add assimp submodule

6 files changed, 3816 insertions, 0 deletions

diff --git a/src/mesh/assimp-master/code/AssetLib/3DS/3DSConverter.cpp b/src/mesh/assimp-master/code/AssetLib/3DS/3DSConverter.cpp
new file mode 100644
index 0000000..5a01429
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/3DS/3DSConverter.cpp
@@ -0,0 +1,807 @@
+/*
+---------------------------------------------------------------------------
+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 Implementation of the 3ds importer class */
+
+#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER
+
+// internal headers
+#include "3DSLoader.h"
+#include "Common/TargetAnimation.h"
+#include <assimp/StringComparison.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+#include <cctype>
+#include <memory>
+
+using namespace Assimp;
+
+static const unsigned int NotSet = 0xcdcdcdcd;
+
+// ------------------------------------------------------------------------------------------------
+// Setup final material indices, generae a default material if necessary
+void Discreet3DSImporter::ReplaceDefaultMaterial() {
+    // Try to find an existing material that matches the
+    // typical default material setting:
+    // - no textures
+    // - diffuse color (in grey!)
+    // NOTE: This is here to workaround the fact that some
+    // exporters are writing a default material, too.
+    unsigned int idx(NotSet);
+    for (unsigned int i = 0; i < mScene->mMaterials.size(); ++i) {
+        std::string s = mScene->mMaterials[i].mName;
+        for (char & it : s) {
+            it = static_cast<char>(::tolower(static_cast<unsigned char>(it)));
+        }
+
+        if (std::string::npos == s.find("default")) continue;
+
+        if (mScene->mMaterials[i].mDiffuse.r !=
+                        mScene->mMaterials[i].mDiffuse.g ||
+                mScene->mMaterials[i].mDiffuse.r !=
+                        mScene->mMaterials[i].mDiffuse.b) continue;
+
+        if (ContainsTextures(i)) {
+            continue;
+        }
+        idx = i;
+    }
+    if (NotSet == idx) {
+        idx = (unsigned int)mScene->mMaterials.size();
+    }
+
+    // now iterate through all meshes and through all faces and
+    // find all faces that are using the default material
+    unsigned int cnt = 0;
+    for (std::vector<D3DS::Mesh>::iterator
+                    i = mScene->mMeshes.begin();
+            i != mScene->mMeshes.end(); ++i) {
+        for (std::vector<unsigned int>::iterator
+                        a = (*i).mFaceMaterials.begin();
+                a != (*i).mFaceMaterials.end(); ++a) {
+            // NOTE: The additional check seems to be necessary,
+            // some exporters seem to generate invalid data here
+            if (0xcdcdcdcd == (*a)) {
+                (*a) = idx;
+                ++cnt;
+            } else if ((*a) >= mScene->mMaterials.size()) {
+                (*a) = idx;
+                ASSIMP_LOG_WARN("Material index overflow in 3DS file. Using default material");
+                ++cnt;
+            }
+        }
+    }
+    if (cnt && idx == mScene->mMaterials.size()) {
+        // We need to create our own default material
+        D3DS::Material sMat("%%%DEFAULT");
+        sMat.mDiffuse = aiColor3D(0.3f, 0.3f, 0.3f);
+        mScene->mMaterials.push_back(sMat);
+
+        ASSIMP_LOG_INFO("3DS: Generating default material");
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Check whether all indices are valid. Otherwise we'd crash before the validation step is reached
+void Discreet3DSImporter::CheckIndices(D3DS::Mesh &sMesh) {
+    for (std::vector<D3DS::Face>::iterator i = sMesh.mFaces.begin(); i != sMesh.mFaces.end(); ++i) {
+        // check whether all indices are in range
+        for (unsigned int a = 0; a < 3; ++a) {
+            if ((*i).mIndices[a] >= sMesh.mPositions.size()) {
+                ASSIMP_LOG_WARN("3DS: Vertex index overflow)");
+                (*i).mIndices[a] = (uint32_t)sMesh.mPositions.size() - 1;
+            }
+            if (!sMesh.mTexCoords.empty() && (*i).mIndices[a] >= sMesh.mTexCoords.size()) {
+                ASSIMP_LOG_WARN("3DS: Texture coordinate index overflow)");
+                (*i).mIndices[a] = (uint32_t)sMesh.mTexCoords.size() - 1;
+            }
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Generate out unique verbose format representation
+void Discreet3DSImporter::MakeUnique(D3DS::Mesh &sMesh) {
+    // TODO: really necessary? I don't think. Just a waste of memory and time
+    // to do it now in a separate buffer.
+
+    // Allocate output storage
+    std::vector<aiVector3D> vNew(sMesh.mFaces.size() * 3);
+    std::vector<aiVector3D> vNew2;
+    if (sMesh.mTexCoords.size())
+        vNew2.resize(sMesh.mFaces.size() * 3);
+
+    for (unsigned int i = 0, base = 0; i < sMesh.mFaces.size(); ++i) {
+        D3DS::Face &face = sMesh.mFaces[i];
+
+        // Positions
+        for (unsigned int a = 0; a < 3; ++a, ++base) {
+            vNew[base] = sMesh.mPositions[face.mIndices[a]];
+            if (sMesh.mTexCoords.size())
+                vNew2[base] = sMesh.mTexCoords[face.mIndices[a]];
+
+            face.mIndices[a] = base;
+        }
+    }
+    sMesh.mPositions = vNew;
+    sMesh.mTexCoords = vNew2;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Convert a 3DS texture to texture keys in an aiMaterial
+void CopyTexture(aiMaterial &mat, D3DS::Texture &texture, aiTextureType type) {
+    // Setup the texture name
+    aiString tex;
+    tex.Set(texture.mMapName);
+    mat.AddProperty(&tex, AI_MATKEY_TEXTURE(type, 0));
+
+    // Setup the texture blend factor
+    if (is_not_qnan(texture.mTextureBlend))
+        mat.AddProperty<ai_real>(&texture.mTextureBlend, 1, AI_MATKEY_TEXBLEND(type, 0));
+
+    // Setup the texture mapping mode
+    int mapMode = static_cast<int>(texture.mMapMode);
+    mat.AddProperty<int>(&mapMode, 1, AI_MATKEY_MAPPINGMODE_U(type, 0));
+    mat.AddProperty<int>(&mapMode, 1, AI_MATKEY_MAPPINGMODE_V(type, 0));
+
+    // Mirroring - double the scaling values
+    // FIXME: this is not really correct ...
+    if (texture.mMapMode == aiTextureMapMode_Mirror) {
+        texture.mScaleU *= 2.0;
+        texture.mScaleV *= 2.0;
+        texture.mOffsetU /= 2.0;
+        texture.mOffsetV /= 2.0;
+    }
+
+    // Setup texture UV transformations
+    mat.AddProperty<ai_real>(&texture.mOffsetU, 5, AI_MATKEY_UVTRANSFORM(type, 0));
+}
+
+// ------------------------------------------------------------------------------------------------
+// Convert a 3DS material to an aiMaterial
+void Discreet3DSImporter::ConvertMaterial(D3DS::Material &oldMat,
+        aiMaterial &mat) {
+    // NOTE: Pass the background image to the viewer by bypassing the
+    // material system. This is an evil hack, never do it again!
+    if (0 != mBackgroundImage.length() && bHasBG) {
+        aiString tex;
+        tex.Set(mBackgroundImage);
+        mat.AddProperty(&tex, AI_MATKEY_GLOBAL_BACKGROUND_IMAGE);
+
+        // Be sure this is only done for the first material
+        mBackgroundImage = std::string();
+    }
+
+    // At first add the base ambient color of the scene to the material
+    oldMat.mAmbient.r += mClrAmbient.r;
+    oldMat.mAmbient.g += mClrAmbient.g;
+    oldMat.mAmbient.b += mClrAmbient.b;
+
+    aiString name;
+    name.Set(oldMat.mName);
+    mat.AddProperty(&name, AI_MATKEY_NAME);
+
+    // Material colors
+    mat.AddProperty(&oldMat.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
+    mat.AddProperty(&oldMat.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
+    mat.AddProperty(&oldMat.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
+    mat.AddProperty(&oldMat.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);
+
+    // Phong shininess and shininess strength
+    if (D3DS::Discreet3DS::Phong == oldMat.mShading ||
+            D3DS::Discreet3DS::Metal == oldMat.mShading) {
+        if (!oldMat.mSpecularExponent || !oldMat.mShininessStrength) {
+            oldMat.mShading = D3DS::Discreet3DS::Gouraud;
+        } else {
+            mat.AddProperty(&oldMat.mSpecularExponent, 1, AI_MATKEY_SHININESS);
+            mat.AddProperty(&oldMat.mShininessStrength, 1, AI_MATKEY_SHININESS_STRENGTH);
+        }
+    }
+
+    // Opacity
+    mat.AddProperty<ai_real>(&oldMat.mTransparency, 1, AI_MATKEY_OPACITY);
+
+    // Bump height scaling
+    mat.AddProperty<ai_real>(&oldMat.mBumpHeight, 1, AI_MATKEY_BUMPSCALING);
+
+    // Two sided rendering?
+    if (oldMat.mTwoSided) {
+        int i = 1;
+        mat.AddProperty<int>(&i, 1, AI_MATKEY_TWOSIDED);
+    }
+
+    // Shading mode
+    aiShadingMode eShading = aiShadingMode_NoShading;
+    switch (oldMat.mShading) {
+    case D3DS::Discreet3DS::Flat:
+        eShading = aiShadingMode_Flat;
+        break;
+
+    // I don't know what "Wire" shading should be,
+    // assume it is simple lambertian diffuse shading
+    case D3DS::Discreet3DS::Wire: {
+        // Set the wireframe flag
+        unsigned int iWire = 1;
+        mat.AddProperty<int>((int *)&iWire, 1, AI_MATKEY_ENABLE_WIREFRAME);
+    }
+
+    case D3DS::Discreet3DS::Gouraud:
+        eShading = aiShadingMode_Gouraud;
+        break;
+
+    // assume cook-torrance shading for metals.
+    case D3DS::Discreet3DS::Phong:
+        eShading = aiShadingMode_Phong;
+        break;
+
+    case D3DS::Discreet3DS::Metal:
+        eShading = aiShadingMode_CookTorrance;
+        break;
+
+        // FIX to workaround a warning with GCC 4 who complained
+        // about a missing case Blinn: here - Blinn isn't a valid
+        // value in the 3DS Loader, it is just needed for ASE
+    case D3DS::Discreet3DS::Blinn:
+        eShading = aiShadingMode_Blinn;
+        break;
+    }
+    int eShading_ = static_cast<int>(eShading);
+    mat.AddProperty<int>(&eShading_, 1, AI_MATKEY_SHADING_MODEL);
+
+    // DIFFUSE texture
+    if (oldMat.sTexDiffuse.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexDiffuse, aiTextureType_DIFFUSE);
+
+    // SPECULAR texture
+    if (oldMat.sTexSpecular.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexSpecular, aiTextureType_SPECULAR);
+
+    // OPACITY texture
+    if (oldMat.sTexOpacity.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexOpacity, aiTextureType_OPACITY);
+
+    // EMISSIVE texture
+    if (oldMat.sTexEmissive.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexEmissive, aiTextureType_EMISSIVE);
+
+    // BUMP texture
+    if (oldMat.sTexBump.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexBump, aiTextureType_HEIGHT);
+
+    // SHININESS texture
+    if (oldMat.sTexShininess.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexShininess, aiTextureType_SHININESS);
+
+    // REFLECTION texture
+    if (oldMat.sTexReflective.mMapName.length() > 0)
+        CopyTexture(mat, oldMat.sTexReflective, aiTextureType_REFLECTION);
+
+    // Store the name of the material itself, too
+    if (oldMat.mName.length()) {
+        aiString tex;
+        tex.Set(oldMat.mName);
+        mat.AddProperty(&tex, AI_MATKEY_NAME);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Split meshes by their materials and generate output aiMesh'es
+void Discreet3DSImporter::ConvertMeshes(aiScene *pcOut) {
+    std::vector<aiMesh *> avOutMeshes;
+    avOutMeshes.reserve(mScene->mMeshes.size() * 2);
+
+    unsigned int iFaceCnt = 0, num = 0;
+    aiString name;
+
+    // we need to split all meshes by their materials
+    for (std::vector<D3DS::Mesh>::iterator i = mScene->mMeshes.begin(); i != mScene->mMeshes.end(); ++i) {
+        std::unique_ptr<std::vector<unsigned int>[]> aiSplit(new std::vector<unsigned int>[mScene->mMaterials.size()]);
+
+        name.length = ASSIMP_itoa10(name.data, num++);
+
+        unsigned int iNum = 0;
+        for (std::vector<unsigned int>::const_iterator a = (*i).mFaceMaterials.begin();
+                a != (*i).mFaceMaterials.end(); ++a, ++iNum) {
+            aiSplit[*a].push_back(iNum);
+        }
+        // now generate submeshes
+        for (unsigned int p = 0; p < mScene->mMaterials.size(); ++p) {
+            if (aiSplit[p].empty()) {
+                continue;
+            }
+            aiMesh *meshOut = new aiMesh();
+            meshOut->mName = name;
+            meshOut->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
+
+            // be sure to setup the correct material index
+            meshOut->mMaterialIndex = p;
+
+            // use the color data as temporary storage
+            meshOut->mColors[0] = (aiColor4D *)(&*i);
+            avOutMeshes.push_back(meshOut);
+
+            // convert vertices
+            meshOut->mNumFaces = (unsigned int)aiSplit[p].size();
+            meshOut->mNumVertices = meshOut->mNumFaces * 3;
+
+            // allocate enough storage for faces
+            meshOut->mFaces = new aiFace[meshOut->mNumFaces];
+            iFaceCnt += meshOut->mNumFaces;
+
+            meshOut->mVertices = new aiVector3D[meshOut->mNumVertices];
+            meshOut->mNormals = new aiVector3D[meshOut->mNumVertices];
+            if ((*i).mTexCoords.size()) {
+                meshOut->mTextureCoords[0] = new aiVector3D[meshOut->mNumVertices];
+            }
+            for (unsigned int q = 0, base = 0; q < aiSplit[p].size(); ++q) {
+                unsigned int index = aiSplit[p][q];
+                aiFace &face = meshOut->mFaces[q];
+
+                face.mIndices = new unsigned int[3];
+                face.mNumIndices = 3;
+
+                for (unsigned int a = 0; a < 3; ++a, ++base) {
+                    unsigned int idx = (*i).mFaces[index].mIndices[a];
+                    meshOut->mVertices[base] = (*i).mPositions[idx];
+                    meshOut->mNormals[base] = (*i).mNormals[idx];
+
+                    if ((*i).mTexCoords.size())
+                        meshOut->mTextureCoords[0][base] = (*i).mTexCoords[idx];
+
+                    face.mIndices[a] = base;
+                }
+            }
+        }
+    }
+
+    // Copy them to the output array
+    pcOut->mNumMeshes = (unsigned int)avOutMeshes.size();
+    pcOut->mMeshes = new aiMesh *[pcOut->mNumMeshes]();
+    for (unsigned int a = 0; a < pcOut->mNumMeshes; ++a) {
+        pcOut->mMeshes[a] = avOutMeshes[a];
+    }
+
+    // We should have at least one face here
+    if (!iFaceCnt) {
+        throw DeadlyImportError("No faces loaded. The mesh is empty");
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Add a node to the scenegraph and setup its final transformation
+void Discreet3DSImporter::AddNodeToGraph(aiScene *pcSOut, aiNode *pcOut,
+        D3DS::Node *pcIn, aiMatrix4x4 & /*absTrafo*/) {
+    std::vector<unsigned int> iArray;
+    iArray.reserve(3);
+
+    aiMatrix4x4 abs;
+
+    // Find all meshes with the same name as the node
+    for (unsigned int a = 0; a < pcSOut->mNumMeshes; ++a) {
+        const D3DS::Mesh *pcMesh = (const D3DS::Mesh *)pcSOut->mMeshes[a]->mColors[0];
+        ai_assert(nullptr != pcMesh);
+
+        if (pcIn->mName == pcMesh->mName)
+            iArray.push_back(a);
+    }
+    if (!iArray.empty()) {
+        // The matrix should be identical for all meshes with the
+        // same name. It HAS to be identical for all meshes .....
