delete src/mesh/assimp-master

1 files changed, 0 insertions, 1542 deletions

diff --git a/src/mesh/assimp-master/code/AssetLib/glTF2/glTF2Exporter.cpp b/src/mesh/assimp-master/code/AssetLib/glTF2/glTF2Exporter.cpp
deleted file mode 100644
index ffd8d22..0000000
--- a/src/mesh/assimp-master/code/AssetLib/glTF2/glTF2Exporter.cpp
+++ /dev/null
@@ -1,1542 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2022, 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_BUILD_NO_EXPORT
-#ifndef ASSIMP_BUILD_NO_GLTF_EXPORTER
-
-#include "AssetLib/glTF2/glTF2Exporter.h"
-#include "AssetLib/glTF2/glTF2AssetWriter.h"
-#include "PostProcessing/SplitLargeMeshes.h"
-
-#include <assimp/ByteSwapper.h>
-#include <assimp/Exceptional.h>
-#include <assimp/SceneCombiner.h>
-#include <assimp/StringComparison.h>
-#include <assimp/commonMetaData.h>
-#include <assimp/material.h>
-#include <assimp/scene.h>
-#include <assimp/version.h>
-#include <assimp/Exporter.hpp>
-#include <assimp/IOSystem.hpp>
-
-// Header files, standard library.
-#include <cinttypes>
-#include <limits>
-#include <memory>
-
-using namespace rapidjson;
-
-using namespace Assimp;
-using namespace glTF2;
-
-namespace Assimp {
-
-// ------------------------------------------------------------------------------------------------
-// Worker function for exporting a scene to GLTF. Prototyped and registered in Exporter.cpp
-void ExportSceneGLTF2(const char *pFile, IOSystem *pIOSystem, const aiScene *pScene, const ExportProperties *pProperties) {
-    // invoke the exporter
-    glTF2Exporter exporter(pFile, pIOSystem, pScene, pProperties, false);
-}
-
-// ------------------------------------------------------------------------------------------------
-// Worker function for exporting a scene to GLB. Prototyped and registered in Exporter.cpp
-void ExportSceneGLB2(const char *pFile, IOSystem *pIOSystem, const aiScene *pScene, const ExportProperties *pProperties) {
-    // invoke the exporter
-    glTF2Exporter exporter(pFile, pIOSystem, pScene, pProperties, true);
-}
-
-} // end of namespace Assimp
-
-glTF2Exporter::glTF2Exporter(const char *filename, IOSystem *pIOSystem, const aiScene *pScene,
-        const ExportProperties *pProperties, bool isBinary) :
-        mFilename(filename), mIOSystem(pIOSystem), mScene(pScene), mProperties(pProperties), mAsset(new Asset(pIOSystem)) {
-    // Always on as our triangulation process is aware of this type of encoding
-    mAsset->extensionsUsed.FB_ngon_encoding = true;
-
-    if (isBinary) {
-        mAsset->SetAsBinary();
-    }
-
-    ExportMetadata();
-
-    ExportMaterials();
-
-    if (mScene->mRootNode) {
-        ExportNodeHierarchy(mScene->mRootNode);
-    }
-
-    ExportMeshes();
-    MergeMeshes();
-
-    ExportScene();
-
-    ExportAnimations();
-
-    // export extras
-    if (mProperties->HasPropertyCallback("extras")) {
-        std::function<void *(void *)> ExportExtras = mProperties->GetPropertyCallback("extras");
-        mAsset->extras = (rapidjson::Value *)ExportExtras(0);
-    }
-
-    AssetWriter writer(*mAsset);
-
-    if (isBinary) {
-        writer.WriteGLBFile(filename);
-    } else {
-        writer.WriteFile(filename);
-    }
-}
-
-glTF2Exporter::~glTF2Exporter() {
-    // empty
-}
-
-/*
- * Copy a 4x4 matrix from struct aiMatrix to typedef mat4.
- * Also converts from row-major to column-major storage.
- */
-static void CopyValue(const aiMatrix4x4 &v, mat4 &o) {
-    o[0] = v.a1;
-    o[1] = v.b1;
-    o[2] = v.c1;
-    o[3] = v.d1;
-    o[4] = v.a2;
-    o[5] = v.b2;
-    o[6] = v.c2;
-    o[7] = v.d2;
-    o[8] = v.a3;
-    o[9] = v.b3;
-    o[10] = v.c3;
-    o[11] = v.d3;
-    o[12] = v.a4;
-    o[13] = v.b4;
-    o[14] = v.c4;
-    o[15] = v.d4;
-}
-
-static void CopyValue(const aiMatrix4x4 &v, aiMatrix4x4 &o) {
-    memcpy(&o, &v, sizeof(aiMatrix4x4));
-}
-
-static void IdentityMatrix4(mat4 &o) {
-    o[0] = 1;
-    o[1] = 0;
-    o[2] = 0;
-    o[3] = 0;
-    o[4] = 0;
-    o[5] = 1;
-    o[6] = 0;
-    o[7] = 0;
-    o[8] = 0;
-    o[9] = 0;
-    o[10] = 1;
-    o[11] = 0;
-    o[12] = 0;
-    o[13] = 0;
-    o[14] = 0;
-    o[15] = 1;
-}
-
-static bool IsBoneWeightFitted(vec4 &weight) {
-    return weight[0] + weight[1] + weight[2] + weight[3] >= 1.f;
-}
-
-static int FitBoneWeight(vec4 &weight, float value) {
-    int i = 0;
-    for (; i < 4; ++i) {
-        if (weight[i] < value) {
-            weight[i] = value;
-            return i;
-        }
-    }
-
-    return -1;
-}
-
-template <typename T>
-void SetAccessorRange(Ref<Accessor> acc, void *data, size_t count,
-        unsigned int numCompsIn, unsigned int numCompsOut) {
-    ai_assert(numCompsOut <= numCompsIn);
-
-    // Allocate and initialize with large values.
-    for (unsigned int i = 0; i < numCompsOut; i++) {
-        acc->min.push_back(std::numeric_limits<double>::max());
-        acc->max.push_back(-std::numeric_limits<double>::max());
-    }
-
-    size_t totalComps = count * numCompsIn;
-    T *buffer_ptr = static_cast<T *>(data);
-    T *buffer_end = buffer_ptr + totalComps;
-
-    // Search and set extreme values.
-    for (; buffer_ptr < buffer_end; buffer_ptr += numCompsIn) {
-        for (unsigned int j = 0; j < numCompsOut; j++) {
-            double valueTmp = buffer_ptr[j];
-
-            // Gracefully tolerate rogue NaN's in buffer data
-            // Any NaNs/Infs introduced in accessor bounds will end up in
-            // document and prevent rapidjson from writing out valid JSON
-            if (!std::isfinite(valueTmp)) {
-                continue;
-            }
-
-            if (valueTmp < acc->min[j]) {
-                acc->min[j] = valueTmp;
-            }
-            if (valueTmp > acc->max[j]) {
-                acc->max[j] = valueTmp;
-            }
-        }
-    }
-}
-
-inline void SetAccessorRange(ComponentType compType, Ref<Accessor> acc, void *data,
-        size_t count, unsigned int numCompsIn, unsigned int numCompsOut) {
-    switch (compType) {
-    case ComponentType_SHORT:
-        SetAccessorRange<short>(acc, data, count, numCompsIn, numCompsOut);
-        return;
-    case ComponentType_UNSIGNED_SHORT:
-        SetAccessorRange<unsigned short>(acc, data, count, numCompsIn, numCompsOut);
-        return;
-    case ComponentType_UNSIGNED_INT:
-        SetAccessorRange<unsigned int>(acc, data, count, numCompsIn, numCompsOut);
-        return;
-    case ComponentType_FLOAT:
-        SetAccessorRange<float>(acc, data, count, numCompsIn, numCompsOut);
-        return;
-    case ComponentType_BYTE:
-        SetAccessorRange<int8_t>(acc, data, count, numCompsIn, numCompsOut);
-        return;
-    case ComponentType_UNSIGNED_BYTE:
-        SetAccessorRange<uint8_t>(acc, data, count, numCompsIn, numCompsOut);
-        return;
-    }
-}
-
-// compute the (data-dataBase), store the non-zero data items
-template <typename T>
-size_t NZDiff(void *data, void *dataBase, size_t count, unsigned int numCompsIn, unsigned int numCompsOut, void *&outputNZDiff, void *&outputNZIdx) {
-    std::vector<T> vNZDiff;
-    std::vector<unsigned short> vNZIdx;
-    size_t totalComps = count * numCompsIn;
-    T *bufferData_ptr = static_cast<T *>(data);
-    T *bufferData_end = bufferData_ptr + totalComps;
-    T *bufferBase_ptr = static_cast<T *>(dataBase);
-
-    // Search and set extreme values.
