add assimp submodule

2 files changed, 876 insertions, 0 deletions

diff --git a/src/mesh/assimp-master/code/AssetLib/B3D/B3DImporter.cpp b/src/mesh/assimp-master/code/AssetLib/B3D/B3DImporter.cpp
new file mode 100644
index 0000000..c4ef75b
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/B3D/B3DImporter.cpp
@@ -0,0 +1,744 @@
+/*
+---------------------------------------------------------------------------
+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  B3DImporter.cpp
+ *  @brief Implementation of the b3d importer class
+ */
+
+#ifndef ASSIMP_BUILD_NO_B3D_IMPORTER
+
+// internal headers
+#include "AssetLib/B3D/B3DImporter.h"
+#include "PostProcessing/ConvertToLHProcess.h"
+#include "PostProcessing/TextureTransform.h"
+
+#include <assimp/StringUtils.h>
+#include <assimp/anim.h>
+#include <assimp/importerdesc.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/IOSystem.hpp>
+
+#include <memory>
+
+using namespace Assimp;
+using namespace std;
+
+static const aiImporterDesc desc = {
+    "BlitzBasic 3D Importer",
+    "",
+    "",
+    "http://www.blitzbasic.com/",
+    aiImporterFlags_SupportBinaryFlavour,
+    0,
+    0,
+    0,
+    0,
+    "b3d"
+};
+
+#ifdef _MSC_VER
+#pragma warning(disable : 4018)
+#endif
+
+//#define DEBUG_B3D
+
+template<typename T>
+void DeleteAllBarePointers(std::vector<T> &x) {
+    for (auto p : x) {
+        delete p;
+    }
+}
+
+B3DImporter::~B3DImporter() {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+bool B3DImporter::CanRead(const std::string &pFile, IOSystem * /*pIOHandler*/, bool /*checkSig*/) const {
+    size_t pos = pFile.find_last_of('.');
+    if (pos == string::npos) {
+        return false;
+    }
+
+    string ext = pFile.substr(pos + 1);
+    if (ext.size() != 3) {
+        return false;
+    }
+
+    return (ext[0] == 'b' || ext[0] == 'B') && (ext[1] == '3') && (ext[2] == 'd' || ext[2] == 'D');
+}
+
+// ------------------------------------------------------------------------------------------------
+// Loader meta information
+const aiImporterDesc *B3DImporter::GetInfo() const {
+    return &desc;
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
+    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile));
+
+    // Check whether we can read from the file
+    if (file.get() == nullptr) {
+        throw DeadlyImportError("Failed to open B3D file ", pFile, ".");
+    }
+
+    // check whether the .b3d file is large enough to contain
+    // at least one chunk.
+    size_t fileSize = file->FileSize();
+    if (fileSize < 8) {
+        throw DeadlyImportError("B3D File is too small.");
+    }
+
+    _pos = 0;
+    _buf.resize(fileSize);
+    file->Read(&_buf[0], 1, fileSize);
+    _stack.clear();
+
+    ReadBB3D(pScene);
+}
+
+// ------------------------------------------------------------------------------------------------
+AI_WONT_RETURN void B3DImporter::Oops() {
+    throw DeadlyImportError("B3D Importer - INTERNAL ERROR");
+}
+
+// ------------------------------------------------------------------------------------------------
+AI_WONT_RETURN void B3DImporter::Fail(const string &str) {
+#ifdef DEBUG_B3D
+    ASSIMP_LOG_ERROR("Error in B3D file data: ", str);
+#endif
+    throw DeadlyImportError("B3D Importer - error in B3D file data: ", str);
+}
+
+// ------------------------------------------------------------------------------------------------
+int B3DImporter::ReadByte() {
+    if (_pos > _buf.size()) {
+        Fail("EOF");
+    }
+
+    return _buf[_pos++];
+}
+
+// ------------------------------------------------------------------------------------------------
+int B3DImporter::ReadInt() {
+    if (_pos + 4 > _buf.size()) {
+        Fail("EOF");
+    }
+
+    int n;
+    memcpy(&n, &_buf[_pos], 4);
+    _pos += 4;
+