+        D3DS::Mesh *imesh = ((D3DS::Mesh *)pcSOut->mMeshes[iArray[0]]->mColors[0]);
+
+        // Compute the inverse of the transformation matrix to move the
+        // vertices back to their relative and local space
+        aiMatrix4x4 mInv = imesh->mMat, mInvTransposed = imesh->mMat;
+        mInv.Inverse();
+        mInvTransposed.Transpose();
+        aiVector3D pivot = pcIn->vPivot;
+
+        pcOut->mNumMeshes = (unsigned int)iArray.size();
+        pcOut->mMeshes = new unsigned int[iArray.size()];
+        for (unsigned int i = 0; i < iArray.size(); ++i) {
+            const unsigned int iIndex = iArray[i];
+            aiMesh *const mesh = pcSOut->mMeshes[iIndex];
+
+            if (mesh->mColors[1] == nullptr) {
+                // Transform the vertices back into their local space
+                // fixme: consider computing normals after this, so we don't need to transform them
+                const aiVector3D *const pvEnd = mesh->mVertices + mesh->mNumVertices;
+                aiVector3D *pvCurrent = mesh->mVertices, *t2 = mesh->mNormals;
+
+                for (; pvCurrent != pvEnd; ++pvCurrent, ++t2) {
+                    *pvCurrent = mInv * (*pvCurrent);
+                    *t2 = mInvTransposed * (*t2);
+                }
+
+                // Handle negative transformation matrix determinant -> invert vertex x
+                if (imesh->mMat.Determinant() < 0.0f) {
+                    /* we *must* have normals */
+                    for (pvCurrent = mesh->mVertices, t2 = mesh->mNormals; pvCurrent != pvEnd; ++pvCurrent, ++t2) {
+                        pvCurrent->x *= -1.f;
+                        t2->x *= -1.f;
+                    }
+                    ASSIMP_LOG_INFO("3DS: Flipping mesh X-Axis");
+                }
+
+                // Handle pivot point
+                if (pivot.x || pivot.y || pivot.z) {
+                    for (pvCurrent = mesh->mVertices; pvCurrent != pvEnd; ++pvCurrent) {
+                        *pvCurrent -= pivot;
+                    }
+                }
+
+                mesh->mColors[1] = (aiColor4D *)1;
+            } else
+                mesh->mColors[1] = (aiColor4D *)1;
+
+            // Setup the mesh index
+            pcOut->mMeshes[i] = iIndex;
+        }
+    }
+
+    // Setup the name of the node
+    // First instance keeps its name otherwise something might break, all others will be postfixed with their instance number
+    if (pcIn->mInstanceNumber > 1) {
+        char tmp[12];
+        ASSIMP_itoa10(tmp, pcIn->mInstanceNumber);
+        std::string tempStr = pcIn->mName + "_inst_";
+        tempStr += tmp;
+        pcOut->mName.Set(tempStr);
+    } else
+        pcOut->mName.Set(pcIn->mName);
+
+    // Now build the transformation matrix of the node
+    // ROTATION
+    if (pcIn->aRotationKeys.size()) {
+
+        // FIX to get to Assimp's quaternion conventions
+        for (std::vector<aiQuatKey>::iterator it = pcIn->aRotationKeys.begin(); it != pcIn->aRotationKeys.end(); ++it) {
+            (*it).mValue.w *= -1.f;
+        }
+
+        pcOut->mTransformation = aiMatrix4x4(pcIn->aRotationKeys[0].mValue.GetMatrix());
+    } else if (pcIn->aCameraRollKeys.size()) {
+        aiMatrix4x4::RotationZ(AI_DEG_TO_RAD(-pcIn->aCameraRollKeys[0].mValue),
+                pcOut->mTransformation);
+    }
+
+    // SCALING
+    aiMatrix4x4 &m = pcOut->mTransformation;
+    if (pcIn->aScalingKeys.size()) {
+        const aiVector3D &v = pcIn->aScalingKeys[0].mValue;
+        m.a1 *= v.x;
+        m.b1 *= v.x;
+        m.c1 *= v.x;
+        m.a2 *= v.y;
+        m.b2 *= v.y;
+        m.c2 *= v.y;
+        m.a3 *= v.z;
+        m.b3 *= v.z;
+        m.c3 *= v.z;
+    }
+
+    // TRANSLATION
+    if (pcIn->aPositionKeys.size()) {
+        const aiVector3D &v = pcIn->aPositionKeys[0].mValue;
+        m.a4 += v.x;
+        m.b4 += v.y;
+        m.c4 += v.z;
+    }
+
+    // Generate animation channels for the node
+    if (pcIn->aPositionKeys.size() > 1 || pcIn->aRotationKeys.size() > 1 ||
+            pcIn->aScalingKeys.size() > 1 || pcIn->aCameraRollKeys.size() > 1 ||
+            pcIn->aTargetPositionKeys.size() > 1) {
+        aiAnimation *anim = pcSOut->mAnimations[0];
+        ai_assert(nullptr != anim);
+
+        if (pcIn->aCameraRollKeys.size() > 1) {
+            ASSIMP_LOG_VERBOSE_DEBUG("3DS: Converting camera roll track ...");
+
+            // Camera roll keys - in fact they're just rotations
+            // around the camera's z axis. The angles are given
+            // in degrees (and they're clockwise).
+            pcIn->aRotationKeys.resize(pcIn->aCameraRollKeys.size());
+            for (unsigned int i = 0; i < pcIn->aCameraRollKeys.size(); ++i) {
+                aiQuatKey &q = pcIn->aRotationKeys[i];
+                aiFloatKey &f = pcIn->aCameraRollKeys[i];
+
+                q.mTime = f.mTime;
+
+                // FIX to get to Assimp quaternion conventions
+                q.mValue = aiQuaternion(0.f, 0.f, AI_DEG_TO_RAD(/*-*/ f.mValue));
+            }
+        }
+#if 0
+        if (pcIn->aTargetPositionKeys.size() > 1)
+        {
+            ASSIMP_LOG_VERBOSE_DEBUG("3DS: Converting target track ...");
+
+            // Camera or spot light - need to convert the separate
+            // target position channel to our representation
+            TargetAnimationHelper helper;
+
+            if (pcIn->aPositionKeys.empty())
+            {
+                // We can just pass zero here ...
+                helper.SetFixedMainAnimationChannel(aiVector3D());
+            }
+            else  helper.SetMainAnimationChannel(&pcIn->aPositionKeys);
+            helper.SetTargetAnimationChannel(&pcIn->aTargetPositionKeys);
+
+            // Do the conversion
+            std::vector<aiVectorKey> distanceTrack;
+            helper.Process(&distanceTrack);
+
+            // Now add a new node as child, name it <ourName>.Target
+            // and assign the distance track to it. This is that the
+            // information where the target is and how it moves is
+            // not lost
+            D3DS::Node* nd = new D3DS::Node();
+            pcIn->push_back(nd);
+
+            nd->mName = pcIn->mName + ".Target";
+
+            aiNodeAnim* nda = anim->mChannels[anim->mNumChannels++] = new aiNodeAnim();
+            nda->mNodeName.Set(nd->mName);
+
+            nda->mNumPositionKeys = (unsigned int)distanceTrack.size();
+            nda->mPositionKeys = new aiVectorKey[nda->mNumPositionKeys];
+            ::memcpy(nda->mPositionKeys,&distanceTrack[0],
+                sizeof(aiVectorKey)*nda->mNumPositionKeys);
+        }
+#endif
+
+        // Cameras or lights define their transformation in their parent node and in the
+        // corresponding light or camera chunks. However, we read and process the latter
+        // to to be able to return valid cameras/lights even if no scenegraph is given.
+        for (unsigned int n = 0; n < pcSOut->mNumCameras; ++n) {
+            if (pcSOut->mCameras[n]->mName == pcOut->mName) {
+                pcSOut->mCameras[n]->mLookAt = aiVector3D(0.f, 0.f, 1.f);
+            }
+        }
+        for (unsigned int n = 0; n < pcSOut->mNumLights; ++n) {
+            if (pcSOut->mLights[n]->mName == pcOut->mName) {
+                pcSOut->mLights[n]->mDirection = aiVector3D(0.f, 0.f, 1.f);
+            }
+        }
+
+        // Allocate a new node anim and setup its name
+        aiNodeAnim *nda = anim->mChannels[anim->mNumChannels++] = new aiNodeAnim();
+        nda->mNodeName.Set(pcIn->mName);
+
+        // POSITION keys
+        if (pcIn->aPositionKeys.size() > 0) {
+            nda->mNumPositionKeys = (unsigned int)pcIn->aPositionKeys.size();
+            nda->mPositionKeys = new aiVectorKey[nda->mNumPositionKeys];
+            ::memcpy(nda->mPositionKeys, &pcIn->aPositionKeys[0],
+                    sizeof(aiVectorKey) * nda->mNumPositionKeys);
+        }
+
+        // ROTATION keys
+        if (pcIn->aRotationKeys.size() > 0) {
+            nda->mNumRotationKeys = (unsigned int)pcIn->aRotationKeys.size();
+            nda->mRotationKeys = new aiQuatKey[nda->mNumRotationKeys];
+
+            // Rotations are quaternion offsets
+            aiQuaternion abs1;
+            for (unsigned int n = 0; n < nda->mNumRotationKeys; ++n) {
+                const aiQuatKey &q = pcIn->aRotationKeys[n];
+
+                abs1 = (n ? abs1 * q.mValue : q.mValue);
+                nda->mRotationKeys[n].mTime = q.mTime;
+                nda->mRotationKeys[n].mValue = abs1.Normalize();
+            }
+        }
+
+        // SCALING keys
+        if (pcIn->aScalingKeys.size() > 0) {
+            nda->mNumScalingKeys = (unsigned int)pcIn->aScalingKeys.size();
+            nda->mScalingKeys = new aiVectorKey[nda->mNumScalingKeys];
+            ::memcpy(nda->mScalingKeys, &pcIn->aScalingKeys[0],
+                    sizeof(aiVectorKey) * nda->mNumScalingKeys);
+        }
+    }
+
+    // Allocate storage for children
+    pcOut->mNumChildren = (unsigned int)pcIn->mChildren.size();
+    pcOut->mChildren = new aiNode *[pcIn->mChildren.size()];
+
+    // Recursively process all children
+    const unsigned int size = static_cast<unsigned int>(pcIn->mChildren.size());
+    for (unsigned int i = 0; i < size; ++i) {
+        pcOut->mChildren[i] = new aiNode();
+        pcOut->mChildren[i]->mParent = pcOut;
+        AddNodeToGraph(pcSOut, pcOut->mChildren[i], pcIn->mChildren[i], abs);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Find out how many node animation channels we'll have finally
+void CountTracks(D3DS::Node *node, unsigned int &cnt) {
+    //////////////////////////////////////////////////////////////////////////////
+    // We will never generate more than one channel for a node, so
+    // this is rather easy here.
+
+    if (node->aPositionKeys.size() > 1 || node->aRotationKeys.size() > 1 ||
+            node->aScalingKeys.size() > 1 || node->aCameraRollKeys.size() > 1 ||
+            node->aTargetPositionKeys.size() > 1) {
+        ++cnt;
+
+        // account for the additional channel for the camera/spotlight target position
+        if (node->aTargetPositionKeys.size() > 1) ++cnt;
+    }
+
+    // Recursively process all children
+    for (unsigned int i = 0; i < node->mChildren.size(); ++i)
+        CountTracks(node->mChildren[i], cnt);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Generate the output node graph
+void Discreet3DSImporter::GenerateNodeGraph(aiScene *pcOut) {
+    pcOut->mRootNode = new aiNode();
+    if (0 == mRootNode->mChildren.size()) {
+        //////////////////////////////////////////////////////////////////////////////
+        // It seems the file is so messed up that it has not even a hierarchy.
+        // generate a flat hiearachy which looks like this:
+        //
+        //                ROOT_NODE
+        //                   |
+        //   ----------------------------------------
+        //   |       |       |            |         |
+        // MESH_0  MESH_1  MESH_2  ...  MESH_N    CAMERA_0 ....
+        //
+        ASSIMP_LOG_WARN("No hierarchy information has been found in the file. ");
+
+        pcOut->mRootNode->mNumChildren = pcOut->mNumMeshes +
+                                         static_cast<unsigned int>(mScene->mCameras.size() + mScene->mLights.size());
+
+        pcOut->mRootNode->mChildren = new aiNode *[pcOut->mRootNode->mNumChildren];
+        pcOut->mRootNode->mName.Set("<3DSDummyRoot>");
+
+        // Build dummy nodes for all meshes
+        unsigned int a = 0;
+        for (unsigned int i = 0; i < pcOut->mNumMeshes; ++i, ++a) {
+            aiNode *pcNode = pcOut->mRootNode->mChildren[a] = new aiNode();
+            pcNode->mParent = pcOut->mRootNode;
+            pcNode->mMeshes = new unsigned int[1];
+            pcNode->mMeshes[0] = i;
+            pcNode->mNumMeshes = 1;
+
+            // Build a name for the node
+            pcNode->mName.length = ai_snprintf(pcNode->mName.data, MAXLEN, "3DSMesh_%u", i);
+        }
+
+        // Build dummy nodes for all cameras
+        for (unsigned int i = 0; i < (unsigned int)mScene->mCameras.size(); ++i, ++a) {
+            aiNode *pcNode = pcOut->mRootNode->mChildren[a] = new aiNode();
+            pcNode->mParent = pcOut->mRootNode;
+
+            // Build a name for the node
+            pcNode->mName = mScene->mCameras[i]->mName;
+        }
+
+        // Build dummy nodes for all lights
+        for (unsigned int i = 0; i < (unsigned int)mScene->mLights.size(); ++i, ++a) {
+            aiNode *pcNode = pcOut->mRootNode->mChildren[a] = new aiNode();
+            pcNode->mParent = pcOut->mRootNode;
+
+            // Build a name for the node
+            pcNode->mName = mScene->mLights[i]->mName;
+        }
+    } else {
+        // First of all: find out how many scaling, rotation and translation
+        // animation tracks we'll have afterwards
+        unsigned int numChannel = 0;
+        CountTracks(mRootNode, numChannel);
+
+        if (numChannel) {
+            // Allocate a primary animation channel
+            pcOut->mNumAnimations = 1;
+            pcOut->mAnimations = new aiAnimation *[1];
+            aiAnimation *anim = pcOut->mAnimations[0] = new aiAnimation();
+
+            anim->mName.Set("3DSMasterAnim");
+
+            // Allocate enough storage for all node animation channels,
+            // but don't set the mNumChannels member - we'll use it to
+            // index into the array
+            anim->mChannels = new aiNodeAnim *[numChannel];
+        }
+
+        aiMatrix4x4 m;
+        AddNodeToGraph(pcOut, pcOut->mRootNode, mRootNode, m);
+    }
+
+    // We used the first and second vertex color set to store some temporary values so we need to cleanup here
+    for (unsigned int a = 0; a < pcOut->mNumMeshes; ++a) {
+        pcOut->mMeshes[a]->mColors[0] = nullptr;
+        pcOut->mMeshes[a]->mColors[1] = nullptr;
+    }
+
+    pcOut->mRootNode->mTransformation = aiMatrix4x4(
+                                                1.f, 0.f, 0.f, 0.f,
+                                                0.f, 0.f, 1.f, 0.f,
+                                                0.f, -1.f, 0.f, 0.f,
+                                                0.f, 0.f, 0.f, 1.f) *
+                                        pcOut->mRootNode->mTransformation;
+
+    // If the root node is unnamed name it "<3DSRoot>"
+    if (::strstr(pcOut->mRootNode->mName.data, "UNNAMED") ||
+            (pcOut->mRootNode->mName.data[0] == '$' && pcOut->mRootNode->mName.data[1] == '$')) {
+        pcOut->mRootNode->mName.Set("<3DSRoot>");
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Convert all meshes in the scene and generate the final output scene.