-    for (short idx = 0; bufferData_ptr < bufferData_end; idx += 1, bufferData_ptr += numCompsIn) {
-        bool bNonZero = false;
-
-        //for the data, check any component Non Zero
-        for (unsigned int j = 0; j < numCompsOut; j++) {
-            double valueData = bufferData_ptr[j];
-            double valueBase = bufferBase_ptr ? bufferBase_ptr[j] : 0;
-            if ((valueData - valueBase) != 0) {
-                bNonZero = true;
-                break;
-            }
-        }
-
-        //all zeros, continue
-        if (!bNonZero)
-            continue;
-
-        //non zero, store the data
-        for (unsigned int j = 0; j < numCompsOut; j++) {
-            T valueData = bufferData_ptr[j];
-            T valueBase = bufferBase_ptr ? bufferBase_ptr[j] : 0;
-            vNZDiff.push_back(valueData - valueBase);
-        }
-        vNZIdx.push_back(idx);
-    }
-
-    //avoid all-0, put 1 item
-    if (vNZDiff.size() == 0) {
-        for (unsigned int j = 0; j < numCompsOut; j++)
-            vNZDiff.push_back(0);
-        vNZIdx.push_back(0);
-    }
-
-    //process data
-    outputNZDiff = new T[vNZDiff.size()];
-    memcpy(outputNZDiff, vNZDiff.data(), vNZDiff.size() * sizeof(T));
-
-    outputNZIdx = new unsigned short[vNZIdx.size()];
-    memcpy(outputNZIdx, vNZIdx.data(), vNZIdx.size() * sizeof(unsigned short));
-    return vNZIdx.size();
-}
-
-inline size_t NZDiff(ComponentType compType, void *data, void *dataBase, size_t count, unsigned int numCompsIn, unsigned int numCompsOut, void *&nzDiff, void *&nzIdx) {
-    switch (compType) {
-    case ComponentType_SHORT:
-        return NZDiff<short>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-    case ComponentType_UNSIGNED_SHORT:
-        return NZDiff<unsigned short>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-    case ComponentType_UNSIGNED_INT:
-        return NZDiff<unsigned int>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-    case ComponentType_FLOAT:
-        return NZDiff<float>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-    case ComponentType_BYTE:
-        return NZDiff<int8_t>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-    case ComponentType_UNSIGNED_BYTE:
-        return NZDiff<uint8_t>(data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-    }
-    return 0;
-}
-
-inline Ref<Accessor> ExportDataSparse(Asset &a, std::string &meshName, Ref<Buffer> &buffer,
-        size_t count, void *data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, BufferViewTarget target = BufferViewTarget_NONE, void *dataBase = 0) {
-    if (!count || !data) {
-        return Ref<Accessor>();
-    }
-
-    unsigned int numCompsIn = AttribType::GetNumComponents(typeIn);
-    unsigned int numCompsOut = AttribType::GetNumComponents(typeOut);
-    unsigned int bytesPerComp = ComponentTypeSize(compType);
-
-    // accessor
-    Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor"));
-
-    // if there is a basic data vector
-    if (dataBase) {
-        size_t base_offset = buffer->byteLength;
-        size_t base_padding = base_offset % bytesPerComp;
-        base_offset += base_padding;
-        size_t base_length = count * numCompsOut * bytesPerComp;
-        buffer->Grow(base_length + base_padding);
-
-        Ref<BufferView> bv = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
-        bv->buffer = buffer;
-        bv->byteOffset = base_offset;
-        bv->byteLength = base_length; //! The target that the WebGL buffer should be bound to.
-        bv->byteStride = 0;
-        bv->target = target;
-        acc->bufferView = bv;
-        acc->WriteData(count, dataBase, numCompsIn * bytesPerComp);
-    }
-    acc->byteOffset = 0;
-    acc->componentType = compType;
-    acc->count = count;
-    acc->type = typeOut;
-
-    if (data) {
-        void *nzDiff = 0, *nzIdx = 0;
-        size_t nzCount = NZDiff(compType, data, dataBase, count, numCompsIn, numCompsOut, nzDiff, nzIdx);
-        acc->sparse.reset(new Accessor::Sparse);
-        acc->sparse->count = nzCount;
-
-        //indices
-        unsigned int bytesPerIdx = sizeof(unsigned short);
-        size_t indices_offset = buffer->byteLength;
-        size_t indices_padding = indices_offset % bytesPerIdx;
-        indices_offset += indices_padding;
-        size_t indices_length = nzCount * 1 * bytesPerIdx;
-        buffer->Grow(indices_length + indices_padding);
-
-        Ref<BufferView> indicesBV = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
-        indicesBV->buffer = buffer;
-        indicesBV->byteOffset = indices_offset;
-        indicesBV->byteLength = indices_length;
-        indicesBV->byteStride = 0;
-        acc->sparse->indices = indicesBV;
-        acc->sparse->indicesType = ComponentType_UNSIGNED_SHORT;
-        acc->sparse->indicesByteOffset = 0;
-        acc->WriteSparseIndices(nzCount, nzIdx, 1 * bytesPerIdx);
-
-        //values
-        size_t values_offset = buffer->byteLength;
-        size_t values_padding = values_offset % bytesPerComp;
-        values_offset += values_padding;
-        size_t values_length = nzCount * numCompsOut * bytesPerComp;
-        buffer->Grow(values_length + values_padding);
-
-        Ref<BufferView> valuesBV = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
-        valuesBV->buffer = buffer;
-        valuesBV->byteOffset = values_offset;
-        valuesBV->byteLength = values_length;
-        valuesBV->byteStride = 0;
-        acc->sparse->values = valuesBV;
-        acc->sparse->valuesByteOffset = 0;
-        acc->WriteSparseValues(nzCount, nzDiff, numCompsIn * bytesPerComp);
-
-        //clear
-        delete[](char *) nzDiff;
-        delete[](char *) nzIdx;
-    }
-    return acc;
-}
-inline Ref<Accessor> ExportData(Asset &a, std::string &meshName, Ref<Buffer> &buffer,
-        size_t count, void *data, AttribType::Value typeIn, AttribType::Value typeOut, ComponentType compType, BufferViewTarget target = BufferViewTarget_NONE) {
-    if (!count || !data) {
-        return Ref<Accessor>();
-    }
-
-    unsigned int numCompsIn = AttribType::GetNumComponents(typeIn);
-    unsigned int numCompsOut = AttribType::GetNumComponents(typeOut);
-    unsigned int bytesPerComp = ComponentTypeSize(compType);
-
-    size_t offset = buffer->byteLength;
-    // make sure offset is correctly byte-aligned, as required by spec
-    size_t padding = offset % bytesPerComp;
-    offset += padding;
-    size_t length = count * numCompsOut * bytesPerComp;
-    buffer->Grow(length + padding);
-
-    // bufferView
-    Ref<BufferView> bv = a.bufferViews.Create(a.FindUniqueID(meshName, "view"));
-    bv->buffer = buffer;
-    bv->byteOffset = offset;
-    bv->byteLength = length; //! The target that the WebGL buffer should be bound to.
