamera *[r.cameras.Size()];
for (size_t i = 0; i < r.cameras.Size(); ++i) {
const Camera &cam = r.cameras[i];
mScene->mCameras[i] = new aiCamera();
const auto aiCameraPtr = mScene->mCameras[i];
if (cam.type == Camera::Perspective) {
aiCameraPtr->mAspect = cam.perspective.aspectRatio;
aiCameraPtr->mHorizontalFOV = cam.perspective.yfov * ((aiCameraPtr->mAspect == 0.f) ? 1.f : aiCameraPtr->mAspect);
aiCameraPtr->mClipPlaneFar = cam.perspective.zfar;
aiCameraPtr->mClipPlaneNear = cam.perspective.znear;
} else {
aiCameraPtr->mClipPlaneFar = cam.ortographic.zfar;
aiCameraPtr->mClipPlaneNear = cam.ortographic.znear;
aiCameraPtr->mHorizontalFOV = 0.0;
aiCameraPtr->mAspect = 1.0f;
if (0.f != cam.ortographic.ymag) {
aiCameraPtr->mAspect = cam.ortographic.xmag / cam.ortographic.ymag;
}
}
}
}
void glTFImporter::ImportLights(Asset &r) const {
if (!r.lights.Size()) {
return;
}
mScene->mNumLights = r.lights.Size();
mScene->mLights = new aiLight *[r.lights.Size()];
for (size_t i = 0; i < r.lights.Size(); ++i) {
Light &l = r.lights[i];
aiLight *ail = mScene->mLights[i] = new aiLight();
switch (l.type) {
case Light::Type_directional:
ail->mType = aiLightSource_DIRECTIONAL;
break;
case Light::Type_spot:
ail->mType = aiLightSource_SPOT;
break;
case Light::Type_ambient:
ail->mType = aiLightSource_AMBIENT;
break;
default: // Light::Type_point
ail->mType = aiLightSource_POINT;
break;
}
CopyValue(l.color, ail->mColorAmbient);
CopyValue(l.color, ail->mColorDiffuse);
CopyValue(l.color, ail->mColorSpecular);
ail->mAngleOuterCone = l.falloffAngle;
ail->mAngleInnerCone = l.falloffAngle * (1.0f - 1.0f / (1.0f + l.falloffExponent));
ail->mAttenuationConstant = l.constantAttenuation;
ail->mAttenuationLinear = l.linearAttenuation;
ail->mAttenuationQuadratic = l.quadraticAttenuation;
}
}
aiNode *ImportNode(aiScene *pScene, Asset &r, std::vector<unsigned int> &meshOffsets, Ref<Node> &ptr) {
Node &node = *ptr;
aiNode *ainode = new aiNode(node.id);
if (!node.children.empty()) {
ainode->mNumChildren = static_cast<unsigned>(node.children.size());
ainode->mChildren = new aiNode *[ainode->mNumChildren];
for (unsigned int i = 0; i < ainode->mNumChildren; ++i) {
aiNode *child = ImportNode(pScene, r, meshOffsets, node.children[i]);
child->mParent = ainode;
ainode->mChildren[i] = child;
}
}
aiMatrix4x4 &matrix = ainode->mTransformation;
if (node.matrix.isPresent) {
CopyValue(node.matrix.value, matrix);
} else {
if (node.translation.isPresent) {
aiVector3D trans;
CopyValue(node.translation.value, trans);
aiMatrix4x4 t;
aiMatrix4x4::Translation(trans, t);
matrix = t * matrix;
}
if (node.scale.isPresent) {
aiVector3D scal(1.f);
CopyValue(node.scale.value, scal);
aiMatrix4x4 s;
aiMatrix4x4::Scaling(scal, s);
matrix = s * matrix;
}
if (node.rotation.isPresent) {
aiQuaternion rot;
CopyValue(node.rotation.value, rot);
matrix = aiMatrix4x4(rot.GetMatrix()) * matrix;
}
}
if (!node.meshes.empty()) {
int count = 0;
for (size_t i = 0; i < node.meshes.size(); ++i) {
const int idx = node.meshes[i].GetIndex();
count += meshOffsets[idx + 1] - meshOffsets[idx];
}
ainode->mNumMeshes = count;
ainode->mMeshes = new unsigned int[count];
int k = 0;
for (size_t i = 0; i < node.meshes.size(); ++i) {
const int idx = node.meshes[i].GetIndex();
for (unsigned int j = meshOffsets[idx]; j < meshOffsets[idx + 1]; ++j, ++k) {
ainode->mMeshes[k] = j;
}
}
}
if (node.camera) {
pScene->mCameras[node.camera.GetIndex()]->mName = ainode->mName;
}
if (node.light) {
pScene->mLights[node.light.GetIndex()]->mName = ainode->mName;
}
return ainode;
}
void glTFImporter::ImportNodes(Asset &r) {
if (!r.scene) {
return;
}
std::vector<Ref<Node>> rootNodes = r.scene->nodes;
// The root nodes
if (auto numRootNodes = static_cast<unsigned>(rootNodes.size()); numRootNodes == 1) { // a single root node: use it
mScene->mRootNode = ImportNode(mScene, r, meshOffsets, rootNodes[0]);
} else if (numRootNodes > 1) { // more than one root node: create a fake root