+void Discreet3DSImporter::ConvertScene(aiScene *pcOut) {
+    // Allocate enough storage for all output materials
+    pcOut->mNumMaterials = (unsigned int)mScene->mMaterials.size();
+    pcOut->mMaterials = new aiMaterial *[pcOut->mNumMaterials];
+
+    //  ... and convert the 3DS materials to aiMaterial's
+    for (unsigned int i = 0; i < pcOut->mNumMaterials; ++i) {
+        aiMaterial *pcNew = new aiMaterial();
+        ConvertMaterial(mScene->mMaterials[i], *pcNew);
+        pcOut->mMaterials[i] = pcNew;
+    }
+
+    // Generate the output mesh list
+    ConvertMeshes(pcOut);
+
+    // Now copy all light sources to the output scene
+    pcOut->mNumLights = (unsigned int)mScene->mLights.size();
+    if (pcOut->mNumLights) {
+        pcOut->mLights = new aiLight *[pcOut->mNumLights];
+        ::memcpy(pcOut->mLights, &mScene->mLights[0], sizeof(void *) * pcOut->mNumLights);
+    }
+
+    // Now copy all cameras to the output scene
+    pcOut->mNumCameras = (unsigned int)mScene->mCameras.size();
+    if (pcOut->mNumCameras) {
+        pcOut->mCameras = new aiCamera *[pcOut->mNumCameras];
+        ::memcpy(pcOut->mCameras, &mScene->mCameras[0], sizeof(void *) * pcOut->mNumCameras);
+    }
+}
+
+#endif // !! ASSIMP_BUILD_NO_3DS_IMPORTER
diff --git a/src/mesh/assimp-master/code/AssetLib/3DS/3DSExporter.cpp b/src/mesh/assimp-master/code/AssetLib/3DS/3DSExporter.cpp
new file mode 100644
index 0000000..71588f9
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/3DS/3DSExporter.cpp
@@ -0,0 +1,584 @@
+/*
+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_3DS_EXPORTER
+
+#include "AssetLib/3DS/3DSExporter.h"
+#include "AssetLib/3DS/3DSHelper.h"
+#include "AssetLib/3DS/3DSLoader.h"
+#include "PostProcessing/SplitLargeMeshes.h"
+
+#include <assimp/SceneCombiner.h>
+#include <assimp/StringComparison.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/Exporter.hpp>
+#include <assimp/IOSystem.hpp>
+
+#include <memory>
+
+namespace Assimp {
+
+using namespace D3DS;
+
+namespace {
+
+//////////////////////////////////////////////////////////////////////////////////////
+// Scope utility to write a 3DS file chunk.
+//
+// Upon construction, the chunk header is written with the chunk type (flags)
+// filled out, but the chunk size left empty. Upon destruction, the correct chunk
+// size based on the then-position of the output stream cursor is filled in.
+class ChunkWriter {
+    enum {
+        CHUNK_SIZE_NOT_SET = 0xdeadbeef,
+        SIZE_OFFSET = 2
+    };
+
+public:
+    ChunkWriter(StreamWriterLE &writer, uint16_t chunk_type) :
+            writer(writer) {
+        chunk_start_pos = writer.GetCurrentPos();
+        writer.PutU2(chunk_type);
+        writer.PutU4((uint32_t)CHUNK_SIZE_NOT_SET);
+    }
+
+    ~ChunkWriter() {
+        std::size_t head_pos = writer.GetCurrentPos();
+
+        ai_assert(head_pos > chunk_start_pos);
+        const std::size_t chunk_size = head_pos - chunk_start_pos;
+
+        writer.SetCurrentPos(chunk_start_pos + SIZE_OFFSET);
+        writer.PutU4(static_cast<uint32_t>(chunk_size));
+        writer.SetCurrentPos(head_pos);
+    }
+
+private:
+    StreamWriterLE &writer;
+    std::size_t chunk_start_pos;
+};
+
+// Return an unique name for a given |mesh| attached to |node| that
+// preserves the mesh's given name if it has one. |index| is the index
+// of the mesh in |aiScene::mMeshes|.
+std::string GetMeshName(const aiMesh &mesh, unsigned int index, const aiNode &node) {
+    static const char underscore = '_';
+    char postfix[10] = { 0 };
+    ASSIMP_itoa10(postfix, index);
+
+    std::string result = node.mName.C_Str();
+    if (mesh.mName.length > 0) {
+        result += underscore;
+        result += mesh.mName.C_Str();
+    }
+    return result + underscore + postfix;
+}
+
+// Return an unique name for a given |mat| with original position |index|
+// in |aiScene::mMaterials|. The name preserves the original material
+// name if possible.
+std::string GetMaterialName(const aiMaterial &mat, unsigned int index) {
+    static const std::string underscore = "_";
+    char postfix[10] = { 0 };
+    ASSIMP_itoa10(postfix, index);
+
+    aiString mat_name;
+    if (AI_SUCCESS == mat.Get(AI_MATKEY_NAME, mat_name)) {
+        return mat_name.C_Str() + underscore + postfix;
+    }
+
+    return "Material" + underscore + postfix;
+}
+
+// Collect world transformations for each node
+void CollectTrafos(const aiNode *node, std::map<const aiNode *, aiMatrix4x4> &trafos) {
+    const aiMatrix4x4 &parent = node->mParent ? trafos[node->mParent] : aiMatrix4x4();
+    trafos[node] = parent * node->mTransformation;
+    for (unsigned int i = 0; i < node->mNumChildren; ++i) {
+        CollectTrafos(node->mChildren[i], trafos);
+    }
+}
+
+// Generate a flat list of the meshes (by index) assigned to each node
+void CollectMeshes(const aiNode *node, std::multimap<const aiNode *, unsigned int> &meshes) {
+    for (unsigned int i = 0; i < node->mNumMeshes; ++i) {
+        meshes.insert(std::make_pair(node, node->mMeshes[i]));
+    }
+    for (unsigned int i = 0; i < node->mNumChildren; ++i) {
+        CollectMeshes(node->mChildren[i], meshes);
+    }
+}
+} // namespace
+
+// ------------------------------------------------------------------------------------------------
+// Worker function for exporting a scene to 3DS. Prototyped and registered in Exporter.cpp
+void ExportScene3DS(const char *pFile, IOSystem *pIOSystem, const aiScene *pScene, const ExportProperties * /*pProperties*/) {
+    std::shared_ptr<IOStream> outfile(pIOSystem->Open(pFile, "wb"));
+    if (!outfile) {
+        throw DeadlyExportError("Could not open output .3ds file: " + std::string(pFile));
+    }
+
+    // TODO: This extra copy should be avoided and all of this made a preprocess
+    // requirement of the 3DS exporter.
+    //
+    // 3DS meshes can be max 0xffff (16 Bit) vertices and faces, respectively.
+    // SplitLargeMeshes can do this, but it requires the correct limit to be set
+    // which is not possible with the current way of specifying preprocess steps
+    // in |Exporter::ExportFormatEntry|.
+    aiScene *scenecopy_tmp;
+    SceneCombiner::CopyScene(&scenecopy_tmp, pScene);
+    std::unique_ptr<aiScene> scenecopy(scenecopy_tmp);
+
+    SplitLargeMeshesProcess_Triangle tri_splitter;
+    tri_splitter.SetLimit(0xffff);
+    tri_splitter.Execute(scenecopy.get());
+
+    SplitLargeMeshesProcess_Vertex vert_splitter;
+    vert_splitter.SetLimit(0xffff);
+    vert_splitter.Execute(scenecopy.get());
+
+    // Invoke the actual exporter
+    Discreet3DSExporter exporter(outfile, scenecopy.get());
+}
+
+} // end of namespace Assimp
+
+// ------------------------------------------------------------------------------------------------
+Discreet3DSExporter::Discreet3DSExporter(std::shared_ptr<IOStream> &outfile, const aiScene *scene) :
+        scene(scene), writer(outfile) {
+    CollectTrafos(scene->mRootNode, trafos);
+    CollectMeshes(scene->mRootNode, meshes);
+
+    ChunkWriter curRootChunk(writer, Discreet3DS::CHUNK_MAIN);
+
+    {
+        ChunkWriter curChunk(writer, Discreet3DS::CHUNK_OBJMESH);
+        WriteMaterials();
+        WriteMeshes();
+
+        {
+            ChunkWriter curChunk1(writer, Discreet3DS::CHUNK_MASTER_SCALE);
+            writer.PutF4(1.0f);
+        }
+    }
+
+    {
+        ChunkWriter curChunk(writer, Discreet3DS::CHUNK_KEYFRAMER);
+        WriteHierarchy(*scene->mRootNode, -1, -1);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+Discreet3DSExporter::~Discreet3DSExporter() {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+int Discreet3DSExporter::WriteHierarchy(const aiNode &node, int seq, int sibling_level) {
+    // 3DS scene hierarchy is serialized as in http://www.martinreddy.net/gfx/3d/3DS.spec
+    {
+        ChunkWriter curRootChunk(writer, Discreet3DS::CHUNK_TRACKINFO);
+        {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_TRACKOBJNAME);
+
+            // Assimp node names are unique and distinct from all mesh-node
+            // names we generate; thus we can use them as-is
+            WriteString(node.mName);
+
+            // Two unknown int16 values - it is even unclear if 0 is a safe value
+            // but luckily importers do not know better either.
+            writer.PutI4(0);
+
+            int16_t hierarchy_pos = static_cast<int16_t>(seq);
+            if (sibling_level != -1) {
+                hierarchy_pos = (uint16_t)sibling_level;
+            }
+
+            // Write the hierarchy position
+            writer.PutI2(hierarchy_pos);
+        }
+    }
+
+    // TODO: write transformation chunks
+
+    ++seq;
+    sibling_level = seq;
+
+    // Write all children
+    for (unsigned int i = 0; i < node.mNumChildren; ++i) {
+        seq = WriteHierarchy(*node.mChildren[i], seq, i == 0 ? -1 : sibling_level);
+    }
+
+    // Write all meshes as separate nodes to be able to reference the meshes by name
+    for (unsigned int i = 0; i < node.mNumMeshes; ++i) {
+        const bool first_child = node.mNumChildren == 0 && i == 0;
+
+        const unsigned int mesh_idx = node.mMeshes[i];
+        const aiMesh &mesh = *scene->mMeshes[mesh_idx];
+
+        ChunkWriter curChunk(writer, Discreet3DS::CHUNK_TRACKINFO);
+        {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_TRACKOBJNAME);
+            WriteString(GetMeshName(mesh, mesh_idx, node));
+
+            writer.PutI4(0);
+            writer.PutI2(static_cast<int16_t>(first_child ? seq : sibling_level));
+            ++seq;
+        }
+    }
+    return seq;
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WriteMaterials() {
+    for (unsigned int i = 0; i < scene->mNumMaterials; ++i) {
+        ChunkWriter curRootChunk(writer, Discreet3DS::CHUNK_MAT_MATERIAL);
+        const aiMaterial &mat = *scene->mMaterials[i];
+
+        {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_MAT_MATNAME);
+            const std::string &name = GetMaterialName(mat, i);
+            WriteString(name);
+        }
+
+        aiColor3D color;
+        if (mat.Get(AI_MATKEY_COLOR_DIFFUSE, color) == AI_SUCCESS) {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAT_DIFFUSE);
+            WriteColor(color);
+        }
+
+        if (mat.Get(AI_MATKEY_COLOR_SPECULAR, color) == AI_SUCCESS) {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAT_SPECULAR);
+            WriteColor(color);
+        }
+
+        if (mat.Get(AI_MATKEY_COLOR_AMBIENT, color) == AI_SUCCESS) {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAT_AMBIENT);
+            WriteColor(color);
+        }
+
+        float f;
+        if (mat.Get(AI_MATKEY_OPACITY, f) == AI_SUCCESS) {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_MAT_TRANSPARENCY);
+            WritePercentChunk(1.0f - f);
+        }
+
+        if (mat.Get(AI_MATKEY_COLOR_EMISSIVE, color) == AI_SUCCESS) {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAT_SELF_ILLUM);
+            WriteColor(color);
+        }
+
+        aiShadingMode shading_mode = aiShadingMode_Flat;
+        if (mat.Get(AI_MATKEY_SHADING_MODEL, shading_mode) == AI_SUCCESS) {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_MAT_SHADING);
+
+            Discreet3DS::shadetype3ds shading_mode_out;
+            switch (shading_mode) {
+            case aiShadingMode_Flat:
+            case aiShadingMode_NoShading:
+                shading_mode_out = Discreet3DS::Flat;
+                break;
+
+            case aiShadingMode_Gouraud:
+            case aiShadingMode_Toon:
+            case aiShadingMode_OrenNayar:
+            case aiShadingMode_Minnaert:
+                shading_mode_out = Discreet3DS::Gouraud;
+                break;
+
+            case aiShadingMode_Phong:
+            case aiShadingMode_Blinn:
+            case aiShadingMode_CookTorrance:
+            case aiShadingMode_Fresnel:
+            case aiShadingMode_PBR_BRDF: // Possibly should be Discreet3DS::Metal in some cases but this is undocumented
+                shading_mode_out = Discreet3DS::Phong;
+                break;
+
+            default:
+                shading_mode_out = Discreet3DS::Flat;
+                ai_assert(false);
+            };
+            writer.PutU2(static_cast<uint16_t>(shading_mode_out));
+        }
+
+        if (mat.Get(AI_MATKEY_SHININESS, f) == AI_SUCCESS) {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_MAT_SHININESS);
+            WritePercentChunk(f);
+        }
+
+        if (mat.Get(AI_MATKEY_SHININESS_STRENGTH, f) == AI_SUCCESS) {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_MAT_SHININESS_PERCENT);
+            WritePercentChunk(f);
+        }
+
+        int twosided;
+        if (mat.Get(AI_MATKEY_TWOSIDED, twosided) == AI_SUCCESS && twosided != 0) {
+            ChunkWriter chunk(writer, Discreet3DS::CHUNK_MAT_TWO_SIDE);
+            writer.PutI2(1);
+        }
+
+        // Fallback to BASE_COLOR if no DIFFUSE
+        if (!WriteTexture(mat, aiTextureType_DIFFUSE, Discreet3DS::CHUNK_MAT_TEXTURE))
+            WriteTexture(mat, aiTextureType_BASE_COLOR, Discreet3DS::CHUNK_MAT_TEXTURE);
+
+        WriteTexture(mat, aiTextureType_HEIGHT, Discreet3DS::CHUNK_MAT_BUMPMAP);
+        WriteTexture(mat, aiTextureType_OPACITY, Discreet3DS::CHUNK_MAT_OPACMAP);
+        WriteTexture(mat, aiTextureType_SHININESS, Discreet3DS::CHUNK_MAT_MAT_SHINMAP);
+        WriteTexture(mat, aiTextureType_SPECULAR, Discreet3DS::CHUNK_MAT_SPECMAP);
+        WriteTexture(mat, aiTextureType_EMISSIVE, Discreet3DS::CHUNK_MAT_SELFIMAP);
+        WriteTexture(mat, aiTextureType_REFLECTION, Discreet3DS::CHUNK_MAT_REFLMAP);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// returns true if the texture existed
+bool Discreet3DSExporter::WriteTexture(const aiMaterial &mat, aiTextureType type, uint16_t chunk_flags) {
+    aiString path;
+    aiTextureMapMode map_mode[2] = {
+        aiTextureMapMode_Wrap, aiTextureMapMode_Wrap
+    };
+    ai_real blend = 1.0;
+    if (mat.GetTexture(type, 0, &path, nullptr, nullptr, &blend, nullptr, map_mode) != AI_SUCCESS || !path.length) {
+        return false;
+    }
+
+    // TODO: handle embedded textures properly
+    if (path.data[0] == '*') {
+        ASSIMP_LOG_ERROR("Ignoring embedded texture for export: ", path.C_Str());
+        return false;
+    }
+
+    ChunkWriter chunk(writer, chunk_flags);
+    {
+        ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAPFILE);
+        WriteString(path);
+    }
+
+    WritePercentChunk(blend);
+
+    {
+        ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAT_MAP_TILING);
+        uint16_t val = 0; // WRAP
+        if (map_mode[0] == aiTextureMapMode_Mirror) {
+            val = 0x2;
+        } else if (map_mode[0] == aiTextureMapMode_Decal) {
+            val = 0x10;
+        }
+        writer.PutU2(val);
+    }
+    // TODO: export texture transformation (i.e. UV offset, scale, rotation)
+    return true;
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WriteMeshes() {
+    // NOTE: 3DS allows for instances. However:
+    //   i)  not all importers support reading them
+    //   ii) instances are not as flexible as they are in assimp, in particular,
+    //        nodes can carry (and instance) only one mesh.