-    bv->byteStride = 0;
-    bv->target = target;
-
-    // accessor
-    Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor"));
-    acc->bufferView = bv;
-    acc->byteOffset = 0;
-    acc->componentType = compType;
-    acc->count = count;
-    acc->type = typeOut;
-
-    // calculate min and max values
-    SetAccessorRange(compType, acc, data, count, numCompsIn, numCompsOut);
-
-    // copy the data
-    acc->WriteData(count, data, numCompsIn * bytesPerComp);
-
-    return acc;
-}
-
-inline void SetSamplerWrap(SamplerWrap &wrap, aiTextureMapMode map) {
-    switch (map) {
-    case aiTextureMapMode_Clamp:
-        wrap = SamplerWrap::Clamp_To_Edge;
-        break;
-    case aiTextureMapMode_Mirror:
-        wrap = SamplerWrap::Mirrored_Repeat;
-        break;
-    case aiTextureMapMode_Wrap:
-    case aiTextureMapMode_Decal:
-    default:
-        wrap = SamplerWrap::Repeat;
-        break;
-    };
-}
-
-void glTF2Exporter::GetTexSampler(const aiMaterial &mat, Ref<Texture> texture, aiTextureType tt, unsigned int slot) {
-    aiString aId;
-    std::string id;
-    if (aiGetMaterialString(&mat, AI_MATKEY_GLTF_MAPPINGID(tt, slot), &aId) == AI_SUCCESS) {
-        id = aId.C_Str();
-    }
-
-    if (Ref<Sampler> ref = mAsset->samplers.Get(id.c_str())) {
-        texture->sampler = ref;
-    } else {
-        id = mAsset->FindUniqueID(id, "sampler");
-
-        texture->sampler = mAsset->samplers.Create(id.c_str());
-
-        aiTextureMapMode mapU, mapV;
-        SamplerMagFilter filterMag;
-        SamplerMinFilter filterMin;
-
-        if (aiGetMaterialInteger(&mat, AI_MATKEY_MAPPINGMODE_U(tt, slot), (int *)&mapU) == AI_SUCCESS) {
-            SetSamplerWrap(texture->sampler->wrapS, mapU);
-        }
-
-        if (aiGetMaterialInteger(&mat, AI_MATKEY_MAPPINGMODE_V(tt, slot), (int *)&mapV) == AI_SUCCESS) {
-            SetSamplerWrap(texture->sampler->wrapT, mapV);
-        }
-
-        if (aiGetMaterialInteger(&mat, AI_MATKEY_GLTF_MAPPINGFILTER_MAG(tt, slot), (int *)&filterMag) == AI_SUCCESS) {
-            texture->sampler->magFilter = filterMag;
-        }
-
-        if (aiGetMaterialInteger(&mat, AI_MATKEY_GLTF_MAPPINGFILTER_MIN(tt, slot), (int *)&filterMin) == AI_SUCCESS) {
-            texture->sampler->minFilter = filterMin;
-        }
-
-        aiString name;
-        if (aiGetMaterialString(&mat, AI_MATKEY_GLTF_MAPPINGNAME(tt, slot), &name) == AI_SUCCESS) {
-            texture->sampler->name = name.C_Str();
-        }
-    }
-}
-
-void glTF2Exporter::GetMatTexProp(const aiMaterial &mat, unsigned int &prop, const char *propName, aiTextureType tt, unsigned int slot) {
-    std::string textureKey = std::string(_AI_MATKEY_TEXTURE_BASE) + "." + propName;
-
-    mat.Get(textureKey.c_str(), tt, slot, prop);
-}
-
-void glTF2Exporter::GetMatTexProp(const aiMaterial &mat, float &prop, const char *propName, aiTextureType tt, unsigned int slot) {
-    std::string textureKey = std::string(_AI_MATKEY_TEXTURE_BASE) + "." + propName;
-
-    mat.Get(textureKey.c_str(), tt, slot, prop);
-}
-
-void glTF2Exporter::GetMatTex(const aiMaterial &mat, Ref<Texture> &texture, unsigned int &texCoord, aiTextureType tt, unsigned int slot = 0) {
-    if (mat.GetTextureCount(tt) == 0) {
-        return;
-    }
-        
-    aiString tex;
-
-    // Read texcoord (UV map index)
-    mat.Get(AI_MATKEY_UVWSRC(tt, slot), texCoord);
-
-    if (mat.Get(AI_MATKEY_TEXTURE(tt, slot), tex) == AI_SUCCESS) {
-        std::string path = tex.C_Str();
-
-        if (path.size() > 0) {
-            std::map<std::string, unsigned int>::iterator it = mTexturesByPath.find(path);
-            if (it != mTexturesByPath.end()) {
-                texture = mAsset->textures.Get(it->second);
-            }
-
-            bool useBasisUniversal = false;
-            if (!texture) {
-                std::string texId = mAsset->FindUniqueID("", "texture");
-                texture = mAsset->textures.Create(texId);
-                mTexturesByPath[path] = texture.GetIndex();
-
-                std::string imgId = mAsset->FindUniqueID("", "image");
-                texture->source = mAsset->images.Create(imgId);
-
-                const aiTexture *curTex = mScene->GetEmbeddedTexture(path.c_str());
-                if (curTex != nullptr) { // embedded
-                    texture->source->name = curTex->mFilename.C_Str();
-
-                    //basisu: embedded ktx2, bu
-                    if (curTex->achFormatHint[0]) {
-                        std::string mimeType = "image/";
-                        if (memcmp(curTex->achFormatHint, "jpg", 3) == 0)
-                            mimeType += "jpeg";
-                        else if (memcmp(curTex->achFormatHint, "ktx", 3) == 0) {
-                            useBasisUniversal = true;
-                            mimeType += "ktx";
-                        } else if (memcmp(curTex->achFormatHint, "kx2", 3) == 0) {
-                            useBasisUniversal = true;
-                            mimeType += "ktx2";
-                        } else if (memcmp(curTex->achFormatHint, "bu", 2) == 0) {
-                            useBasisUniversal = true;
-                            mimeType += "basis";
-                        } else
-                            mimeType += curTex->achFormatHint;
-                        texture->source->mimeType = mimeType;
-                    }
-
-                    // The asset has its own buffer, see Image::SetData
-                    //basisu: "image/ktx2", "image/basis" as is
-                    texture->source->SetData(reinterpret_cast<uint8_t *>(curTex->pcData), curTex->mWidth, *mAsset);
-                } else {
-                    texture->source->uri = path;
-                    if (texture->source->uri.find(".ktx") != std::string::npos ||
-                            texture->source->uri.find(".basis") != std::string::npos) {
-                        useBasisUniversal = true;
-                    }
-                }
-
-                //basisu
-                if (useBasisUniversal) {
-                    mAsset->extensionsUsed.KHR_texture_basisu = true;
-                    mAsset->extensionsRequired.KHR_texture_basisu = true;
-                }
-
-                GetTexSampler(mat, texture, tt, slot);
-            }
-        }
-    }
-}
-
-void glTF2Exporter::GetMatTex(const aiMaterial &mat, TextureInfo &prop, aiTextureType tt, unsigned int slot = 0) {
-    Ref<Texture> &texture = prop.texture;
-    GetMatTex(mat, texture, prop.texCoord, tt, slot);
-}
-
-void glTF2Exporter::GetMatTex(const aiMaterial &mat, NormalTextureInfo &prop, aiTextureType tt, unsigned int slot = 0) {
-    Ref<Texture> &texture = prop.texture;
-
-    GetMatTex(mat, texture, prop.texCoord, tt, slot);
-
-    if (texture) {
-        //GetMatTexProp(mat, prop.texCoord, "texCoord", tt, slot);
-        GetMatTexProp(mat, prop.scale, "scale", tt, slot);
-    }
-}
-
-void glTF2Exporter::GetMatTex(const aiMaterial &mat, OcclusionTextureInfo &prop, aiTextureType tt, unsigned int slot = 0) {
-    Ref<Texture> &texture = prop.texture;
-
-    GetMatTex(mat, texture, prop.texCoord, tt, slot);
-
-    if (texture) {
-        //GetMatTexProp(mat, prop.texCoord, "texCoord", tt, slot);
-        GetMatTexProp(mat, prop.strength, "strength", tt, slot);
-    }
-}
-
-aiReturn glTF2Exporter::GetMatColor(const aiMaterial &mat, vec4 &prop, const char *propName, int type, int idx) const {
-    aiColor4D col;
-    aiReturn result = mat.Get(propName, type, idx, col);
