move 3rd-party librarys into libs/ and add built-in honeysuckle

10 files changed, 5779 insertions, 0 deletions

diff --git a/libs/assimp/code/AssetLib/glTF/glTFAsset.h b/libs/assimp/code/AssetLib/glTF/glTFAsset.h
new file mode 100644
index 0000000..1a42e90
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFAsset.h
@@ -0,0 +1,1017 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+/** @file glTFAsset.h
+ * Declares a glTF class to handle gltf/glb files
+ *
+ * glTF Extensions Support:
+ *   KHR_binary_glTF: full
+ *   KHR_materials_common: full
+ */
+#ifndef GLTFASSET_H_INC
+#define GLTFASSET_H_INC
+
+#if !defined(ASSIMP_BUILD_NO_GLTF_IMPORTER) && !defined(ASSIMP_BUILD_NO_GLTF1_IMPORTER)
+
+#include "glTFCommon.h"
+#include <assimp/Exceptional.h>
+#include <algorithm>
+#include <list>
+#include <map>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+// clang-format off
+
+#if (__GNUC__ == 8 && __GNUC_MINOR__ >= 0)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
+
+#include <rapidjson/rapidjson.h>
+#include <rapidjson/document.h>
+#include <rapidjson/error/en.h>
+
+#if (__GNUC__ == 8 && __GNUC_MINOR__ >= 0)
+#pragma GCC diagnostic pop
+#endif
+
+#ifdef ASSIMP_API
+#   include <memory>
+#   include <assimp/DefaultIOSystem.h>
+#   include <assimp/ByteSwapper.h>
+#else
+#   include <memory>
+#   define AI_SWAP4(p)
+#   define ai_assert
+#endif
+
+
+#if _MSC_VER > 1500 || (defined __GNUC___)
+#       define ASSIMP_GLTF_USE_UNORDERED_MULTIMAP
+#   else
+#       define gltf_unordered_map map
+#endif
+
+#ifdef ASSIMP_GLTF_USE_UNORDERED_MULTIMAP
+#   include <unordered_map>
+#   if defined(_MSC_VER) && _MSC_VER <= 1600
+#       define gltf_unordered_map tr1::unordered_map
+#   else
+#       define gltf_unordered_map unordered_map
+#   endif
+#endif
+
+// clang-format on
+
+#include "AssetLib/glTF/glTFCommon.h"
+
+namespace glTF {
+
+using glTFCommon::IOStream;
+using glTFCommon::IOSystem;
+using glTFCommon::Nullable;
+using glTFCommon::Ref;
+using glTFCommon::shared_ptr;
+
+using rapidjson::Document;
+using rapidjson::Value;
+
+class Asset;
+class AssetWriter;
+
+struct BufferView; // here due to cross-reference
+struct Texture;
+struct Light;
+struct Skin;
+
+using glTFCommon::mat4;
+using glTFCommon::vec3;
+using glTFCommon::vec4;
+
+//! Magic number for GLB files
+#define AI_GLB_MAGIC_NUMBER "glTF"
+
+// clang-format off
+#ifdef ASSIMP_API
+#   include <assimp/Compiler/pushpack1.h>
+#endif
+// clang-format on
+
+//! For the KHR_binary_glTF extension (binary .glb file)
+//! 20-byte header (+ the JSON + a "body" data section)
+struct GLB_Header {
+    uint8_t magic[4]; //!< Magic number: "glTF"
+    uint32_t version; //!< Version number (always 1 as of the last update)
+    uint32_t length; //!< Total length of the Binary glTF, including header, scene, and body, in bytes
+    uint32_t sceneLength; //!< Length, in bytes, of the glTF scene
+    uint32_t sceneFormat; //!< Specifies the format of the glTF scene (see the SceneFormat enum)
+} PACK_STRUCT;
+
+// clang-format off
+#ifdef ASSIMP_API
+#   include <assimp/Compiler/poppack1.h>
+#endif
+// clang-format on
+
+//! Values for the GLB_Header::sceneFormat field
+enum SceneFormat {
+    SceneFormat_JSON = 0
+};
+
+//! Values for the mesh primitive modes
+enum PrimitiveMode {
+    PrimitiveMode_POINTS = 0,
+    PrimitiveMode_LINES = 1,
+    PrimitiveMode_LINE_LOOP = 2,
+    PrimitiveMode_LINE_STRIP = 3,
+    PrimitiveMode_TRIANGLES = 4,
+    PrimitiveMode_TRIANGLE_STRIP = 5,
+    PrimitiveMode_TRIANGLE_FAN = 6
+};
+
+//! Values for the Accessor::componentType field
+enum ComponentType {
+    ComponentType_BYTE = 5120,
+    ComponentType_UNSIGNED_BYTE = 5121,
+    ComponentType_SHORT = 5122,
+    ComponentType_UNSIGNED_SHORT = 5123,
+    ComponentType_UNSIGNED_INT = 5125,
+    ComponentType_FLOAT = 5126
+};
+
+inline unsigned int ComponentTypeSize(ComponentType t) {
+    switch (t) {
+    case ComponentType_SHORT:
+    case ComponentType_UNSIGNED_SHORT:
+        return 2;
+
+    case ComponentType_UNSIGNED_INT:
+    case ComponentType_FLOAT:
+        return 4;
+
+    case ComponentType_BYTE:
+    case ComponentType_UNSIGNED_BYTE:
+        return 1;
+    default:
+        std::string err = "GLTF: Unsupported Component Type ";
+        err += std::to_string(t);
+        throw DeadlyImportError(err);
+    }
+}
+
+//! Values for the BufferView::target field
+enum BufferViewTarget {
+    BufferViewTarget_NONE = 0,
+    BufferViewTarget_ARRAY_BUFFER = 34962,
+    BufferViewTarget_ELEMENT_ARRAY_BUFFER = 34963
+};
+
+//! Values for the Sampler::magFilter field
+enum SamplerMagFilter {
+    SamplerMagFilter_Nearest = 9728,
+    SamplerMagFilter_Linear = 9729
+};
+
+//! Values for the Sampler::minFilter field
+enum SamplerMinFilter {
+    SamplerMinFilter_Nearest = 9728,
+    SamplerMinFilter_Linear = 9729,
+    SamplerMinFilter_Nearest_Mipmap_Nearest = 9984,
+    SamplerMinFilter_Linear_Mipmap_Nearest = 9985,
+    SamplerMinFilter_Nearest_Mipmap_Linear = 9986,
+    SamplerMinFilter_Linear_Mipmap_Linear = 9987
+};
+
+//! Values for the Sampler::wrapS and Sampler::wrapT field
+enum SamplerWrap {
+    SamplerWrap_Clamp_To_Edge = 33071,
+    SamplerWrap_Mirrored_Repeat = 33648,
+    SamplerWrap_Repeat = 10497
+};
+
+//! Values for the Texture::format and Texture::internalFormat fields
+enum TextureFormat {
+    TextureFormat_ALPHA = 6406,
+    TextureFormat_RGB = 6407,
+    TextureFormat_RGBA = 6408,
+    TextureFormat_LUMINANCE = 6409,
+    TextureFormat_LUMINANCE_ALPHA = 6410
+};
+
+//! Values for the Texture::target field
+enum TextureTarget {
+    TextureTarget_TEXTURE_2D = 3553
+};
+
+//! Values for the Texture::type field
+enum TextureType {
+    TextureType_UNSIGNED_BYTE = 5121,
+    TextureType_UNSIGNED_SHORT_5_6_5 = 33635,
+    TextureType_UNSIGNED_SHORT_4_4_4_4 = 32819,
+    TextureType_UNSIGNED_SHORT_5_5_5_1 = 32820
+};
+
+//! Values for the Accessor::type field (helper class)
+class AttribType {
+public:
+    enum Value { SCALAR,
+        VEC2,
+        VEC3,
+        VEC4,
+        MAT2,
+        MAT3,
+        MAT4 
+    };
+
+    inline static Value FromString(const char *str) {
+        for (size_t i = 0; i < NUM_VALUES; ++i) {
+            if (strcmp(data<0>::infos[i].name, str) == 0) {
+                return static_cast<Value>(i);
+            }
+        }
+        return SCALAR;
+    }
+
+    inline static const char *ToString(Value type) {
+        return data<0>::infos[static_cast<size_t>(type)].name;
+    }
+
+    inline static unsigned int GetNumComponents(Value type) {
+        return data<0>::infos[static_cast<size_t>(type)].numComponents;
+    }
+
+private:
+    static const size_t NUM_VALUES = static_cast<size_t>(MAT4) + 1;
+    struct Info {
+        const char *name;
+        unsigned int numComponents;
+    };
+
+    template <int N>
+    struct data { 
+        static const Info infos[NUM_VALUES]; 
+    };
+};
+
+// must match the order of the AttribTypeTraits::Value enum!
+template <int N>
+const AttribType::Info AttribType::data<N>::infos[AttribType::NUM_VALUES] = {
+    { "SCALAR", 1 },
+    { "VEC2", 2 }, 
+    { "VEC3", 3 }, 
+    { "VEC4", 4 }, 
+    { "MAT2", 4 }, 
+    { "MAT3", 9 }, 
+    { "MAT4", 16 }
+};
+
+//! Base class for all glTF top-level objects
+struct Object {
+    std::string id; //!< The globally unique ID used to reference this object
+    std::string name; //!< The user-defined name of this object
+
+    //! Objects marked as special are not exported (used to emulate the binary body buffer)
+    virtual bool IsSpecial() const { return false; }
+
+    Object() = default;
+    virtual ~Object() {}
+
+    //! Maps special IDs to another ID, where needed. Subclasses may override it (statically)
+    static const char *TranslateId(Asset & /*r*/, const char *id) { return id; }
+};
+
+//
+// Classes for each glTF top-level object type
+//
+
+//! A typed view into a BufferView. A BufferView contains raw binary data.
+//! An accessor provides a typed view into a BufferView or a subset of a BufferView
+//! similar to how WebGL's vertexAttribPointer() defines an attribute in a buffer.
+struct Accessor : public Object {
+    Ref<BufferView> bufferView; //!< The ID of the bufferView. (required)
+    unsigned int byteOffset; //!< The offset relative to the start of the bufferView in bytes. (required)
+    unsigned int byteStride; //!< The stride, in bytes, between attributes referenced by this accessor. (default: 0)
+    ComponentType componentType; //!< The datatype of components in the attribute. (required)
+    unsigned int count; //!< The number of attributes referenced by this accessor. (required)
+    AttribType::Value type; //!< Specifies if the attribute is a scalar, vector, or matrix. (required)
+    std::vector<double> max; //!< Maximum value of each component in this attribute.
+    std::vector<double> min; //!< Minimum value of each component in this attribute.
+
+    unsigned int GetNumComponents();
+    unsigned int GetBytesPerComponent();
+    unsigned int GetElementSize();
+
+    inline uint8_t *GetPointer();
+
+    template <class T>
+    bool ExtractData(T *&outData);
+
+    void WriteData(size_t count, const void *src_buffer, size_t src_stride);
+
+    //! Helper class to iterate the data
+    class Indexer {
+        friend struct Accessor;
+
+        // This field is reported as not used, making it protectd is the easiest way to work around it without going to the bottom of what the problem is:
+        // ../code/glTF2/glTF2Asset.h:392:19: error: private field 'accessor' is not used [-Werror,-Wunused-private-field]
+    protected:
+        Accessor &accessor;
+
+    private:
+        uint8_t *data;
+        size_t elemSize, stride;
+
+        Indexer(Accessor &acc);
+
+    public:
+        //! Accesses the i-th value as defined by the accessor
+        template <class T>
+        T GetValue(int i);
+
+        //! Accesses the i-th value as defined by the accessor
+        inline unsigned int GetUInt(int i) {
+            return GetValue<unsigned int>(i);
+        }
+
+        inline bool IsValid() const {
+            return data != 0;
+        }
+    };
+
+    inline Indexer GetIndexer() {
+        return Indexer(*this);
+    }
+
+    Accessor() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+//! A buffer points to binary geometry, animation, or skins.
+struct Buffer : public Object {
+    /********************* Types *********************/
+    enum Type {
+        Type_arraybuffer,
+        Type_text
+    };
+
+    /// @brief  Descriptor of encoded region in "bufferView".
+    struct SEncodedRegion {
+        const size_t Offset; ///< Offset from begin of "bufferView" to encoded region, in bytes.
+        const size_t EncodedData_Length; ///< Size of encoded region, in bytes.
+        uint8_t *const DecodedData; ///< Cached encoded data.
+        const size_t DecodedData_Length; ///< Size of decoded region, in bytes.
+        const std::string ID; ///< ID of the region.
+
+        /// @brief Constructor.
+        /// \param [in] pOffset - offset from begin of "bufferView" to encoded region, in bytes.
+        /// \param [in] pEncodedData_Length - size of encoded region, in bytes.
+        /// \param [in] pDecodedData - pointer to decoded data array.
+        /// \param [in] pDecodedData_Length - size of encoded region, in bytes.
+        /// \param [in] pID - ID of the region.
+        SEncodedRegion(const size_t pOffset, const size_t pEncodedData_Length, uint8_t *pDecodedData, const size_t pDecodedData_Length, const std::string &pID) :
+                Offset(pOffset), EncodedData_Length(pEncodedData_Length), DecodedData(pDecodedData), DecodedData_Length(pDecodedData_Length), ID(pID) {}
+
+        /// Destructor.
+        ~SEncodedRegion() { delete[] DecodedData; }
+    };
+
+    /******************* Variables *******************/
+
+    size_t byteLength; //!< The length of the buffer in bytes. (default: 0)
+
+    Type type;
+
+    /// \var EncodedRegion_Current
+    /// Pointer to currently active encoded region.
+    /// Why not decoding all regions at once and not to set one buffer with decoded data?
+    /// Yes, why not? Even "accessor" point to decoded data. I mean that fields "byteOffset", "byteStride" and "count" has values which describes decoded
+    /// data array. But only in range of mesh while is active parameters from "compressedData". For another mesh accessors point to decoded data too. But
+    /// offset is counted for another regions is encoded.
+    /// Example. You have two meshes. For every of it you have 4 bytes of data. That data compressed to 2 bytes. So, you have buffer with encoded data:
+    /// M1_E0, M1_E1, M2_E0, M2_E1.
+    /// After decoding you'll get:
+    /// M1_D0, M1_D1, M1_D2, M1_D3, M2_D0, M2_D1, M2_D2, M2_D3.
+    /// "accessors" must to use values that point to decoded data - obviously. So, you'll expect "accessors" like
+    /// "accessor_0" : { byteOffset: 0, byteLength: 4}, "accessor_1" : { byteOffset: 4, byteLength: 4}
+    /// but in real life you'll get:
+    /// "accessor_0" : { byteOffset: 0, byteLength: 4}, "accessor_1" : { byteOffset: 2, byteLength: 4}
+    /// Yes, accessor of next mesh has offset and length which mean: current mesh data is decoded, all other data is encoded.
+    /// And when before you start to read data of current mesh (with encoded data ofcourse) you must decode region of "bufferView", after read finished
+    /// delete encoding mark. And after that you can repeat process: decode data of mesh, read, delete decoded data.
+    ///
+    /// Remark. Encoding all data at once is good in world with computers which do not has RAM limitation. So, you must use step by step encoding in
+    /// exporter and importer. And, thanks to such way, there is no need to load whole file into memory.
+    SEncodedRegion *EncodedRegion_Current;
+
+private:
+    shared_ptr<uint8_t> mData; //!< Pointer to the data
+    bool mIsSpecial; //!< Set to true for special cases (e.g. the body buffer)
+    size_t capacity = 0; //!< The capacity of the buffer in bytes. (default: 0)
+    /// \var EncodedRegion_List
+    /// List of encoded regions.
+    std::list<SEncodedRegion *> EncodedRegion_List;
+
+    /******************* Functions *******************/
+
+public:
+    Buffer();
+    ~Buffer();
+
+    void Read(Value &obj, Asset &r);
+
+    bool LoadFromStream(IOStream &stream, size_t length = 0, size_t baseOffset = 0);
+
+    /// Mark region of "bufferView" as encoded. When data is request from such region then "bufferView" use decoded data.
+    /// \param [in] pOffset - offset from begin of "bufferView" to encoded region, in bytes.
+    /// \param [in] pEncodedData_Length - size of encoded region, in bytes.
+    /// \param [in] pDecodedData - pointer to decoded data array.
+    /// \param [in] pDecodedData_Length - size of encoded region, in bytes.
+    /// \param [in] pID - ID of the region.
+    void EncodedRegion_Mark(const size_t pOffset, const size_t pEncodedData_Length, uint8_t *pDecodedData, const size_t pDecodedData_Length, const std::string &pID);
+
+    /// Select current encoded region by ID. \sa EncodedRegion_Current.
+    /// \param [in] pID - ID of the region.
+    void EncodedRegion_SetCurrent(const std::string &pID);
+
+    /// Replace part of buffer data. Pay attention that function work with original array of data (\ref mData) not with encoded regions.
+    /// \param [in] pBufferData_Offset - index of first element in buffer from which new data will be placed.
+    /// \param [in] pBufferData_Count - count of bytes in buffer which will be replaced.
+    /// \param [in] pReplace_Data - pointer to array with new data for buffer.
+    /// \param [in] pReplace_Count - count of bytes in new data.
+    /// \return true - if successfully replaced, false if input arguments is out of range.
+    bool ReplaceData(const size_t pBufferData_Offset, const size_t pBufferData_Count, const uint8_t *pReplace_Data, const size_t pReplace_Count);
+
+    size_t AppendData(uint8_t *data, size_t length);
+    void Grow(size_t amount);
+
+    uint8_t *GetPointer() { return mData.get(); }
+
+    void MarkAsSpecial() { mIsSpecial = true; }
+
+    bool IsSpecial() const { return mIsSpecial; }
+
+    std::string GetURI() { return std::string(this->id) + ".bin"; }
+
+    static const char *TranslateId(Asset &r, const char *id);
+};
+
+//! A view into a buffer generally representing a subset of the buffer.