+    //
+    // This exporter currently deep clones all instanced meshes, i.e. for each mesh
+    // attached to a node a full TRIMESH chunk is written to the file.
+    //
+    // Furthermore, the TRIMESH is transformed into world space so that it will
+    // appear correctly if importers don't read the scene hierarchy at all.
+    for (MeshesByNodeMap::const_iterator it = meshes.begin(); it != meshes.end(); ++it) {
+        const aiNode &node = *(*it).first;
+        const unsigned int mesh_idx = (*it).second;
+
+        const aiMesh &mesh = *scene->mMeshes[mesh_idx];
+
+        // This should not happen if the SLM step is correctly executed
+        // before the scene is handed to the exporter
+        ai_assert(mesh.mNumVertices <= 0xffff);
+        ai_assert(mesh.mNumFaces <= 0xffff);
+
+        const aiMatrix4x4 &trafo = trafos[&node];
+
+        ChunkWriter chunk(writer, Discreet3DS::CHUNK_OBJBLOCK);
+
+        // Mesh name is tied to the node it is attached to so it can later be referenced
+        const std::string &name = GetMeshName(mesh, mesh_idx, node);
+        WriteString(name);
+
+        // TRIMESH chunk
+        ChunkWriter chunk2(writer, Discreet3DS::CHUNK_TRIMESH);
+
+        // Vertices in world space
+        {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_VERTLIST);
+
+            const uint16_t count = static_cast<uint16_t>(mesh.mNumVertices);
+            writer.PutU2(count);
+            for (unsigned int i = 0; i < mesh.mNumVertices; ++i) {
+                const aiVector3D &v = mesh.mVertices[i];
+                writer.PutF4(v.x);
+                writer.PutF4(v.y);
+                writer.PutF4(v.z);
+            }
+        }
+
+        // UV coordinates
+        if (mesh.HasTextureCoords(0)) {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_MAPLIST);
+            const uint16_t count = static_cast<uint16_t>(mesh.mNumVertices);
+            writer.PutU2(count);
+
+            for (unsigned int i = 0; i < mesh.mNumVertices; ++i) {
+                const aiVector3D &v = mesh.mTextureCoords[0][i];
+                writer.PutF4(v.x);
+                writer.PutF4(v.y);
+            }
+        }
+
+        // Faces (indices)
+        {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_FACELIST);
+
+            ai_assert(mesh.mNumFaces <= 0xffff);
+
+            // Count triangles, discard lines and points
+            uint16_t count = 0;
+            for (unsigned int i = 0; i < mesh.mNumFaces; ++i) {
+                const aiFace &f = mesh.mFaces[i];
+                if (f.mNumIndices < 3) {
+                    continue;
+                }
+                // TRIANGULATE step is a pre-requisite so we should not see polys here
+                ai_assert(f.mNumIndices == 3);
+                ++count;
+            }
+
+            writer.PutU2(count);
+            for (unsigned int i = 0; i < mesh.mNumFaces; ++i) {
+                const aiFace &f = mesh.mFaces[i];
+                if (f.mNumIndices < 3) {
+                    continue;
+                }
+
+                for (unsigned int j = 0; j < 3; ++j) {
+                    ai_assert(f.mIndices[j] <= 0xffff);
+                    writer.PutI2(static_cast<uint16_t>(f.mIndices[j]));
+                }
+
+                // Edge visibility flag
+                writer.PutI2(0x0);
+            }
+
+            // TODO: write smoothing groups (CHUNK_SMOOLIST)
+
+            WriteFaceMaterialChunk(mesh);
+        }
+
+        // Transformation matrix by which the mesh vertices have been pre-transformed with.
+        {
+            ChunkWriter curChunk(writer, Discreet3DS::CHUNK_TRMATRIX);
+            // Store rotation 3x3 matrix row wise
+            for (unsigned int r = 0; r < 3; ++r) {
+                for (unsigned int c = 0; c < 3; ++c) {
+                    writer.PutF4(trafo[r][c]);
+                }
+            }
+            // Store translation sub vector column wise
+            for (unsigned int r = 0; r < 3; ++r) {
+                writer.PutF4(trafo[r][3]);
+            }
+        }
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WriteFaceMaterialChunk(const aiMesh &mesh) {
+    ChunkWriter curChunk(writer, Discreet3DS::CHUNK_FACEMAT);
+    const std::string &name = GetMaterialName(*scene->mMaterials[mesh.mMaterialIndex], mesh.mMaterialIndex);
+    WriteString(name);
+
+    // Because assimp splits meshes by material, only a single
+    // FACEMAT chunk needs to be written
+    ai_assert(mesh.mNumFaces <= 0xffff);
+    const uint16_t count = static_cast<uint16_t>(mesh.mNumFaces);
+    writer.PutU2(count);
+
+    for (unsigned int i = 0; i < mesh.mNumFaces; ++i) {
+        writer.PutU2(static_cast<uint16_t>(i));
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WriteString(const std::string &s) {
+    for (std::string::const_iterator it = s.begin(); it != s.end(); ++it) {
+        writer.PutI1(*it);
+    }
+    writer.PutI1('\0');
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WriteString(const aiString &s) {
+    for (std::size_t i = 0; i < s.length; ++i) {
+        writer.PutI1(s.data[i]);
+    }
+    writer.PutI1('\0');
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WriteColor(const aiColor3D &color) {
+    ChunkWriter curChunk(writer, Discreet3DS::CHUNK_RGBF);
+    writer.PutF4(color.r);
+    writer.PutF4(color.g);
+    writer.PutF4(color.b);
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WritePercentChunk(float f) {
+    ChunkWriter curChunk(writer, Discreet3DS::CHUNK_PERCENTF);
+    writer.PutF4(f);
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSExporter::WritePercentChunk(double f) {
+    ChunkWriter ccurChunkhunk(writer, Discreet3DS::CHUNK_PERCENTD);
+    writer.PutF8(f);
+}
+
+#endif // ASSIMP_BUILD_NO_3DS_EXPORTER
+#endif // ASSIMP_BUILD_NO_EXPORT
diff --git a/src/mesh/assimp-master/code/AssetLib/3DS/3DSExporter.h b/src/mesh/assimp-master/code/AssetLib/3DS/3DSExporter.h
new file mode 100644
index 0000000..82ec351
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/3DS/3DSExporter.h
@@ -0,0 +1,98 @@
+/*
+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 3DSExporter.h
+ * 3DS Exporter Main Header
+ */
+#ifndef AI_3DSEXPORTER_H_INC
+#define AI_3DSEXPORTER_H_INC
+
+#include <map>
+#include <memory>
+
+#include <assimp/StreamWriter.h>
+#include <assimp/material.h>
+
+struct aiScene;
+struct aiNode;
+struct aiMaterial;
+struct aiMesh;
+
+namespace Assimp
+{
+
+// ------------------------------------------------------------------------------------------------
+/**
+ *  @brief  Helper class to export a given scene to a 3DS file.
+ */
+// ------------------------------------------------------------------------------------------------
+class Discreet3DSExporter {
+public:
+    Discreet3DSExporter(std::shared_ptr<IOStream> &outfile, const aiScene* pScene);
+    ~Discreet3DSExporter();
+
+private:
+    void WriteMeshes();
+    void WriteMaterials();
+    bool WriteTexture(const aiMaterial& mat, aiTextureType type, uint16_t chunk_flags);
+    void WriteFaceMaterialChunk(const aiMesh& mesh);
+    int WriteHierarchy(const aiNode& node, int level, int sibling_level);
+    void WriteString(const std::string& s);
+    void WriteString(const aiString& s);
+    void WriteColor(const aiColor3D& color);
+    void WritePercentChunk(float f);
+    void WritePercentChunk(double f);
+
+private:
+    const aiScene* const scene;
+    StreamWriterLE writer;
+
+    std::map<const aiNode*, aiMatrix4x4> trafos;
+
+    typedef std::multimap<const aiNode*, unsigned int> MeshesByNodeMap;
+    MeshesByNodeMap meshes;
+
+};
+
+} // Namespace Assimp
+
+#endif // AI_3DSEXPORTER_H_INC
diff --git a/src/mesh/assimp-master/code/AssetLib/3DS/3DSHelper.h b/src/mesh/assimp-master/code/AssetLib/3DS/3DSHelper.h
new file mode 100644
index 0000000..dc10980
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/3DS/3DSHelper.h
@@ -0,0 +1,702 @@
+/*
+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 Defines helper data structures for the import of 3DS files */
+
+#ifndef AI_3DSFILEHELPER_H_INC
+#define AI_3DSFILEHELPER_H_INC
+
+#include <assimp/SmoothingGroups.h>
+#include <assimp/SpatialSort.h>
+#include <assimp/StringUtils.h>
+#include <assimp/anim.h>
+#include <assimp/camera.h>
+#include <assimp/light.h>
+#include <assimp/material.h>
+#include <assimp/qnan.h>
+#include <cstdio> //sprintf
+
+namespace Assimp {
+namespace D3DS {
+
+#include <assimp/Compiler/pushpack1.h>
+
+// ---------------------------------------------------------------------------
+/** Defines chunks and data structures.
+*/
+namespace Discreet3DS {
+
+    //! data structure for a single chunk in a .3ds file
+    struct Chunk {
+        uint16_t Flag;
+        uint32_t Size;
+    } PACK_STRUCT;
+
+    //! Used for shading field in material3ds structure
+    //! From AutoDesk 3ds SDK
+    typedef enum {
+        // translated to gouraud shading with wireframe active
+        Wire = 0x0,
+
+        // if this material is set, no vertex normals will
+        // be calculated for the model. Face normals + gouraud
+        Flat = 0x1,
+
+        // standard gouraud shading
+        Gouraud = 0x2,
+
+        // phong shading
+        Phong = 0x3,
+
+        // cooktorrance or anistropic phong shading ...
+        // the exact meaning is unknown, if you know it
+        // feel free to tell me ;-)
+        Metal = 0x4,
+
+        // required by the ASE loader
+        Blinn = 0x5
+    } shadetype3ds;
+
+    // Flags for animated keys
+    enum {
+        KEY_USE_TENS = 0x1,
+        KEY_USE_CONT = 0x2,
+        KEY_USE_BIAS = 0x4,
+        KEY_USE_EASE_TO = 0x8,
+        KEY_USE_EASE_FROM = 0x10
+    };
+
+    enum {
+
+        // ********************************************************************
+        // Basic chunks which can be found everywhere in the file
+        CHUNK_VERSION = 0x0002,
+        CHUNK_RGBF = 0x0010, // float4 R; float4 G; float4 B
+        CHUNK_RGBB = 0x0011, // int1 R; int1 G; int B
+
+        // Linear color values (gamma = 2.2?)
+        CHUNK_LINRGBF = 0x0013, // float4 R; float4 G; float4 B
+        CHUNK_LINRGBB = 0x0012, // int1 R; int1 G; int B
+
+        CHUNK_PERCENTW = 0x0030, // int2   percentage
+        CHUNK_PERCENTF = 0x0031, // float4  percentage
+        CHUNK_PERCENTD = 0x0032, // float8  percentage
+        // ********************************************************************
+
+        // Prj master chunk
+        CHUNK_PRJ = 0xC23D,
+
+        // MDLI master chunk
+        CHUNK_MLI = 0x3DAA,
+
+        // Primary main chunk of the .3ds file
+        CHUNK_MAIN = 0x4D4D,
+
+        // Mesh main chunk
+        CHUNK_OBJMESH = 0x3D3D,
+
+        // Specifies the background color of the .3ds file
+        // This is passed through the material system for
+        // viewing purposes.
+        CHUNK_BKGCOLOR = 0x1200,
+
+        // Specifies the ambient base color of the scene.
+        // This is added to all materials in the file
+        CHUNK_AMBCOLOR = 0x2100,
+
+        // Specifies the background image for the whole scene
+        // This value is passed through the material system
+        // to the viewer
+        CHUNK_BIT_MAP = 0x1100,
+        CHUNK_BIT_MAP_EXISTS = 0x1101,
+
+        // ********************************************************************
+        // Viewport related stuff. Ignored
+        CHUNK_DEFAULT_VIEW = 0x3000,
+        CHUNK_VIEW_TOP = 0x3010,
+        CHUNK_VIEW_BOTTOM = 0x3020,
+        CHUNK_VIEW_LEFT = 0x3030,
+        CHUNK_VIEW_RIGHT = 0x3040,
+        CHUNK_VIEW_FRONT = 0x3050,
+        CHUNK_VIEW_BACK = 0x3060,
+        CHUNK_VIEW_USER = 0x3070,
+        CHUNK_VIEW_CAMERA = 0x3080,
+        // ********************************************************************
+
+        // Mesh chunks
+        CHUNK_OBJBLOCK = 0x4000,
+        CHUNK_TRIMESH = 0x4100,
+        CHUNK_VERTLIST = 0x4110,
+        CHUNK_VERTFLAGS = 0x4111,
+        CHUNK_FACELIST = 0x4120,
+        CHUNK_FACEMAT = 0x4130,
+        CHUNK_MAPLIST = 0x4140,
+        CHUNK_SMOOLIST = 0x4150,
+        CHUNK_TRMATRIX = 0x4160,
+        CHUNK_MESHCOLOR = 0x4165,
+        CHUNK_TXTINFO = 0x4170,
+        CHUNK_LIGHT = 0x4600,
+        CHUNK_CAMERA = 0x4700,
+        CHUNK_HIERARCHY = 0x4F00,
+
+        // Specifies the global scaling factor. This is applied
+        // to the root node's transformation matrix
+        CHUNK_MASTER_SCALE = 0x0100,
+
+        // ********************************************************************
+        // Material chunks
+        CHUNK_MAT_MATERIAL = 0xAFFF,
+
+        // asciiz containing the name of the material
+        CHUNK_MAT_MATNAME = 0xA000,
+        CHUNK_MAT_AMBIENT = 0xA010, // followed by color chunk
+        CHUNK_MAT_DIFFUSE = 0xA020, // followed by color chunk
+        CHUNK_MAT_SPECULAR = 0xA030, // followed by color chunk
+
+        // Specifies the shininess of the material
+        // followed by percentage chunk
+        CHUNK_MAT_SHININESS = 0xA040,
+        CHUNK_MAT_SHININESS_PERCENT = 0xA041,
+
+        // Specifies the shading mode to be used
+        // followed by a short
+        CHUNK_MAT_SHADING = 0xA100,
+
+        // NOTE: Emissive color (self illumination) seems not
+        // to be a color but a single value, type is unknown.
+        // Make the parser accept both of them.
+        // followed by percentage chunk (?)