-
-    if (result == AI_SUCCESS) {
-        prop[0] = col.r;
-        prop[1] = col.g;
-        prop[2] = col.b;
-        prop[3] = col.a;
-    }
-
-    return result;
-}
-
-aiReturn glTF2Exporter::GetMatColor(const aiMaterial &mat, vec3 &prop, const char *propName, int type, int idx) const {
-    aiColor3D col;
-    aiReturn result = mat.Get(propName, type, idx, col);
-
-    if (result == AI_SUCCESS) {
-        prop[0] = col.r;
-        prop[1] = col.g;
-        prop[2] = col.b;
-    }
-
-    return result;
-}
-
-bool glTF2Exporter::GetMatSpecGloss(const aiMaterial &mat, glTF2::PbrSpecularGlossiness &pbrSG) {
-    bool result = false;
-    // If has Glossiness, a Specular Color or Specular Texture, use the KHR_materials_pbrSpecularGlossiness extension
-    // NOTE: This extension is being considered for deprecation (Dec 2020), may be replaced by KHR_material_specular
-
-    if (mat.Get(AI_MATKEY_GLOSSINESS_FACTOR, pbrSG.glossinessFactor) == AI_SUCCESS) {
-        result = true;
-    } else {
-        // Don't have explicit glossiness, convert from pbr roughness or legacy shininess
-        float shininess;
-        if (mat.Get(AI_MATKEY_ROUGHNESS_FACTOR, shininess) == AI_SUCCESS) {
-            pbrSG.glossinessFactor = 1.0f - shininess; // Extension defines this way
-        } else if (mat.Get(AI_MATKEY_SHININESS, shininess) == AI_SUCCESS) {
-            pbrSG.glossinessFactor = shininess / 1000;
-        }
-    }
-
-    if (GetMatColor(mat, pbrSG.specularFactor, AI_MATKEY_COLOR_SPECULAR) == AI_SUCCESS) {
-        result = true;
-    }
-    // Add any appropriate textures
-    GetMatTex(mat, pbrSG.specularGlossinessTexture, aiTextureType_SPECULAR);
-
-    result = result || pbrSG.specularGlossinessTexture.texture;
-
-    if (result) {
-        // Likely to always have diffuse
-        GetMatTex(mat, pbrSG.diffuseTexture, aiTextureType_DIFFUSE);
-        GetMatColor(mat, pbrSG.diffuseFactor, AI_MATKEY_COLOR_DIFFUSE);
-    }
-
-    return result;
-}
-
-bool glTF2Exporter::GetMatSheen(const aiMaterial &mat, glTF2::MaterialSheen &sheen) {
-    // Return true if got any valid Sheen properties or textures
-    if (GetMatColor(mat, sheen.sheenColorFactor, AI_MATKEY_SHEEN_COLOR_FACTOR) != aiReturn_SUCCESS) {
-        return false;
-    }
-
-    // Default Sheen color factor {0,0,0} disables Sheen, so do not export
-    if (sheen.sheenColorFactor == defaultSheenFactor) {
-        return false;
-    }
-
-    mat.Get(AI_MATKEY_SHEEN_ROUGHNESS_FACTOR, sheen.sheenRoughnessFactor);
-
-    GetMatTex(mat, sheen.sheenColorTexture, AI_MATKEY_SHEEN_COLOR_TEXTURE);
-    GetMatTex(mat, sheen.sheenRoughnessTexture, AI_MATKEY_SHEEN_ROUGHNESS_TEXTURE);
-
-    return true;
-}
-
-bool glTF2Exporter::GetMatClearcoat(const aiMaterial &mat, glTF2::MaterialClearcoat &clearcoat) {
-    if (mat.Get(AI_MATKEY_CLEARCOAT_FACTOR, clearcoat.clearcoatFactor) != aiReturn_SUCCESS) {
-        return false;
-    }
-
-    // Clearcoat factor of zero disables Clearcoat, so do not export
-    if (clearcoat.clearcoatFactor == 0.0f)
-        return false;
-
-    mat.Get(AI_MATKEY_CLEARCOAT_ROUGHNESS_FACTOR, clearcoat.clearcoatRoughnessFactor);
-
-    GetMatTex(mat, clearcoat.clearcoatTexture, AI_MATKEY_CLEARCOAT_TEXTURE);
-    GetMatTex(mat, clearcoat.clearcoatRoughnessTexture, AI_MATKEY_CLEARCOAT_ROUGHNESS_TEXTURE);
-    GetMatTex(mat, clearcoat.clearcoatNormalTexture, AI_MATKEY_CLEARCOAT_NORMAL_TEXTURE);
-
-    return true;
-}
-
-bool glTF2Exporter::GetMatTransmission(const aiMaterial &mat, glTF2::MaterialTransmission &transmission) {
-    bool result = mat.Get(AI_MATKEY_TRANSMISSION_FACTOR, transmission.transmissionFactor) == aiReturn_SUCCESS;
-    GetMatTex(mat, transmission.transmissionTexture, AI_MATKEY_TRANSMISSION_TEXTURE);
-    return result || transmission.transmissionTexture.texture;
-}
-
-bool glTF2Exporter::GetMatVolume(const aiMaterial &mat, glTF2::MaterialVolume &volume) {
-    bool result = mat.Get(AI_MATKEY_VOLUME_THICKNESS_FACTOR, volume.thicknessFactor) != aiReturn_SUCCESS;
-
-    GetMatTex(mat, volume.thicknessTexture, AI_MATKEY_VOLUME_THICKNESS_TEXTURE);
-
-    result = result || mat.Get(AI_MATKEY_VOLUME_ATTENUATION_DISTANCE, volume.attenuationDistance);
-    result = result || GetMatColor(mat, volume.attenuationColor, AI_MATKEY_VOLUME_ATTENUATION_COLOR) != aiReturn_SUCCESS;
-
-    // Valid if any of these properties are available
-    return result || volume.thicknessTexture.texture;
-}
-
-bool glTF2Exporter::GetMatIOR(const aiMaterial &mat, glTF2::MaterialIOR &ior) {
-    return mat.Get(AI_MATKEY_REFRACTI, ior.ior) == aiReturn_SUCCESS;
-}
-
-void glTF2Exporter::ExportMaterials() {
-    aiString aiName;
-    for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) {
-        ai_assert(mScene->mMaterials[i] != nullptr);
-
-        const aiMaterial &mat = *(mScene->mMaterials[i]);
-
-        std::string id = "material_" + ai_to_string(i);
-
-        Ref<Material> m = mAsset->materials.Create(id);
-
-        std::string name;
-        if (mat.Get(AI_MATKEY_NAME, aiName) == AI_SUCCESS) {
-            name = aiName.C_Str();
-        }
-        name = mAsset->FindUniqueID(name, "material");
-
-        m->name = name;
-
-        GetMatTex(mat, m->pbrMetallicRoughness.baseColorTexture, aiTextureType_BASE_COLOR);
-
-        if (!m->pbrMetallicRoughness.baseColorTexture.texture) {
-            //if there wasn't a baseColorTexture defined in the source, fallback to any diffuse texture
-            GetMatTex(mat, m->pbrMetallicRoughness.baseColorTexture, aiTextureType_DIFFUSE);
-        }
-
-        GetMatTex(mat, m->pbrMetallicRoughness.metallicRoughnessTexture, AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE);
-
-        if (GetMatColor(mat, m->pbrMetallicRoughness.baseColorFactor, AI_MATKEY_BASE_COLOR) != AI_SUCCESS) {
-            // if baseColorFactor wasn't defined, then the source is likely not a metallic roughness material.
-            //a fallback to any diffuse color should be used instead
-            GetMatColor(mat, m->pbrMetallicRoughness.baseColorFactor, AI_MATKEY_COLOR_DIFFUSE);
-        }
-
-        if (mat.Get(AI_MATKEY_METALLIC_FACTOR, m->pbrMetallicRoughness.metallicFactor) != AI_SUCCESS) {
-            //if metallicFactor wasn't defined, then the source is likely not a PBR file, and the metallicFactor should be 0
-            m->pbrMetallicRoughness.metallicFactor = 0;
-        }
-
-        // get roughness if source is gltf2 file
-        if (mat.Get(AI_MATKEY_ROUGHNESS_FACTOR, m->pbrMetallicRoughness.roughnessFactor) != AI_SUCCESS) {
-            // otherwise, try to derive and convert from specular + shininess values
-            aiColor4D specularColor;
-            ai_real shininess;
-
-            if (mat.Get(AI_MATKEY_COLOR_SPECULAR, specularColor) == AI_SUCCESS && mat.Get(AI_MATKEY_SHININESS, shininess) == AI_SUCCESS) {
-                // convert specular color to luminance
-                float specularIntensity = specularColor[0] * 0.2125f + specularColor[1] * 0.7154f + specularColor[2] * 0.0721f;
-                //normalize shininess (assuming max is 1000) with an inverse exponentional curve
-                float normalizedShininess = std::sqrt(shininess / 1000);
-
-                //clamp the shininess value between 0 and 1
-                normalizedShininess = std::min(std::max(normalizedShininess, 0.0f), 1.0f);
-                // low specular intensity values should produce a rough material even if shininess is high.