+    return n;
+}
+
+// ------------------------------------------------------------------------------------------------
+float B3DImporter::ReadFloat() {
+    if (_pos + 4 > _buf.size()) {
+        Fail("EOF");
+    }
+
+    float n;
+    memcpy(&n, &_buf[_pos], 4);
+    _pos += 4;
+
+    return n;
+}
+
+// ------------------------------------------------------------------------------------------------
+aiVector2D B3DImporter::ReadVec2() {
+    float x = ReadFloat();
+    float y = ReadFloat();
+    return aiVector2D(x, y);
+}
+
+// ------------------------------------------------------------------------------------------------
+aiVector3D B3DImporter::ReadVec3() {
+    float x = ReadFloat();
+    float y = ReadFloat();
+    float z = ReadFloat();
+    return aiVector3D(x, y, z);
+}
+
+// ------------------------------------------------------------------------------------------------
+aiQuaternion B3DImporter::ReadQuat() {
+    // (aramis_acg) Fix to adapt the loader to changed quat orientation
+    float w = -ReadFloat();
+    float x = ReadFloat();
+    float y = ReadFloat();
+    float z = ReadFloat();
+    return aiQuaternion(w, x, y, z);
+}
+
+// ------------------------------------------------------------------------------------------------
+string B3DImporter::ReadString() {
+    if (_pos > _buf.size()) {
+        Fail("EOF");
+    }
+    string str;
+    while (_pos < _buf.size()) {
+        char c = (char)ReadByte();
+        if (!c) {
+            return str;
+        }
+        str += c;
+    }
+    return string();
+}
+
+// ------------------------------------------------------------------------------------------------
+string B3DImporter::ReadChunk() {
+    string tag;
+    for (int i = 0; i < 4; ++i) {
+        tag += char(ReadByte());
+    }
+#ifdef DEBUG_B3D
+    ASSIMP_LOG_DEBUG("ReadChunk: ", tag);
+#endif
+    unsigned sz = (unsigned)ReadInt();
+    _stack.push_back(_pos + sz);
+    return tag;
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ExitChunk() {
+    _pos = _stack.back();
+    _stack.pop_back();
+}
+
+// ------------------------------------------------------------------------------------------------
+size_t B3DImporter::ChunkSize() {
+    return _stack.back() - _pos;
+}
+// ------------------------------------------------------------------------------------------------
+
+template <class T>
+T *B3DImporter::to_array(const vector<T> &v) {
+    if (v.empty()) {
+        return 0;
+    }
+    T *p = new T[v.size()];
+    for (size_t i = 0; i < v.size(); ++i) {
+        p[i] = v[i];
+    }
+    return p;
+}
+
+// ------------------------------------------------------------------------------------------------
+template <class T>
+T **unique_to_array(vector<std::unique_ptr<T>> &v) {
+    if (v.empty()) {
+        return 0;
+    }
+    T **p = new T *[v.size()];
+    for (size_t i = 0; i < v.size(); ++i) {
+        p[i] = v[i].release();
+    }
+    return p;
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadTEXS() {
+    while (ChunkSize()) {
+        string name = ReadString();
+        /*int flags=*/ReadInt();
+        /*int blend=*/ReadInt();
+        /*aiVector2D pos=*/ReadVec2();
+        /*aiVector2D scale=*/ReadVec2();
+        /*float rot=*/ReadFloat();
+
+        _textures.push_back(name);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadBRUS() {
+    int n_texs = ReadInt();
+    if (n_texs < 0 || n_texs > 8) {
+        Fail("Bad texture count");
+    }
+    while (ChunkSize()) {
+        string name = ReadString();
+        aiVector3D color = ReadVec3();
+        float alpha = ReadFloat();
+        float shiny = ReadFloat();
+        /*int blend=**/ ReadInt();
+        int fx = ReadInt();
+
+        std::unique_ptr<aiMaterial> mat(new aiMaterial);
+
+        // Name