+struct BufferView : public Object {
+    Ref<Buffer> buffer; //! The ID of the buffer. (required)
+    size_t byteOffset; //! The offset into the buffer in bytes. (required)
+    size_t byteLength; //! The length of the bufferView in bytes. (default: 0)
+
+    BufferViewTarget target; //! The target that the WebGL buffer should be bound to.
+
+    void Read(Value &obj, Asset &r);
+};
+
+struct Camera : public Object {
+    enum Type {
+        Perspective,
+        Orthographic
+    };
+
+    Type type;
+
+    union {
+        struct {
+            float aspectRatio; //!<The floating - point aspect ratio of the field of view. (0 = undefined = use the canvas one)
+            float yfov; //!<The floating - point vertical field of view in radians. (required)
+            float zfar; //!<The floating - point distance to the far clipping plane. (required)
+            float znear; //!< The floating - point distance to the near clipping plane. (required)
+        } perspective;
+
+        struct {
+            float xmag; //! The floating-point horizontal magnification of the view. (required)
+            float ymag; //! The floating-point vertical magnification of the view. (required)
+            float zfar; //! The floating-point distance to the far clipping plane. (required)
+            float znear; //! The floating-point distance to the near clipping plane. (required)
+        } ortographic;
+    };
+
+    Camera() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+//! Image data used to create a texture.
+struct Image : public Object {
+    std::string uri; //! The uri of the image, that can be a file path, a data URI, etc.. (required)
+    Ref<BufferView> bufferView;
+    std::string mimeType;
+    int width, height;
+
+public:
+    Image();
+    void Read(Value &obj, Asset &r);
+    inline bool HasData() const { return mDataLength > 0; }
+    inline size_t GetDataLength() const { return mDataLength; }
+    inline const uint8_t *GetData() const { return mData.get(); }
+    inline uint8_t *StealData();
+    inline void SetData(uint8_t *data, size_t length, Asset &r);
+
+private:
+    std::unique_ptr<uint8_t[]> mData;
+    size_t mDataLength;
+};
+
+//! Holds a material property that can be a texture or a color
+struct TexProperty {
+    Ref<Texture> texture;
+    vec4 color;
+};
+
+//! The material appearance of a primitive.
+struct Material : public Object {
+    //Ref<Sampler> source; //!< The ID of the technique.
+    //std::gltf_unordered_map<std::string, std::string> values; //!< A dictionary object of parameter values.
+
+    //! Techniques defined by KHR_materials_common
+    enum Technique {
+        Technique_undefined = 0,
+        Technique_BLINN,
+        Technique_PHONG,
+        Technique_LAMBERT,
+        Technique_CONSTANT
+    };
+
+    TexProperty ambient;
+    TexProperty diffuse;
+    TexProperty specular;
+    TexProperty emission;
+
+    bool doubleSided;
+    bool transparent;
+    float transparency;
+    float shininess;
+
+    Technique technique;
+
+    Material() { SetDefaults(); }
+    void Read(Value &obj, Asset &r);
+    void SetDefaults();
+};
+
+//! A set of primitives to be rendered. A node can contain one or more meshes. A node's transform places the mesh in the scene.
+struct Mesh : public Object {
+    typedef std::vector<Ref<Accessor>> AccessorList;
+
+    struct Primitive {
+        PrimitiveMode mode;
+
+        struct Attributes {
+            AccessorList position, normal, texcoord, color, joint, jointmatrix, weight;
+        } attributes;
+
+        Ref<Accessor> indices;
+
+        Ref<Material> material;
+    };
+
+    /// \struct SExtension
+    /// Extension used for mesh.
+    struct SExtension {
+        /// \enum EType
+        /// Type of extension.
+        enum EType {
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+            Compression_Open3DGC, ///< Compression of mesh data using Open3DGC algorithm.
+#endif
+
+            Unknown
+        };
+
+        EType Type; ///< Type of extension.
+
+        /// \fn SExtension
+        /// Constructor.
+        /// \param [in] pType - type of extension.
+        SExtension(const EType pType) :
+                Type(pType) {}
+
+        virtual ~SExtension() {
+            // empty
+        }
+    };
+
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+
+    /// \struct SCompression_Open3DGC
+    /// Compression of mesh data using Open3DGC algorithm.
+    struct SCompression_Open3DGC : public SExtension {
+        using SExtension::Type;
+
+        std::string Buffer; ///< ID of "buffer" used for storing compressed data.
+        size_t Offset; ///< Offset in "bufferView" where compressed data are stored.
+        size_t Count; ///< Count of elements in compressed data. Is always equivalent to size in bytes: look comments for "Type" and "Component_Type".
+        bool Binary; ///< If true then "binary" mode is used for coding, if false - "ascii" mode.
+        size_t IndicesCount; ///< Count of indices in mesh.
+        size_t VerticesCount; ///< Count of vertices in mesh.
+        // AttribType::Value Type;///< Is always "SCALAR".
+        // ComponentType Component_Type;///< Is always "ComponentType_UNSIGNED_BYTE" (5121).
+
+        /// \fn SCompression_Open3DGC
+        /// Constructor.
+        SCompression_Open3DGC() :
+                SExtension(Compression_Open3DGC) {
+            // empty
+        }
+
+        virtual ~SCompression_Open3DGC() {
+            // empty
+        }
+    };
+#endif
+
+    std::vector<Primitive> primitives;
+    std::list<SExtension *> Extension; ///< List of extensions used in mesh.
+
+    Mesh() {}
+
+    /// Destructor.
+    ~Mesh() {
+        for (std::list<SExtension *>::iterator it = Extension.begin(), it_end = Extension.end(); it != it_end; it++) {
+            delete *it;
+        };
+    }
+
+    /// @brief Get mesh data from JSON-object and place them to root asset.
+    /// \param [in] pJSON_Object - reference to pJSON-object from which data are read.
+    /// \param [out] pAsset_Root - reference to root asset where data will be stored.
+    void Read(Value &pJSON_Object, Asset &pAsset_Root);
+
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+    /// @brief Decode part of "buffer" which encoded with Open3DGC algorithm.
+    /// \param [in] pCompression_Open3DGC - reference to structure which describe encoded region.
+    /// \param [out] pAsset_Root - reference to root assed where data will be stored.
+    void Decode_O3DGC(const SCompression_Open3DGC &pCompression_Open3DGC, Asset &pAsset_Root);
+#endif
+};
+
+struct Node : public Object {
+    std::vector<Ref<Node>> children;
+    std::vector<Ref<Mesh>> meshes;
+
+    Nullable<mat4> matrix;
+    Nullable<vec3> translation;
+    Nullable<vec4> rotation;
+    Nullable<vec3> scale;
+
+    Ref<Camera> camera;
+    Ref<Light> light;
+
+    std::vector<Ref<Node>> skeletons; //!< The ID of skeleton nodes. Each of which is the root of a node hierarchy.
+    Ref<Skin> skin; //!< The ID of the skin referenced by this node.
+    std::string jointName; //!< Name used when this node is a joint in a skin.
+
+    Ref<Node> parent; //!< This is not part of the glTF specification. Used as a helper.
+
+    Node() {}
+    void Read(Value &obj, Asset &r);
+};
+
+struct Program : public Object {
+    Program() {}
+    void Read(Value &obj, Asset &r);
+};
+
+struct Sampler : public Object {
+    SamplerMagFilter magFilter; //!< The texture magnification filter. (required)
+    SamplerMinFilter minFilter; //!< The texture minification filter. (required)
+    SamplerWrap wrapS; //!< The texture wrapping in the S direction. (required)
+    SamplerWrap wrapT; //!< The texture wrapping in the T direction. (required)
+
+    Sampler() = default;
+    void Read(Value &obj, Asset &r);
+    void SetDefaults();
+};
+
+struct Scene : public Object {
+    std::vector<Ref<Node>> nodes;
+
+    Scene() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+struct Shader : public Object {
+    Shader() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+struct Skin : public Object {
+    Nullable<mat4> bindShapeMatrix; //!< Floating-point 4x4 transformation matrix stored in column-major order.
+    Ref<Accessor> inverseBindMatrices; //!< The ID of the accessor containing the floating-point 4x4 inverse-bind matrices.
+    std::vector<Ref<Node>> jointNames; //!< Joint names of the joints (nodes with a jointName property) in this skin.
+    std::string name; //!< The user-defined name of this object.
+
+    Skin() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+struct Technique : public Object {
+    struct Parameters {
+    };
+
+    struct States {
+    };
+
+    struct Functions {
+    };
+
+    Technique() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+//! A texture and its sampler.
+struct Texture : public Object {
+    Ref<Sampler> sampler; //!< The ID of the sampler used by this texture. (required)
+    Ref<Image> source; //!< The ID of the image used by this texture. (required)
+
+    Texture() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+//! A light (from KHR_materials_common extension)
+struct Light : public Object {
+    enum Type {
+        Type_undefined,
+        Type_ambient,
+        Type_directional,
+        Type_point,
+        Type_spot
+    };
+
+    Type type;
+    vec4 color;
+    float distance;
+    float constantAttenuation;
+    float linearAttenuation;
+    float quadraticAttenuation;
+    float falloffAngle;
+    float falloffExponent;
+
+    Light() = default;
+    void Read(Value &obj, Asset &r);
+    void SetDefaults();
+};
+
+struct Animation : public Object {
+    struct AnimSampler {
+        std::string id; //!< The ID of this sampler.
+        std::string input; //!< The ID of a parameter in this animation to use as key-frame input.
+        std::string interpolation; //!< Type of interpolation algorithm to use between key-frames.
+        std::string output; //!< The ID of a parameter in this animation to use as key-frame output.
+    };
+
+    struct AnimChannel {
+        std::string sampler; //!< The ID of one sampler present in the containing animation's samplers property.
+
+        struct AnimTarget {
+            Ref<Node> id; //!< The ID of the node to animate.
+            std::string path; //!< The name of property of the node to animate ("translation", "rotation", or "scale").
+        } target;
+    };
+
+    struct AnimParameters {
+        Ref<Accessor> TIME; //!< Accessor reference to a buffer storing a array of floating point scalar values.
+        Ref<Accessor> rotation; //!< Accessor reference to a buffer storing a array of four-component floating-point vectors.
+        Ref<Accessor> scale; //!< Accessor reference to a buffer storing a array of three-component floating-point vectors.
+        Ref<Accessor> translation; //!< Accessor reference to a buffer storing a array of three-component floating-point vectors.
+    };
+
+    std::vector<AnimChannel> Channels; //!< Connect the output values of the key-frame animation to a specific node in the hierarchy.
+    AnimParameters Parameters; //!< The samplers that interpolate between the key-frames.
+    std::vector<AnimSampler> Samplers; //!< The parameterized inputs representing the key-frame data.
+
+    Animation() = default;
+    void Read(Value &obj, Asset &r);
+};
+
+//! Base class for LazyDict that acts as an interface
+class LazyDictBase {
+public:
+    virtual ~LazyDictBase() {}
+
+    virtual void AttachToDocument(Document &doc) = 0;
+    virtual void DetachFromDocument() = 0;
+
+#if !defined(ASSIMP_BUILD_NO_EXPORT)
+    virtual void WriteObjects(AssetWriter &writer) = 0;
+#endif
+};
+
+template <class T>
+class LazyDict;
+
+//! (Implemented in glTFAssetWriter.h)
+template <class T>
+void WriteLazyDict(LazyDict<T> &d, AssetWriter &w);
+
+//! Manages lazy loading of the glTF top-level objects, and keeps a reference to them by ID
+//! It is the owner the loaded objects, so when it is destroyed it also deletes them
+template <class T>
+class LazyDict : public LazyDictBase {
+    friend class Asset;
+    friend class AssetWriter;
+
+    typedef typename std::gltf_unordered_map<std::string, unsigned int> Dict;
+
+    std::vector<T *> mObjs; //! The read objects
+    Dict mObjsById; //! The read objects accessible by id
+    const char *mDictId; //! ID of the dictionary object
+    const char *mExtId; //! ID of the extension defining the dictionary
+    Value *mDict; //! JSON dictionary object
+    Asset &mAsset; //! The asset instance
+
+    void AttachToDocument(Document &doc);
+    void DetachFromDocument();
+
+#if !defined(ASSIMP_BUILD_NO_EXPORT)
+    void WriteObjects(AssetWriter &writer) { WriteLazyDict<T>(*this, writer); }
+#endif
+
+    Ref<T> Add(T *obj);
+
+public:
+    LazyDict(Asset &asset, const char *dictId, const char *extId = 0);
+    ~LazyDict();
+
+    Ref<T> Get(const char *id);
+    Ref<T> Get(unsigned int i);
+    Ref<T> Get(const std::string &pID) { return Get(pID.c_str()); }
+
+    Ref<T> Create(const char *id);
+    Ref<T> Create(const std::string &id) { return Create(id.c_str()); }
+
+    inline unsigned int Size() const { return unsigned(mObjs.size()); }
+
+    inline T &operator[](size_t i) { return *mObjs[i]; }
+};
+
+struct AssetMetadata {
+    std::string copyright; //!< A copyright message suitable for display to credit the content creator.
+    std::string generator; //!< Tool that generated this glTF model.Useful for debugging.
+    bool premultipliedAlpha; //!< Specifies if the shaders were generated with premultiplied alpha. (default: false)
+
+    struct {
+        std::string api; //!< Specifies the target rendering API (default: "WebGL")
+        std::string version; //!< Specifies the target rendering API (default: "1.0.3")
+    } profile; //!< Specifies the target rendering API and version, e.g., WebGL 1.0.3. (default: {})
+
+    std::string version; //!< The glTF format version (should be 1.0)
+
+    void Read(Document &doc);
+
+    AssetMetadata() :
+            premultipliedAlpha(false), version() {
+    }
+};
+
+//
+// glTF Asset class
+//
+
+//! Root object for a glTF asset
+class Asset {
+    using IdMap = std::gltf_unordered_map<std::string, int>;
+
+    template <class T>
+    friend class LazyDict;
+    friend struct Buffer; // To access OpenFile
+    friend class AssetWriter;
+
+private:
+    IOSystem *mIOSystem;
+
+    std::string mCurrentAssetDir;
+
+    size_t mSceneLength;
+    size_t mBodyOffset, mBodyLength;
+
+    std::vector<LazyDictBase *> mDicts;
+
+    IdMap mUsedIds;
+
+    Ref<Buffer> mBodyBuffer;
+
+    Asset(Asset &);
+    Asset &operator=(const Asset &);
+
+public:
+    //! Keeps info about the enabled extensions
+    struct Extensions {
+        bool KHR_binary_glTF;
+        bool KHR_materials_common;
+
+    } extensionsUsed;
+
+    AssetMetadata asset;
+
+    // Dictionaries for each type of object
+
+    LazyDict<Accessor> accessors;
+    LazyDict<Animation> animations;
+    LazyDict<Buffer> buffers;
+    LazyDict<BufferView> bufferViews;
+    LazyDict<Camera> cameras;
+    LazyDict<Image> images;
+    LazyDict<Material> materials;
+    LazyDict<Mesh> meshes;
+    LazyDict<Node> nodes;
+    LazyDict<Sampler> samplers;
+    LazyDict<Scene> scenes;
+    LazyDict<Skin> skins;
+    LazyDict<Texture> textures;
+
+    LazyDict<Light> lights; // KHR_materials_common ext
+
+    Ref<Scene> scene;
+
+public:
+    Asset(IOSystem *io = 0) :
+            mIOSystem(io), 
+            asset(), 
+            accessors(*this, "accessors"), 
+            animations(*this, "animations"), 
+            buffers(*this, "buffers"), 
+            bufferViews(*this, "bufferViews"), 
+            cameras(*this, "cameras"), 
+            images(*this, "images"), 
+            materials(*this, "materials"), 
+            meshes(*this, "meshes"), 
+            nodes(*this, "nodes"),
+            samplers(*this, "samplers"),
+            scenes(*this, "scenes"),
+            skins(*this, "skins"),
+            textures(*this, "textures"),
+            lights(*this, "lights", "KHR_materials_common") {
+        memset(&extensionsUsed, 0, sizeof(extensionsUsed));
+    }
+
+    //! Main function
+    void Load(const std::string &file, bool isBinary = false);
+
+    //! Enables the "KHR_binary_glTF" extension on the asset
+    void SetAsBinary();
+
+    //! Search for an available name, starting from the given strings
+    std::string FindUniqueID(const std::string &str, const char *suffix);
+
+    Ref<Buffer> GetBodyBuffer() { return mBodyBuffer; }
+
+private:
+    void ReadBinaryHeader(IOStream &stream);
+
+    void ReadExtensionsUsed(Document &doc);
+
+    IOStream *OpenFile(const std::string &path, const char *mode, bool absolute = false);
+};
+
+} // namespace glTF
+
+// Include the implementation of the methods
+#include "glTFAsset.inl"
+
+#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER
+
+#endif // GLTFASSET_H_INC
diff --git a/libs/assimp/code/AssetLib/glTF/glTFAsset.inl b/libs/assimp/code/AssetLib/glTF/glTFAsset.inl
new file mode 100644
index 0000000..2b76a30
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFAsset.inl
@@ -0,0 +1,1316 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+#include <assimp/MemoryIOWrapper.h>
+#include <assimp/StringUtils.h>
+#include <iomanip>
+
+// Header files, Assimp
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/Base64.hpp>
+
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+// Header files, Open3DGC.