-                normalizedShininess = normalizedShininess * specularIntensity;
-
-                m->pbrMetallicRoughness.roughnessFactor = 1 - normalizedShininess;
-            }
-        }
-
-        GetMatTex(mat, m->normalTexture, aiTextureType_NORMALS);
-        GetMatTex(mat, m->occlusionTexture, aiTextureType_LIGHTMAP);
-        GetMatTex(mat, m->emissiveTexture, aiTextureType_EMISSIVE);
-        GetMatColor(mat, m->emissiveFactor, AI_MATKEY_COLOR_EMISSIVE);
-
-        mat.Get(AI_MATKEY_TWOSIDED, m->doubleSided);
-        mat.Get(AI_MATKEY_GLTF_ALPHACUTOFF, m->alphaCutoff);
-
-        float opacity;
-        aiString alphaMode;
-
-        if (mat.Get(AI_MATKEY_OPACITY, opacity) == AI_SUCCESS) {
-            if (opacity < 1) {
-                m->alphaMode = "BLEND";
-                m->pbrMetallicRoughness.baseColorFactor[3] *= opacity;
-            }
-        }
-        if (mat.Get(AI_MATKEY_GLTF_ALPHAMODE, alphaMode) == AI_SUCCESS) {
-            m->alphaMode = alphaMode.C_Str();
-        }
-
-        {
-            // KHR_materials_pbrSpecularGlossiness extension
-            // NOTE: This extension is being considered for deprecation (Dec 2020)
-            PbrSpecularGlossiness pbrSG;
-            if (GetMatSpecGloss(mat, pbrSG)) {
-                mAsset->extensionsUsed.KHR_materials_pbrSpecularGlossiness = true;
-                m->pbrSpecularGlossiness = Nullable<PbrSpecularGlossiness>(pbrSG);
-            }
-        }
-
-        // glTFv2 is either PBR or Unlit
-        aiShadingMode shadingMode = aiShadingMode_PBR_BRDF;
-        mat.Get(AI_MATKEY_SHADING_MODEL, shadingMode);
-        if (shadingMode == aiShadingMode_Unlit) {
-            mAsset->extensionsUsed.KHR_materials_unlit = true;
-            m->unlit = true;
-        } else {
-            // These extensions are not compatible with KHR_materials_unlit or KHR_materials_pbrSpecularGlossiness
-            if (!m->pbrSpecularGlossiness.isPresent) {
-                // Sheen
-                MaterialSheen sheen;
-                if (GetMatSheen(mat, sheen)) {
-                    mAsset->extensionsUsed.KHR_materials_sheen = true;
-                    m->materialSheen = Nullable<MaterialSheen>(sheen);
-                }
-
-                MaterialClearcoat clearcoat;
-                if (GetMatClearcoat(mat, clearcoat)) {
-                    mAsset->extensionsUsed.KHR_materials_clearcoat = true;
-                    m->materialClearcoat = Nullable<MaterialClearcoat>(clearcoat);
-                }
-
-                MaterialTransmission transmission;
-                if (GetMatTransmission(mat, transmission)) {
-                    mAsset->extensionsUsed.KHR_materials_transmission = true;
-                    m->materialTransmission = Nullable<MaterialTransmission>(transmission);
-                }
-                
-                MaterialVolume volume;
-                if (GetMatVolume(mat, volume)) {
-                    mAsset->extensionsUsed.KHR_materials_volume = true;
-                    m->materialVolume = Nullable<MaterialVolume>(volume);
-                }
-                                
-                MaterialIOR ior;
-                if (GetMatIOR(mat, ior)) {
-                    mAsset->extensionsUsed.KHR_materials_ior = true;
-                    m->materialIOR = Nullable<MaterialIOR>(ior);
-                }
-            }
-        }
-    }
-}
-
-/*
- * Search through node hierarchy and find the node containing the given meshID.
- * Returns true on success, and false otherwise.
- */
-bool FindMeshNode(Ref<Node> &nodeIn, Ref<Node> &meshNode, const std::string &meshID) {
-    for (unsigned int i = 0; i < nodeIn->meshes.size(); ++i) {
-        if (meshID.compare(nodeIn->meshes[i]->id) == 0) {
-            meshNode = nodeIn;
-            return true;
-        }
-    }
-
-    for (unsigned int i = 0; i < nodeIn->children.size(); ++i) {
-        if (FindMeshNode(nodeIn->children[i], meshNode, meshID)) {
-            return true;
-        }
-    }
-
-    return false;
-}
-
-/*
- * Find the root joint of the skeleton.
- * Starts will any joint node and traces up the tree,
- * until a parent is found that does not have a jointName.
- * Returns the first parent Ref<Node> found that does not have a jointName.
- */
-Ref<Node> FindSkeletonRootJoint(Ref<Skin> &skinRef) {
-    Ref<Node> startNodeRef;
-    Ref<Node> parentNodeRef;
-
-    // Arbitrarily use the first joint to start the search.
-    startNodeRef = skinRef->jointNames[0];
-    parentNodeRef = skinRef->jointNames[0];
-
-    do {
-        startNodeRef = parentNodeRef;
-        parentNodeRef = startNodeRef->parent;
-    } while (!parentNodeRef->jointName.empty());
-
-    return parentNodeRef;
-}
-
-void ExportSkin(Asset &mAsset, const aiMesh *aimesh, Ref<Mesh> &meshRef, Ref<Buffer> &bufferRef, Ref<Skin> &skinRef, 
-        std::vector<aiMatrix4x4> &inverseBindMatricesData) {
-    if (aimesh->mNumBones < 1) {
-        return;
-    }
-
-    // Store the vertex joint and weight data.
-    const size_t NumVerts(aimesh->mNumVertices);
-    vec4 *vertexJointData = new vec4[NumVerts];
-    vec4 *vertexWeightData = new vec4[NumVerts];
-    int *jointsPerVertex = new int[NumVerts];
-    for (size_t i = 0; i < NumVerts; ++i) {
-        jointsPerVertex[i] = 0;
-        for (size_t j = 0; j < 4; ++j) {
-            vertexJointData[i][j] = 0;
-            vertexWeightData[i][j] = 0;
-        }
-    }
-
-    for (unsigned int idx_bone = 0; idx_bone < aimesh->mNumBones; ++idx_bone) {
-        const aiBone *aib = aimesh->mBones[idx_bone];
-
-        // aib->mName   =====>  skinRef->jointNames
-        // Find the node with id = mName.
-        Ref<Node> nodeRef = mAsset.nodes.Get(aib->mName.C_Str());
-        nodeRef->jointName = nodeRef->name;
-
-        unsigned int jointNamesIndex = 0;
-        bool addJointToJointNames = true;
-        for (unsigned int idx_joint = 0; idx_joint < skinRef->jointNames.size(); ++idx_joint) {
-            if (skinRef->jointNames[idx_joint]->jointName.compare(nodeRef->jointName) == 0) {
-                addJointToJointNames = false;
-                jointNamesIndex = idx_joint;
-            }
-        }
-
-        if (addJointToJointNames) {
-            skinRef->jointNames.push_back(nodeRef);
-
-            // aib->mOffsetMatrix   =====>  skinRef->inverseBindMatrices
-            aiMatrix4x4 tmpMatrix4;
-            CopyValue(aib->mOffsetMatrix, tmpMatrix4);
-            inverseBindMatricesData.push_back(tmpMatrix4);
-            jointNamesIndex = static_cast<unsigned int>(inverseBindMatricesData.size() - 1);
-        }
-
-        // aib->mWeights   =====>  vertexWeightData
-        for (unsigned int idx_weights = 0; idx_weights < aib->mNumWeights; ++idx_weights) {
-            unsigned int vertexId = aib->mWeights[idx_weights].mVertexId;
-            float vertWeight = aib->mWeights[idx_weights].mWeight;
-
-            // A vertex can only have at most four joint weights, which ideally sum up to 1
-            if (IsBoneWeightFitted(vertexWeightData[vertexId])) {
-                continue;
-            }
-            if (jointsPerVertex[vertexId] > 3) {
-                int boneIndexFitted = FitBoneWeight(vertexWeightData[vertexId], vertWeight);
-                if (boneIndexFitted != -1) {
-                    vertexJointData[vertexId][boneIndexFitted] = static_cast<float>(jointNamesIndex);
-                }
-            }else {
-                vertexJointData[vertexId][jointsPerVertex[vertexId]] = static_cast<float>(jointNamesIndex);
-                vertexWeightData[vertexId][jointsPerVertex[vertexId]] = vertWeight;
-
-                jointsPerVertex[vertexId] += 1;   
-            }
-        }
-
-    } // End: for-loop mNumMeshes
-
-    Mesh::Primitive &p = meshRef->primitives.back();
-    Ref<Accessor> vertexJointAccessor = ExportData(mAsset, skinRef->id, bufferRef, aimesh->mNumVertices, 
-        vertexJointData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
-    if (vertexJointAccessor) {
-        size_t offset = vertexJointAccessor->bufferView->byteOffset;
-        size_t bytesLen = vertexJointAccessor->bufferView->byteLength;
-        unsigned int s_bytesPerComp = ComponentTypeSize(ComponentType_UNSIGNED_SHORT);
-        unsigned int bytesPerComp = ComponentTypeSize(vertexJointAccessor->componentType);
-        size_t s_bytesLen = bytesLen * s_bytesPerComp / bytesPerComp;
-        Ref<Buffer> buf = vertexJointAccessor->bufferView->buffer;
-        uint8_t *arrys = new uint8_t[bytesLen];
-        unsigned int i = 0;
-        for (unsigned int j = 0; j < bytesLen; j += bytesPerComp) {
-            size_t len_p = offset + j;
-            float f_value = *(float *)&buf->GetPointer()[len_p];
-            unsigned short c = static_cast<unsigned short>(f_value);
-            memcpy(&arrys[i * s_bytesPerComp], &c, s_bytesPerComp);
-            ++i;
-        }
-        buf->ReplaceData_joint(offset, bytesLen, arrys, bytesLen);
-        vertexJointAccessor->componentType = ComponentType_UNSIGNED_SHORT;
-        vertexJointAccessor->bufferView->byteLength = s_bytesLen;
-
-        p.attributes.joint.push_back(vertexJointAccessor);
-        delete[] arrys;
-    }
-