+        CHUNK_MAT_SELF_ILLUM = 0xA080,
+
+        // Always followed by percentage chunk  (?)
+        CHUNK_MAT_SELF_ILPCT = 0xA084,
+
+        // Always followed by percentage chunk
+        CHUNK_MAT_TRANSPARENCY = 0xA050,
+
+        // Diffuse texture channel 0
+        CHUNK_MAT_TEXTURE = 0xA200,
+
+        // Contains opacity information for each texel
+        CHUNK_MAT_OPACMAP = 0xA210,
+
+        // Contains a reflection map to be used to reflect
+        // the environment. This is partially supported.
+        CHUNK_MAT_REFLMAP = 0xA220,
+
+        // Self Illumination map (emissive colors)
+        CHUNK_MAT_SELFIMAP = 0xA33d,
+
+        // Bumpmap. Not specified whether it is a heightmap
+        // or a normal map. Assme it is a heightmap since
+        // artist normally prefer this format.
+        CHUNK_MAT_BUMPMAP = 0xA230,
+
+        // Specular map. Seems to influence the specular color
+        CHUNK_MAT_SPECMAP = 0xA204,
+
+        // Holds shininess data.
+        CHUNK_MAT_MAT_SHINMAP = 0xA33C,
+
+        // Scaling in U/V direction.
+        // (need to gen separate UV coordinate set
+        // and do this by hand)
+        CHUNK_MAT_MAP_USCALE = 0xA354,
+        CHUNK_MAT_MAP_VSCALE = 0xA356,
+
+        // Translation in U/V direction.
+        // (need to gen separate UV coordinate set
+        // and do this by hand)
+        CHUNK_MAT_MAP_UOFFSET = 0xA358,
+        CHUNK_MAT_MAP_VOFFSET = 0xA35a,
+
+        // UV-coordinates rotation around the z-axis
+        // Assumed to be in radians.
+        CHUNK_MAT_MAP_ANG = 0xA35C,
+
+        // Tiling flags for 3DS files
+        CHUNK_MAT_MAP_TILING = 0xa351,
+
+        // Specifies the file name of a texture
+        CHUNK_MAPFILE = 0xA300,
+
+        // Specifies whether a material requires two-sided rendering
+        CHUNK_MAT_TWO_SIDE = 0xA081,
+        // ********************************************************************
+
+        // Main keyframer chunk. Contains translation/rotation/scaling data
+        CHUNK_KEYFRAMER = 0xB000,
+
+        // Supported sub chunks
+        CHUNK_TRACKINFO = 0xB002,
+        CHUNK_TRACKOBJNAME = 0xB010,
+        CHUNK_TRACKDUMMYOBJNAME = 0xB011,
+        CHUNK_TRACKPIVOT = 0xB013,
+        CHUNK_TRACKPOS = 0xB020,
+        CHUNK_TRACKROTATE = 0xB021,
+        CHUNK_TRACKSCALE = 0xB022,
+
+        // ********************************************************************
+        // Keyframes for various other stuff in the file
+        // Partially ignored
+        CHUNK_AMBIENTKEY = 0xB001,
+        CHUNK_TRACKMORPH = 0xB026,
+        CHUNK_TRACKHIDE = 0xB029,
+        CHUNK_OBJNUMBER = 0xB030,
+        CHUNK_TRACKCAMERA = 0xB003,
+        CHUNK_TRACKFOV = 0xB023,
+        CHUNK_TRACKROLL = 0xB024,
+        CHUNK_TRACKCAMTGT = 0xB004,
+        CHUNK_TRACKLIGHT = 0xB005,
+        CHUNK_TRACKLIGTGT = 0xB006,
+        CHUNK_TRACKSPOTL = 0xB007,
+        CHUNK_FRAMES = 0xB008,
+        // ********************************************************************
+
+        // light sub-chunks
+        CHUNK_DL_OFF = 0x4620,
+        CHUNK_DL_OUTER_RANGE = 0x465A,
+        CHUNK_DL_INNER_RANGE = 0x4659,
+        CHUNK_DL_MULTIPLIER = 0x465B,
+        CHUNK_DL_EXCLUDE = 0x4654,
+        CHUNK_DL_ATTENUATE = 0x4625,
+        CHUNK_DL_SPOTLIGHT = 0x4610,
+
+        // camera sub-chunks
+        CHUNK_CAM_RANGES = 0x4720
+    };
+}
+
+// ---------------------------------------------------------------------------
+/** Helper structure representing a 3ds mesh face */
+struct Face : public FaceWithSmoothingGroup {
+};
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4315)
+#endif // _MSC_VER
+
+// ---------------------------------------------------------------------------
+/** Helper structure representing a texture */
+struct Texture {
+    //! Default constructor
+    Texture() AI_NO_EXCEPT
+            : mTextureBlend(0.0f),
+              mMapName(),
+              mOffsetU(0.0),
+              mOffsetV(0.0),
+              mScaleU(1.0),
+              mScaleV(1.0),
+              mRotation(0.0),
+              mMapMode(aiTextureMapMode_Wrap),
+              bPrivate(),
+              iUVSrc(0) {
+        mTextureBlend = get_qnan();
+    }
+
+    Texture(const Texture &other) :
+            mTextureBlend(other.mTextureBlend),
+            mMapName(other.mMapName),
+            mOffsetU(other.mOffsetU),
+            mOffsetV(other.mOffsetV),
+            mScaleU(other.mScaleU),
+            mScaleV(other.mScaleV),
+            mRotation(other.mRotation),
+            mMapMode(other.mMapMode),
+            bPrivate(other.bPrivate),
+            iUVSrc(other.iUVSrc) {
+        // empty
+    }
+
+    Texture(Texture &&other) AI_NO_EXCEPT : mTextureBlend(other.mTextureBlend),
+                                            mMapName(std::move(other.mMapName)),
+                                            mOffsetU(other.mOffsetU),
+                                            mOffsetV(other.mOffsetV),
+                                            mScaleU(other.mScaleU),
+                                            mScaleV(other.mScaleV),
+                                            mRotation(other.mRotation),
+                                            mMapMode(other.mMapMode),
+                                            bPrivate(other.bPrivate),
+                                            iUVSrc(other.iUVSrc) {
+        // empty
+    }
+
+    Texture &operator=(Texture &&other) AI_NO_EXCEPT {
+        if (this == &other) {
+            return *this;
+        }
+
+        mTextureBlend = other.mTextureBlend;
+        mMapName = std::move(other.mMapName);
+        mOffsetU = other.mOffsetU;
+        mOffsetV = other.mOffsetV;
+        mScaleU = other.mScaleU;
+        mScaleV = other.mScaleV;
+        mRotation = other.mRotation;
+        mMapMode = other.mMapMode;
+        bPrivate = other.bPrivate;
+        iUVSrc = other.iUVSrc;
+
+        return *this;
+    }
+
+    //! Specifies the blend factor for the texture
+    ai_real mTextureBlend;
+
+    //! Specifies the filename of the texture
+    std::string mMapName;
+
+    //! Specifies texture coordinate offsets/scaling/rotations
+    ai_real mOffsetU;
+    ai_real mOffsetV;
+    ai_real mScaleU;
+    ai_real mScaleV;
+    ai_real mRotation;
+
+    //! Specifies the mapping mode to be used for the texture
+    aiTextureMapMode mMapMode;
+
+    //! Used internally
+    bool bPrivate;
+    int iUVSrc;
+};
+
+#include <assimp/Compiler/poppack1.h>
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
+
+// ---------------------------------------------------------------------------
+/** Helper structure representing a 3ds material */
+struct Material {
+    //! Default constructor has been deleted
+    Material() :
+            mName(),
+            mDiffuse(ai_real(0.6), ai_real(0.6), ai_real(0.6)),
+            mSpecularExponent(ai_real(0.0)),
+            mShininessStrength(ai_real(1.0)),
+            mShading(Discreet3DS::Gouraud),
+            mTransparency(ai_real(1.0)),
+            mBumpHeight(ai_real(1.0)),
+            mTwoSided(false) {
+        // empty
+    }
+
+    //! Constructor with explicit name
+    explicit Material(const std::string &name) :
+            mName(name),
+            mDiffuse(ai_real(0.6), ai_real(0.6), ai_real(0.6)),
+            mSpecularExponent(ai_real(0.0)),
+            mShininessStrength(ai_real(1.0)),
+            mShading(Discreet3DS::Gouraud),
+            mTransparency(ai_real(1.0)),
+            mBumpHeight(ai_real(1.0)),
+            mTwoSided(false) {
+        // empty
+    }
+
+    Material(const Material &other) :
+            mName(other.mName),
+            mDiffuse(other.mDiffuse),
+            mSpecularExponent(other.mSpecularExponent),
+            mShininessStrength(other.mShininessStrength),
+            mSpecular(other.mSpecular),
+            mAmbient(other.mAmbient),
+            mShading(other.mShading),
+            mTransparency(other.mTransparency),
+            sTexDiffuse(other.sTexDiffuse),
+            sTexOpacity(other.sTexOpacity),
+            sTexSpecular(other.sTexSpecular),
+            sTexReflective(other.sTexReflective),
+            sTexBump(other.sTexBump),
+            sTexEmissive(other.sTexEmissive),
+            sTexShininess(other.sTexShininess),
+            mBumpHeight(other.mBumpHeight),
+            mEmissive(other.mEmissive),
+            sTexAmbient(other.sTexAmbient),
+            mTwoSided(other.mTwoSided) {
+        // empty
+    }
+
+    //! Move constructor. This is explicitly written because MSVC doesn't support defaulting it
+    Material(Material &&other) AI_NO_EXCEPT : mName(std::move(other.mName)),
+                                              mDiffuse(other.mDiffuse),
+                                              mSpecularExponent(other.mSpecularExponent),
+                                              mShininessStrength(other.mShininessStrength),
+                                              mSpecular(other.mSpecular),
+                                              mAmbient(other.mAmbient),
+                                              mShading(other.mShading),
+                                              mTransparency(other.mTransparency),
+                                              sTexDiffuse(std::move(other.sTexDiffuse)),
+                                              sTexOpacity(std::move(other.sTexOpacity)),
+                                              sTexSpecular(std::move(other.sTexSpecular)),
+                                              sTexReflective(std::move(other.sTexReflective)),
+                                              sTexBump(std::move(other.sTexBump)),
+                                              sTexEmissive(std::move(other.sTexEmissive)),
+                                              sTexShininess(std::move(other.sTexShininess)),
+                                              mBumpHeight(other.mBumpHeight),
+                                              mEmissive(other.mEmissive),
+                                              sTexAmbient(std::move(other.sTexAmbient)),
+                                              mTwoSided(other.mTwoSided) {
+        // empty
+    }
+
+    Material &operator=(Material &&other) AI_NO_EXCEPT {
+        if (this == &other) {
+            return *this;
+        }
+
+        mName = std::move(other.mName);
+        mDiffuse = other.mDiffuse;
+        mSpecularExponent = other.mSpecularExponent;
+        mShininessStrength = other.mShininessStrength,
+        mSpecular = other.mSpecular;
+        mAmbient = other.mAmbient;
+        mShading = other.mShading;
+        mTransparency = other.mTransparency;
+        sTexDiffuse = std::move(other.sTexDiffuse);
+        sTexOpacity = std::move(other.sTexOpacity);
+        sTexSpecular = std::move(other.sTexSpecular);
+        sTexReflective = std::move(other.sTexReflective);
+        sTexBump = std::move(other.sTexBump);
+        sTexEmissive = std::move(other.sTexEmissive);
+        sTexShininess = std::move(other.sTexShininess);
+        mBumpHeight = other.mBumpHeight;
+        mEmissive = other.mEmissive;
+        sTexAmbient = std::move(other.sTexAmbient);
+        mTwoSided = other.mTwoSided;
+
+        return *this;
+    }
+
+    virtual ~Material() {
+        // empty
+    }
+
+    //! Name of the material
+    std::string mName;
+    //! Diffuse color of the material
+    aiColor3D mDiffuse;
+    //! Specular exponent
+    ai_real mSpecularExponent;
+    //! Shininess strength, in percent
+    ai_real mShininessStrength;
+    //! Specular color of the material
+    aiColor3D mSpecular;
+    //! Ambient color of the material
+    aiColor3D mAmbient;
+    //! Shading type to be used
+    Discreet3DS::shadetype3ds mShading;
+    //! Opacity of the material
+    ai_real mTransparency;
+    //! Diffuse texture channel
+    Texture sTexDiffuse;
+    //! Opacity texture channel
+    Texture sTexOpacity;
+    //! Specular texture channel
+    Texture sTexSpecular;
+    //! Reflective texture channel
+    Texture sTexReflective;
+    //! Bump texture channel
+    Texture sTexBump;
+    //! Emissive texture channel
+    Texture sTexEmissive;
+    //! Shininess texture channel
+    Texture sTexShininess;
+    //! Scaling factor for the bump values
+    ai_real mBumpHeight;
+    //! Emissive color
+    aiColor3D mEmissive;
+    //! Ambient texture channel
+    //! (used by the ASE format)
+    Texture sTexAmbient;
+    //! True if the material must be rendered from two sides
+    bool mTwoSided;
+};
+
+// ---------------------------------------------------------------------------
+/** Helper structure to represent a 3ds file mesh */
+struct Mesh : public MeshWithSmoothingGroups<D3DS::Face> {
+    //! Default constructor has been deleted
+    Mesh() = delete;
+
+    //! Constructor with explicit name
+    explicit Mesh(const std::string &name) :
+            mName(name) {
+    }
+
+    //! Name of the mesh
+    std::string mName;
+
+    //! Texture coordinates
+    std::vector<aiVector3D> mTexCoords;
+
+    //! Face materials
+    std::vector<unsigned int> mFaceMaterials;
+
+    //! Local transformation matrix
+    aiMatrix4x4 mMat;
+};
+
+// ---------------------------------------------------------------------------
+/** Float key - quite similar to aiVectorKey and aiQuatKey. Both are in the
+    C-API, so it would be difficult to make them a template. */
+struct aiFloatKey {
+    double mTime; ///< The time of this key
+    ai_real mValue; ///< The value of this key
+
+#ifdef __cplusplus
+
+    // time is not compared
+    bool operator==(const aiFloatKey &o) const { return o.mValue == this->mValue; }
+
+    bool operator!=(const aiFloatKey &o) const { return o.mValue != this->mValue; }
+
+    // Only time is compared. This operator is defined
+    // for use with std::sort
+    bool operator<(const aiFloatKey &o) const { return mTime < o.mTime; }
+
+    bool operator>(const aiFloatKey &o) const { return mTime > o.mTime; }
+
+#endif
+};
+
+// ---------------------------------------------------------------------------
+/** Helper structure to represent a 3ds file node */
+struct Node {
+    Node() = delete;
+
+    explicit Node(const std::string &name) :
+            mParent(nullptr),
+            mName(name),
+            mInstanceNumber(0),
+            mHierarchyPos(0),
+            mHierarchyIndex(0),
+            mInstanceCount(1) {
+        aRotationKeys.reserve(20);
+        aPositionKeys.reserve(20);
+        aScalingKeys.reserve(20);
+    }
+
+    ~Node() {
+        for (unsigned int i = 0; i < mChildren.size(); ++i)
+            delete mChildren[i];
+    }
+
+    //! Pointer to the parent node
+    Node *mParent;
+
+    //! Holds all child nodes
+    std::vector<Node *> mChildren;
+
+    //! Name of the node
+    std::string mName;
+
+    //! InstanceNumber of the node
+    int32_t mInstanceNumber;
+
+    //! Dummy nodes: real name to be combined with the $$$DUMMY
+    std::string mDummyName;
+
+    //! Position of the node in the hierarchy (tree depth)
+    int16_t mHierarchyPos;
+
+    //! Index of the node
+    int16_t mHierarchyIndex;
+
+    //! Rotation keys loaded from the file
+    std::vector<aiQuatKey> aRotationKeys;
+
+    //! Position keys loaded from the file
+    std::vector<aiVectorKey> aPositionKeys;
+
+    //! Scaling keys loaded from the file
+    std::vector<aiVectorKey> aScalingKeys;
+
+    // For target lights (spot lights and directional lights):
+    // The position of the target
+    std::vector<aiVectorKey> aTargetPositionKeys;
+
+    // For cameras: the camera roll angle
+    std::vector<aiFloatKey> aCameraRollKeys;
+
+    //! Pivot position loaded from the file
+    aiVector3D vPivot;
+
+    //instance count, will be kept only for the first node
+    int32_t mInstanceCount;
+
+    //! Add a child node, setup the right parent node for it
+    //! \param pc Node to be 'adopted'
+    inline Node &push_back(Node *pc) {
+        mChildren.push_back(pc);
+        pc->mParent = this;
+        return *this;
+    }
+};
+// ---------------------------------------------------------------------------
+/** Helper structure analogue to aiScene */
+struct Scene {
+    //! List of all materials loaded
+    //! NOTE: 3ds references materials globally
+    std::vector<Material> mMaterials;
+
+    //! List of all meshes loaded
+    std::vector<Mesh> mMeshes;
+
+    //! List of all cameras loaded
+    std::vector<aiCamera *> mCameras;
+
+    //! List of all lights loaded
+    std::vector<aiLight *> mLights;
+
+    //! Pointer to the root node of the scene
+    // --- moved to main class
+    // Node* pcRootNode;
+};
+
+} // end of namespace D3DS
+} // end of namespace Assimp
+
+#endif // AI_XFILEHELPER_H_INC
diff --git a/src/mesh/assimp-master/code/AssetLib/3DS/3DSLoader.cpp b/src/mesh/assimp-master/code/AssetLib/3DS/3DSLoader.cpp
new file mode 100644
index 0000000..0ec8b87
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/3DS/3DSLoader.cpp
@@ -0,0 +1,1336 @@
+/*
+---------------------------------------------------------------------------
+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  3DSLoader.cpp
+ *  @brief Implementation of the 3ds importer class
+ *
+ *  http://www.the-labs.com/Blender/3DS-details.html
+ */
+
+#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER
+
+#include "3DSLoader.h"
+#include <assimp/StringComparison.h>
+#include <assimp/importerdesc.h>
+#include <assimp/scene.h>
+#include <assimp/DefaultLogger.hpp>
+#include <assimp/IOSystem.hpp>
+
+using namespace Assimp;
+
+static const aiImporterDesc desc = {
+    "Discreet 3DS Importer",
+    "",
+    "",
+    "Limited animation support",
+    aiImporterFlags_SupportBinaryFlavour,
+    0,
+    0,
+    0,
+    0,
+    "3ds prj"
+};
+
+// ------------------------------------------------------------------------------------------------
+// Begins a new parsing block
+// - Reads the current chunk and validates it
+// - computes its length
+#define ASSIMP_3DS_BEGIN_CHUNK()                                              \
+    while (true) {                                                            \
+        if (stream->GetRemainingSizeToLimit() < sizeof(Discreet3DS::Chunk)) { \
+            return;                                                           \
+        }                                                                     \
+        Discreet3DS::Chunk chunk;                                             \
+        ReadChunk(&chunk);                                                    \
+        int chunkSize = chunk.Size - sizeof(Discreet3DS::Chunk);              \
+        if (chunkSize <= 0)                                                   \
+            continue;                                                         \
+        const unsigned int oldReadLimit = stream->SetReadLimit(               \
+                stream->GetCurrentPos() + chunkSize);
+
+// ------------------------------------------------------------------------------------------------
+// End a parsing block
+// Must follow at the end of each parsing block, reset chunk end marker to previous value
+#define ASSIMP_3DS_END_CHUNK()                  \
+    stream->SkipToReadLimit();                  \
+    stream->SetReadLimit(oldReadLimit);         \
+    if (stream->GetRemainingSizeToLimit() == 0) \
+        return;                                 \
+    }
+
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+Discreet3DSImporter::Discreet3DSImporter() :
+        stream(), mLastNodeIndex(), mCurrentNode(), mRootNode(), mScene(), mMasterScale(), bHasBG(), bIsPrj() {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+Discreet3DSImporter::~Discreet3DSImporter() {
+    // empty
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the class can handle the format of the given file.