+#include <Open3DGC/o3dgcSC3DMCDecoder.h>
+#endif
+
+using namespace Assimp;
+using namespace glTFCommon;
+
+namespace glTF {
+
+#if _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4706)
+#endif // _MSC_VER
+
+//
+// LazyDict methods
+//
+
+template <class T>
+inline LazyDict<T>::LazyDict(Asset &asset, const char *dictId, const char *extId) :
+        mDictId(dictId), mExtId(extId), mDict(0), mAsset(asset) {
+    asset.mDicts.push_back(this); // register to the list of dictionaries
+}
+
+template <class T>
+inline LazyDict<T>::~LazyDict() {
+    for (size_t i = 0; i < mObjs.size(); ++i) {
+        delete mObjs[i];
+    }
+}
+
+template <class T>
+inline void LazyDict<T>::AttachToDocument(Document &doc) {
+    Value *container = 0;
+
+    if (mExtId) {
+        if (Value *exts = FindObject(doc, "extensions")) {
+            container = FindObject(*exts, mExtId);
+        }
+    } else {
+        container = &doc;
+    }
+
+    if (container) {
+        mDict = FindObject(*container, mDictId);
+    }
+}
+
+template <class T>
+inline void LazyDict<T>::DetachFromDocument() {
+    mDict = 0;
+}
+
+template <class T>
+Ref<T> LazyDict<T>::Get(unsigned int i) {
+    return Ref<T>(mObjs, i);
+}
+
+template <class T>
+Ref<T> LazyDict<T>::Get(const char *id) {
+    id = T::TranslateId(mAsset, id);
+
+    typename Dict::iterator it = mObjsById.find(id);
+    if (it != mObjsById.end()) { // already created?
+        return Ref<T>(mObjs, it->second);
+    }
+
+    // read it from the JSON object
+    if (!mDict) {
+        throw DeadlyImportError("GLTF: Missing section \"", mDictId, "\"");
+    }
+
+    Value::MemberIterator obj = mDict->FindMember(id);
+    if (obj == mDict->MemberEnd()) {
+        throw DeadlyImportError("GLTF: Missing object with id \"", id, "\" in \"", mDictId, "\"");
+    }
+    if (!obj->value.IsObject()) {
+        throw DeadlyImportError("GLTF: Object with id \"", id, "\" is not a JSON object");
+    }
+
+    // create an instance of the given type
+    T *inst = new T();
+    inst->id = id;
+    ReadMember(obj->value, "name", inst->name);
+    inst->Read(obj->value, mAsset);
+    return Add(inst);
+}
+
+template <class T>
+Ref<T> LazyDict<T>::Add(T *obj) {
+    unsigned int idx = unsigned(mObjs.size());
+    mObjs.push_back(obj);
+    mObjsById[obj->id] = idx;
+    mAsset.mUsedIds[obj->id] = true;
+    return Ref<T>(mObjs, idx);
+}
+
+template <class T>
+Ref<T> LazyDict<T>::Create(const char *id) {
+    Asset::IdMap::iterator it = mAsset.mUsedIds.find(id);
+    if (it != mAsset.mUsedIds.end()) {
+        throw DeadlyImportError("GLTF: two objects with the same ID exist");
+    }
+    T *inst = new T();
+    inst->id = id;
+    return Add(inst);
+}
+
+//
+// glTF dictionary objects methods
+//
+
+inline Buffer::Buffer() :
+        byteLength(0), type(Type_arraybuffer), EncodedRegion_Current(nullptr), mIsSpecial(false) {}
+
+inline Buffer::~Buffer() {
+    for (SEncodedRegion *reg : EncodedRegion_List)
+        delete reg;
+}
+
+inline const char *Buffer::TranslateId(Asset &r, const char *id) {
+    // Compatibility with old spec
+    if (r.extensionsUsed.KHR_binary_glTF && strcmp(id, "KHR_binary_glTF") == 0) {
+        return "binary_glTF";
+    }
+
+    return id;
+}
+
+inline void Buffer::Read(Value &obj, Asset &r) {
+    size_t statedLength = MemberOrDefault<size_t>(obj, "byteLength", 0);
+    byteLength = statedLength;
+
+    Value *it = FindString(obj, "uri");
+    if (!it) {
+        if (statedLength > 0) {
+            throw DeadlyImportError("GLTF: buffer with non-zero length missing the \"uri\" attribute");
+        }
+        return;
+    }
+
+    const char *uri = it->GetString();
+
+    glTFCommon::Util::DataURI dataURI;
+    if (ParseDataURI(uri, it->GetStringLength(), dataURI)) {
+        if (dataURI.base64) {
+            uint8_t *data = 0;
+            this->byteLength = Base64::Decode(dataURI.data, dataURI.dataLength, data);
+            this->mData.reset(data, std::default_delete<uint8_t[]>());
+
+            if (statedLength > 0 && this->byteLength != statedLength) {
+                throw DeadlyImportError("GLTF: buffer \"", id, "\", expected ", ai_to_string(statedLength),
+                        " bytes, but found ", ai_to_string(dataURI.dataLength));
+            }
+        } else { // assume raw data
+            if (statedLength != dataURI.dataLength) {
+                throw DeadlyImportError("GLTF: buffer \"", id, "\", expected ", ai_to_string(statedLength),
+                        " bytes, but found ", ai_to_string(dataURI.dataLength));
+            }
+
+            this->mData.reset(new uint8_t[dataURI.dataLength], std::default_delete<uint8_t[]>());
+            memcpy(this->mData.get(), dataURI.data, dataURI.dataLength);
+        }
+    } else { // Local file
+        if (byteLength > 0) {
+            std::string dir = !r.mCurrentAssetDir.empty() ? (
+                                                                    r.mCurrentAssetDir.back() == '/' ?
+                                                                            r.mCurrentAssetDir :
+                                                                            r.mCurrentAssetDir + '/') :
+                                                            "";
+
+            IOStream *file = r.OpenFile(dir + uri, "rb");
+            if (file) {
+                bool ok = LoadFromStream(*file, byteLength);
+                delete file;
+
+                if (!ok)
+                    throw DeadlyImportError("GLTF: error while reading referenced file \"", uri, "\"");
+            } else {
+                throw DeadlyImportError("GLTF: could not open referenced file \"", uri, "\"");
+            }
+        }
+    }
+}
+
+inline bool Buffer::LoadFromStream(IOStream &stream, size_t length, size_t baseOffset) {
+    byteLength = length ? length : stream.FileSize();
+
+    if (baseOffset) {
+        stream.Seek(baseOffset, aiOrigin_SET);
+    }
+
+    mData.reset(new uint8_t[byteLength], std::default_delete<uint8_t[]>());
+
+    if (stream.Read(mData.get(), byteLength, 1) != 1) {
+        return false;
+    }
+    return true;
+}
+
+inline void Buffer::EncodedRegion_Mark(const size_t pOffset, const size_t pEncodedData_Length, uint8_t *pDecodedData, const size_t pDecodedData_Length, const std::string &pID) {
+    // Check pointer to data
+    if (pDecodedData == nullptr) throw DeadlyImportError("GLTF: for marking encoded region pointer to decoded data must be provided.");
+
+    // Check offset
+    if (pOffset > byteLength) {
+        const uint8_t val_size = 32;
+
+        char val[val_size];
+
+        ai_snprintf(val, val_size, AI_SIZEFMT, pOffset);
+        throw DeadlyImportError("GLTF: incorrect offset value (", val, ") for marking encoded region.");
+    }
+
+    // Check length
+    if ((pOffset + pEncodedData_Length) > byteLength) {
+        const uint8_t val_size = 64;
+
+        char val[val_size];
+
+        ai_snprintf(val, val_size, AI_SIZEFMT "/" AI_SIZEFMT, pOffset, pEncodedData_Length);
+        throw DeadlyImportError("GLTF: encoded region with offset/length (", val, ") is out of range.");
+    }
+
+    // Add new region
+    EncodedRegion_List.push_back(new SEncodedRegion(pOffset, pEncodedData_Length, pDecodedData, pDecodedData_Length, pID));
+    // And set new value for "byteLength"
+    byteLength += (pDecodedData_Length - pEncodedData_Length);
+}
+
+inline void Buffer::EncodedRegion_SetCurrent(const std::string &pID) {
+    if ((EncodedRegion_Current != nullptr) && (EncodedRegion_Current->ID == pID)) return;
+
+    for (SEncodedRegion *reg : EncodedRegion_List) {
+        if (reg->ID == pID) {
+            EncodedRegion_Current = reg;
+
+            return;
+        }
+    }
+
+    throw DeadlyImportError("GLTF: EncodedRegion with ID: \"", pID, "\" not found.");
+}
+
+inline bool Buffer::ReplaceData(const size_t pBufferData_Offset, const size_t pBufferData_Count, const uint8_t *pReplace_Data, const size_t pReplace_Count) {
+    const size_t new_data_size = byteLength + pReplace_Count - pBufferData_Count;
+
+    uint8_t *new_data;
+
+    if ((pBufferData_Count == 0) || (pReplace_Count == 0) || (pReplace_Data == nullptr)) return false;
+
+    new_data = new uint8_t[new_data_size];
+    // Copy data which place before replacing part.
+    memcpy(new_data, mData.get(), pBufferData_Offset);
+    // Copy new data.
+    memcpy(&new_data[pBufferData_Offset], pReplace_Data, pReplace_Count);
+    // Copy data which place after replacing part.
+    memcpy(&new_data[pBufferData_Offset + pReplace_Count], &mData.get()[pBufferData_Offset + pBufferData_Count], pBufferData_Offset);
+    // Apply new data
+    mData.reset(new_data, std::default_delete<uint8_t[]>());
+    byteLength = new_data_size;
+
+    return true;
+}
+
+inline size_t Buffer::AppendData(uint8_t *data, size_t length) {
+    size_t offset = this->byteLength;
+    Grow(length);
+    memcpy(mData.get() + offset, data, length);
+    return offset;
+}
+
+inline void Buffer::Grow(size_t amount) {
+    if (amount <= 0) return;
+    if (capacity >= byteLength + amount) {
+        byteLength += amount;
+        return;
+    }
+
+    // Shift operation is standard way to divide integer by 2, it doesn't cast it to float back and forth, also works for odd numbers,
+    // originally it would look like: static_cast<size_t>(capacity * 1.5f)
+    capacity = std::max(capacity + (capacity >> 1), byteLength + amount);
+
+    uint8_t *b = new uint8_t[capacity];
+    if (mData) memcpy(b, mData.get(), byteLength);
+    mData.reset(b, std::default_delete<uint8_t[]>());
+    byteLength += amount;
+}
+
+//
+// struct BufferView
+//
+
+inline void BufferView::Read(Value &obj, Asset &r) {
+    const char *bufferId = MemberOrDefault<const char *>(obj, "buffer", 0);
+    if (bufferId) {
+        buffer = r.buffers.Get(bufferId);
+    }
+
+    byteOffset = MemberOrDefault(obj, "byteOffset", 0u);
+    byteLength = MemberOrDefault(obj, "byteLength", 0u);
+}
+
+//
+// struct Accessor
+//
+
+inline void Accessor::Read(Value &obj, Asset &r) {
+    const char *bufferViewId = MemberOrDefault<const char *>(obj, "bufferView", 0);
+    if (bufferViewId) {
+        bufferView = r.bufferViews.Get(bufferViewId);
+    }
+
+    byteOffset = MemberOrDefault(obj, "byteOffset", 0u);
+    byteStride = MemberOrDefault(obj, "byteStride", 0u);
+    componentType = MemberOrDefault(obj, "componentType", ComponentType_BYTE);
+    count = MemberOrDefault(obj, "count", 0u);
+
+    const char *typestr;
+    type = ReadMember(obj, "type", typestr) ? AttribType::FromString(typestr) : AttribType::SCALAR;
+}
+
+inline unsigned int Accessor::GetNumComponents() {
+    return AttribType::GetNumComponents(type);
+}
+
+inline unsigned int Accessor::GetBytesPerComponent() {
+    return int(ComponentTypeSize(componentType));
+}
+
+inline unsigned int Accessor::GetElementSize() {
+    return GetNumComponents() * GetBytesPerComponent();
+}
+
+inline uint8_t *Accessor::GetPointer() {
+    if (!bufferView || !bufferView->buffer) return 0;
+    uint8_t *basePtr = bufferView->buffer->GetPointer();
+    if (!basePtr) return 0;
+
+    size_t offset = byteOffset + bufferView->byteOffset;
+
+    // Check if region is encoded.
+    if (bufferView->buffer->EncodedRegion_Current != nullptr) {
+        const size_t begin = bufferView->buffer->EncodedRegion_Current->Offset;
+        const size_t end = begin + bufferView->buffer->EncodedRegion_Current->DecodedData_Length;
+
+        if ((offset >= begin) && (offset < end))
+            return &bufferView->buffer->EncodedRegion_Current->DecodedData[offset - begin];
+    }
+
+    return basePtr + offset;
+}
+
+namespace {
+inline void CopyData(size_t count,
+        const uint8_t *src, size_t src_stride,
+        uint8_t *dst, size_t dst_stride) {
+    if (src_stride == dst_stride) {
+        memcpy(dst, src, count * src_stride);
+    } else {
+        size_t sz = std::min(src_stride, dst_stride);
+        for (size_t i = 0; i < count; ++i) {
+            memcpy(dst, src, sz);
+            if (sz < dst_stride) {
+                memset(dst + sz, 0, dst_stride - sz);
+            }
+            src += src_stride;
+            dst += dst_stride;
+        }
+    }
+}
+} // namespace
+
+template <class T>
+bool Accessor::ExtractData(T *&outData) {
+    uint8_t *data = GetPointer();
+    if (!data) return false;
+
+    const size_t elemSize = GetElementSize();
+    const size_t totalSize = elemSize * count;
+
+    const size_t stride = byteStride ? byteStride : elemSize;
+
+    const size_t targetElemSize = sizeof(T);
+    ai_assert(elemSize <= targetElemSize);
+
+    ai_assert(count * stride <= bufferView->byteLength);
+
+    outData = new T[count];
+    if (stride == elemSize && targetElemSize == elemSize) {
+        memcpy(outData, data, totalSize);
+    } else {
+        for (size_t i = 0; i < count; ++i) {
+            memcpy(outData + i, data + i * stride, elemSize);
+        }
+    }
+
+    return true;
+}
+
+inline void Accessor::WriteData(size_t cnt, const void *src_buffer, size_t src_stride) {
+    uint8_t *buffer_ptr = bufferView->buffer->GetPointer();
+    size_t offset = byteOffset + bufferView->byteOffset;
+
+    size_t dst_stride = GetNumComponents() * GetBytesPerComponent();
+
+    const uint8_t *src = reinterpret_cast<const uint8_t *>(src_buffer);
+    uint8_t *dst = reinterpret_cast<uint8_t *>(buffer_ptr + offset);
+
+    ai_assert(dst + count * dst_stride <= buffer_ptr + bufferView->buffer->byteLength);
+    CopyData(cnt, src, src_stride, dst, dst_stride);
+}
+
+inline Accessor::Indexer::Indexer(Accessor &acc) :
+        accessor(acc), data(acc.GetPointer()), elemSize(acc.GetElementSize()), stride(acc.byteStride ? acc.byteStride : elemSize) {
+}
+
+//! Accesses the i-th value as defined by the accessor
+template <class T>
+T Accessor::Indexer::GetValue(int i) {
+    ai_assert(data);
+    ai_assert(i * stride < accessor.bufferView->byteLength);
+    T value = T();
+    memcpy(&value, data + i * stride, elemSize);
+    //value >>= 8 * (sizeof(T) - elemSize);
+    return value;
+}
+
+inline Image::Image() :
+        width(0), height(0), mDataLength(0) {
+}
+
+inline void Image::Read(Value &obj, Asset &r) {
+    // Check for extensions first (to detect binary embedded data)
+    if (Value *extensions = FindObject(obj, "extensions")) {
+        if (r.extensionsUsed.KHR_binary_glTF) {
+            if (Value *ext = FindObject(*extensions, "KHR_binary_glTF")) {
+
+                width = MemberOrDefault(*ext, "width", 0);
+                height = MemberOrDefault(*ext, "height", 0);
+
+                ReadMember(*ext, "mimeType", mimeType);
+
+                const char *bufferViewId;
+                if (ReadMember(*ext, "bufferView", bufferViewId)) {
+                    Ref<BufferView> bv = r.bufferViews.Get(bufferViewId);
+                    if (bv) {
+                        mDataLength = bv->byteLength;
+                        mData.reset(new uint8_t[mDataLength]);
+                        memcpy(mData.get(), bv->buffer->GetPointer() + bv->byteOffset, mDataLength);
+                    }
+                }
+            }
+        }
+    }
+
+    if (!mDataLength) {
+        Value *curUri = FindString(obj, "uri");
+        if (nullptr != curUri) {
+            const char *uristr = curUri->GetString();
+
+            glTFCommon::Util::DataURI dataURI;
+            if (ParseDataURI(uristr, curUri->GetStringLength(), dataURI)) {
+                mimeType = dataURI.mediaType;
+                if (dataURI.base64) {
+                    uint8_t *ptr = nullptr;
+                    mDataLength = Base64::Decode(dataURI.data, dataURI.dataLength, ptr);
+                    mData.reset(ptr);
+                }
+            } else {
+                this->uri = uristr;
+            }
+        }
+    }
+}
+
+inline uint8_t *Image::StealData() {
+    mDataLength = 0;
+    return mData.release();
+}
+
+inline void Image::SetData(uint8_t *data, size_t length, Asset &r) {
+    Ref<Buffer> b = r.GetBodyBuffer();
+    if (b) { // binary file: append to body
+        std::string bvId = r.FindUniqueID(this->id, "imgdata");
+        bufferView = r.bufferViews.Create(bvId);
+
+        bufferView->buffer = b;
+        bufferView->byteLength = length;
+        bufferView->byteOffset = b->AppendData(data, length);
+    } else { // text file: will be stored as a data uri
+        uint8_t *temp = new uint8_t[length];
+        memcpy(temp, data, length);
+        this->mData.reset(temp);
+        this->mDataLength = length;
+    }
+}
+
+inline void Sampler::Read(Value &obj, Asset & /*r*/) {
+    SetDefaults();
+
+    ReadMember(obj, "magFilter", magFilter);
+    ReadMember(obj, "minFilter", minFilter);
+    ReadMember(obj, "wrapS", wrapS);
+    ReadMember(obj, "wrapT", wrapT);
+}
+
+inline void Sampler::SetDefaults() {
+    magFilter = SamplerMagFilter_Linear;
+    minFilter = SamplerMinFilter_Linear;
+    wrapS = SamplerWrap_Repeat;
+    wrapT = SamplerWrap_Repeat;
+}
+
+inline void Texture::Read(Value &obj, Asset &r) {
+    const char *sourcestr;
+    if (ReadMember(obj, "source", sourcestr)) {
+        source = r.images.Get(sourcestr);
+    }
+
+    const char *samplerstr;
+    if (ReadMember(obj, "sampler", samplerstr)) {