-    Ref<Accessor> vertexWeightAccessor = ExportData(mAsset, skinRef->id, bufferRef, aimesh->mNumVertices,
-            vertexWeightData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
-    if (vertexWeightAccessor) {
-        p.attributes.weight.push_back(vertexWeightAccessor);
-    }
-    delete[] jointsPerVertex;
-    delete[] vertexWeightData;
-    delete[] vertexJointData;
-}
-
-void glTF2Exporter::ExportMeshes() {
-    typedef decltype(aiFace::mNumIndices) IndicesType;
-
-    std::string fname = std::string(mFilename);
-    std::string bufferIdPrefix = fname.substr(0, fname.rfind(".gltf"));
-    std::string bufferId = mAsset->FindUniqueID("", bufferIdPrefix.c_str());
-
-    Ref<Buffer> b = mAsset->GetBodyBuffer();
-    if (!b) {
-        b = mAsset->buffers.Create(bufferId);
-    }
-
-    //----------------------------------------
-    // Initialize variables for the skin
-    bool createSkin = false;
-    for (unsigned int idx_mesh = 0; idx_mesh < mScene->mNumMeshes; ++idx_mesh) {
-        const aiMesh *aim = mScene->mMeshes[idx_mesh];
-        if (aim->HasBones()) {
-            createSkin = true;
-            break;
-        }
-    }
-
-    Ref<Skin> skinRef;
-    std::string skinName = mAsset->FindUniqueID("skin", "skin");
-    std::vector<aiMatrix4x4> inverseBindMatricesData;
-    if (createSkin) {
-        skinRef = mAsset->skins.Create(skinName);
-        skinRef->name = skinName;
-    }
-    //----------------------------------------
-
-    for (unsigned int idx_mesh = 0; idx_mesh < mScene->mNumMeshes; ++idx_mesh) {
-        const aiMesh *aim = mScene->mMeshes[idx_mesh];
-
-        std::string name = aim->mName.C_Str();
-
-        std::string meshId = mAsset->FindUniqueID(name, "mesh");
-        Ref<Mesh> m = mAsset->meshes.Create(meshId);
-        m->primitives.resize(1);
-        Mesh::Primitive &p = m->primitives.back();
-
-        m->name = name;
-
-        p.material = mAsset->materials.Get(aim->mMaterialIndex);
-        p.ngonEncoded = (aim->mPrimitiveTypes & aiPrimitiveType_NGONEncodingFlag) != 0;
-
-        /******************* Vertices ********************/
-        Ref<Accessor> v = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mVertices, AttribType::VEC3,
-            AttribType::VEC3, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-        if (v) {
-            p.attributes.position.push_back(v);
-        }
-
-        /******************** Normals ********************/
-        // Normalize all normals as the validator can emit a warning otherwise
-        if (nullptr != aim->mNormals) {
-            for (auto i = 0u; i < aim->mNumVertices; ++i) {
-                aim->mNormals[i].NormalizeSafe();
-            }
-        }
-
-        Ref<Accessor> n = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mNormals, AttribType::VEC3, 
-            AttribType::VEC3, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-        if (n) {
-            p.attributes.normal.push_back(n);
-        }
-
-        /************** Texture coordinates **************/
-        for (int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-            if (!aim->HasTextureCoords(i)) {
-                continue;
-            }
-
-            // Flip UV y coords
-            if (aim->mNumUVComponents[i] > 1) {
-                for (unsigned int j = 0; j < aim->mNumVertices; ++j) {
-                    aim->mTextureCoords[i][j].y = 1 - aim->mTextureCoords[i][j].y;
-                }
-            }
-
-            if (aim->mNumUVComponents[i] > 0) {
-                AttribType::Value type = (aim->mNumUVComponents[i] == 2) ? AttribType::VEC2 : AttribType::VEC3;
-
-                Ref<Accessor> tc = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mTextureCoords[i], 
-                    AttribType::VEC3, type, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-                if (tc) {
-                    p.attributes.texcoord.push_back(tc);
-                }
-            }
-        }
-
-        /*************** Vertex colors ****************/
-        for (unsigned int indexColorChannel = 0; indexColorChannel < aim->GetNumColorChannels(); ++indexColorChannel) {
-            Ref<Accessor> c = ExportData(*mAsset, meshId, b, aim->mNumVertices, aim->mColors[indexColorChannel],
-                AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT, BufferViewTarget_ARRAY_BUFFER);
-            if (c) {
-                p.attributes.color.push_back(c);
-            }
-        }
-
-        /*************** Vertices indices ****************/
-        if (aim->mNumFaces > 0) {
-            std::vector<IndicesType> indices;
-            unsigned int nIndicesPerFace = aim->mFaces[0].mNumIndices;
-            indices.resize(aim->mNumFaces * nIndicesPerFace);
-            for (size_t i = 0; i < aim->mNumFaces; ++i) {
-                for (size_t j = 0; j < nIndicesPerFace; ++j) {
-                    indices[i * nIndicesPerFace + j] = IndicesType(aim->mFaces[i].mIndices[j]);
-                }
-            }
-
-            p.indices = ExportData(*mAsset, meshId, b, indices.size(), &indices[0], AttribType::SCALAR, AttribType::SCALAR, 
-                ComponentType_UNSIGNED_INT, BufferViewTarget_ELEMENT_ARRAY_BUFFER);
-        }
-
-        switch (aim->mPrimitiveTypes) {
-        case aiPrimitiveType_POLYGON:
-            p.mode = PrimitiveMode_TRIANGLES;
-            break; // TODO implement this
-        case aiPrimitiveType_LINE:
-            p.mode = PrimitiveMode_LINES;
-            break;
-        case aiPrimitiveType_POINT:
-            p.mode = PrimitiveMode_POINTS;
-            break;
-        default: // aiPrimitiveType_TRIANGLE
-            p.mode = PrimitiveMode_TRIANGLES;
-            break;
-        }
-
-        /*************** Skins ****************/
-        if (aim->HasBones()) {
-            ExportSkin(*mAsset, aim, m, b, skinRef, inverseBindMatricesData);
-        }
-
-        /*************** Targets for blendshapes ****************/
-        if (aim->mNumAnimMeshes > 0) {
-            bool bUseSparse = this->mProperties->HasPropertyBool("GLTF2_SPARSE_ACCESSOR_EXP") &&
-                              this->mProperties->GetPropertyBool("GLTF2_SPARSE_ACCESSOR_EXP");
-            bool bIncludeNormal = this->mProperties->HasPropertyBool("GLTF2_TARGET_NORMAL_EXP") &&
-                                  this->mProperties->GetPropertyBool("GLTF2_TARGET_NORMAL_EXP");
-            bool bExportTargetNames = this->mProperties->HasPropertyBool("GLTF2_TARGETNAMES_EXP") &&
-                                      this->mProperties->GetPropertyBool("GLTF2_TARGETNAMES_EXP");
-
-            p.targets.resize(aim->mNumAnimMeshes);
-            for (unsigned int am = 0; am < aim->mNumAnimMeshes; ++am) {
-                aiAnimMesh *pAnimMesh = aim->mAnimMeshes[am];
-                if (bExportTargetNames) {
-                    m->targetNames.emplace_back(pAnimMesh->mName.data);
-                }
-                // position
-                if (pAnimMesh->HasPositions()) {
-                    // NOTE: in gltf it is the diff stored
-                    aiVector3D *pPositionDiff = new aiVector3D[pAnimMesh->mNumVertices];
-                    for (unsigned int vt = 0; vt < pAnimMesh->mNumVertices; ++vt) {
-                        pPositionDiff[vt] = pAnimMesh->mVertices[vt] - aim->mVertices[vt];
-                    }
-                    Ref<Accessor> vec;
-                    if (bUseSparse) {
-                        vec = ExportDataSparse(*mAsset, meshId, b,
-                                pAnimMesh->mNumVertices, pPositionDiff,
-                                AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-                    } else {
-                        vec = ExportData(*mAsset, meshId, b,
-                                pAnimMesh->mNumVertices, pPositionDiff,
-                                AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-                    }
-                    if (vec) {
-                        p.targets[am].position.push_back(vec);
-                    }
-                    delete[] pPositionDiff;
-                }
-
-                // normal
-                if (pAnimMesh->HasNormals() && bIncludeNormal) {
-                    aiVector3D *pNormalDiff = new aiVector3D[pAnimMesh->mNumVertices];
-                    for (unsigned int vt = 0; vt < pAnimMesh->mNumVertices; ++vt) {
-                        pNormalDiff[vt] = pAnimMesh->mNormals[vt] - aim->mNormals[vt];
-                    }
-                    Ref<Accessor> vec;
-                    if (bUseSparse) {
-                        vec = ExportDataSparse(*mAsset, meshId, b,
-                                pAnimMesh->mNumVertices, pNormalDiff,
-                                AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-                    } else {
-                        vec = ExportData(*mAsset, meshId, b,
-                                pAnimMesh->mNumVertices, pNormalDiff,
-                                AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-                    }
-                    if (vec) {
-                        p.targets[am].normal.push_back(vec);
-                    }
-                    delete[] pNormalDiff;
-                }
-
-                // tangent?