+bool Discreet3DSImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {
+    static const uint16_t token[] = { 0x4d4d, 0x3dc2 /*, 0x3daa */ };
+    return CheckMagicToken(pIOHandler, pFile, token, AI_COUNT_OF(token), 0, sizeof token[0]);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Loader registry entry
+const aiImporterDesc *Discreet3DSImporter::GetInfo() const {
+    return &desc;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Setup configuration properties
+void Discreet3DSImporter::SetupProperties(const Importer * /*pImp*/) {
+    // nothing to be done for the moment
+}
+
+// ------------------------------------------------------------------------------------------------
+// Imports the given file into the given scene structure.
+void Discreet3DSImporter::InternReadFile(const std::string &pFile,
+        aiScene *pScene, IOSystem *pIOHandler) {
+
+    auto theFile = pIOHandler->Open(pFile, "rb");
+    if (!theFile) {
+        throw DeadlyImportError("3DS: Could not open ", pFile);
+    }
+
+    StreamReaderLE theStream(theFile);
+
+    // We should have at least one chunk
+    if (theStream.GetRemainingSize() < 16) {
+        throw DeadlyImportError("3DS file is either empty or corrupt: ", pFile);
+    }
+    this->stream = &theStream;
+
+    // Allocate our temporary 3DS representation
+    D3DS::Scene _scene;
+    mScene = &_scene;
+
+    // Initialize members
+    D3DS::Node _rootNode("UNNAMED");
+    mLastNodeIndex = -1;
+    mCurrentNode = &_rootNode;
+    mRootNode = mCurrentNode;
+    mRootNode->mHierarchyPos = -1;
+    mRootNode->mHierarchyIndex = -1;
+    mRootNode->mParent = nullptr;
+    mMasterScale = 1.0f;
+    mBackgroundImage = std::string();
+    bHasBG = false;
+    bIsPrj = false;
+
+    // Parse the file
+    ParseMainChunk();
+
+    // Process all meshes in the file. First check whether all
+    // face indices have valid values. The generate our
+    // internal verbose representation. Finally compute normal
+    // vectors from the smoothing groups we read from the
+    // file.
+    for (auto &mesh : mScene->mMeshes) {
+        if (mesh.mFaces.size() > 0 && mesh.mPositions.size() == 0) {
+            throw DeadlyImportError("3DS file contains faces but no vertices: ", pFile);
+        }
+        CheckIndices(mesh);
+        MakeUnique(mesh);
+        ComputeNormalsWithSmoothingsGroups<D3DS::Face>(mesh);
+    }
+
+    // Replace all occurrences of the default material with a
+    // valid material. Generate it if no material containing
+    // DEFAULT in its name has been found in the file
+    ReplaceDefaultMaterial();
+
+    // Convert the scene from our internal representation to an
+    // aiScene object. This involves copying all meshes, lights
+    // and cameras to the scene
+    ConvertScene(pScene);
+
+    // Generate the node graph for the scene. This is a little bit
+    // tricky since we'll need to split some meshes into sub-meshes
+    GenerateNodeGraph(pScene);
+
+    // Now apply the master scaling factor to the scene
+    ApplyMasterScale(pScene);
+
+    // Our internal scene representation and the root
+    // node will be automatically deleted, so the whole hierarchy will follow
+
+    AI_DEBUG_INVALIDATE_PTR(mRootNode);
+    AI_DEBUG_INVALIDATE_PTR(mScene);
+    AI_DEBUG_INVALIDATE_PTR(this->stream);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Applies a master-scaling factor to the imported scene
+void Discreet3DSImporter::ApplyMasterScale(aiScene *pScene) {
+    // There are some 3DS files with a zero scaling factor
+    if (!mMasterScale)
+        mMasterScale = 1.0f;
+    else
+        mMasterScale = 1.0f / mMasterScale;
+
+    // Construct an uniform scaling matrix and multiply with it
+    pScene->mRootNode->mTransformation *= aiMatrix4x4(
+            mMasterScale, 0.0f, 0.0f, 0.0f,
+            0.0f, mMasterScale, 0.0f, 0.0f,
+            0.0f, 0.0f, mMasterScale, 0.0f,
+            0.0f, 0.0f, 0.0f, 1.0f);
+
+    // Check whether a scaling track is assigned to the root node.
+}
+
+// ------------------------------------------------------------------------------------------------
+// Reads a new chunk from the file
+void Discreet3DSImporter::ReadChunk(Discreet3DS::Chunk *pcOut) {
+    ai_assert(pcOut != nullptr);
+
+    pcOut->Flag = stream->GetI2();
+    pcOut->Size = stream->GetI4();
+
+    if (pcOut->Size - sizeof(Discreet3DS::Chunk) > stream->GetRemainingSize()) {
+        throw DeadlyImportError("Chunk is too large");
+    }
+
+    if (pcOut->Size - sizeof(Discreet3DS::Chunk) > stream->GetRemainingSizeToLimit()) {
+        ASSIMP_LOG_ERROR("3DS: Chunk overflow");
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Skip a chunk
+void Discreet3DSImporter::SkipChunk() {
+    Discreet3DS::Chunk psChunk;
+    ReadChunk(&psChunk);
+
+    stream->IncPtr(psChunk.Size - sizeof(Discreet3DS::Chunk));
+    return;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Process the primary chunk of the file
+void Discreet3DSImporter::ParseMainChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // get chunk type
+    switch (chunk.Flag) {
+
+    case Discreet3DS::CHUNK_PRJ:
+        bIsPrj = true;
+        break;
+    case Discreet3DS::CHUNK_MAIN:
+        ParseEditorChunk();
+        break;
+    };
+
+    ASSIMP_3DS_END_CHUNK();
+    // recursively continue processing this hierarchy level
+    return ParseMainChunk();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseEditorChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_OBJMESH:
+
+        ParseObjectChunk();
+        break;
+
+    // NOTE: In several documentations in the internet this
+    // chunk appears at different locations
+    case Discreet3DS::CHUNK_KEYFRAMER:
+
+        ParseKeyframeChunk();
+        break;
+
+    case Discreet3DS::CHUNK_VERSION: {
+        // print the version number
+        char buff[10];
+        ASSIMP_itoa10(buff, stream->GetI2());
+        ASSIMP_LOG_INFO("3DS file format version: ", buff);
+    } break;
+    };
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseObjectChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_OBJBLOCK: {
+        unsigned int cnt = 0;
+        const char *sz = (const char *)stream->GetPtr();
+
+        // Get the name of the geometry object
+        while (stream->GetI1())
+            ++cnt;
+        ParseChunk(sz, cnt);
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_MATERIAL:
+
+        // Add a new material to the list
+        mScene->mMaterials.push_back(D3DS::Material(std::string("UNNAMED_" + ai_to_string(mScene->mMaterials.size()))));
+        ParseMaterialChunk();
+        break;
+
+    case Discreet3DS::CHUNK_AMBCOLOR:
+
+        // This is the ambient base color of the scene.
+        // We add it to the ambient color of all materials
+        ParseColorChunk(&mClrAmbient, true);
+        if (is_qnan(mClrAmbient.r)) {
+            // We failed to read the ambient base color.
+            ASSIMP_LOG_ERROR("3DS: Failed to read ambient base color");
+            mClrAmbient.r = mClrAmbient.g = mClrAmbient.b = 0.0f;
+        }
+        break;
+
+    case Discreet3DS::CHUNK_BIT_MAP: {
+        // Specifies the background image. The string should already be
+        // properly 0 terminated but we need to be sure
+        unsigned int cnt = 0;
+        const char *sz = (const char *)stream->GetPtr();
+        while (stream->GetI1())
+            ++cnt;
+        mBackgroundImage = std::string(sz, cnt);
+    } break;
+
+    case Discreet3DS::CHUNK_BIT_MAP_EXISTS:
+        bHasBG = true;
+        break;
+
+    case Discreet3DS::CHUNK_MASTER_SCALE:
+        // Scene master scaling factor
+        mMasterScale = stream->GetF4();
+        break;
+    };
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseChunk(const char *name, unsigned int num) {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // IMPLEMENTATION NOTE;
+    // Cameras or lights define their transformation in their parent node and in the
+    // corresponding light or camera chunks. However, we read and process the latter
+    // to to be able to return valid cameras/lights even if no scenegraph is given.
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_TRIMESH: {
+        // this starts a new triangle mesh
+        mScene->mMeshes.push_back(D3DS::Mesh(std::string(name, num)));
+
+        // Read mesh chunks
+        ParseMeshChunk();
+    } break;
+
+    case Discreet3DS::CHUNK_LIGHT: {
+        // This starts a new light
+        aiLight *light = new aiLight();
+        mScene->mLights.push_back(light);
+
+        light->mName.Set(std::string(name, num));
+
+        // First read the position of the light
+        light->mPosition.x = stream->GetF4();
+        light->mPosition.y = stream->GetF4();
+        light->mPosition.z = stream->GetF4();
+
+        light->mColorDiffuse = aiColor3D(1.f, 1.f, 1.f);
+
+        // Now check for further subchunks
+        if (!bIsPrj) /* fixme */
+            ParseLightChunk();
+
+        // The specular light color is identical the the diffuse light color. The ambient light color
+        // is equal to the ambient base color of the whole scene.
+        light->mColorSpecular = light->mColorDiffuse;
+        light->mColorAmbient = mClrAmbient;
+
+        if (light->mType == aiLightSource_UNDEFINED) {
+            // It must be a point light
+            light->mType = aiLightSource_POINT;
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_CAMERA: {
+        // This starts a new camera
+        aiCamera *camera = new aiCamera();
+        mScene->mCameras.push_back(camera);
+        camera->mName.Set(std::string(name, num));
+
+        // First read the position of the camera
+        camera->mPosition.x = stream->GetF4();
+        camera->mPosition.y = stream->GetF4();
+        camera->mPosition.z = stream->GetF4();
+
+        // Then the camera target
+        camera->mLookAt.x = stream->GetF4() - camera->mPosition.x;
+        camera->mLookAt.y = stream->GetF4() - camera->mPosition.y;
+        camera->mLookAt.z = stream->GetF4() - camera->mPosition.z;
+        ai_real len = camera->mLookAt.Length();
+        if (len < 1e-5) {
+
+            // There are some files with lookat == position. Don't know why or whether it's ok or not.