+        sampler = r.samplers.Get(samplerstr);
+    }
+}
+
+namespace {
+inline void ReadMaterialProperty(Asset &r, Value &vals, const char *propName, TexProperty &out) {
+    if (Value *prop = FindMember(vals, propName)) {
+        if (prop->IsString()) {
+            out.texture = r.textures.Get(prop->GetString());
+        } else {
+            ReadValue(*prop, out.color);
+        }
+    }
+}
+} // namespace
+
+inline void Material::Read(Value &material, Asset &r) {
+    SetDefaults();
+
+    if (Value *values = FindObject(material, "values")) {
+        ReadMaterialProperty(r, *values, "ambient", this->ambient);
+        ReadMaterialProperty(r, *values, "diffuse", this->diffuse);
+        ReadMaterialProperty(r, *values, "specular", this->specular);
+
+        ReadMember(*values, "transparency", transparency);
+        ReadMember(*values, "shininess", shininess);
+    }
+
+    if (Value *extensions = FindObject(material, "extensions")) {
+        if (r.extensionsUsed.KHR_materials_common) {
+            if (Value *ext = FindObject(*extensions, "KHR_materials_common")) {
+                if (Value *tnq = FindString(*ext, "technique")) {
+                    const char *t = tnq->GetString();
+                    if (strcmp(t, "BLINN") == 0)
+                        technique = Technique_BLINN;
+                    else if (strcmp(t, "PHONG") == 0)
+                        technique = Technique_PHONG;
+                    else if (strcmp(t, "LAMBERT") == 0)
+                        technique = Technique_LAMBERT;
+                    else if (strcmp(t, "CONSTANT") == 0)
+                        technique = Technique_CONSTANT;
+                }
+
+                if (Value *values = FindObject(*ext, "values")) {
+                    ReadMaterialProperty(r, *values, "ambient", this->ambient);
+                    ReadMaterialProperty(r, *values, "diffuse", this->diffuse);
+                    ReadMaterialProperty(r, *values, "specular", this->specular);
+
+                    ReadMember(*values, "doubleSided", doubleSided);
+                    ReadMember(*values, "transparent", transparent);
+                    ReadMember(*values, "transparency", transparency);
+                    ReadMember(*values, "shininess", shininess);
+                }
+            }
+        }
+    }
+}
+
+namespace {
+void SetVector(vec4 &v, float x, float y, float z, float w) {
+    v[0] = x;
+    v[1] = y;
+    v[2] = z;
+    v[3] = w;
+}
+} // namespace
+
+inline void Material::SetDefaults() {
+    SetVector(ambient.color, 0, 0, 0, 1);
+    SetVector(diffuse.color, 0, 0, 0, 1);
+    SetVector(specular.color, 0, 0, 0, 1);
+    SetVector(emission.color, 0, 0, 0, 1);
+
+    doubleSided = false;
+    transparent = false;
+    transparency = 1.0;
+    shininess = 0.0;
+
+    technique = Technique_undefined;
+}
+
+namespace {
+
+template <int N>
+inline int Compare(const char *attr, const char (&str)[N]) {
+    return (strncmp(attr, str, N - 1) == 0) ? N - 1 : 0;
+}
+
+inline bool GetAttribVector(Mesh::Primitive &p, const char *attr, Mesh::AccessorList *&v, int &pos) {
+    if ((pos = Compare(attr, "POSITION"))) {
+        v = &(p.attributes.position);
+    } else if ((pos = Compare(attr, "NORMAL"))) {
+        v = &(p.attributes.normal);
+    } else if ((pos = Compare(attr, "TEXCOORD"))) {
+        v = &(p.attributes.texcoord);
+    } else if ((pos = Compare(attr, "COLOR"))) {
+        v = &(p.attributes.color);
+    } else if ((pos = Compare(attr, "JOINT"))) {
+        v = &(p.attributes.joint);
+    } else if ((pos = Compare(attr, "JOINTMATRIX"))) {
+        v = &(p.attributes.jointmatrix);
+    } else if ((pos = Compare(attr, "WEIGHT"))) {
+        v = &(p.attributes.weight);
+    } else
+        return false;
+    return true;
+}
+} // namespace
+
+inline void Mesh::Read(Value &pJSON_Object, Asset &pAsset_Root) {
+    /****************** Mesh primitives ******************/
+    Value *curPrimitives = FindArray(pJSON_Object, "primitives");
+    if (nullptr != curPrimitives) {
+        this->primitives.resize(curPrimitives->Size());
+        for (unsigned int i = 0; i < curPrimitives->Size(); ++i) {
+            Value &primitive = (*curPrimitives)[i];
+
+            Primitive &prim = this->primitives[i];
+            prim.mode = MemberOrDefault(primitive, "mode", PrimitiveMode_TRIANGLES);
+
+            if (Value *attrs = FindObject(primitive, "attributes")) {
+                for (Value::MemberIterator it = attrs->MemberBegin(); it != attrs->MemberEnd(); ++it) {
+                    if (!it->value.IsString()) continue;
+                    const char *attr = it->name.GetString();
+                    // Valid attribute semantics include POSITION, NORMAL, TEXCOORD, COLOR, JOINT, JOINTMATRIX,
+                    // and WEIGHT.Attribute semantics can be of the form[semantic]_[set_index], e.g., TEXCOORD_0, TEXCOORD_1, etc.
+
+                    int undPos = 0;
+                    Mesh::AccessorList *vec = 0;
+                    if (GetAttribVector(prim, attr, vec, undPos)) {
+                        size_t idx = (attr[undPos] == '_') ? atoi(attr + undPos + 1) : 0;
+                        if ((*vec).size() <= idx) (*vec).resize(idx + 1);
+                        (*vec)[idx] = pAsset_Root.accessors.Get(it->value.GetString());
+                    }
+                }
+            }
+
+            if (Value *indices = FindString(primitive, "indices")) {
+                prim.indices = pAsset_Root.accessors.Get(indices->GetString());
+            }
+
+            if (Value *material = FindString(primitive, "material")) {
+                prim.material = pAsset_Root.materials.Get(material->GetString());
+            }
+        }
+    }
+
+    /****************** Mesh extensions ******************/
+    Value *json_extensions = FindObject(pJSON_Object, "extensions");
+
+    if (json_extensions == nullptr) goto mr_skip_extensions;
+
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+    for (Value::MemberIterator it_memb = json_extensions->MemberBegin(); it_memb != json_extensions->MemberEnd(); it_memb++) {
+        if (it_memb->name.GetString() == std::string("Open3DGC-compression")) {
+            // Search for compressed data.
+            // Compressed data contain description of part of "buffer" which is encoded. This part must be decoded and
+            // new data will replace old encoded part by request. In fact \"compressedData\" is kind of "accessor" structure.
+            Value *comp_data = FindObject(it_memb->value, "compressedData");
+
+            if (comp_data == nullptr) throw DeadlyImportError("GLTF: \"Open3DGC-compression\" must has \"compressedData\".");
+
+            ASSIMP_LOG_INFO("GLTF: Decompressing Open3DGC data.");
+
+/************** Read data from JSON-document **************/
+#define MESH_READ_COMPRESSEDDATA_MEMBER(pFieldName, pOut)                                   \
+    if (!ReadMember(*comp_data, pFieldName, pOut)) {                                        \
+        throw DeadlyImportError("GLTF: \"compressedData\" must has \"", pFieldName, "\"."); \
+    }
+
+            const char *mode_str;
+            const char *type_str;
+            ComponentType component_type;
+            SCompression_Open3DGC *ext_o3dgc = new SCompression_Open3DGC;
+
+            MESH_READ_COMPRESSEDDATA_MEMBER("buffer", ext_o3dgc->Buffer);
+            MESH_READ_COMPRESSEDDATA_MEMBER("byteOffset", ext_o3dgc->Offset);
+            MESH_READ_COMPRESSEDDATA_MEMBER("componentType", component_type);
+            MESH_READ_COMPRESSEDDATA_MEMBER("type", type_str);
+            MESH_READ_COMPRESSEDDATA_MEMBER("count", ext_o3dgc->Count);
+            MESH_READ_COMPRESSEDDATA_MEMBER("mode", mode_str);
+            MESH_READ_COMPRESSEDDATA_MEMBER("indicesCount", ext_o3dgc->IndicesCount);
+            MESH_READ_COMPRESSEDDATA_MEMBER("verticesCount", ext_o3dgc->VerticesCount);
+
+#undef MESH_READ_COMPRESSEDDATA_MEMBER
+
+            // Check some values
+            if (strcmp(type_str, "SCALAR")) throw DeadlyImportError("GLTF: only \"SCALAR\" type is supported for compressed data.");
+            if (component_type != ComponentType_UNSIGNED_BYTE) throw DeadlyImportError("GLTF: only \"UNSIGNED_BYTE\" component type is supported for compressed data.");
+
+            // Set read/write data mode.
+            if (strcmp(mode_str, "binary") == 0)
+                ext_o3dgc->Binary = true;
+            else if (strcmp(mode_str, "ascii") == 0)
+                ext_o3dgc->Binary = false;
+            else
+                throw DeadlyImportError("GLTF: for compressed data supported modes is: \"ascii\", \"binary\". Not the: \"", mode_str, "\".");
+
+            /************************ Decoding ************************/
+            Decode_O3DGC(*ext_o3dgc, pAsset_Root);
+            Extension.push_back(ext_o3dgc); // store info in mesh extensions list.
+        } // if(it_memb->name.GetString() == "Open3DGC-compression")
+        else {
+            throw DeadlyImportError("GLTF: Unknown mesh extension: \"", it_memb->name.GetString(), "\".");
+        }
+    } // for(Value::MemberIterator it_memb = json_extensions->MemberBegin(); it_memb != json_extensions->MemberEnd(); json_extensions++)
+#endif
+
+mr_skip_extensions:
+
+    return; // After label some operators must be present.
+}
+
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+inline void Mesh::Decode_O3DGC(const SCompression_Open3DGC &pCompression_Open3DGC, Asset &pAsset_Root) {
+    typedef unsigned short IndicesType; ///< \sa glTFExporter::ExportMeshes.
+
+    o3dgc::SC3DMCDecoder<IndicesType> decoder;
+    o3dgc::IndexedFaceSet<IndicesType> ifs;
+    o3dgc::BinaryStream bstream;
+    uint8_t *decoded_data;
+    size_t decoded_data_size = 0;
+    Ref<Buffer> buf = pAsset_Root.buffers.Get(pCompression_Open3DGC.Buffer);
+
+    // Read data from buffer and place it in BinaryStream for decoder.
+    // Just "Count" because always is used type equivalent to uint8_t.
+    bstream.LoadFromBuffer(&buf->GetPointer()[pCompression_Open3DGC.Offset], static_cast<unsigned long>(pCompression_Open3DGC.Count));
+
+    // After decoding header we can get size of primitives.
+    if (decoder.DecodeHeader(ifs, bstream) != o3dgc::O3DGC_OK) throw DeadlyImportError("GLTF: can not decode Open3DGC header.");
+
+    /****************** Get sizes of arrays and check sizes ******************/
+    // Note. See "Limitations for meshes when using Open3DGC-compression".
+
+    // Indices
+    size_t size_coordindex = ifs.GetNCoordIndex() * 3; // See float attributes note.
+
+    if (primitives[0].indices->count != size_coordindex)
+        throw DeadlyImportError("GLTF: Open3DGC. Compressed indices count (", ai_to_string(size_coordindex),
+                ") not equal to uncompressed (", ai_to_string(primitives[0].indices->count), ").");
+
+    size_coordindex *= sizeof(IndicesType);
+    // Coordinates
+    size_t size_coord = ifs.GetNCoord(); // See float attributes note.
+
+    if (primitives[0].attributes.position[0]->count != size_coord)
+        throw DeadlyImportError("GLTF: Open3DGC. Compressed positions count (", ai_to_string(size_coord),
+                ") not equal to uncompressed (", ai_to_string(primitives[0].attributes.position[0]->count), ").");
+
+    size_coord *= 3 * sizeof(float);
+    // Normals
+    size_t size_normal = ifs.GetNNormal(); // See float attributes note.
+
+    if (primitives[0].attributes.normal[0]->count != size_normal)
+        throw DeadlyImportError("GLTF: Open3DGC. Compressed normals count (", ai_to_string(size_normal),
+                ") not equal to uncompressed (", ai_to_string(primitives[0].attributes.normal[0]->count), ").");
+
+    size_normal *= 3 * sizeof(float);
+    // Additional attributes.
+    std::vector<size_t> size_floatattr;
+    std::vector<size_t> size_intattr;
+
+    size_floatattr.resize(ifs.GetNumFloatAttributes());
+    size_intattr.resize(ifs.GetNumIntAttributes());
+
+    decoded_data_size = size_coordindex + size_coord + size_normal;
+    for (size_t idx = 0, idx_end = size_floatattr.size(), idx_texcoord = 0; idx < idx_end; idx++) {
+        // size = number_of_elements * components_per_element * size_of_component.
+        // Note. But as you can see above, at first we are use this variable in meaning "count". After checking count of objects...
+        size_t tval = ifs.GetNFloatAttribute(static_cast<unsigned long>(idx));
+
+        switch (ifs.GetFloatAttributeType(static_cast<unsigned long>(idx))) {
+        case o3dgc::O3DGC_IFS_FLOAT_ATTRIBUTE_TYPE_TEXCOORD:
+            // Check situation when encoded data contain texture coordinates but primitive not.
+            if (idx_texcoord < primitives[0].attributes.texcoord.size()) {
+                if (primitives[0].attributes.texcoord[idx]->count != tval)
+                    throw DeadlyImportError("GLTF: Open3DGC. Compressed texture coordinates count (", ai_to_string(tval),
+                            ") not equal to uncompressed (", ai_to_string(primitives[0].attributes.texcoord[idx]->count), ").");
+
+                idx_texcoord++;
+            } else {
+                ifs.SetNFloatAttribute(static_cast<unsigned long>(idx), 0ul); // Disable decoding this attribute.
+            }
+
+            break;
+        default:
+            throw DeadlyImportError("GLTF: Open3DGC. Unsupported type of float attribute: ", ai_to_string(ifs.GetFloatAttributeType(static_cast<unsigned long>(idx))));
+        }
+
+        tval *= ifs.GetFloatAttributeDim(static_cast<unsigned long>(idx)) * sizeof(o3dgc::Real); // After checking count of objects we can get size of array.
+        size_floatattr[idx] = tval;
+        decoded_data_size += tval;
+    }
+
+    for (size_t idx = 0, idx_end = size_intattr.size(); idx < idx_end; idx++) {
+        // size = number_of_elements * components_per_element * size_of_component. See float attributes note.
+        size_t tval = ifs.GetNIntAttribute(static_cast<unsigned long>(idx));
+        switch (ifs.GetIntAttributeType(static_cast<unsigned long>(idx))) {
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_UNKOWN:
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_INDEX:
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_JOINT_ID:
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_INDEX_BUFFER_ID:
+            break;
+
+        default:
+            throw DeadlyImportError("GLTF: Open3DGC. Unsupported type of int attribute: ", ai_to_string(ifs.GetIntAttributeType(static_cast<unsigned long>(idx))));
+        }
+
+        tval *= ifs.GetIntAttributeDim(static_cast<unsigned long>(idx)) * sizeof(long); // See float attributes note.
+        size_intattr[idx] = tval;
+        decoded_data_size += tval;
+    }
+
+    // Create array for decoded data.
+    decoded_data = new uint8_t[decoded_data_size];
+
+    /****************** Set right array regions for decoder ******************/
+
+    auto get_buf_offset = [](Ref<Accessor> &pAccessor) -> size_t { return pAccessor->byteOffset + pAccessor->bufferView->byteOffset; };
+
+    // Indices
+    ifs.SetCoordIndex((IndicesType *const)(decoded_data + get_buf_offset(primitives[0].indices)));
+    // Coordinates
+    ifs.SetCoord((o3dgc::Real *const)(decoded_data + get_buf_offset(primitives[0].attributes.position[0])));
+    // Normals
+    if (size_normal) {
+        ifs.SetNormal((o3dgc::Real *const)(decoded_data + get_buf_offset(primitives[0].attributes.normal[0])));
+    }
+
+    for (size_t idx = 0, idx_end = size_floatattr.size(), idx_texcoord = 0; idx < idx_end; idx++) {
+        switch (ifs.GetFloatAttributeType(static_cast<unsigned long>(idx))) {
+        case o3dgc::O3DGC_IFS_FLOAT_ATTRIBUTE_TYPE_TEXCOORD:
+            if (idx_texcoord < primitives[0].attributes.texcoord.size()) {
+                // See above about absent attributes.
+                ifs.SetFloatAttribute(static_cast<unsigned long>(idx), (o3dgc::Real *const)(decoded_data + get_buf_offset(primitives[0].attributes.texcoord[idx])));
+                idx_texcoord++;
+            }
+
+            break;
+        default:
+            throw DeadlyImportError("GLTF: Open3DGC. Unsupported type of float attribute: ", ai_to_string(ifs.GetFloatAttributeType(static_cast<unsigned long>(idx))));
+        }
+    }
+
+    for (size_t idx = 0, idx_end = size_intattr.size(); idx < idx_end; idx++) {
+        switch (ifs.GetIntAttributeType(static_cast<unsigned int>(idx))) {
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_UNKOWN:
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_INDEX:
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_JOINT_ID:
+        case o3dgc::O3DGC_IFS_INT_ATTRIBUTE_TYPE_INDEX_BUFFER_ID:
+            break;
+
+        // ifs.SetIntAttribute(idx, (long* const)(decoded_data + get_buf_offset(primitives[0].attributes.joint)));
+        default:
+            throw DeadlyImportError("GLTF: Open3DGC. Unsupported type of int attribute: ", ai_to_string(ifs.GetIntAttributeType(static_cast<unsigned long>(idx))));
+        }
+    }
+
+    //
+    // Decode data
+    //
+    if (decoder.DecodePayload(ifs, bstream) != o3dgc::O3DGC_OK) {
+        throw DeadlyImportError("GLTF: can not decode Open3DGC data.");
+    }
+
+    // Set encoded region for "buffer".