+        aiString ainame(name);
+        mat->AddProperty(&ainame, AI_MATKEY_NAME);
+
+        // Diffuse color
+        mat->AddProperty(&color, 1, AI_MATKEY_COLOR_DIFFUSE);
+
+        // Opacity
+        mat->AddProperty(&alpha, 1, AI_MATKEY_OPACITY);
+
+        // Specular color
+        aiColor3D speccolor(shiny, shiny, shiny);
+        mat->AddProperty(&speccolor, 1, AI_MATKEY_COLOR_SPECULAR);
+
+        // Specular power
+        float specpow = shiny * 128;
+        mat->AddProperty(&specpow, 1, AI_MATKEY_SHININESS);
+
+        // Double sided
+        if (fx & 0x10) {
+            int i = 1;
+            mat->AddProperty(&i, 1, AI_MATKEY_TWOSIDED);
+        }
+
+        //Textures
+        for (int i = 0; i < n_texs; ++i) {
+            int texid = ReadInt();
+            if (texid < -1 || (texid >= 0 && texid >= static_cast<int>(_textures.size()))) {
+                Fail("Bad texture id");
+            }
+            if (i == 0 && texid >= 0) {
+                aiString texname(_textures[texid]);
+                mat->AddProperty(&texname, AI_MATKEY_TEXTURE_DIFFUSE(0));
+            }
+        }
+        _materials.emplace_back(std::move(mat));
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadVRTS() {
+    _vflags = ReadInt();
+    _tcsets = ReadInt();
+    _tcsize = ReadInt();
+    if (_tcsets < 0 || _tcsets > 4 || _tcsize < 0 || _tcsize > 4) {
+        Fail("Bad texcoord data");
+    }
+
+    int sz = 12 + (_vflags & 1 ? 12 : 0) + (_vflags & 2 ? 16 : 0) + (_tcsets * _tcsize * 4);
+    size_t n_verts = ChunkSize() / sz;
+
+    int v0 = static_cast<int>(_vertices.size());
+    _vertices.resize(v0 + n_verts);
+
+    for (unsigned int i = 0; i < n_verts; ++i) {
+        Vertex &v = _vertices[v0 + i];
+
+        memset(v.bones, 0, sizeof(v.bones));
+        memset(v.weights, 0, sizeof(v.weights));
+
+        v.vertex = ReadVec3();
+
+        if (_vflags & 1) {
+            v.normal = ReadVec3();
+        }
+
+        if (_vflags & 2) {
+            ReadQuat(); //skip v 4bytes...
+        }
+
+        for (int j = 0; j < _tcsets; ++j) {
+            float t[4] = { 0, 0, 0, 0 };
+            for (int k = 0; k < _tcsize; ++k) {
+                t[k] = ReadFloat();
+            }
+            t[1] = 1 - t[1];
+            if (!j) {
+                v.texcoords = aiVector3D(t[0], t[1], t[2]);
+            }
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadTRIS(int v0) {
+    int matid = ReadInt();
+    if (matid == -1) {
+        matid = 0;
+    } else if (matid < 0 || matid >= (int)_materials.size()) {
+#ifdef DEBUG_B3D
+        ASSIMP_LOG_ERROR("material id=", matid);
+#endif
+        Fail("Bad material id");
+    }
+
+    std::unique_ptr<aiMesh> mesh(new aiMesh);
+
+    mesh->mMaterialIndex = matid;
+    mesh->mNumFaces = 0;
+    mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
+
+    size_t n_tris = ChunkSize() / 12;
+    aiFace *face = mesh->mFaces = new aiFace[n_tris];
+
+    for (unsigned int i = 0; i < n_tris; ++i) {
+        int i0 = ReadInt() + v0;
+        int i1 = ReadInt() + v0;
+        int i2 = ReadInt() + v0;
+        if (i0 < 0 || i0 >= (int)_vertices.size() || i1 < 0 || i1 >= (int)_vertices.size() || i2 < 0 || i2 >= (int)_vertices.size()) {
+#ifdef DEBUG_B3D
+            ASSIMP_LOG_ERROR("Bad triangle index: i0=", i0, ", i1=", i1, ", i2=", i2);
+#endif
+            Fail("Bad triangle index");
+            continue;
+        }
+        face->mNumIndices = 3;
+        face->mIndices = new unsigned[3];
+        face->mIndices[0] = i0;
+        face->mIndices[1] = i1;
+        face->mIndices[2] = i2;
+        ++mesh->mNumFaces;
+        ++face;
+    }
+
+    _meshes.emplace_back(std::move(mesh));
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadMESH() {
+    /*int matid=*/ReadInt();