-            }
-        }
-    }
-
-    //----------------------------------------
-    // Finish the skin
-    // Create the Accessor for skinRef->inverseBindMatrices
-    bool bAddCustomizedProperty = this->mProperties->HasPropertyBool("GLTF2_CUSTOMIZE_PROPERTY");
-    if (createSkin) {
-        mat4 *invBindMatrixData = new mat4[inverseBindMatricesData.size()];
-        for (unsigned int idx_joint = 0; idx_joint < inverseBindMatricesData.size(); ++idx_joint) {
-            CopyValue(inverseBindMatricesData[idx_joint], invBindMatrixData[idx_joint]);
-        }
-
-        Ref<Accessor> invBindMatrixAccessor = ExportData(*mAsset, skinName, b,
-                static_cast<unsigned int>(inverseBindMatricesData.size()),
-                invBindMatrixData, AttribType::MAT4, AttribType::MAT4, ComponentType_FLOAT);
-        if (invBindMatrixAccessor) {
-            skinRef->inverseBindMatrices = invBindMatrixAccessor;
-        }
-
-        // Identity Matrix   =====>  skinRef->bindShapeMatrix
-        // Temporary. Hard-coded identity matrix here
-        skinRef->bindShapeMatrix.isPresent = bAddCustomizedProperty;
-        IdentityMatrix4(skinRef->bindShapeMatrix.value);
-
-        // Find nodes that contain a mesh with bones and add "skeletons" and "skin" attributes to those nodes.
-        Ref<Node> rootNode = mAsset->nodes.Get(unsigned(0));
-        Ref<Node> meshNode;
-        for (unsigned int meshIndex = 0; meshIndex < mAsset->meshes.Size(); ++meshIndex) {
-            Ref<Mesh> mesh = mAsset->meshes.Get(meshIndex);
-            bool hasBones = false;
-            for (unsigned int i = 0; i < mesh->primitives.size(); ++i) {
-                if (!mesh->primitives[i].attributes.weight.empty()) {
-                    hasBones = true;
-                    break;
-                }
-            }
-            if (!hasBones) {
-                continue;
-            }
-            std::string meshID = mesh->id;
-            FindMeshNode(rootNode, meshNode, meshID);
-            Ref<Node> rootJoint = FindSkeletonRootJoint(skinRef);
-            if (bAddCustomizedProperty)
-                meshNode->skeletons.push_back(rootJoint);
-            meshNode->skin = skinRef;
-        }
-        delete[] invBindMatrixData;
-    }
-}
-
-// Merges a node's multiple meshes (with one primitive each) into one mesh with multiple primitives
-void glTF2Exporter::MergeMeshes() {
-    for (unsigned int n = 0; n < mAsset->nodes.Size(); ++n) {
-        Ref<Node> node = mAsset->nodes.Get(n);
-
-        unsigned int nMeshes = static_cast<unsigned int>(node->meshes.size());
-
-        //skip if it's 1 or less meshes per node
-        if (nMeshes > 1) {
-            Ref<Mesh> firstMesh = node->meshes.at(0);
-
-            //loop backwards to allow easy removal of a mesh from a node once it's merged
-            for (unsigned int m = nMeshes - 1; m >= 1; --m) {
-                Ref<Mesh> mesh = node->meshes.at(m);
-
-                //append this mesh's primitives to the first mesh's primitives
-                firstMesh->primitives.insert(
-                        firstMesh->primitives.end(),
-                        mesh->primitives.begin(),
-                        mesh->primitives.end());
-
-                //remove the mesh from the list of meshes
-                unsigned int removedIndex = mAsset->meshes.Remove(mesh->id.c_str());
-
-                //find the presence of the removed mesh in other nodes
-                for (unsigned int nn = 0; nn < mAsset->nodes.Size(); ++nn) {
-                    Ref<Node> curNode = mAsset->nodes.Get(nn);
-
-                    for (unsigned int mm = 0; mm < curNode->meshes.size(); ++mm) {
-                        Ref<Mesh> &meshRef = curNode->meshes.at(mm);
-                        unsigned int meshIndex = meshRef.GetIndex();
-
-                        if (meshIndex == removedIndex) {
-                            curNode->meshes.erase(curNode->meshes.begin() + mm);
-                        } else if (meshIndex > removedIndex) {
-                            Ref<Mesh> newMeshRef = mAsset->meshes.Get(meshIndex - 1);
-
-                            meshRef = newMeshRef;
-                        }
-                    }
-                }
-            }
-
-            //since we were looping backwards, reverse the order of merged primitives to their original order
-            std::reverse(firstMesh->primitives.begin() + 1, firstMesh->primitives.end());
-        }
-    }
-}
-
-/*
- * Export the root node of the node hierarchy.
- * Calls ExportNode for all children.
- */
-unsigned int glTF2Exporter::ExportNodeHierarchy(const aiNode *n) {
-    Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node"));
-
-    node->name = n->mName.C_Str();
-
-    if (!n->mTransformation.IsIdentity()) {
-        node->matrix.isPresent = true;
-        CopyValue(n->mTransformation, node->matrix.value);
-    }
-
-    for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
-        node->meshes.emplace_back(mAsset->meshes.Get(n->mMeshes[i]));
-    }
-
-    for (unsigned int i = 0; i < n->mNumChildren; ++i) {
-        unsigned int idx = ExportNode(n->mChildren[i], node);
-        node->children.emplace_back(mAsset->nodes.Get(idx));
-    }
-
-    return node.GetIndex();
-}
-
-/*
- * Export node and recursively calls ExportNode for all children.