+    buf->EncodedRegion_Mark(pCompression_Open3DGC.Offset, pCompression_Open3DGC.Count, decoded_data, decoded_data_size, id);
+    // No. Do not delete "output_data". After calling "EncodedRegion_Mark" bufferView is owner of "output_data".
+    // "delete [] output_data;"
+}
+#endif
+
+inline void Camera::Read(Value &obj, Asset & /*r*/) {
+    type = MemberOrDefault(obj, "type", Camera::Perspective);
+
+    const char *subobjId = (type == Camera::Orthographic) ? "orthographic" : "perspective";
+
+    Value *it = FindObject(obj, subobjId);
+    if (!it) throw DeadlyImportError("GLTF: Camera missing its parameters");
+
+    if (type == Camera::Perspective) {
+        perspective.aspectRatio = MemberOrDefault(*it, "aspectRatio", 0.f);
+        perspective.yfov = MemberOrDefault(*it, "yfov", 3.1415f / 2.f);
+        perspective.zfar = MemberOrDefault(*it, "zfar", 100.f);
+        perspective.znear = MemberOrDefault(*it, "znear", 0.01f);
+    } else {
+        ortographic.xmag = MemberOrDefault(*it, "xmag", 1.f);
+        ortographic.ymag = MemberOrDefault(*it, "ymag", 1.f);
+        ortographic.zfar = MemberOrDefault(*it, "zfar", 100.f);
+        ortographic.znear = MemberOrDefault(*it, "znear", 0.01f);
+    }
+}
+
+inline void Light::Read(Value &obj, Asset & /*r*/) {
+    SetDefaults();
+
+    Value *curType = FindString(obj, "type");
+    if (nullptr != curType) {
+        const char *t = curType->GetString();
+        if (strcmp(t, "ambient") == 0)
+            this->type = Type_ambient;
+        else if (strcmp(t, "directional") == 0)
+            this->type = Type_directional;
+        else if (strcmp(t, "point") == 0)
+            this->type = Type_point;
+        else if (strcmp(t, "spot") == 0)
+            this->type = Type_spot;
+
+        if (this->type != Type_undefined) {
+            if (Value *vals = FindString(obj, t)) {
+                ReadMember(*vals, "color", color);
+
+                ReadMember(*vals, "constantAttenuation", constantAttenuation);
+                ReadMember(*vals, "linearAttenuation", linearAttenuation);
+                ReadMember(*vals, "quadraticAttenuation", quadraticAttenuation);
+                ReadMember(*vals, "distance", distance);
+
+                ReadMember(*vals, "falloffAngle", falloffAngle);
+                ReadMember(*vals, "falloffExponent", falloffExponent);
+            }
+        }
+    }
+}
+
+inline void Light::SetDefaults() {
+#ifndef M_PI
+    const float M_PI = 3.14159265358979323846f;
+#endif
+
+    type = Type_undefined;
+
+    SetVector(color, 0.f, 0.f, 0.f, 1.f);
+
+    constantAttenuation = 0.f;
+    linearAttenuation = 1.f;
+    quadraticAttenuation = 1.f;
+    distance = 0.f;
+
+    falloffAngle = static_cast<float>(M_PI / 2.f);
+    falloffExponent = 0.f;
+}
+
+inline void Node::Read(Value &obj, Asset &r) {
+    if (name.empty()) {
+        name = id;
+    }
+
+    Value *curChildren = FindArray(obj, "children");
+    if (nullptr != curChildren) {
+        this->children.reserve(curChildren->Size());
+        for (unsigned int i = 0; i < curChildren->Size(); ++i) {
+            Value &child = (*curChildren)[i];
+            if (child.IsString()) {
+                // get/create the child node
+                Ref<Node> chn = r.nodes.Get(child.GetString());
+                if (chn) this->children.push_back(chn);
+            }
+        }
+    }
+
+    Value *curMatrix = FindArray(obj, "matrix");
+    if (nullptr != curMatrix) {
+        ReadValue(*curMatrix, this->matrix);
+    } else {
+        ReadMember(obj, "translation", translation);
+        ReadMember(obj, "scale", scale);
+        ReadMember(obj, "rotation", rotation);
+    }
+
+    Value *curMeshes = FindArray(obj, "meshes");
+    if (nullptr != curMeshes) {
+        unsigned int numMeshes = (unsigned int)curMeshes->Size();
+
+        std::vector<unsigned int> meshList;
+
+        this->meshes.reserve(numMeshes);
+        for (unsigned i = 0; i < numMeshes; ++i) {
+            if ((*curMeshes)[i].IsString()) {
+                Ref<Mesh> mesh = r.meshes.Get((*curMeshes)[i].GetString());
+                if (mesh) {
+                    this->meshes.push_back(mesh);
+                }
+            }
+        }
+    }
+
+    Value *curCamera = FindString(obj, "camera");
+    if (nullptr != curCamera) {
+        this->camera = r.cameras.Get(curCamera->GetString());
+        if (this->camera) {
+            this->camera->id = this->id;
+        }
+    }
+
+    // TODO load "skeletons", "skin", "jointName"
+
+    if (Value *extensions = FindObject(obj, "extensions")) {
+        if (r.extensionsUsed.KHR_materials_common) {
+
+            if (Value *ext = FindObject(*extensions, "KHR_materials_common")) {
+                Value *curLight = FindString(*ext, "light");
+                if (nullptr != curLight) {
+                    this->light = r.lights.Get(curLight->GetString());
+                }
+            }
+        }
+    }
+}
+
+inline void Scene::Read(Value &obj, Asset &r) {
+    if (Value *array = FindArray(obj, "nodes")) {
+        for (unsigned int i = 0; i < array->Size(); ++i) {
+            if (!(*array)[i].IsString()) continue;
+            Ref<Node> node = r.nodes.Get((*array)[i].GetString());
+            if (node)
+                this->nodes.push_back(node);
+        }
+    }
+}
+
+inline void AssetMetadata::Read(Document &doc) {
+    // read the version, etc.
+    if (Value *obj = FindObject(doc, "asset")) {
+        ReadMember(*obj, "copyright", copyright);
+        ReadMember(*obj, "generator", generator);
+
+        premultipliedAlpha = MemberOrDefault(*obj, "premultipliedAlpha", false);
+
+        if (Value *versionString = FindString(*obj, "version")) {
+            version = versionString->GetString();
+        } else if (Value *versionNumber = FindNumber(*obj, "version")) {
+            char buf[4];
+
+            ai_snprintf(buf, 4, "%.1f", versionNumber->GetDouble());
+
+            version = buf;
+        }
+
+        Value *curProfile = FindObject(*obj, "profile");
+        if (nullptr != curProfile) {
+            ReadMember(*curProfile, "api", this->profile.api);
+            ReadMember(*curProfile, "version", this->profile.version);
+        }
+    }
+
+    if (version.empty() || version[0] != '1') {
+        throw DeadlyImportError("GLTF: Unsupported glTF version: ", version);
+    }
+}
+
+//
+// Asset methods implementation
+//
+
+inline void Asset::ReadBinaryHeader(IOStream &stream) {
+    GLB_Header header;
+    if (stream.Read(&header, sizeof(header), 1) != 1) {
+        throw DeadlyImportError("GLTF: Unable to read the file header");
+    }
+
+    if (strncmp((char *)header.magic, AI_GLB_MAGIC_NUMBER, sizeof(header.magic)) != 0) {
+        throw DeadlyImportError("GLTF: Invalid binary glTF file");
+    }
+
+    AI_SWAP4(header.version);
+    asset.version = ai_to_string(header.version);
+    if (header.version != 1) {
+        throw DeadlyImportError("GLTF: Unsupported binary glTF version");
+    }
+
+    AI_SWAP4(header.sceneFormat);
+    if (header.sceneFormat != SceneFormat_JSON) {
+        throw DeadlyImportError("GLTF: Unsupported binary glTF scene format");
+    }
+
+    AI_SWAP4(header.length);
+    AI_SWAP4(header.sceneLength);
+
+    static_assert(std::numeric_limits<uint32_t>::max() <= std::numeric_limits<size_t>::max(), "size_t must be at least 32bits");
+    mSceneLength = static_cast<size_t>(header.sceneLength); // Can't be larger than 4GB (max. uint32_t)
+
+    mBodyOffset = sizeof(header) + mSceneLength;
+    mBodyOffset = (mBodyOffset + 3) & ~3; // Round up to next multiple of 4
+
+    mBodyLength = header.length - mBodyOffset;
+}
+
+inline void Asset::Load(const std::string &pFile, bool isBinary) {
+    mCurrentAssetDir.clear();
+
+    /*int pos = std::max(int(pFile.rfind('/')), int(pFile.rfind('\\')));
+    if (pos != int(std::string::npos)) mCurrentAssetDir = pFile.substr(0, pos + 1);*/
+    if (0 != strncmp(pFile.c_str(), AI_MEMORYIO_MAGIC_FILENAME, AI_MEMORYIO_MAGIC_FILENAME_LENGTH)) {
+        mCurrentAssetDir = getCurrentAssetDir(pFile);
+    }
+
+    shared_ptr<IOStream> stream(OpenFile(pFile.c_str(), "rb", true));
+    if (!stream) {
+        throw DeadlyImportError("GLTF: Could not open file for reading");
+    }
+
+    // is binary? then read the header
+    if (isBinary) {
+        SetAsBinary(); // also creates the body buffer
+        ReadBinaryHeader(*stream);
+    } else {
+        mSceneLength = stream->FileSize();
+        mBodyLength = 0;
+    }
+
+    // Smallest legal JSON file is "{}" Smallest loadable glTF file is larger than that but catch it later
+    if (mSceneLength < 2) {
+        throw DeadlyImportError("GLTF: No JSON file contents");
+    }
+
+    // Binary format only supports up to 4GB of JSON so limit it there to avoid extreme memory allocation
+    if (mSceneLength >= std::numeric_limits<uint32_t>::max()) {
+        throw DeadlyImportError("GLTF: JSON size greater than 4GB");
+    }
+
+    // read the scene data, ensure null termination
+    std::vector<char> sceneData(mSceneLength + 1);
+    sceneData[mSceneLength] = '\0';
+
+    if (stream->Read(&sceneData[0], 1, mSceneLength) != mSceneLength) {
+        throw DeadlyImportError("GLTF: Could not read the file contents");
+    }
+
+    // parse the JSON document
+
+    Document doc;
+    doc.ParseInsitu(&sceneData[0]);
+
+    if (doc.HasParseError()) {
+        char buffer[32];
+        ai_snprintf(buffer, 32, "%d", static_cast<int>(doc.GetErrorOffset()));
+        throw DeadlyImportError("GLTF: JSON parse error, offset ", buffer, ": ", GetParseError_En(doc.GetParseError()));
+    }
+
+    if (!doc.IsObject()) {
+        throw DeadlyImportError("GLTF: JSON document root must be a JSON object");
+    }
+
+    // Fill the buffer instance for the current file embedded contents
+    if (mBodyLength > 0) {
+        if (!mBodyBuffer->LoadFromStream(*stream, mBodyLength, mBodyOffset)) {
+            throw DeadlyImportError("GLTF: Unable to read gltf file");
+        }
+    }
+
+    // Load the metadata
+    asset.Read(doc);
+    ReadExtensionsUsed(doc);
+
+    // Prepare the dictionaries
+    for (size_t i = 0; i < mDicts.size(); ++i) {
+        mDicts[i]->AttachToDocument(doc);
+    }
+
+    // Read the "scene" property, which specifies which scene to load
+    // and recursively load everything referenced by it
+    Value *curScene = FindString(doc, "scene");
+    if (nullptr != curScene) {
+        this->scene = scenes.Get(curScene->GetString());
+    }
+
+    // Clean up
+    for (size_t i = 0; i < mDicts.size(); ++i) {
+        mDicts[i]->DetachFromDocument();
+    }
+}
+
+inline void Asset::SetAsBinary() {
+    if (!extensionsUsed.KHR_binary_glTF) {
+        extensionsUsed.KHR_binary_glTF = true;
+        mBodyBuffer = buffers.Create("binary_glTF");
+        mBodyBuffer->MarkAsSpecial();
+    }
+}
+
+inline void Asset::ReadExtensionsUsed(Document &doc) {
+    Value *extsUsed = FindArray(doc, "extensionsUsed");
+    if (!extsUsed) return;
+
+    std::gltf_unordered_map<std::string, bool> exts;
+
+    for (unsigned int i = 0; i < extsUsed->Size(); ++i) {
+        if ((*extsUsed)[i].IsString()) {
+            exts[(*extsUsed)[i].GetString()] = true;
+        }
+    }
+
+    CHECK_EXT(KHR_binary_glTF);
+    CHECK_EXT(KHR_materials_common);
+
+#undef CHECK_EXT
+}
+
+inline IOStream *Asset::OpenFile(const std::string &path, const char *mode, bool absolute) {
+#ifdef ASSIMP_API
+    (void)absolute;
+    return mIOSystem->Open(path, mode);
+#else
+    if (path.size() < 2) return 0;
+    if (!absolute && path[1] != ':' && path[0] != '/') { // relative?
+        path = mCurrentAssetDir + path;
+    }
+    FILE *f = fopen(path.c_str(), mode);
+    return f ? new IOStream(f) : 0;
+#endif
+}
+
+inline std::string Asset::FindUniqueID(const std::string &str, const char *suffix) {
+    std::string id = str;
+
+    if (!id.empty()) {
+        if (mUsedIds.find(id) == mUsedIds.end())
+            return id;
+
+        id += "_";
+    }
+
+    id += suffix;
+
+    Asset::IdMap::iterator it = mUsedIds.find(id);
+    if (it == mUsedIds.end())
+        return id;
+
+    char buffer[1024];
+    int offset = ai_snprintf(buffer, sizeof(buffer), "%s_", id.c_str());
+    for (int i = 0; it != mUsedIds.end(); ++i) {
+        ai_snprintf(buffer + offset, sizeof(buffer) - offset, "%d", i);
+        id = buffer;
+        it = mUsedIds.find(id);
+    }
+
+    return id;
+}
+
+#if _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
+
+} // namespace glTF
diff --git a/libs/assimp/code/AssetLib/glTF/glTFAssetWriter.h b/libs/assimp/code/AssetLib/glTF/glTFAssetWriter.h
new file mode 100644
index 0000000..6dbc424
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFAssetWriter.h
@@ -0,0 +1,96 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+/** @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);
+
+private:
+
+    void WriteBinaryData(IOStream* outfile, size_t sceneLength);
+
+    void WriteMetadata();
+    void WriteExtensionsUsed();
+
+    template<class T>
+    void WriteObjects(LazyDict<T>& d);
+
+public:
+    Document mDoc;
+    Asset& mAsset;
+
+    MemoryPoolAllocator<>& mAl;
+
+    AssetWriter(Asset& asset);
+
+    void WriteFile(const char* path);
+    void WriteGLBFile(const char* path);
+};
+
+}
+
+// Include the implementation of the methods
+#include "glTFAssetWriter.inl"
+
+#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER
+
+#endif // GLTFASSETWRITER_H_INC
diff --git a/libs/assimp/code/AssetLib/glTF/glTFAssetWriter.inl b/libs/assimp/code/AssetLib/glTF/glTFAssetWriter.inl
new file mode 100644
index 0000000..a1265fb
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFAssetWriter.inl
@@ -0,0 +1,716 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+#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 == 0) {
+            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 == 0) {
+                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 == 0) {
+            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
+
+}
diff --git a/libs/assimp/code/AssetLib/glTF/glTFCommon.cpp b/libs/assimp/code/AssetLib/glTF/glTFCommon.cpp
new file mode 100644
index 0000000..fea680c
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFCommon.cpp
@@ -0,0 +1,117 @@
+/*
+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_GLTF_IMPORTER
+
+#include "AssetLib/glTF/glTFCommon.h"
+
+namespace glTFCommon {
+
+using namespace glTFCommon::Util;
+
+namespace Util {
+
+bool ParseDataURI(const char *const_uri, size_t uriLen, DataURI &out) {
+    if (nullptr == const_uri) {
+        return false;
+    }
+
+    if (const_uri[0] != 0x10) { // we already parsed this uri?
+        if (strncmp(const_uri, "data:", 5) != 0) // not a data uri?
+            return false;
+    }
+
+    // set defaults
+    out.mediaType = "text/plain";
+    out.charset = "US-ASCII";
+    out.base64 = false;
+
+    char *uri = const_cast<char *>(const_uri);
+    if (uri[0] != 0x10) {
+        uri[0] = 0x10;
+        uri[1] = uri[2] = uri[3] = uri[4] = 0;
+
+        size_t i = 5, j;
+        if (uri[i] != ';' && uri[i] != ',') { // has media type?
+            uri[1] = char(i);
+            for (;i < uriLen && uri[i] != ';' && uri[i] != ','; ++i) {
+                // nothing to do!
+            }
+        }
+        while (i < uriLen && uri[i] == ';') {
+            uri[i++] = '\0';
+            for (j = i; i < uriLen && uri[i] != ';' && uri[i] != ','; ++i) {
+                // nothing to do!