+
+    int v0 = static_cast<int>(_vertices.size());
+
+    while (ChunkSize()) {
+        string t = ReadChunk();
+        if (t == "VRTS") {
+            ReadVRTS();
+        } else if (t == "TRIS") {
+            ReadTRIS(v0);
+        }
+        ExitChunk();
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadBONE(int id) {
+    while (ChunkSize()) {
+        int vertex = ReadInt();
+        float weight = ReadFloat();
+        if (vertex < 0 || vertex >= (int)_vertices.size()) {
+            Fail("Bad vertex index");
+        }
+
+        Vertex &v = _vertices[vertex];
+        for (int i = 0; i < 4; ++i) {
+            if (!v.weights[i]) {
+                v.bones[i] = static_cast<unsigned char>(id);
+                v.weights[i] = weight;
+                break;
+            }
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadKEYS(aiNodeAnim *nodeAnim) {
+    vector<aiVectorKey> trans, scale;
+    vector<aiQuatKey> rot;
+    int flags = ReadInt();
+    while (ChunkSize()) {
+        int frame = ReadInt();
+        if (flags & 1) {
+            trans.push_back(aiVectorKey(frame, ReadVec3()));
+        }
+        if (flags & 2) {
+            scale.push_back(aiVectorKey(frame, ReadVec3()));
+        }
+        if (flags & 4) {
+            rot.push_back(aiQuatKey(frame, ReadQuat()));
+        }
+    }
+
+    if (flags & 1) {
+        nodeAnim->mNumPositionKeys = static_cast<unsigned int>(trans.size());
+        nodeAnim->mPositionKeys = to_array(trans);
+    }
+
+    if (flags & 2) {
+        nodeAnim->mNumScalingKeys = static_cast<unsigned int>(scale.size());
+        nodeAnim->mScalingKeys = to_array(scale);
+    }
+
+    if (flags & 4) {
+        nodeAnim->mNumRotationKeys = static_cast<unsigned int>(rot.size());
+        nodeAnim->mRotationKeys = to_array(rot);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadANIM() {
+    /*int flags=*/ReadInt();
+    int frames = ReadInt();
+    float fps = ReadFloat();
+
+    std::unique_ptr<aiAnimation> anim(new aiAnimation);
+
+    anim->mDuration = frames;
+    anim->mTicksPerSecond = fps;
+    _animations.emplace_back(std::move(anim));
+}
+
+// ------------------------------------------------------------------------------------------------
+aiNode *B3DImporter::ReadNODE(aiNode *parent) {
+
+    string name = ReadString();
+    aiVector3D t = ReadVec3();
+    aiVector3D s = ReadVec3();
+    aiQuaternion r = ReadQuat();
+
+    aiMatrix4x4 trans, scale, rot;
+
+    aiMatrix4x4::Translation(t, trans);
+    aiMatrix4x4::Scaling(s, scale);
+    rot = aiMatrix4x4(r.GetMatrix());
+
+    aiMatrix4x4 tform = trans * rot * scale;
+
+    int nodeid = static_cast<int>(_nodes.size());
+
+    aiNode *node = new aiNode(name);
+    _nodes.push_back(node);
+
+    node->mParent = parent;
+    node->mTransformation = tform;
+
+    std::unique_ptr<aiNodeAnim> nodeAnim;
+    vector<unsigned> meshes;
+    vector<aiNode *> children;
+
+    while (ChunkSize()) {
+        const string chunk = ReadChunk();
+        if (chunk == "MESH") {
+            unsigned int n = static_cast<unsigned int>(_meshes.size());
+            ReadMESH();
+            for (unsigned int i = n; i < static_cast<unsigned int>(_meshes.size()); ++i) {
+                meshes.push_back(i);
+            }
+        } else if (chunk == "BONE") {
+            ReadBONE(nodeid);
+        } else if (chunk == "ANIM") {
+            ReadANIM();
+        } else if (chunk == "KEYS") {
+            if (!nodeAnim) {
+                nodeAnim.reset(new aiNodeAnim);
+                nodeAnim->mNodeName = node->mName;
+            }
+            ReadKEYS(nodeAnim.get());
+        } else if (chunk == "NODE") {
+            aiNode *child = ReadNODE(node);
+            children.push_back(child);
+        }