+            ASSIMP_LOG_ERROR("3DS: Unable to read proper camera look-at vector");
+            camera->mLookAt = aiVector3D(0.0, 1.0, 0.0);
+
+        } else
+            camera->mLookAt /= len;
+
+        // And finally - the camera rotation angle, in counter clockwise direction
+        const ai_real angle = AI_DEG_TO_RAD(stream->GetF4());
+        aiQuaternion quat(camera->mLookAt, angle);
+        camera->mUp = quat.GetMatrix() * aiVector3D(0.0, 1.0, 0.0);
+
+        // Read the lense angle
+        camera->mHorizontalFOV = AI_DEG_TO_RAD(stream->GetF4());
+        if (camera->mHorizontalFOV < 0.001f) {
+            camera->mHorizontalFOV = float(AI_DEG_TO_RAD(45.f));
+        }
+
+        // Now check for further subchunks
+        if (!bIsPrj) /* fixme */ {
+            ParseCameraChunk();
+        }
+    } break;
+    };
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseLightChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+    aiLight *light = mScene->mLights.back();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_DL_SPOTLIGHT:
+        // Now we can be sure that the light is a spot light
+        light->mType = aiLightSource_SPOT;
+
+        // We wouldn't need to normalize here, but we do it
+        light->mDirection.x = stream->GetF4() - light->mPosition.x;
+        light->mDirection.y = stream->GetF4() - light->mPosition.y;
+        light->mDirection.z = stream->GetF4() - light->mPosition.z;
+        light->mDirection.Normalize();
+
+        // Now the hotspot and falloff angles - in degrees
+        light->mAngleInnerCone = AI_DEG_TO_RAD(stream->GetF4());
+
+        // FIX: the falloff angle is just an offset
+        light->mAngleOuterCone = light->mAngleInnerCone + AI_DEG_TO_RAD(stream->GetF4());
+        break;
+
+        // intensity multiplier
+    case Discreet3DS::CHUNK_DL_MULTIPLIER:
+        light->mColorDiffuse = light->mColorDiffuse * stream->GetF4();
+        break;
+
+        // light color
+    case Discreet3DS::CHUNK_RGBF:
+    case Discreet3DS::CHUNK_LINRGBF:
+        light->mColorDiffuse.r *= stream->GetF4();
+        light->mColorDiffuse.g *= stream->GetF4();
+        light->mColorDiffuse.b *= stream->GetF4();
+        break;
+
+        // light attenuation
+    case Discreet3DS::CHUNK_DL_ATTENUATE:
+        light->mAttenuationLinear = stream->GetF4();
+        break;
+    };
+
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseCameraChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+    aiCamera *camera = mScene->mCameras.back();
+
+    // get chunk type
+    switch (chunk.Flag) {
+        // near and far clip plane
+    case Discreet3DS::CHUNK_CAM_RANGES:
+        camera->mClipPlaneNear = stream->GetF4();
+        camera->mClipPlaneFar = stream->GetF4();
+        break;
+    }
+
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseKeyframeChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_TRACKCAMTGT:
+    case Discreet3DS::CHUNK_TRACKSPOTL:
+    case Discreet3DS::CHUNK_TRACKCAMERA:
+    case Discreet3DS::CHUNK_TRACKINFO:
+    case Discreet3DS::CHUNK_TRACKLIGHT:
+    case Discreet3DS::CHUNK_TRACKLIGTGT:
+
+        // this starts a new mesh hierarchy chunk
+        ParseHierarchyChunk(chunk.Flag);
+        break;
+    };
+
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Little helper function for ParseHierarchyChunk
+void Discreet3DSImporter::InverseNodeSearch(D3DS::Node *pcNode, D3DS::Node *pcCurrent) {
+    if (!pcCurrent) {
+        mRootNode->push_back(pcNode);
+        return;
+    }
+
+    if (pcCurrent->mHierarchyPos == pcNode->mHierarchyPos) {
+        if (pcCurrent->mParent) {
+            pcCurrent->mParent->push_back(pcNode);
+        } else
+            pcCurrent->push_back(pcNode);
+        return;
+    }
+    return InverseNodeSearch(pcNode, pcCurrent->mParent);
+}
+
+// ------------------------------------------------------------------------------------------------
+// Find a node with a specific name in the import hierarchy
+D3DS::Node *FindNode(D3DS::Node *root, const std::string &name) {
+    if (root->mName == name) {
+        return root;
+    }
+
+    for (std::vector<D3DS::Node *>::iterator it = root->mChildren.begin(); it != root->mChildren.end(); ++it) {
+        D3DS::Node *nd = FindNode(*it, name);
+        if (nullptr != nd) {
+            return nd;
+        }
+    }
+
+    return nullptr;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Binary predicate for std::unique()
+template <class T>
+bool KeyUniqueCompare(const T &first, const T &second) {
+    return first.mTime == second.mTime;
+}
+
+// ------------------------------------------------------------------------------------------------
+// Skip some additional import data.
+void Discreet3DSImporter::SkipTCBInfo() {
+    unsigned int flags = stream->GetI2();
+
+    if (!flags) {
+        // Currently we can't do anything with these values. They occur
+        // quite rare, so it wouldn't be worth the effort implementing
+        // them. 3DS is not really suitable for complex animations,
+        // so full support is not required.
+        ASSIMP_LOG_WARN("3DS: Skipping TCB animation info");
+    }
+
+    if (flags & Discreet3DS::KEY_USE_TENS) {
+        stream->IncPtr(4);
+    }
+    if (flags & Discreet3DS::KEY_USE_BIAS) {
+        stream->IncPtr(4);
+    }
+    if (flags & Discreet3DS::KEY_USE_CONT) {
+        stream->IncPtr(4);
+    }
+    if (flags & Discreet3DS::KEY_USE_EASE_FROM) {
+        stream->IncPtr(4);
+    }
+    if (flags & Discreet3DS::KEY_USE_EASE_TO) {
+        stream->IncPtr(4);
+    }
+}
+
+// ------------------------------------------------------------------------------------------------
+// Read hierarchy and keyframe info
+void Discreet3DSImporter::ParseHierarchyChunk(uint16_t parent) {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_TRACKOBJNAME:
+
+        // This is the name of the object to which the track applies. The chunk also
+        // defines the position of this object in the hierarchy.
+        {
+
+            // First of all: get the name of the object
+            unsigned int cnt = 0;
+            const char *sz = (const char *)stream->GetPtr();
+
+            while (stream->GetI1())
+                ++cnt;
+            std::string name = std::string(sz, cnt);
+
+            // Now find out whether we have this node already (target animation channels
+            // are stored with a separate object ID)
+            D3DS::Node *pcNode = FindNode(mRootNode, name);
+            int instanceNumber = 1;
+
+            if (pcNode) {
+                // if the source is not a CHUNK_TRACKINFO block it won't be an object instance
+                if (parent != Discreet3DS::CHUNK_TRACKINFO) {
+                    mCurrentNode = pcNode;
+                    break;
+                }
+                pcNode->mInstanceCount++;
+                instanceNumber = pcNode->mInstanceCount;
+            }
+            pcNode = new D3DS::Node(name);
+            pcNode->mInstanceNumber = instanceNumber;
+
+            // There are two unknown values which we can safely ignore
+            stream->IncPtr(4);
+
+            // Now read the hierarchy position of the object
+            uint16_t hierarchy = stream->GetI2() + 1;
+            pcNode->mHierarchyPos = hierarchy;
+            pcNode->mHierarchyIndex = mLastNodeIndex;
+
+            // And find a proper position in the graph for it
+            if (mCurrentNode && mCurrentNode->mHierarchyPos == hierarchy) {
+
+                // add to the parent of the last touched node
+                mCurrentNode->mParent->push_back(pcNode);
+                mLastNodeIndex++;
+            } else if (hierarchy >= mLastNodeIndex) {
+
+                // place it at the current position in the hierarchy
+                mCurrentNode->push_back(pcNode);
+                mLastNodeIndex = hierarchy;
+            } else {
+                // need to go back to the specified position in the hierarchy.
+                InverseNodeSearch(pcNode, mCurrentNode);
+                mLastNodeIndex++;
+            }
+            // Make this node the current node
+            mCurrentNode = pcNode;
+        }
+        break;
+
+    case Discreet3DS::CHUNK_TRACKDUMMYOBJNAME:
+
+        // This is the "real" name of a $$$DUMMY object
+        {
+            const char *sz = (const char *)stream->GetPtr();
+            while (stream->GetI1())
+                ;
+
+            // If object name is DUMMY, take this one instead
+            if (mCurrentNode->mName == "$$$DUMMY") {
+                mCurrentNode->mName = std::string(sz);
+                break;
+            }
+        }
+        break;
+
+    case Discreet3DS::CHUNK_TRACKPIVOT:
+
+        if (Discreet3DS::CHUNK_TRACKINFO != parent) {
+            ASSIMP_LOG_WARN("3DS: Skipping pivot subchunk for non usual object");
+            break;
+        }
+
+        // Pivot = origin of rotation and scaling
+        mCurrentNode->vPivot.x = stream->GetF4();
+        mCurrentNode->vPivot.y = stream->GetF4();
+        mCurrentNode->vPivot.z = stream->GetF4();
+        break;
+
+        // ////////////////////////////////////////////////////////////////////
+        // POSITION KEYFRAME
+    case Discreet3DS::CHUNK_TRACKPOS: {
+        stream->IncPtr(10);
+        const unsigned int numFrames = stream->GetI4();
+        bool sortKeys = false;
+
+        // This could also be meant as the target position for
+        // (targeted) lights and cameras
+        std::vector<aiVectorKey> *l;
+        if (Discreet3DS::CHUNK_TRACKCAMTGT == parent || Discreet3DS::CHUNK_TRACKLIGTGT == parent) {
+            l = &mCurrentNode->aTargetPositionKeys;
+        } else
+            l = &mCurrentNode->aPositionKeys;
+
+        l->reserve(numFrames);
+        for (unsigned int i = 0; i < numFrames; ++i) {
+            const unsigned int fidx = stream->GetI4();
+
+            // Setup a new position key
+            aiVectorKey v;
+            v.mTime = (double)fidx;
+
+            SkipTCBInfo();
+            v.mValue.x = stream->GetF4();
+            v.mValue.y = stream->GetF4();
+            v.mValue.z = stream->GetF4();
+
+            // check whether we'll need to sort the keys
+            if (!l->empty() && v.mTime <= l->back().mTime)
+                sortKeys = true;
+
+            // Add the new keyframe to the list
+            l->push_back(v);
+        }
+
+        // Sort all keys with ascending time values and remove duplicates?
+        if (sortKeys) {
+            std::stable_sort(l->begin(), l->end());
+            l->erase(std::unique(l->begin(), l->end(), &KeyUniqueCompare<aiVectorKey>), l->end());
+        }
+    }
+
+    break;
+
+        // ////////////////////////////////////////////////////////////////////
+        // CAMERA ROLL KEYFRAME
+    case Discreet3DS::CHUNK_TRACKROLL: {
+        // roll keys are accepted for cameras only
+        if (parent != Discreet3DS::CHUNK_TRACKCAMERA) {
+            ASSIMP_LOG_WARN("3DS: Ignoring roll track for non-camera object");
+            break;
+        }
+        bool sortKeys = false;
+        std::vector<aiFloatKey> *l = &mCurrentNode->aCameraRollKeys;
+
+        stream->IncPtr(10);
+        const unsigned int numFrames = stream->GetI4();
+        l->reserve(numFrames);
+        for (unsigned int i = 0; i < numFrames; ++i) {
+            const unsigned int fidx = stream->GetI4();
+
+            // Setup a new position key
+            aiFloatKey v;
+            v.mTime = (double)fidx;
+
+            // This is just a single float
+            SkipTCBInfo();
+            v.mValue = stream->GetF4();
+
+            // Check whether we'll need to sort the keys
+            if (!l->empty() && v.mTime <= l->back().mTime)
+                sortKeys = true;
+
+            // Add the new keyframe to the list
+            l->push_back(v);
+        }
+
+        // Sort all keys with ascending time values and remove duplicates?
+        if (sortKeys) {
+            std::stable_sort(l->begin(), l->end());
+            l->erase(std::unique(l->begin(), l->end(), &KeyUniqueCompare<aiFloatKey>), l->end());
+        }
+    } break;
+
+        // ////////////////////////////////////////////////////////////////////
+        // CAMERA FOV KEYFRAME
+    case Discreet3DS::CHUNK_TRACKFOV: {
+        ASSIMP_LOG_ERROR("3DS: Skipping FOV animation track. "
+                         "This is not supported");
+    } break;
+
+        // ////////////////////////////////////////////////////////////////////
+        // ROTATION KEYFRAME
+    case Discreet3DS::CHUNK_TRACKROTATE: {
+        stream->IncPtr(10);
+        const unsigned int numFrames = stream->GetI4();
+
+        bool sortKeys = false;
+        std::vector<aiQuatKey> *l = &mCurrentNode->aRotationKeys;
+        l->reserve(numFrames);
+
+        for (unsigned int i = 0; i < numFrames; ++i) {
+            const unsigned int fidx = stream->GetI4();
+            SkipTCBInfo();
+
+            aiQuatKey v;
+            v.mTime = (double)fidx;
+
+            // The rotation keyframe is given as an axis-angle pair
+            const float rad = stream->GetF4();
+            aiVector3D axis;
+            axis.x = stream->GetF4();
+            axis.y = stream->GetF4();
+            axis.z = stream->GetF4();
+
+            if (!axis.x && !axis.y && !axis.z)
+                axis.y = 1.f;
+
+            // Construct a rotation quaternion from the axis-angle pair
+            v.mValue = aiQuaternion(axis, rad);
+
+            // Check whether we'll need to sort the keys
+            if (!l->empty() && v.mTime <= l->back().mTime)
+                sortKeys = true;
+
+            // add the new keyframe to the list
+            l->push_back(v);
+        }
+        // Sort all keys with ascending time values and remove duplicates?
+        if (sortKeys) {
+            std::stable_sort(l->begin(), l->end());
+            l->erase(std::unique(l->begin(), l->end(), &KeyUniqueCompare<aiQuatKey>), l->end());
+        }
+    } break;
+
+        // ////////////////////////////////////////////////////////////////////
+        // SCALING KEYFRAME
+    case Discreet3DS::CHUNK_TRACKSCALE: {
+        stream->IncPtr(10);
+        const unsigned int numFrames = stream->GetI2();
+        stream->IncPtr(2);
+
+        bool sortKeys = false;
+        std::vector<aiVectorKey> *l = &mCurrentNode->aScalingKeys;
+        l->reserve(numFrames);
+
+        for (unsigned int i = 0; i < numFrames; ++i) {
+            const unsigned int fidx = stream->GetI4();
+            SkipTCBInfo();
+
+            // Setup a new key
+            aiVectorKey v;
+            v.mTime = (double)fidx;
+
+            // ... and read its value
+            v.mValue.x = stream->GetF4();
+            v.mValue.y = stream->GetF4();
+            v.mValue.z = stream->GetF4();
+
+            // check whether we'll need to sort the keys
+            if (!l->empty() && v.mTime <= l->back().mTime)
+                sortKeys = true;
+
+            // Remove zero-scalings on singular axes - they've been reported to be there erroneously in some strange files
+            if (!v.mValue.x) v.mValue.x = 1.f;
+            if (!v.mValue.y) v.mValue.y = 1.f;
+            if (!v.mValue.z) v.mValue.z = 1.f;
+
+            l->push_back(v);
+        }
+        // Sort all keys with ascending time values and remove duplicates?
+        if (sortKeys) {
+            std::stable_sort(l->begin(), l->end());
+            l->erase(std::unique(l->begin(), l->end(), &KeyUniqueCompare<aiVectorKey>), l->end());
+        }
+    } break;
+    };
+
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Read a face chunk - it contains smoothing groups and material assignments
+void Discreet3DSImporter::ParseFaceChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // Get the mesh we're currently working on
+    D3DS::Mesh &mMesh = mScene->mMeshes.back();
+
+    // Get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_SMOOLIST: {
+        // This is the list of smoothing groups - a bitfield for every face.
+        // Up to 32 smoothing groups assigned to a single face.
+        unsigned int num = chunkSize / 4, m = 0;
+        if (num > mMesh.mFaces.size()) {
+            throw DeadlyImportError("3DS: More smoothing groups than faces");
+        }
+        for (std::vector<D3DS::Face>::iterator i = mMesh.mFaces.begin(); m != num; ++i, ++m) {
+            // nth bit is set for nth smoothing group
+            (*i).iSmoothGroup = stream->GetI4();
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_FACEMAT: {
+        // at fist an asciiz with the material name
+        const char *sz = (const char *)stream->GetPtr();
+        while (stream->GetI1())
+            ;
+
+        // find the index of the material
+        unsigned int idx = 0xcdcdcdcd, cnt = 0;
+        for (std::vector<D3DS::Material>::const_iterator i = mScene->mMaterials.begin(); i != mScene->mMaterials.end(); ++i, ++cnt) {
+            // use case independent comparisons. hopefully it will work.