+            }
+
+            if (strncmp(uri + j, "charset=", 8) == 0) {
+                uri[2] = char(j + 8);
+            } else if (strncmp(uri + j, "base64", 6) == 0) {
+                uri[3] = char(j);
+            }
+        }
+        if (i < uriLen) {
+            uri[i++] = '\0';
+            uri[4] = char(i);
+        } else {
+            uri[1] = uri[2] = uri[3] = 0;
+            uri[4] = 5;
+        }
+    }
+
+    if (uri[1] != 0) {
+        out.mediaType = uri + uri[1];
+    }
+    if (uri[2] != 0) {
+        out.charset = uri + uri[2];
+    }
+    if (uri[3] != 0) {
+        out.base64 = true;
+    }
+    out.data = uri + uri[4];
+    out.dataLength = (uri + uriLen) - out.data;
+
+    return true;
+}
+
+} // namespace Util
+} // namespace glTFCommon
+
+#endif
diff --git a/libs/assimp/code/AssetLib/glTF/glTFCommon.h b/libs/assimp/code/AssetLib/glTF/glTFCommon.h
new file mode 100644
index 0000000..edc3c7e
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFCommon.h
@@ -0,0 +1,520 @@
+/*
+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 AI_GLFTCOMMON_H_INC
+#define AI_GLFTCOMMON_H_INC
+
+#ifndef ASSIMP_BUILD_NO_GLTF_IMPORTER
+
+#include <assimp/Exceptional.h>
+
+#include <algorithm>
+#include <list>
+#include <map>
+#include <stdexcept>
+#include <string>
+#include <vector>
+
+#include <rapidjson/document.h>
+#include <rapidjson/error/en.h>
+#include <rapidjson/rapidjson.h>
+
+// clang-format off
+
+#ifdef ASSIMP_API
+#   include <assimp/ByteSwapper.h>
+#   include <assimp/DefaultIOSystem.h>
+#   include <memory>
+#else
+#   include <memory>
+#   define AI_SWAP4(p)
+#   define ai_assert
+#endif
+
+#if _MSC_VER > 1500 || (defined __GNUC___)
+#   define ASSIMP_GLTF_USE_UNORDERED_MULTIMAP
+#else
+#   define gltf_unordered_map map
+#endif
+
+#ifdef ASSIMP_GLTF_USE_UNORDERED_MULTIMAP
+#   include <unordered_map>
+#   if defined(_MSC_VER) && _MSC_VER <= 1600
+#       define gltf_unordered_map tr1::unordered_map
+#   else
+#       define gltf_unordered_map unordered_map
+#   endif
+#endif
+// clang-format on
+
+
+namespace glTFCommon {
+
+using rapidjson::Document;
+using rapidjson::Value;
+
+#ifdef ASSIMP_API
+using Assimp::IOStream;
+using Assimp::IOSystem;
+using std::shared_ptr;
+#else
+using std::shared_ptr;
+
+typedef std::runtime_error DeadlyImportError;
+typedef std::runtime_error DeadlyExportError;
+
+enum aiOrigin {
+    aiOrigin_SET = 0,
+    aiOrigin_CUR = 1,
+    aiOrigin_END = 2
+};
+
+class IOSystem;
+
+class IOStream {
+public:
+    IOStream(FILE *file) :
+            f(file) {}
+    ~IOStream() {
+        fclose(f);
+    }
+
+    size_t Read(void *b, size_t sz, size_t n) { return fread(b, sz, n, f); }
+    size_t Write(const void *b, size_t sz, size_t n) { return fwrite(b, sz, n, f); }
+    int Seek(size_t off, aiOrigin orig) { return fseek(f, off, int(orig)); }
+    size_t Tell() const { return ftell(f); }
+
+    size_t FileSize() {
+        long p = Tell(), len = (Seek(0, aiOrigin_END), Tell());
+        return size_t((Seek(p, aiOrigin_SET), len));
+    }
+
+private:
+    FILE *f;
+};
+#endif
+
+// Vec/matrix types, as raw float arrays
+typedef float(vec3)[3];
+typedef float(vec4)[4];
+typedef float(mat4)[16];
+
+inline void CopyValue(const glTFCommon::vec3 &v, aiColor4D &out) {
+    out.r = v[0];
+    out.g = v[1];
+    out.b = v[2];
+    out.a = 1.0;
+}
+
+inline void CopyValue(const glTFCommon::vec4 &v, aiColor4D &out) {
+    out.r = v[0];
+    out.g = v[1];
+    out.b = v[2];
+    out.a = v[3];
+}
+
+inline void CopyValue(const glTFCommon::vec4 &v, aiColor3D &out) {
+    out.r = v[0];
+    out.g = v[1];
+    out.b = v[2];
+}
+
+inline void CopyValue(const glTFCommon::vec3 &v, aiColor3D &out) {
+    out.r = v[0];
+    out.g = v[1];
+    out.b = v[2];
+}
+
+inline void CopyValue(const glTFCommon::vec3 &v, aiVector3D &out) {
+    out.x = v[0];
+    out.y = v[1];
+    out.z = v[2];
+}
+
+inline void CopyValue(const glTFCommon::vec4 &v, aiQuaternion &out) {
+    out.x = v[0];
+    out.y = v[1];
+    out.z = v[2];
+    out.w = v[3];
+}
+
+inline void CopyValue(const glTFCommon::mat4 &v, aiMatrix4x4 &o) {
+    o.a1 = v[0];
+    o.b1 = v[1];
+    o.c1 = v[2];
+    o.d1 = v[3];
+    o.a2 = v[4];
+    o.b2 = v[5];
+    o.c2 = v[6];
+    o.d2 = v[7];
+    o.a3 = v[8];
+    o.b3 = v[9];
+    o.c3 = v[10];
+    o.d3 = v[11];
+    o.a4 = v[12];
+    o.b4 = v[13];
+    o.c4 = v[14];
+    o.d4 = v[15];
+}
+
+#if _MSC_VER
+#    pragma warning(push)
+#    pragma warning(disable : 4310)
+#endif // _MSC_VER
+
+inline std::string getCurrentAssetDir(const std::string &pFile) {
+    int pos = std::max(int(pFile.rfind('/')), int(pFile.rfind('\\')));
+    if (pos == int(std::string::npos)) {
+        return std::string();
+    }
+
+    return pFile.substr(0, pos + 1);
+}
+#if _MSC_VER
+#    pragma warning(pop)
+#endif // _MSC_VER
+
+namespace Util {
+
+void EncodeBase64(const uint8_t *in, size_t inLength, std::string &out);
+
+size_t DecodeBase64(const char *in, size_t inLength, uint8_t *&out);
+
+inline size_t DecodeBase64(const char *in, uint8_t *&out) {
+    return DecodeBase64(in, strlen(in), out);
+}
+
+struct DataURI {
+    const char *mediaType;
+    const char *charset;
+    bool base64;
+    const char *data;
+    size_t dataLength;
+};
+
+//! Check if a uri is a data URI
+bool ParseDataURI(const char *const_uri, size_t uriLen, DataURI &out);
+
+} // namespace Util
+
+#define CHECK_EXT(EXT) \
+    if (exts.find(#EXT) != exts.end()) extensionsUsed.EXT = true;
+
+//! Helper struct to represent values that might not be present
+template <class T>
+struct Nullable {
+    T value;
+    bool isPresent;
+
+    Nullable() :
+            isPresent(false) {}
+    Nullable(T &val) :
+            value(val),
+            isPresent(true) {}
+};
+
+//! A reference to one top-level object, which is valid
+//! until the Asset instance is destroyed
+template <class T>
+class Ref {
+    std::vector<T *> *vector;
+    unsigned int index;
+
+public:
+    Ref() :
+            vector(0),
+            index(0) {}
+    Ref(std::vector<T *> &vec, unsigned int idx) :
+            vector(&vec),
+            index(idx) {}
+
+    inline unsigned int GetIndex() const { return index; }
+
+    operator bool() const { return vector != nullptr && index < vector->size(); }
+
+    T *operator->() { return (*vector)[index]; }
+
+    T &operator*() { return *((*vector)[index]); }
+};
+
+//
+// JSON Value reading helpers
+//
+
+template <class T>
+struct ReadHelper {
+    static bool Read(Value &val, T &out) {
+        return val.IsInt() ? out = static_cast<T>(val.GetInt()), true : false;
+    }
+};
+
+template <>
+struct ReadHelper<bool> {
+    static bool Read(Value &val, bool &out) {
+        return val.IsBool() ? out = val.GetBool(), true : false;
+    }
+};
+
+template <>
+struct ReadHelper<float> {
+    static bool Read(Value &val, float &out) {
+        return val.IsNumber() ? out = static_cast<float>(val.GetDouble()), true : false;
+    }
+};
+
+template <unsigned int N>
+struct ReadHelper<float[N]> {
+    static bool Read(Value &val, float (&out)[N]) {
+        if (!val.IsArray() || val.Size() != N) return false;
+        for (unsigned int i = 0; i < N; ++i) {
+            if (val[i].IsNumber())
+                out[i] = static_cast<float>(val[i].GetDouble());
+        }
+        return true;
+    }
+};
+
+template <>
+struct ReadHelper<const char *> {
+    static bool Read(Value &val, const char *&out) {
+        return val.IsString() ? (out = val.GetString(), true) : false;
+    }
+};
+
+template <>
+struct ReadHelper<std::string> {
+    static bool Read(Value &val, std::string &out) {
+        return val.IsString() ? (out = std::string(val.GetString(), val.GetStringLength()), true) : false;
+    }
+};
+
+template <class T>
+struct ReadHelper<Nullable<T>> {
+    static bool Read(Value &val, Nullable<T> &out) {
+        return out.isPresent = ReadHelper<T>::Read(val, out.value);
+    }
+};
+
+template <>
+struct ReadHelper<uint64_t> {
+    static bool Read(Value &val, uint64_t &out) {
+        return val.IsUint64() ? out = val.GetUint64(), true : false;
+    }
+};
+
+template <>
+struct ReadHelper<int64_t> {
+    static bool Read(Value &val, int64_t &out) {
+        return val.IsInt64() ? out = val.GetInt64(), true : false;
+    }
+};
+
+template <class T>
+inline static bool ReadValue(Value &val, T &out) {
+    return ReadHelper<T>::Read(val, out);
+}
+
+template <class T>
+inline static bool ReadMember(Value &obj, const char *id, T &out) {
+    if (!obj.IsObject()) {
+        return false;
+    }
+    Value::MemberIterator it = obj.FindMember(id);
+    if (it != obj.MemberEnd()) {
+        return ReadHelper<T>::Read(it->value, out);
+    }
+    return false;
+}
+
+template <class T>
+inline static T MemberOrDefault(Value &obj, const char *id, T defaultValue) {
+    T out;
+    return ReadMember(obj, id, out) ? out : defaultValue;
+}
+
+inline Value *FindMember(Value &val, const char *id) {
+    if (!val.IsObject()) {
+        return nullptr;
+    }
+    Value::MemberIterator it = val.FindMember(id);
+    return (it != val.MemberEnd()) ? &it->value : nullptr;
+}
+
+template <int N>
+inline void throwUnexpectedTypeError(const char (&expectedTypeName)[N], const char *memberId, const char *context, const char *extraContext) {
+    std::string fullContext = context;
+    if (extraContext && (strlen(extraContext) > 0)) {
+        fullContext = fullContext + " (" + extraContext + ")";
+    }
+    throw DeadlyImportError("Member \"", memberId, "\" was not of type \"", expectedTypeName, "\" when reading ", fullContext);
+}
+
+// Look-up functions with type checks. Context and extra context help the user identify the problem if there's an error.
+
+inline Value *FindStringInContext(Value &val, const char *memberId, const char *context, const char *extraContext = nullptr) {
+    if (!val.IsObject()) {
+        return nullptr;
+    }
+    Value::MemberIterator it = val.FindMember(memberId);
+    if (it == val.MemberEnd()) {
+        return nullptr;
+    }
+    if (!it->value.IsString()) {
+        throwUnexpectedTypeError("string", memberId, context, extraContext);
+    }
+    return &it->value;
+}
+
+inline Value *FindNumberInContext(Value &val, const char *memberId, const char *context, const char *extraContext = nullptr) {
+    if (!val.IsObject()) {
+        return nullptr;
+    }
+    Value::MemberIterator it = val.FindMember(memberId);
+    if (it == val.MemberEnd()) {
+        return nullptr;
+    }
+    if (!it->value.IsNumber()) {
+        throwUnexpectedTypeError("number", memberId, context, extraContext);
+    }
+    return &it->value;
+}
+
+inline Value *FindUIntInContext(Value &val, const char *memberId, const char *context, const char *extraContext = nullptr) {
+    if (!val.IsObject()) {
+        return nullptr;
+    }
+    Value::MemberIterator it = val.FindMember(memberId);
+    if (it == val.MemberEnd()) {
+        return nullptr;
+    }
+    if (!it->value.IsUint()) {
+        throwUnexpectedTypeError("uint", memberId, context, extraContext);
+    }
+    return &it->value;
+}
+
+inline Value *FindArrayInContext(Value &val, const char *memberId, const char *context, const char *extraContext = nullptr) {
+    if (!val.IsObject()) {
+        return nullptr;
+    }
+    Value::MemberIterator it = val.FindMember(memberId);
+    if (it == val.MemberEnd()) {
+        return nullptr;
+    }
+    if (!it->value.IsArray()) {
+        throwUnexpectedTypeError("array", memberId, context, extraContext);
+    }
+    return &it->value;
+}
+
+inline Value *FindObjectInContext(Value &val, const char *memberId, const char *context, const char *extraContext = nullptr) {
+    if (!val.IsObject()) {
+        return nullptr;
+    }
+    Value::MemberIterator it = val.FindMember(memberId);
+    if (it == val.MemberEnd()) {
+        return nullptr;
+    }
+    if (!it->value.IsObject()) {
+        throwUnexpectedTypeError("object", memberId, context, extraContext);
+    }
+    return &it->value;
+}
+
+inline Value *FindExtensionInContext(Value &val, const char *extensionId, const char *context, const char *extraContext = nullptr) {
+    if (Value *extensionList = FindObjectInContext(val, "extensions", context, extraContext)) {
+        if (Value *extension = FindObjectInContext(*extensionList, extensionId, context, extraContext)) {
+            return extension;
+        }
+    }
+    return nullptr;
+}
+
+// Overloads when the value is the document.
+
+inline Value *FindString(Document &doc, const char *memberId) {
+    return FindStringInContext(doc, memberId, "the document");
+}
+
+inline Value *FindNumber(Document &doc, const char *memberId) {
+    return FindNumberInContext(doc, memberId, "the document");
+}
+
+inline Value *FindUInt(Document &doc, const char *memberId) {
+    return FindUIntInContext(doc, memberId, "the document");
+}
+
+inline Value *FindArray(Document &val, const char *memberId) {
+    return FindArrayInContext(val, memberId, "the document");
+}
+
+inline Value *FindObject(Document &doc, const char *memberId) {
+    return FindObjectInContext(doc, memberId, "the document");
+}
+
+inline Value *FindExtension(Value &val, const char *extensionId) {
+    return FindExtensionInContext(val, extensionId, "the document");
+}
+
+inline Value *FindString(Value &val, const char *id) {
+    Value::MemberIterator it = val.FindMember(id);
+    return (it != val.MemberEnd() && it->value.IsString()) ? &it->value : 0;
+}
+
+inline Value *FindObject(Value &val, const char *id) {
+    Value::MemberIterator it = val.FindMember(id);
+    return (it != val.MemberEnd() && it->value.IsObject()) ? &it->value : 0;
+}
+
+inline Value *FindArray(Value &val, const char *id) {
+    Value::MemberIterator it = val.FindMember(id);
+    return (it != val.MemberEnd() && it->value.IsArray()) ? &it->value : 0;
+}
+
+inline Value *FindNumber(Value &val, const char *id) {
+    Value::MemberIterator it = val.FindMember(id);
+    return (it != val.MemberEnd() && it->value.IsNumber()) ? &it->value : 0;
+}
+
+} // namespace glTFCommon
+
+#endif // ASSIMP_BUILD_NO_GLTF_IMPORTER
+
+#endif // AI_GLFTCOMMON_H_INC
diff --git a/libs/assimp/code/AssetLib/glTF/glTFExporter.cpp b/libs/assimp/code/AssetLib/glTF/glTFExporter.cpp
new file mode 100644
index 0000000..afcfb12
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFExporter.cpp
@@ -0,0 +1,1065 @@
+/*
+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/glTF/glTFExporter.h"
+#include "AssetLib/glTF/glTFAssetWriter.h"
+#include "PostProcessing/SplitLargeMeshes.h"
+
+#include <assimp/commonMetaData.h>
+#include <assimp/Exceptional.h>
+#include <assimp/StringComparison.h>
+#include <assimp/ByteSwapper.h>
+#include <assimp/SceneCombiner.h>
+#include <assimp/version.h>
+#include <assimp/IOSystem.hpp>
+#include <assimp/Exporter.hpp>
+#include <assimp/material.h>
+#include <assimp/scene.h>
+
+// Header files, standard library.
+#include <memory>
+#include <limits>
+#include <inttypes.h>
+
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+	// Header files, Open3DGC.