+        ExitChunk();
+    }
+
+    if (nodeAnim) {
+        _nodeAnims.emplace_back(std::move(nodeAnim));
+    }
+
+    node->mNumMeshes = static_cast<unsigned int>(meshes.size());
+    node->mMeshes = to_array(meshes);
+
+    node->mNumChildren = static_cast<unsigned int>(children.size());
+    node->mChildren = to_array(children);
+
+    return node;
+}
+
+// ------------------------------------------------------------------------------------------------
+void B3DImporter::ReadBB3D(aiScene *scene) {
+
+    _textures.clear();
+
+    _materials.clear();
+
+    _vertices.clear();
+
+    _meshes.clear();
+
+    DeleteAllBarePointers(_nodes);
+    _nodes.clear();
+
+    _nodeAnims.clear();
+
+    _animations.clear();
+
+    string t = ReadChunk();
+    if (t == "BB3D") {
+        int version = ReadInt();
+
+        if (!DefaultLogger::isNullLogger()) {
+            char dmp[128];
+            ai_snprintf(dmp, 128, "B3D file format version: %i", version);
+            ASSIMP_LOG_INFO(dmp);
+        }
+
+        while (ChunkSize()) {
+            const string chunk = ReadChunk();
+            if (chunk == "TEXS") {
+                ReadTEXS();
+            } else if (chunk == "BRUS") {
+                ReadBRUS();
+            } else if (chunk == "NODE") {
+                ReadNODE(0);
+            }
+            ExitChunk();
+        }
+    }
+    ExitChunk();
+
+    if (!_nodes.size()) {
+        Fail("No nodes");
+    }
+
+    if (!_meshes.size()) {
+        Fail("No meshes");
+    }
+
+    // Fix nodes/meshes/bones
+    for (size_t i = 0; i < _nodes.size(); ++i) {
+        aiNode *node = _nodes[i];
+
+        for (size_t j = 0; j < node->mNumMeshes; ++j) {
+            aiMesh *mesh = _meshes[node->mMeshes[j]].get();
+
+            int n_tris = mesh->mNumFaces;
+            int n_verts = mesh->mNumVertices = n_tris * 3;
+
+            aiVector3D *mv = mesh->mVertices = new aiVector3D[n_verts], *mn = 0, *mc = 0;
+            if (_vflags & 1) {
+                mn = mesh->mNormals = new aiVector3D[n_verts];
+            }
+            if (_tcsets) {
+                mc = mesh->mTextureCoords[0] = new aiVector3D[n_verts];
+            }
+
+            aiFace *face = mesh->mFaces;
+
+            vector<vector<aiVertexWeight>> vweights(_nodes.size());
+
+            for (int vertIdx = 0; vertIdx < n_verts; vertIdx += 3) {
+                for (int faceIndex = 0; faceIndex < 3; ++faceIndex) {
+                    Vertex &v = _vertices[face->mIndices[faceIndex]];
+
+                    *mv++ = v.vertex;
+                    if (mn) *mn++ = v.normal;
+                    if (mc) *mc++ = v.texcoords;
+
+                    face->mIndices[faceIndex] = vertIdx + faceIndex;
+
+                    for (int k = 0; k < 4; ++k) {
+                        if (!v.weights[k])
+                            break;
+
+                        int bone = v.bones[k];
+                        float weight = v.weights[k];
+
+                        vweights[bone].push_back(aiVertexWeight(vertIdx + faceIndex, weight));
+                    }
+                }
+                ++face;
+            }
+
+            vector<aiBone *> bones;
+            for (size_t weightIndx = 0; weightIndx < vweights.size(); ++weightIndx) {
+                vector<aiVertexWeight> &weights = vweights[weightIndx];
+                if (!weights.size()) {
+                    continue;
+                }
+
+                aiBone *bone = new aiBone;
+                bones.push_back(bone);
+
+                aiNode *bnode = _nodes[weightIndx];
+
+                bone->mName = bnode->mName;
+                bone->mNumWeights = static_cast<unsigned int>(weights.size());
+                bone->mWeights = to_array(weights);
+
+                aiMatrix4x4 mat = bnode->mTransformation;