- * Since these nodes are not the root node, we also export the parent Ref<Node>
- */
-unsigned int glTF2Exporter::ExportNode(const aiNode *n, Ref<Node> &parent) {
-    std::string name = mAsset->FindUniqueID(n->mName.C_Str(), "node");
-    Ref<Node> node = mAsset->nodes.Create(name);
-
-    node->parent = parent;
-    node->name = name;
-
-    if (!n->mTransformation.IsIdentity()) {
-        if (mScene->mNumAnimations > 0 || (mProperties && mProperties->HasPropertyBool("GLTF2_NODE_IN_TRS"))) {
-            aiQuaternion quaternion;
-            n->mTransformation.Decompose(*reinterpret_cast<aiVector3D *>(&node->scale.value), quaternion, *reinterpret_cast<aiVector3D *>(&node->translation.value));
-
-            aiVector3D vector(static_cast<ai_real>(1.0f), static_cast<ai_real>(1.0f), static_cast<ai_real>(1.0f));
-            if (!reinterpret_cast<aiVector3D *>(&node->scale.value)->Equal(vector)) {
-                node->scale.isPresent = true;
-            }
-            if (!reinterpret_cast<aiVector3D *>(&node->translation.value)->Equal(vector)) {
-                node->translation.isPresent = true;
-            }
-            node->rotation.isPresent = true;
-            node->rotation.value[0] = quaternion.x;
-            node->rotation.value[1] = quaternion.y;
-            node->rotation.value[2] = quaternion.z;
-            node->rotation.value[3] = quaternion.w;
-            node->matrix.isPresent = false;
-        } else {
-            node->matrix.isPresent = true;
-            CopyValue(n->mTransformation, node->matrix.value);
-        }
-    }
-
-    for (unsigned int i = 0; i < n->mNumMeshes; ++i) {
-        node->meshes.emplace_back(mAsset->meshes.Get(n->mMeshes[i]));
-    }
-
-    for (unsigned int i = 0; i < n->mNumChildren; ++i) {
-        unsigned int idx = ExportNode(n->mChildren[i], node);
-        node->children.emplace_back(mAsset->nodes.Get(idx));
-    }
-
-    return node.GetIndex();
-}
-
-void glTF2Exporter::ExportScene() {
-    // Use the name of the scene if specified
-    const std::string sceneName = (mScene->mName.length > 0) ? mScene->mName.C_Str() : "defaultScene";
-
-    // Ensure unique
-    Ref<Scene> scene = mAsset->scenes.Create(mAsset->FindUniqueID(sceneName, ""));
-
-    // root node will be the first one exported (idx 0)
-    if (mAsset->nodes.Size() > 0) {
-        scene->nodes.emplace_back(mAsset->nodes.Get(0u));
-    }
-
-    // set as the default scene
-    mAsset->scene = scene;
-}
-
-void glTF2Exporter::ExportMetadata() {
-    AssetMetadata &asset = mAsset->asset;
-    asset.version = "2.0";
-
-    char buffer[256];
-    ai_snprintf(buffer, 256, "Open Asset Import Library (assimp v%d.%d.%x)",
-            aiGetVersionMajor(), aiGetVersionMinor(), aiGetVersionRevision());
-
-    asset.generator = buffer;
-
-    // Copyright
-    aiString copyright_str;
-    if (mScene->mMetaData != nullptr && mScene->mMetaData->Get(AI_METADATA_SOURCE_COPYRIGHT, copyright_str)) {
-        asset.copyright = copyright_str.C_Str();
-    }
-}
-
-inline Ref<Accessor> GetSamplerInputRef(Asset &asset, std::string &animId, Ref<Buffer> &buffer, std::vector<ai_real> &times) {
-    return ExportData(asset, animId, buffer, (unsigned int)times.size(), &times[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_FLOAT);
-}
-
-inline void ExtractTranslationSampler(Asset &asset, std::string &animId, Ref<Buffer> &buffer, const aiNodeAnim *nodeChannel, float ticksPerSecond, Animation::Sampler &sampler) {
-    const unsigned int numKeyframes = nodeChannel->mNumPositionKeys;
-
-    std::vector<ai_real> times(numKeyframes);
-    std::vector<ai_real> values(numKeyframes * 3);
-    for (unsigned int i = 0; i < numKeyframes; ++i) {
-        const aiVectorKey &key = nodeChannel->mPositionKeys[i];
-        // mTime is measured in ticks, but GLTF time is measured in seconds, so convert.
-        times[i] = static_cast<float>(key.mTime / ticksPerSecond);
-        values[(i * 3) + 0] = (ai_real) key.mValue.x;
-        values[(i * 3) + 1] = (ai_real) key.mValue.y;
-        values[(i * 3) + 2] = (ai_real) key.mValue.z;
-    }
-
-    sampler.input = GetSamplerInputRef(asset, animId, buffer, times);
-    sampler.output = ExportData(asset, animId, buffer, numKeyframes, &values[0], AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-    sampler.interpolation = Interpolation_LINEAR;
-}
-
-inline void ExtractScaleSampler(Asset &asset, std::string &animId, Ref<Buffer> &buffer, const aiNodeAnim *nodeChannel, float ticksPerSecond, Animation::Sampler &sampler) {
-    const unsigned int numKeyframes = nodeChannel->mNumScalingKeys;
-
-    std::vector<ai_real> times(numKeyframes);
-    std::vector<ai_real> values(numKeyframes * 3);
-    for (unsigned int i = 0; i < numKeyframes; ++i) {
-        const aiVectorKey &key = nodeChannel->mScalingKeys[i];
-        // mTime is measured in ticks, but GLTF time is measured in seconds, so convert.
-        times[i] = static_cast<float>(key.mTime / ticksPerSecond);
-        values[(i * 3) + 0] = (ai_real) key.mValue.x;
-        values[(i * 3) + 1] = (ai_real) key.mValue.y;
-        values[(i * 3) + 2] = (ai_real) key.mValue.z;
-    }
-
-    sampler.input = GetSamplerInputRef(asset, animId, buffer, times);
-    sampler.output = ExportData(asset, animId, buffer, numKeyframes, &values[0], AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
-    sampler.interpolation = Interpolation_LINEAR;
-}
-
-inline void ExtractRotationSampler(Asset &asset, std::string &animId, Ref<Buffer> &buffer, const aiNodeAnim *nodeChannel, float ticksPerSecond, Animation::Sampler &sampler) {
-    const unsigned int numKeyframes = nodeChannel->mNumRotationKeys;
-
-    std::vector<ai_real> times(numKeyframes);
-    std::vector<ai_real> values(numKeyframes * 4);
-    for (unsigned int i = 0; i < numKeyframes; ++i) {
-        const aiQuatKey &key = nodeChannel->mRotationKeys[i];
-        // mTime is measured in ticks, but GLTF time is measured in seconds, so convert.
-        times[i] = static_cast<float>(key.mTime / ticksPerSecond);
-        values[(i * 4) + 0] = (ai_real) key.mValue.x;
-        values[(i * 4) + 1] = (ai_real) key.mValue.y;
-        values[(i * 4) + 2] = (ai_real) key.mValue.z;
-        values[(i * 4) + 3] = (ai_real) key.mValue.w;
-    }
-
-    sampler.input = GetSamplerInputRef(asset, animId, buffer, times);
-    sampler.output = ExportData(asset, animId, buffer, numKeyframes, &values[0], AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
-    sampler.interpolation = Interpolation_LINEAR;
-}
-
-static void AddSampler(Ref<Animation> &animRef, Ref<Node> &nodeRef, Animation::Sampler &sampler, AnimationPath path) {
-    Animation::Channel channel;
-    channel.sampler = static_cast<int>(animRef->samplers.size());
-    channel.target.path = path;
-    channel.target.node = nodeRef;
-    animRef->channels.push_back(channel);
-    animRef->samplers.push_back(sampler);
-}
-
-void glTF2Exporter::ExportAnimations() {
-    Ref<Buffer> bufferRef = mAsset->buffers.Get(unsigned(0));
-
-    for (unsigned int i = 0; i < mScene->mNumAnimations; ++i) {
-        const aiAnimation *anim = mScene->mAnimations[i];
-        const float ticksPerSecond = static_cast<float>(anim->mTicksPerSecond);
-
-        std::string nameAnim = "anim";
-        if (anim->mName.length > 0) {
-            nameAnim = anim->mName.C_Str();
-        }
-        Ref<Animation> animRef = mAsset->animations.Create(nameAnim);
-        animRef->name = nameAnim;
-
-        for (unsigned int channelIndex = 0; channelIndex < anim->mNumChannels; ++channelIndex) {
-            const aiNodeAnim *nodeChannel = anim->mChannels[channelIndex];
-
-            std::string name = nameAnim + "_" + ai_to_string(channelIndex);
-            name = mAsset->FindUniqueID(name, "animation");
-
-            Ref<Node> animNode = mAsset->nodes.Get(nodeChannel->mNodeName.C_Str());
-
-            if (nodeChannel->mNumPositionKeys > 0) {
-                Animation::Sampler translationSampler;
-                ExtractTranslationSampler(*mAsset, name, bufferRef, nodeChannel, ticksPerSecond, translationSampler);
-                AddSampler(animRef, animNode, translationSampler, AnimationPath_TRANSLATION);
-            }
-
-            if (nodeChannel->mNumRotationKeys > 0) {
-                Animation::Sampler rotationSampler;
-                ExtractRotationSampler(*mAsset, name, bufferRef, nodeChannel, ticksPerSecond, rotationSampler);
-                AddSampler(animRef, animNode, rotationSampler, AnimationPath_ROTATION);
-            }
-
-            if (nodeChannel->mNumScalingKeys > 0) {
-                Animation::Sampler scaleSampler;
-                ExtractScaleSampler(*mAsset, name, bufferRef, nodeChannel, ticksPerSecond, scaleSampler);
-                AddSampler(animRef, animNode, scaleSampler, AnimationPath_SCALE);
-            }
-        }
-    } // End: for-loop mNumAnimations
-}
-
-#endif // ASSIMP_BUILD_NO_GLTF_EXPORTER
-#endif // ASSIMP_BUILD_NO_EXPORT