+#	include <Open3DGC/o3dgcSC3DMCEncoder.h>
+#endif
+
+using namespace rapidjson;
+
+using namespace Assimp;
+using namespace glTF;
+
+namespace Assimp {
+
+    // ------------------------------------------------------------------------------------------------
+    // Worker function for exporting a scene to GLTF. Prototyped and registered in Exporter.cpp
+    void ExportSceneGLTF(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
+    {
+        // invoke the exporter
+        glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, false);
+    }
+
+    // ------------------------------------------------------------------------------------------------
+    // Worker function for exporting a scene to GLB. Prototyped and registered in Exporter.cpp
+    void ExportSceneGLB(const char* pFile, IOSystem* pIOSystem, const aiScene* pScene, const ExportProperties* pProperties)
+    {
+        // invoke the exporter
+        glTFExporter exporter(pFile, pIOSystem, pScene, pProperties, true);
+    }
+
+} // end of namespace Assimp
+
+glTFExporter::glTFExporter(const char* filename, IOSystem* pIOSystem, const aiScene* pScene,
+                           const ExportProperties* pProperties, bool isBinary)
+    : mFilename(filename)
+    , mIOSystem(pIOSystem)
+    , mProperties(pProperties)
+{
+    aiScene* sceneCopy_tmp;
+    SceneCombiner::CopyScene(&sceneCopy_tmp, pScene);
+
+    SplitLargeMeshesProcess_Triangle tri_splitter;
+    tri_splitter.SetLimit(0xffff);
+    tri_splitter.Execute(sceneCopy_tmp);
+
+    SplitLargeMeshesProcess_Vertex vert_splitter;
+    vert_splitter.SetLimit(0xffff);
+    vert_splitter.Execute(sceneCopy_tmp);
+
+    mScene.reset(sceneCopy_tmp);
+
+    mAsset.reset( new glTF::Asset( pIOSystem ) );
+
+    if (isBinary) {
+        mAsset->SetAsBinary();
+    }
+
+    ExportMetadata();
+
+    //for (unsigned int i = 0; i < pScene->mNumCameras; ++i) {}
+
+    //for (unsigned int i = 0; i < pScene->mNumLights; ++i) {}
+
+    ExportMaterials();
+
+    if (mScene->mRootNode) {
+        ExportNodeHierarchy(mScene->mRootNode);
+    }
+
+    ExportMeshes();
+
+    //for (unsigned int i = 0; i < pScene->mNumTextures; ++i) {}
+
+    ExportScene();
+
+    ExportAnimations();
+
+    glTF::AssetWriter writer(*mAsset);
+
+    if (isBinary) {
+        writer.WriteGLBFile(filename);
+    } else {
+        writer.WriteFile(filename);
+    }
+}
+
+/*
+ * 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, glTF::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(glTF::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;
+}
+
+template<typename T>
+void SetAccessorRange(Ref<Accessor> acc, void* data, unsigned int 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];
+
+			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,
+		unsigned int 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;
+	}
+}
+
+inline Ref<Accessor> ExportData(Asset &a, std::string &meshName, Ref<Buffer> &buffer,
+        unsigned int 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 = unsigned(offset);
+    bv->byteLength = length; //! The target that the WebGL buffer should be bound to.
+    bv->target = target;
+
+    // accessor
+    Ref<Accessor> acc = a.accessors.Create(a.FindUniqueID(meshName, "accessor"));
+    acc->bufferView = bv;
+    acc->byteOffset = 0;
+    acc->byteStride = 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;
+}
+
+namespace {
+    void GetMatScalar(const aiMaterial* mat, float& val, const char* propName, int type, int idx) {
+        ai_assert( nullptr != mat );
+        if ( nullptr != mat ) {
+            mat->Get(propName, type, idx, val);
+        }
+    }
+}
+
+void glTFExporter::GetTexSampler(const aiMaterial* mat, glTF::TexProperty& prop)
+{
+    std::string samplerId = mAsset->FindUniqueID("", "sampler");
+    prop.texture->sampler = mAsset->samplers.Create(samplerId);
+
+    aiTextureMapMode mapU, mapV;
+    aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0),(int*)&mapU);
+    aiGetMaterialInteger(mat,AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0),(int*)&mapV);
+
+    switch (mapU) {
+        case aiTextureMapMode_Wrap:
+            prop.texture->sampler->wrapS = SamplerWrap_Repeat;
+            break;
+        case aiTextureMapMode_Clamp:
+            prop.texture->sampler->wrapS = SamplerWrap_Clamp_To_Edge;
+            break;
+        case aiTextureMapMode_Mirror:
+            prop.texture->sampler->wrapS = SamplerWrap_Mirrored_Repeat;
+            break;
+        case aiTextureMapMode_Decal:
+        default:
+            prop.texture->sampler->wrapS = SamplerWrap_Repeat;
+            break;
+    };
+
+    switch (mapV) {
+        case aiTextureMapMode_Wrap:
+            prop.texture->sampler->wrapT = SamplerWrap_Repeat;
+            break;
+        case aiTextureMapMode_Clamp:
+            prop.texture->sampler->wrapT = SamplerWrap_Clamp_To_Edge;
+            break;
+        case aiTextureMapMode_Mirror:
+            prop.texture->sampler->wrapT = SamplerWrap_Mirrored_Repeat;
+            break;
+        case aiTextureMapMode_Decal:
+        default:
+            prop.texture->sampler->wrapT = SamplerWrap_Repeat;
+            break;
+    };
+
+    // Hard coded Texture filtering options because I do not know where to find them in the aiMaterial.
+    prop.texture->sampler->magFilter = SamplerMagFilter_Linear;
+    prop.texture->sampler->minFilter = SamplerMinFilter_Linear;
+}
+
+void glTFExporter::GetMatColorOrTex(const aiMaterial* mat, glTF::TexProperty& prop, 
+        const char* propName, int type, int idx, aiTextureType tt) {
+    aiString tex;
+    aiColor4D col;
+    if (mat->GetTextureCount(tt) > 0) {
+        if (mat->Get(AI_MATKEY_TEXTURE(tt, 0), tex) == AI_SUCCESS) {
+            std::string path = tex.C_Str();
+
+            if (path.size() > 0) {
+                if (path[0] != '*') {
+                    std::map<std::string, unsigned int>::iterator it = mTexturesByPath.find(path);
+                    if (it != mTexturesByPath.end()) {
+                        prop.texture = mAsset->textures.Get(it->second);
+                    }
+                }
+
+                if (!prop.texture) {
+                    std::string texId = mAsset->FindUniqueID("", "texture");
+                    prop.texture = mAsset->textures.Create(texId);
+                    mTexturesByPath[path] = prop.texture.GetIndex();
+
+                    std::string imgId = mAsset->FindUniqueID("", "image");
+                    prop.texture->source = mAsset->images.Create(imgId);
+
+                    if (path[0] == '*') { // embedded
+                        aiTexture* curTex = mScene->mTextures[atoi(&path[1])];
+
+                        prop.texture->source->name = curTex->mFilename.C_Str();
+
+                        uint8_t *data = reinterpret_cast<uint8_t *>(curTex->pcData);
+                        prop.texture->source->SetData(data, curTex->mWidth, *mAsset);
+
+                        if (curTex->achFormatHint[0]) {
+                            std::string mimeType = "image/";
+                            mimeType += (memcmp(curTex->achFormatHint, "jpg", 3) == 0) ? "jpeg" : curTex->achFormatHint;
+                            prop.texture->source->mimeType = mimeType;
+                        }
+                    } else {
+                        prop.texture->source->uri = path;
+                    }
+
+                    GetTexSampler(mat, prop);
+                }
+            }
+        }
+    }
+
+    if (mat->Get(propName, type, idx, col) == AI_SUCCESS) {
+        prop.color[0] = col.r; 
+        prop.color[1] = col.g;
+        prop.color[2] = col.b; 
+        prop.color[3] = col.a;
+    }
+}
+
+
+void glTFExporter::ExportMaterials()
+{
+    aiString aiName;
+    for (unsigned int i = 0; i < mScene->mNumMaterials; ++i) {
+        const aiMaterial* mat = mScene->mMaterials[i];
+
+
+        std::string name;
+        if (mat->Get(AI_MATKEY_NAME, aiName) == AI_SUCCESS) {
+            name = aiName.C_Str();
+        }
+        name = mAsset->FindUniqueID(name, "material");
+
+        Ref<Material> m = mAsset->materials.Create(name);
+
+        GetMatColorOrTex(mat, m->ambient, AI_MATKEY_COLOR_AMBIENT, aiTextureType_AMBIENT);
+        GetMatColorOrTex(mat, m->diffuse, AI_MATKEY_COLOR_DIFFUSE, aiTextureType_DIFFUSE);
+        GetMatColorOrTex(mat, m->specular, AI_MATKEY_COLOR_SPECULAR, aiTextureType_SPECULAR);
+        GetMatColorOrTex(mat, m->emission, AI_MATKEY_COLOR_EMISSIVE, aiTextureType_EMISSIVE);
+
+        m->transparent = mat->Get(AI_MATKEY_OPACITY, m->transparency) == aiReturn_SUCCESS && m->transparency != 1.0;
+
+        GetMatScalar(mat, m->shininess, AI_MATKEY_SHININESS);
+    }
+}
+
+/*
+ * 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->id;
+
+        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. Ignore all others.
+            if (jointsPerVertex[vertexId] > 3) {
+                continue;
+            }
+
+            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 ) {
+        p.attributes.joint.push_back( vertexJointAccessor );
+    }
+
+    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;
+}
+
+#if defined(__has_warning)
+#if __has_warning("-Wunused-but-set-variable")
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
+#endif
+#endif
+
+void glTFExporter::ExportMeshes()
+{
+    // Not for
+    //     using IndicesType = decltype(aiFace::mNumIndices);
+    // But yes for
+    //     using IndicesType = unsigned short;
+    // because "ComponentType_UNSIGNED_SHORT" used for indices. And it's a maximal type according to glTF specification.
+    typedef unsigned short IndicesType;
+
+    // Variables needed for compression. BEGIN.
+    // Indices, not pointers - because pointer to buffer is changing while writing to it.
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+    size_t idx_srcdata_begin = 0; // Index of buffer before writing mesh data. Also, index of begin of coordinates array in buffer.
+    size_t idx_srcdata_normal = SIZE_MAX;// Index of begin of normals array in buffer. SIZE_MAX - mean that mesh has no normals.
+    size_t idx_srcdata_ind;// Index of begin of coordinates indices array in buffer.
+#endif
+    std::vector<size_t> idx_srcdata_tc;// Array of indices. Every index point to begin of texture coordinates array in buffer.
+    bool comp_allow;// Point that data of current mesh can be compressed.
+    // Variables needed for compression. END.
+
+    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];
+
+		// Check if compressing requested and mesh can be encoded.
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+		comp_allow = mProperties->GetPropertyBool("extensions.Open3DGC.use", false);
+#else
+		comp_allow = false;
+#endif
+
+		if(comp_allow && (aim->mPrimitiveTypes == aiPrimitiveType_TRIANGLE) && (aim->mNumVertices > 0) && (aim->mNumFaces > 0))
+		{
+			idx_srcdata_tc.clear();
+			idx_srcdata_tc.reserve(AI_MAX_NUMBER_OF_TEXTURECOORDS);
+		}
+		else
+		{
+			std::string msg;
+
+			if(aim->mPrimitiveTypes != aiPrimitiveType_TRIANGLE)
+				msg = "all primitives of the mesh must be a triangles.";
+			else
+				msg = "mesh must has vertices and faces.";
+
+            ASSIMP_LOG_WARN("GLTF: can not use Open3DGC-compression: ", msg);
+            comp_allow = false;
+		}
+
+        std::string meshId = mAsset->FindUniqueID(aim->mName.C_Str(), "mesh");
+        Ref<Mesh> m = mAsset->meshes.Create(meshId);
+        m->primitives.resize(1);
+        Mesh::Primitive& p = m->primitives.back();
+
+        p.material = mAsset->materials.Get(aim->mMaterialIndex);
+
+		/******************* Vertices ********************/
+		// If compression is used then you need parameters of uncompressed region: begin and size. At this step "begin" is stored.
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+		if(comp_allow) idx_srcdata_begin = b->byteLength;
+#endif
+
+        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 ********************/
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+		if(comp_allow && (aim->mNormals != 0)) idx_srcdata_normal = b->byteLength;// Store index of normals array.
+#endif
+
+		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) {
+            // 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;
+
+				if(comp_allow) idx_srcdata_tc.push_back(b->byteLength);// Store index of texture coordinates array.
+
+				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);
+			}
+		}
+
+		/*************** Vertices indices ****************/
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+		idx_srcdata_ind = b->byteLength;// Store index of indices array.
+#endif
+
+		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] = uint16_t(aim->mFaces[i].mIndices[j]);
+                }
+            }
+
+			p.indices = ExportData(*mAsset, meshId, b, unsigned(indices.size()), &indices[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_UNSIGNED_SHORT, 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;
+        }
+
+    /*************** Skins ****************/
+    if(aim->HasBones()) {
+        ExportSkin(*mAsset, aim, m, b, skinRef, inverseBindMatricesData);
+    }
+
+		/****************** Compression ******************/
+		///TODO: animation: weights, joints.
+		if(comp_allow)
+		{
+#ifdef ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC
+			// Only one type of compression supported at now - Open3DGC.
+		//
+			o3dgc::BinaryStream bs;
+			o3dgc::SC3DMCEncoder<IndicesType> encoder;
+			o3dgc::IndexedFaceSet<IndicesType> comp_o3dgc_ifs;
+			o3dgc::SC3DMCEncodeParams comp_o3dgc_params;
+
+			//
+			// Fill data for encoder.
+			//
+			// Quantization
+			unsigned quant_coord = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.POSITION", 12);
+			unsigned quant_normal = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.NORMAL", 10);
+			unsigned quant_texcoord = mProperties->GetPropertyInteger("extensions.Open3DGC.quantization.TEXCOORD", 10);
+
+			// Prediction
+			o3dgc::O3DGCSC3DMCPredictionMode prediction_position = o3dgc::O3DGC_SC3DMC_PARALLELOGRAM_PREDICTION;
+			o3dgc::O3DGCSC3DMCPredictionMode prediction_normal =  o3dgc::O3DGC_SC3DMC_SURF_NORMALS_PREDICTION;
+			o3dgc::O3DGCSC3DMCPredictionMode prediction_texcoord = o3dgc::O3DGC_SC3DMC_PARALLELOGRAM_PREDICTION;
+
+			// IndexedFacesSet: "Crease angle", "solid", "convex" are set to default.
+			comp_o3dgc_ifs.SetCCW(true);
+			comp_o3dgc_ifs.SetIsTriangularMesh(true);
+			comp_o3dgc_ifs.SetNumFloatAttributes(0);
+			// Coordinates
+			comp_o3dgc_params.SetCoordQuantBits(quant_coord);
+			comp_o3dgc_params.SetCoordPredMode(prediction_position);
+			comp_o3dgc_ifs.SetNCoord(aim->mNumVertices);
+			comp_o3dgc_ifs.SetCoord((o3dgc::Real* const)&b->GetPointer()[idx_srcdata_begin]);
+			// Normals
+			if(idx_srcdata_normal != SIZE_MAX)
+			{
+				comp_o3dgc_params.SetNormalQuantBits(quant_normal);
+				comp_o3dgc_params.SetNormalPredMode(prediction_normal);
+				comp_o3dgc_ifs.SetNNormal(aim->mNumVertices);
+				comp_o3dgc_ifs.SetNormal((o3dgc::Real* const)&b->GetPointer()[idx_srcdata_normal]);
+			}
+
+			// Texture coordinates
+			for(size_t num_tc = 0; num_tc < idx_srcdata_tc.size(); num_tc++)
+			{
+				size_t num = comp_o3dgc_ifs.GetNumFloatAttributes();
+
+				comp_o3dgc_params.SetFloatAttributeQuantBits(static_cast<unsigned long>(num), quant_texcoord);
+				comp_o3dgc_params.SetFloatAttributePredMode(static_cast<unsigned long>(num), prediction_texcoord);
+				comp_o3dgc_ifs.SetNFloatAttribute(static_cast<unsigned long>(num), aim->mNumVertices);// number of elements.
+				comp_o3dgc_ifs.SetFloatAttributeDim(static_cast<unsigned long>(num), aim->mNumUVComponents[num_tc]);// components per element: aiVector3D => x * float
+				comp_o3dgc_ifs.SetFloatAttributeType(static_cast<unsigned long>(num), o3dgc::O3DGC_IFS_FLOAT_ATTRIBUTE_TYPE_TEXCOORD);
+				comp_o3dgc_ifs.SetFloatAttribute(static_cast<unsigned long>(num), (o3dgc::Real* const)&b->GetPointer()[idx_srcdata_tc[num_tc]]);
+				comp_o3dgc_ifs.SetNumFloatAttributes(static_cast<unsigned long>(num + 1));
+			}
+
+			// Coordinates indices
+			comp_o3dgc_ifs.SetNCoordIndex(aim->mNumFaces);
+			comp_o3dgc_ifs.SetCoordIndex((IndicesType* const)&b->GetPointer()[idx_srcdata_ind]);
+			// Prepare to encoding
+			comp_o3dgc_params.SetNumFloatAttributes(comp_o3dgc_ifs.GetNumFloatAttributes());
+			if(mProperties->GetPropertyBool("extensions.Open3DGC.binary", true))
+				comp_o3dgc_params.SetStreamType(o3dgc::O3DGC_STREAM_TYPE_BINARY);
+			else
+				comp_o3dgc_params.SetStreamType(o3dgc::O3DGC_STREAM_TYPE_ASCII);
+
+			comp_o3dgc_ifs.ComputeMinMax(o3dgc::O3DGC_SC3DMC_MAX_ALL_DIMS);
+			//
+			// Encoding
+			//
+			encoder.Encode(comp_o3dgc_params, comp_o3dgc_ifs, bs);
+			// Replace data in buffer.
+			b->ReplaceData(idx_srcdata_begin, b->byteLength - idx_srcdata_begin, bs.GetBuffer(), bs.GetSize());
+			//
+			// Add information about extension to mesh.
+			//
+			// Create extension structure.
+			Mesh::SCompression_Open3DGC* ext = new Mesh::SCompression_Open3DGC;
+
+			// Fill it.
+			ext->Buffer = b->id;
+			ext->Offset = idx_srcdata_begin;
+			ext->Count = b->byteLength - idx_srcdata_begin;
+			ext->Binary = mProperties->GetPropertyBool("extensions.Open3DGC.binary");
+			ext->IndicesCount = comp_o3dgc_ifs.GetNCoordIndex() * 3;
+			ext->VerticesCount = comp_o3dgc_ifs.GetNCoord();
+			// And assign to mesh.
+			m->Extension.push_back(ext);
+#endif
+		}// if(comp_allow)
+	}// for (unsigned int i = 0; i < mScene->mNumMeshes; ++i)
+
+    //----------------------------------------
+    // Finish the skin
+    // Create the Accessor for skinRef->inverseBindMatrices
+    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 = true;
+        IdentityMatrix4(skinRef->bindShapeMatrix.value);
+
+        // Find node that contains this mesh and add "skeletons" and "skin" attributes to that node.