aiNode *root = new aiNode("ROOT");
root->mChildren = new aiNode *[numRootNodes];
for (unsigned int i = 0; i < numRootNodes; ++i) {
aiNode *node = ImportNode(mScene, r, meshOffsets, rootNodes[i]);
node->mParent = root;
root->mChildren[root->mNumChildren++] = node;
}
mScene->mRootNode = root;
}
}
void glTFImporter::ImportEmbeddedTextures(Asset &r) {
embeddedTexIdxs.resize(r.images.Size(), -1);
int numEmbeddedTexs = 0;
for (size_t i = 0; i < r.images.Size(); ++i) {
if (r.images[i].HasData())
numEmbeddedTexs += 1;
}
if (numEmbeddedTexs == 0) {
return;
}
mScene->mTextures = new aiTexture *[numEmbeddedTexs];
// Add the embedded textures
for (size_t i = 0; i < r.images.Size(); ++i) {
Image &img = r.images[i];
if (!img.HasData()) continue;
int idx = mScene->mNumTextures++;
embeddedTexIdxs[i] = idx;
aiTexture *tex = mScene->mTextures[idx] = new aiTexture();
const size_t length = img.GetDataLength();
void *data = img.StealData();
tex->mFilename = img.name;
tex->mWidth = static_cast<unsigned int>(length);
tex->mHeight = 0;
tex->pcData = static_cast<aiTexel *>(data);
if (!img.mimeType.empty()) {
if (const char *ext = strchr(img.mimeType.c_str(), '/') + 1) {
if (strncmp(ext, "jpeg", 4) == 0) {
ext = "jpg";
}
tex->achFormatHint[3] = '\0';
size_t len = strlen(ext);
if (len > 3) len = 3;
memcpy(tex->achFormatHint, ext, len);
}
}
}
}
void glTFImporter::ImportCommonMetadata(const Asset &a) const {
ai_assert(mScene->mMetaData == nullptr);
const bool hasVersion = !a.asset.version.empty();
const bool hasGenerator = !a.asset.generator.empty();
const bool hasCopyright = !a.asset.copyright.empty();
if (hasVersion || hasGenerator || hasCopyright) {
mScene->mMetaData = new aiMetadata;
if (hasVersion) {
mScene->mMetaData->Add(AI_METADATA_SOURCE_FORMAT_VERSION, aiString(a.asset.version));
}
if (hasGenerator) {
mScene->mMetaData->Add(AI_METADATA_SOURCE_GENERATOR, aiString(a.asset.generator));
}
if (hasCopyright) {
mScene->mMetaData->Add(AI_METADATA_SOURCE_COPYRIGHT, aiString(a.asset.copyright));
}
}
}
void glTFImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
// clean all member arrays
meshOffsets.clear();
embeddedTexIdxs.clear();
this->mScene = pScene;
// read the asset file
Asset asset(pIOHandler);
asset.Load(pFile,
CheckMagicToken(
pIOHandler, pFile, AI_GLB_MAGIC_NUMBER, 1, 0,
static_cast<unsigned int>(strlen(AI_GLB_MAGIC_NUMBER))));
//
// Copy the data out
//
ImportEmbeddedTextures(asset);
ImportMaterials(asset);
ImportMeshes(asset);
ImportCameras(asset);
ImportLights(asset);
ImportNodes(asset);
ImportCommonMetadata(asset);
if (pScene->mNumMeshes == 0) {
pScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
}
}
#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER

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/*
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
#ifndef AI_GLTFIMPORTER_H_INC
#define AI_GLTFIMPORTER_H_INC
#include <assimp/BaseImporter.h>
#include <assimp/DefaultIOSystem.h>
struct aiNode;
namespace glTF {
class Asset;
}
namespace Assimp {
/**
* Load the glTF format.
* https://github.com/KhronosGroup/glTF/tree/master/specification
*/
class glTFImporter : public BaseImporter {
public:
glTFImporter();
~glTFImporter() override = default;
bool CanRead(const std::string &pFile, IOSystem *pIOHandler, bool checkSig) const override;
protected:
const aiImporterDesc *GetInfo() const override;
void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;
private:
void ImportEmbeddedTextures(glTF::Asset &a);
void ImportMaterials(glTF::Asset &a) const;
void ImportMeshes(glTF::Asset &a);
void ImportCameras(glTF::Asset &a) const;
void ImportLights(glTF::Asset &a) const;
void ImportNodes(glTF::Asset &a);
void ImportCommonMetadata(const glTF::Asset &a) const;
private:
std::vector<unsigned int> meshOffsets;
std::vector<int> embeddedTexIdxs;
aiScene *mScene;
};
} // namespace Assimp
#endif // AI_GLTFIMPORTER_H_INC