+                while (bnode->mParent) {
+                    bnode = bnode->mParent;
+                    mat = bnode->mTransformation * mat;
+                }
+                bone->mOffsetMatrix = mat.Inverse();
+            }
+            mesh->mNumBones = static_cast<unsigned int>(bones.size());
+            mesh->mBones = to_array(bones);
+        }
+    }
+
+    //nodes
+    scene->mRootNode = _nodes[0];
+    _nodes.clear(); // node ownership now belongs to scene
+
+    //material
+    if (!_materials.size()) {
+        _materials.emplace_back(std::unique_ptr<aiMaterial>(new aiMaterial));
+    }
+    scene->mNumMaterials = static_cast<unsigned int>(_materials.size());
+    scene->mMaterials = unique_to_array(_materials);
+
+    //meshes
+    scene->mNumMeshes = static_cast<unsigned int>(_meshes.size());
+    scene->mMeshes = unique_to_array(_meshes);
+
+    //animations
+    if (_animations.size() == 1 && _nodeAnims.size()) {
+
+        aiAnimation *anim = _animations.back().get();
+        anim->mNumChannels = static_cast<unsigned int>(_nodeAnims.size());
+        anim->mChannels = unique_to_array(_nodeAnims);
+
+        scene->mNumAnimations = static_cast<unsigned int>(_animations.size());
+        scene->mAnimations = unique_to_array(_animations);
+    }
+
+    // convert to RH
+    MakeLeftHandedProcess makeleft;
+    makeleft.Execute(scene);
+
+    FlipWindingOrderProcess flip;
+    flip.Execute(scene);
+}
+
+#endif // !! ASSIMP_BUILD_NO_B3D_IMPORTER
diff --git a/src/mesh/assimp-master/code/AssetLib/B3D/B3DImporter.h b/src/mesh/assimp-master/code/AssetLib/B3D/B3DImporter.h
new file mode 100644
index 0000000..e47d907
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/B3D/B3DImporter.h
@@ -0,0 +1,132 @@
+/*
+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 Definition of the .b3d importer class.
+ */
+#pragma once
+#ifndef AI_B3DIMPORTER_H_INC
+#define AI_B3DIMPORTER_H_INC
+
+#include <assimp/types.h>
+#include <assimp/mesh.h>
+#include <assimp/material.h>
+#include <assimp/BaseImporter.h>
+
+#include <memory>
+#include <vector>
+
+struct aiNodeAnim;
+struct aiNode;
+struct aiAnimation;
+
+namespace Assimp{
+
+class B3DImporter : public BaseImporter{
+public:
+    B3DImporter() = default;
+    ~B3DImporter() 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:
+
+    int ReadByte();
+    int ReadInt();
+    float ReadFloat();
+    aiVector2D ReadVec2();
+    aiVector3D ReadVec3();
+    aiQuaternion ReadQuat();
+    std::string ReadString();
+    std::string ReadChunk();
+    void ExitChunk();
+    size_t ChunkSize();
+
+    template<class T>
+    T *to_array( const std::vector<T> &v );
+
+    struct Vertex{
+        aiVector3D vertex;
+        aiVector3D normal;
+        aiVector3D texcoords;
+        unsigned char bones[4];
+        float weights[4];
+    };
+
+    AI_WONT_RETURN void Oops() AI_WONT_RETURN_SUFFIX;
+    AI_WONT_RETURN void Fail(const std::string &str) AI_WONT_RETURN_SUFFIX;
+
+    void ReadTEXS();
+    void ReadBRUS();
+
+    void ReadVRTS();
+    void ReadTRIS( int v0 );
+    void ReadMESH();
+    void ReadBONE( int id );
+    void ReadKEYS( aiNodeAnim *nodeAnim );
+    void ReadANIM();
+
+    aiNode *ReadNODE( aiNode *parent );
+
+    void ReadBB3D( aiScene *scene );
+
+    size_t _pos;
+    std::vector<unsigned char> _buf;
+    std::vector<size_t> _stack;
+
+    std::vector<std::string> _textures;
+    std::vector<std::unique_ptr<aiMaterial> > _materials;
+
+    int _vflags,_tcsets,_tcsize;
+    std::vector<Vertex> _vertices;
+
+    std::vector<aiNode*> _nodes;
+    std::vector<std::unique_ptr<aiMesh> > _meshes;
+    std::vector<std::unique_ptr<aiNodeAnim> > _nodeAnims;
+    std::vector<std::unique_ptr<aiAnimation> > _animations;
+};
+
+}
+
+#endif