+        Ref<Node> rootNode = mAsset->nodes.Get(unsigned(0));
+        Ref<Node> meshNode;
+        std::string meshID = mAsset->meshes.Get(unsigned(0))->id;
+        FindMeshNode(rootNode, meshNode, meshID);
+
+        Ref<Node> rootJoint = FindSkeletonRootJoint(skinRef);
+        meshNode->skeletons.push_back(rootJoint);
+        meshNode->skin = skinRef;
+    }
+}
+
+#if defined(__has_warning)
+#if __has_warning("-Wunused-but-set-variable")
+#pragma GCC diagnostic pop
+#endif
+#endif
+
+/*
+ * Export the root node of the node hierarchy.
+ * Calls ExportNode for all children.
+ */
+unsigned int glTFExporter::ExportNodeHierarchy(const aiNode* n)
+{
+    Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node"));
+
+    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.push_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.push_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 glTFExporter::ExportNode(const aiNode* n, Ref<Node>& parent)
+{
+    Ref<Node> node = mAsset->nodes.Create(mAsset->FindUniqueID(n->mName.C_Str(), "node"));
+
+    node->parent = parent;
+
+    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.push_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.push_back(mAsset->nodes.Get(idx));
+    }
+
+    return node.GetIndex();
+}
+
+
+void glTFExporter::ExportScene()
+{
+    const char* sceneName = "defaultScene";
+    Ref<Scene> scene = mAsset->scenes.Create(sceneName);
+
+    // root node will be the first one exported (idx 0)
+    if (mAsset->nodes.Size() > 0) {
+        scene->nodes.push_back(mAsset->nodes.Get(0u));
+    }
+
+    // set as the default scene
+    mAsset->scene = scene;
+}
+
+void glTFExporter::ExportMetadata()
+{
+    glTF::AssetMetadata& asset = mAsset->asset;
+    asset.version = "1.0";
+
+    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 void ExtractAnimationData(Asset& mAsset, std::string& animId, Ref<Animation>& animRef, Ref<Buffer>& buffer, const aiNodeAnim* nodeChannel, float ticksPerSecond)
+{
+    // Loop over the data and check to see if it exactly matches an existing buffer.
+    //    If yes, then reference the existing corresponding accessor.
+    //    Otherwise, add to the buffer and create a new accessor.
+
+    size_t counts[3] = {
+        nodeChannel->mNumPositionKeys,
+        nodeChannel->mNumScalingKeys,
+        nodeChannel->mNumRotationKeys,
+    };
+    size_t numKeyframes = 1;
+    for (int i = 0; i < 3; ++i) {
+        if (counts[i] > numKeyframes) {
+            numKeyframes = counts[i];
+        }
+    }
+
+    //-------------------------------------------------------
+    // Extract TIME parameter data.
+    // Check if the timeStamps are the same for mPositionKeys, mRotationKeys, and mScalingKeys.
+    if(nodeChannel->mNumPositionKeys > 0) {
+        typedef float TimeType;
+        std::vector<TimeType> timeData;
+        timeData.resize(numKeyframes);
+        for (size_t i = 0; i < numKeyframes; ++i) {
+            size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes;
+            // mTime is measured in ticks, but GLTF time is measured in seconds, so convert.
+            // Check if we have to cast type here. e.g. uint16_t()
+            timeData[i] = static_cast<float>(nodeChannel->mPositionKeys[frameIndex].mTime / ticksPerSecond);
+        }
+
+        Ref<Accessor> timeAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), &timeData[0], AttribType::SCALAR, AttribType::SCALAR, ComponentType_FLOAT);
+        if (timeAccessor) animRef->Parameters.TIME = timeAccessor;
+    }
+
+    //-------------------------------------------------------
+    // Extract translation parameter data
+    if(nodeChannel->mNumPositionKeys > 0) {
+        C_STRUCT aiVector3D* translationData = new aiVector3D[numKeyframes];
+        for (size_t i = 0; i < numKeyframes; ++i) {
+            size_t frameIndex = i * nodeChannel->mNumPositionKeys / numKeyframes;
+            translationData[i] = nodeChannel->mPositionKeys[frameIndex].mValue;
+        }
+
+        Ref<Accessor> tranAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), translationData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
+        if ( tranAccessor ) {
+            animRef->Parameters.translation = tranAccessor;
+        }
+        delete[] translationData;
+    }
+
+    //-------------------------------------------------------
+    // Extract scale parameter data
+    if(nodeChannel->mNumScalingKeys > 0) {
+        C_STRUCT aiVector3D* scaleData = new aiVector3D[numKeyframes];
+        for (size_t i = 0; i < numKeyframes; ++i) {
+            size_t frameIndex = i * nodeChannel->mNumScalingKeys / numKeyframes;
+            scaleData[i] = nodeChannel->mScalingKeys[frameIndex].mValue;
+        }
+
+        Ref<Accessor> scaleAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), scaleData, AttribType::VEC3, AttribType::VEC3, ComponentType_FLOAT);
+        if ( scaleAccessor ) {
+            animRef->Parameters.scale = scaleAccessor;
+        }
+        delete[] scaleData;
+    }
+
+    //-------------------------------------------------------
+    // Extract rotation parameter data
+    if(nodeChannel->mNumRotationKeys > 0) {
+        vec4* rotationData = new vec4[numKeyframes];
+        for (size_t i = 0; i < numKeyframes; ++i) {
+            size_t frameIndex = i * nodeChannel->mNumRotationKeys / numKeyframes;
+            rotationData[i][0] = nodeChannel->mRotationKeys[frameIndex].mValue.x;
+            rotationData[i][1] = nodeChannel->mRotationKeys[frameIndex].mValue.y;
+            rotationData[i][2] = nodeChannel->mRotationKeys[frameIndex].mValue.z;
+            rotationData[i][3] = nodeChannel->mRotationKeys[frameIndex].mValue.w;
+        }
+
+        Ref<Accessor> rotAccessor = ExportData(mAsset, animId, buffer, static_cast<unsigned int>(numKeyframes), rotationData, AttribType::VEC4, AttribType::VEC4, ComponentType_FLOAT);
+        if ( rotAccessor ) {
+            animRef->Parameters.rotation = rotAccessor;
+        }
+        delete[] rotationData;
+    }
+}
+
+void glTFExporter::ExportAnimations()
+{
+    Ref<Buffer> bufferRef = mAsset->buffers.Get(unsigned (0));
+
+    for (unsigned int i = 0; i < mScene->mNumAnimations; ++i) {
+        const aiAnimation* anim = mScene->mAnimations[i];
+
+        std::string nameAnim = "anim";
+        if (anim->mName.length > 0) {
+            nameAnim = anim->mName.C_Str();
+        }
+
+        for (unsigned int channelIndex = 0; channelIndex < anim->mNumChannels; ++channelIndex) {
+            const aiNodeAnim* nodeChannel = anim->mChannels[channelIndex];
+
+            // It appears that assimp stores this type of animation as multiple animations.
+            // where each aiNodeAnim in mChannels animates a specific node.
+            std::string name = nameAnim + "_" + ai_to_string(channelIndex);
+            name = mAsset->FindUniqueID(name, "animation");
+            Ref<Animation> animRef = mAsset->animations.Create(name);
+
+            /******************* Parameters ********************/
+            ExtractAnimationData(*mAsset, name, animRef, bufferRef, nodeChannel, static_cast<float>(anim->mTicksPerSecond));
+
+            for (unsigned int j = 0; j < 3; ++j) {
+                std::string channelType;
+                int channelSize=0;
+                switch (j) {
+                    case 0:
+                        channelType = "rotation";
+                        channelSize = nodeChannel->mNumRotationKeys;
+                        break;
+                    case 1:
+                        channelType = "scale";
+                        channelSize = nodeChannel->mNumScalingKeys;
+                        break;
+                    case 2:
+                        channelType = "translation";
+                        channelSize = nodeChannel->mNumPositionKeys;
+                        break;
+                }
+
+                if (channelSize < 1) { continue; }
+
+                Animation::AnimChannel tmpAnimChannel;
+                Animation::AnimSampler tmpAnimSampler;
+
+                tmpAnimChannel.sampler = name + "_" + channelType;
+                tmpAnimChannel.target.path = channelType;
+                tmpAnimSampler.output = channelType;
+                tmpAnimSampler.id = name + "_" + channelType;
+
+                tmpAnimChannel.target.id = mAsset->nodes.Get(nodeChannel->mNodeName.C_Str());
+
+                tmpAnimSampler.input = "TIME";
+                tmpAnimSampler.interpolation = "LINEAR";
+
+                animRef->Channels.push_back(tmpAnimChannel);
+                animRef->Samplers.push_back(tmpAnimSampler);
+            }
+
+        }
+
+        // Assimp documentation staes this is not used (not implemented)
+        // for (unsigned int channelIndex = 0; channelIndex < anim->mNumMeshChannels; ++channelIndex) {
+        //     const aiMeshAnim* meshChannel = anim->mMeshChannels[channelIndex];
+        // }
+
+    } // End: for-loop mNumAnimations
+}
+
+
+#endif // ASSIMP_BUILD_NO_GLTF_EXPORTER
+#endif // ASSIMP_BUILD_NO_EXPORT
diff --git a/libs/assimp/code/AssetLib/glTF/glTFExporter.h b/libs/assimp/code/AssetLib/glTF/glTFExporter.h
new file mode 100644
index 0000000..a526954
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFExporter.h
@@ -0,0 +1,118 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+/** @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/types.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;
+
+    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
diff --git a/libs/assimp/code/AssetLib/glTF/glTFImporter.cpp b/libs/assimp/code/AssetLib/glTF/glTFImporter.cpp
new file mode 100644
index 0000000..81db12e
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFImporter.cpp
@@ -0,0 +1,725 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+
+#if !defined(ASSIMP_BUILD_NO_GLTF_IMPORTER) && !defined(ASSIMP_BUILD_NO_GLTF1_IMPORTER)
+
+#include "AssetLib/glTF/glTFImporter.h"
+#include "AssetLib/glTF/glTFAsset.h"
+#if !defined(ASSIMP_BUILD_NO_EXPORT)
+#include "AssetLib/glTF/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>
+#include <assimp/Importer.hpp>
+
+#include <memory>
+
+using namespace Assimp;
+using namespace glTF;
+
+//
+// glTFImporter
+//
+
+static const aiImporterDesc desc = {
+    "glTF Importer",
+    "",
+    "",
+    "",
+    aiImporterFlags_SupportTextFlavour | aiImporterFlags_SupportBinaryFlavour | aiImporterFlags_SupportCompressedFlavour | aiImporterFlags_LimitedSupport | aiImporterFlags_Experimental,
+    0,
+    0,
+    0,
+    0,
+    "gltf glb"
+};
+
+glTFImporter::glTFImporter() :
+        BaseImporter(), meshOffsets(), embeddedTexIdxs(), mScene(nullptr) {
+    // empty
+}
+
+glTFImporter::~glTFImporter() {
+    // empty
+}
+
+const aiImporterDesc *glTFImporter::GetInfo() const {
+    return &desc;
+}
+
+bool glTFImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /* checkSig */) const {
+    glTF::Asset asset(pIOHandler);
+    try {
+        asset.Load(pFile, GetExtension(pFile) == "glb");
+        std::string version = asset.asset.version;
+        return !version.empty() && version[0] == '1';
+    } catch (...) {
+        return false;
+    }
+}
+
+inline void SetMaterialColorProperty(std::vector<int> &embeddedTexIdxs, Asset & /*r*/, glTF::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);
+
+            int texIdx = embeddedTexIdxs[prop.texture->source.GetIndex()];
+            if (texIdx != -1) { // embedded
+                // setup texture reference string (copied from ColladaLoader::FindFilenameForEffectTexture)
+                uri.data[0] = '*';
+                uri.length = 1 + ASSIMP_itoa10(uri.data + 1, MAXLEN - 1, texIdx);
+            }
+
+            mat->AddProperty(&uri, _AI_MATKEY_TEXTURE_BASE, texType, 0);
+        }
+    } else {
+        aiColor4D col;
+        CopyValue(prop.color, col);
+        mat->AddProperty(&col, 1, pKey, type, idx);
+    }
+}
+
+void glTFImporter::ImportMaterials(glTF::Asset &r) {
+    mScene->mNumMaterials = unsigned(r.materials.Size());
+    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];
+
+        /*if (!mat.name.empty())*/ {
+            aiString str(mat.id /*mat.name*/);
+            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);
+        }
+    }
+
+    if (mScene->mNumMaterials == 0) {
+        mScene->mNumMaterials = 1;
+        // Delete the array of length zero created above.
+        delete[] mScene->mMaterials;
+        mScene->mMaterials = new aiMaterial *[1];
+        mScene->mMaterials[0] = new aiMaterial();
+    }
+}
+
+static inline void SetFace(aiFace &face, int a) {
+    face.mNumIndices = 1;
+    face.mIndices = new unsigned int[1];
+    face.mIndices[0] = a;
+}
+
+static inline 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;
+}
+
+static inline 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;
+}
+
+static inline bool CheckValidFacesIndices(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 glTFImporter::ImportMeshes(glTF::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 += unsigned(mesh.primitives.size());
+
+        for (unsigned int p = 0; p < mesh.primitives.size(); ++p) {
+            Mesh::Primitive &prim = 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(MAXLEN - len - 1), p);
+            }
+
+            switch (prim.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 = prim.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 = 0;
+            unsigned int nFaces = 0;
+
+            if (prim.indices) {
+                unsigned int count = prim.indices->count;
+
+                Accessor::Indexer data = prim.indices->GetIndexer();
+                ai_assert(data.IsValid());
+
+                switch (prim.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 - ((prim.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 (prim.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 (prim.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 - ((prim.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 (prim.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 (prim.material) {
+                aim->mMaterialIndex = prim.material.GetIndex();
+            }
+        }
+    }
+
+    meshOffsets.push_back(k);
+
+    CopyVector(meshes, mScene->mMeshes, mScene->mNumMeshes);
+}
+
+void glTFImporter::ImportCameras(glTF::Asset &r) {
+    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) {
+        Camera &cam = r.cameras[i];
+
+        aiCamera *aicam = mScene->mCameras[i] = new aiCamera();
+
+        if (cam.type == Camera::Perspective) {
+            aicam->mAspect = cam.perspective.aspectRatio;
+            aicam->mHorizontalFOV = cam.perspective.yfov * ((aicam->mAspect == 0.f) ? 1.f : aicam->mAspect);
+            aicam->mClipPlaneFar = cam.perspective.zfar;
+            aicam->mClipPlaneNear = cam.perspective.znear;
+        } else {
+            aicam->mClipPlaneFar = cam.ortographic.zfar;
+            aicam->mClipPlaneNear = cam.ortographic.znear;
+            aicam->mHorizontalFOV = 0.0;
+            aicam->mAspect = 1.0f;
+            if (0.f != cam.ortographic.ymag) {
+                aicam->mAspect = cam.ortographic.xmag / cam.ortographic.ymag;
+            }
+        }
+    }
+}
+
+void glTFImporter::ImportLights(glTF::Asset &r) {
+    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.falloffExponent; // TODO fix this, it does not look right at all
+
+        ail->mAttenuationConstant = l.constantAttenuation;
+        ail->mAttenuationLinear = l.linearAttenuation;
+        ail->mAttenuationQuadratic = l.quadraticAttenuation;
+    }
+}
+
+aiNode *ImportNode(aiScene *pScene, glTF::Asset &r, std::vector<unsigned int> &meshOffsets, glTF::Ref<glTF::Node> &ptr) {
+    Node &node = *ptr;
+
+    aiNode *ainode = new aiNode(node.id);
+
+    if (!node.children.empty()) {
+        ainode->mNumChildren = 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) {
+            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) {
+            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(glTF::Asset &r) {
+    if (!r.scene) return;
+
+    std::vector<Ref<Node>> rootNodes = r.scene->nodes;
+
+    // The root nodes
+    unsigned int numRootNodes = unsigned(rootNodes.size());
+    if (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;
+    }
+
+    //if (!mScene->mRootNode) {
+    //  mScene->mRootNode = new aiNode("EMPTY");
+    //}
+}
+
+void glTFImporter::ImportEmbeddedTextures(glTF::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();
+
+        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 = reinterpret_cast<aiTexel *>(data);
+
+        if (!img.mimeType.empty()) {
+            const char *ext = strchr(img.mimeType.c_str(), '/') + 1;
+            if (ext) {
+                if (strcmp(ext, "jpeg") == 0) ext = "jpg";
+
+                size_t len = strlen(ext);
+                if (len <= 3) {
+                    strcpy(tex->achFormatHint, ext);
+                }
+            }
+        }
+    }
+}
+
+void glTFImporter::ImportCommonMetadata(glTF::Asset &a) {
+    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
+    glTF::Asset asset(pIOHandler);
+    asset.Load(pFile, GetExtension(pFile) == "glb");
+
+    //
+    // 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
diff --git a/libs/assimp/code/AssetLib/glTF/glTFImporter.h b/libs/assimp/code/AssetLib/glTF/glTFImporter.h
new file mode 100644
index 0000000..529da53
--- /dev/null
+++ b/libs/assimp/code/AssetLib/glTF/glTFImporter.h
@@ -0,0 +1,89 @@
+/*
+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.
+
+----------------------------------------------------------------------
+*/
+#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;
+    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);
+    void ImportMeshes(glTF::Asset &a);
+    void ImportCameras(glTF::Asset &a);
+    void ImportLights(glTF::Asset &a);
+    void ImportNodes(glTF::Asset &a);
+    void ImportCommonMetadata(glTF::Asset &a);
+
+private:
+    std::vector<unsigned int> meshOffsets;
+    std::vector<int> embeddedTexIdxs;
+    aiScene *mScene;
+};
+
+} // namespace Assimp
+
+#endif // AI_GLTFIMPORTER_H_INC