+            if ((*i).mName.length() && !ASSIMP_stricmp(sz, (*i).mName.c_str())) {
+                idx = cnt;
+                break;
+            }
+        }
+        if (0xcdcdcdcd == idx) {
+            ASSIMP_LOG_ERROR("3DS: Unknown material: ", sz);
+        }
+
+        // Now continue and read all material indices
+        cnt = (uint16_t)stream->GetI2();
+        for (unsigned int i = 0; i < cnt; ++i) {
+            unsigned int fidx = (uint16_t)stream->GetI2();
+
+            // check range
+            if (fidx >= mMesh.mFaceMaterials.size()) {
+                ASSIMP_LOG_ERROR("3DS: Invalid face index in face material list");
+            } else
+                mMesh.mFaceMaterials[fidx] = idx;
+        }
+    } break;
+    };
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Read a mesh chunk. Here's the actual mesh data
+void Discreet3DSImporter::ParseMeshChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // Get the mesh we're currently working on
+    D3DS::Mesh &mMesh = mScene->mMeshes.back();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_VERTLIST: {
+        // This is the list of all vertices in the current mesh
+        int num = (int)(uint16_t)stream->GetI2();
+        mMesh.mPositions.reserve(num);
+        while (num-- > 0) {
+            aiVector3D v;
+            v.x = stream->GetF4();
+            v.y = stream->GetF4();
+            v.z = stream->GetF4();
+            mMesh.mPositions.push_back(v);
+        }
+    } break;
+    case Discreet3DS::CHUNK_TRMATRIX: {
+        // This is the RLEATIVE transformation matrix of the current mesh. Vertices are
+        // pretransformed by this matrix wonder.
+        mMesh.mMat.a1 = stream->GetF4();
+        mMesh.mMat.b1 = stream->GetF4();
+        mMesh.mMat.c1 = stream->GetF4();
+        mMesh.mMat.a2 = stream->GetF4();
+        mMesh.mMat.b2 = stream->GetF4();
+        mMesh.mMat.c2 = stream->GetF4();
+        mMesh.mMat.a3 = stream->GetF4();
+        mMesh.mMat.b3 = stream->GetF4();
+        mMesh.mMat.c3 = stream->GetF4();
+        mMesh.mMat.a4 = stream->GetF4();
+        mMesh.mMat.b4 = stream->GetF4();
+        mMesh.mMat.c4 = stream->GetF4();
+    } break;
+
+    case Discreet3DS::CHUNK_MAPLIST: {
+        // This is the list of all UV coords in the current mesh
+        int num = (int)(uint16_t)stream->GetI2();
+        mMesh.mTexCoords.reserve(num);
+        while (num-- > 0) {
+            aiVector3D v;
+            v.x = stream->GetF4();
+            v.y = stream->GetF4();
+            mMesh.mTexCoords.push_back(v);
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_FACELIST: {
+        // This is the list of all faces in the current mesh
+        int num = (int)(uint16_t)stream->GetI2();
+        mMesh.mFaces.reserve(num);
+        while (num-- > 0) {
+            // 3DS faces are ALWAYS triangles
+            mMesh.mFaces.push_back(D3DS::Face());
+            D3DS::Face &sFace = mMesh.mFaces.back();
+
+            sFace.mIndices[0] = (uint16_t)stream->GetI2();
+            sFace.mIndices[1] = (uint16_t)stream->GetI2();
+            sFace.mIndices[2] = (uint16_t)stream->GetI2();
+
+            stream->IncPtr(2); // skip edge visibility flag
+        }
+
+        // Resize the material array (0xcdcdcdcd marks the default material; so if a face is
+        // not referenced by a material, $$DEFAULT will be assigned to it)
+        mMesh.mFaceMaterials.resize(mMesh.mFaces.size(), 0xcdcdcdcd);
+
+        // Larger 3DS files could have multiple FACE chunks here
+        chunkSize = (int)stream->GetRemainingSizeToLimit();
+        if (chunkSize > (int)sizeof(Discreet3DS::Chunk))
+            ParseFaceChunk();
+    } break;
+    };
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Read a 3DS material chunk
+void Discreet3DSImporter::ParseMaterialChunk() {
+    ASSIMP_3DS_BEGIN_CHUNK();
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_MAT_MATNAME:
+
+    {
+        // The material name string is already zero-terminated, but we need to be sure ...
+        const char *sz = (const char *)stream->GetPtr();
+        unsigned int cnt = 0;
+        while (stream->GetI1())
+            ++cnt;
+
+        if (!cnt) {
+            // This may not be, we use the default name instead
+            ASSIMP_LOG_ERROR("3DS: Empty material name");
+        } else
+            mScene->mMaterials.back().mName = std::string(sz, cnt);
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_DIFFUSE: {
+        // This is the diffuse material color
+        aiColor3D *pc = &mScene->mMaterials.back().mDiffuse;
+        ParseColorChunk(pc);
+        if (is_qnan(pc->r)) {
+            // color chunk is invalid. Simply ignore it
+            ASSIMP_LOG_ERROR("3DS: Unable to read DIFFUSE chunk");
+            pc->r = pc->g = pc->b = 1.0f;
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_SPECULAR: {
+        // This is the specular material color
+        aiColor3D *pc = &mScene->mMaterials.back().mSpecular;
+        ParseColorChunk(pc);
+        if (is_qnan(pc->r)) {
+            // color chunk is invalid. Simply ignore it
+            ASSIMP_LOG_ERROR("3DS: Unable to read SPECULAR chunk");
+            pc->r = pc->g = pc->b = 1.0f;
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_AMBIENT: {
+        // This is the ambient material color
+        aiColor3D *pc = &mScene->mMaterials.back().mAmbient;
+        ParseColorChunk(pc);
+        if (is_qnan(pc->r)) {
+            // color chunk is invalid. Simply ignore it
+            ASSIMP_LOG_ERROR("3DS: Unable to read AMBIENT chunk");
+            pc->r = pc->g = pc->b = 0.0f;
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_SELF_ILLUM: {
+        // This is the emissive material color
+        aiColor3D *pc = &mScene->mMaterials.back().mEmissive;
+        ParseColorChunk(pc);
+        if (is_qnan(pc->r)) {
+            // color chunk is invalid. Simply ignore it
+            ASSIMP_LOG_ERROR("3DS: Unable to read EMISSIVE chunk");
+            pc->r = pc->g = pc->b = 0.0f;
+        }
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_TRANSPARENCY: {
+        // This is the material's transparency
+        ai_real *pcf = &mScene->mMaterials.back().mTransparency;
+        *pcf = ParsePercentageChunk();
+
+        // NOTE: transparency, not opacity
+        if (is_qnan(*pcf))
+            *pcf = ai_real(1.0);
+        else
+            *pcf = ai_real(1.0) - *pcf * (ai_real)0xFFFF / ai_real(100.0);
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_SHADING:
+        // This is the material shading mode
+        mScene->mMaterials.back().mShading = (D3DS::Discreet3DS::shadetype3ds)stream->GetI2();
+        break;
+
+    case Discreet3DS::CHUNK_MAT_TWO_SIDE:
+        // This is the two-sided flag
+        mScene->mMaterials.back().mTwoSided = true;
+        break;
+
+    case Discreet3DS::CHUNK_MAT_SHININESS: { // This is the shininess of the material
+        ai_real *pcf = &mScene->mMaterials.back().mSpecularExponent;
+        *pcf = ParsePercentageChunk();
+        if (is_qnan(*pcf))
+            *pcf = 0.0;
+        else
+            *pcf *= (ai_real)0xFFFF;
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_SHININESS_PERCENT: { // This is the shininess strength of the material
+        ai_real *pcf = &mScene->mMaterials.back().mShininessStrength;
+        *pcf = ParsePercentageChunk();
+        if (is_qnan(*pcf))
+            *pcf = ai_real(0.0);
+        else
+            *pcf *= (ai_real)0xffff / ai_real(100.0);
+    } break;
+
+    case Discreet3DS::CHUNK_MAT_SELF_ILPCT: { // This is the self illumination strength of the material
+        ai_real f = ParsePercentageChunk();
+        if (is_qnan(f))
+            f = ai_real(0.0);
+        else
+            f *= (ai_real)0xFFFF / ai_real(100.0);
+        mScene->mMaterials.back().mEmissive = aiColor3D(f, f, f);
+    } break;
+
+    // Parse texture chunks
+    case Discreet3DS::CHUNK_MAT_TEXTURE:
+        // Diffuse texture
+        ParseTextureChunk(&mScene->mMaterials.back().sTexDiffuse);
+        break;
+    case Discreet3DS::CHUNK_MAT_BUMPMAP:
+        // Height map
+        ParseTextureChunk(&mScene->mMaterials.back().sTexBump);
+        break;
+    case Discreet3DS::CHUNK_MAT_OPACMAP:
+        // Opacity texture
+        ParseTextureChunk(&mScene->mMaterials.back().sTexOpacity);
+        break;
+    case Discreet3DS::CHUNK_MAT_MAT_SHINMAP:
+        // Shininess map
+        ParseTextureChunk(&mScene->mMaterials.back().sTexShininess);
+        break;
+    case Discreet3DS::CHUNK_MAT_SPECMAP:
+        // Specular map
+        ParseTextureChunk(&mScene->mMaterials.back().sTexSpecular);
+        break;
+    case Discreet3DS::CHUNK_MAT_SELFIMAP:
+        // Self-illumination (emissive) map
+        ParseTextureChunk(&mScene->mMaterials.back().sTexEmissive);
+        break;
+    case Discreet3DS::CHUNK_MAT_REFLMAP:
+        // Reflection map
+        ParseTextureChunk(&mScene->mMaterials.back().sTexReflective);
+        break;
+    };
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+void Discreet3DSImporter::ParseTextureChunk(D3DS::Texture *pcOut) {
+    ASSIMP_3DS_BEGIN_CHUNK();
+
+    // get chunk type
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_MAPFILE: {
+        // The material name string is already zero-terminated, but we need to be sure ...
+        const char *sz = (const char *)stream->GetPtr();
+        unsigned int cnt = 0;
+        while (stream->GetI1())
+            ++cnt;
+        pcOut->mMapName = std::string(sz, cnt);
+    } break;
+
+    case Discreet3DS::CHUNK_PERCENTD:
+        // Manually parse the blend factor
+        pcOut->mTextureBlend = ai_real(stream->GetF8());
+        break;
+
+    case Discreet3DS::CHUNK_PERCENTF:
+        // Manually parse the blend factor
+        pcOut->mTextureBlend = stream->GetF4();
+        break;
+
+    case Discreet3DS::CHUNK_PERCENTW:
+        // Manually parse the blend factor
+        pcOut->mTextureBlend = (ai_real)((uint16_t)stream->GetI2()) / ai_real(100.0);
+        break;
+
+    case Discreet3DS::CHUNK_MAT_MAP_USCALE:
+        // Texture coordinate scaling in the U direction
+        pcOut->mScaleU = stream->GetF4();
+        if (0.0f == pcOut->mScaleU) {
+            ASSIMP_LOG_WARN("Texture coordinate scaling in the x direction is zero. Assuming 1.");
+            pcOut->mScaleU = 1.0f;
+        }
+        break;
+    case Discreet3DS::CHUNK_MAT_MAP_VSCALE:
+        // Texture coordinate scaling in the V direction
+        pcOut->mScaleV = stream->GetF4();
+        if (0.0f == pcOut->mScaleV) {
+            ASSIMP_LOG_WARN("Texture coordinate scaling in the y direction is zero. Assuming 1.");
+            pcOut->mScaleV = 1.0f;
+        }
+        break;
+
+    case Discreet3DS::CHUNK_MAT_MAP_UOFFSET:
+        // Texture coordinate offset in the U direction
+        pcOut->mOffsetU = -stream->GetF4();
+        break;
+
+    case Discreet3DS::CHUNK_MAT_MAP_VOFFSET:
+        // Texture coordinate offset in the V direction
+        pcOut->mOffsetV = stream->GetF4();
+        break;
+
+    case Discreet3DS::CHUNK_MAT_MAP_ANG:
+        // Texture coordinate rotation, CCW in DEGREES
+        pcOut->mRotation = -AI_DEG_TO_RAD(stream->GetF4());
+        break;
+
+    case Discreet3DS::CHUNK_MAT_MAP_TILING: {
+        const uint16_t iFlags = stream->GetI2();
+
+        // Get the mapping mode (for both axes)
+        if (iFlags & 0x2u)
+            pcOut->mMapMode = aiTextureMapMode_Mirror;
+
+        else if (iFlags & 0x10u)
+            pcOut->mMapMode = aiTextureMapMode_Decal;
+
+        // wrapping in all remaining cases
+        else
+            pcOut->mMapMode = aiTextureMapMode_Wrap;
+    } break;
+    };
+
+    ASSIMP_3DS_END_CHUNK();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Read a percentage chunk
+ai_real Discreet3DSImporter::ParsePercentageChunk() {
+    Discreet3DS::Chunk chunk;
+    ReadChunk(&chunk);
+
+    if (Discreet3DS::CHUNK_PERCENTF == chunk.Flag) {
+        return stream->GetF4() * ai_real(100) / ai_real(0xFFFF);
+    } else if (Discreet3DS::CHUNK_PERCENTW == chunk.Flag) {
+        return (ai_real)((uint16_t)stream->GetI2()) / (ai_real)0xFFFF;
+    }
+
+    return get_qnan();
+}
+
+// ------------------------------------------------------------------------------------------------
+// Read a color chunk. If a percentage chunk is found instead it is read as a grayscale color
+void Discreet3DSImporter::ParseColorChunk(aiColor3D *out, bool acceptPercent) {
+    ai_assert(out != nullptr);
+
+    // error return value
+    const ai_real qnan = get_qnan();
+    static const aiColor3D clrError = aiColor3D(qnan, qnan, qnan);
+
+    Discreet3DS::Chunk chunk;
+    ReadChunk(&chunk);
+    const unsigned int diff = chunk.Size - sizeof(Discreet3DS::Chunk);
+
+    bool bGamma = false;
+
+    // Get the type of the chunk
+    switch (chunk.Flag) {
+    case Discreet3DS::CHUNK_LINRGBF:
+        bGamma = true;
+
+    case Discreet3DS::CHUNK_RGBF:
+        if (sizeof(float) * 3 > diff) {
+            *out = clrError;
+            return;
+        }
+        out->r = stream->GetF4();
+        out->g = stream->GetF4();
+        out->b = stream->GetF4();
+        break;
+
+    case Discreet3DS::CHUNK_LINRGBB:
+        bGamma = true;
+    case Discreet3DS::CHUNK_RGBB: {
+        if (sizeof(char) * 3 > diff) {
+            *out = clrError;
+            return;
+        }
+        const ai_real invVal = ai_real(1.0) / ai_real(255.0);
+        out->r = (ai_real)(uint8_t)stream->GetI1() * invVal;
+        out->g = (ai_real)(uint8_t)stream->GetI1() * invVal;
+        out->b = (ai_real)(uint8_t)stream->GetI1() * invVal;
+    } break;
+
+    // Percentage chunks are accepted, too.
+    case Discreet3DS::CHUNK_PERCENTF:
+        if (acceptPercent && 4 <= diff) {
+            out->g = out->b = out->r = stream->GetF4();
+            break;
+        }
+        *out = clrError;
+        return;
+
+    case Discreet3DS::CHUNK_PERCENTW:
+        if (acceptPercent && 1 <= diff) {
+            out->g = out->b = out->r = (ai_real)(uint8_t)stream->GetI1() / ai_real(255.0);
+            break;
+        }
+        *out = clrError;
+        return;
+
+    default:
+        stream->IncPtr(diff);
+        // Skip unknown chunks, hope this won't cause any problems.
+        return ParseColorChunk(out, acceptPercent);
+    };
+    (void)bGamma;
+}
+
+#endif // !! ASSIMP_BUILD_NO_3DS_IMPORTER
diff --git a/src/mesh/assimp-master/code/AssetLib/3DS/3DSLoader.h b/src/mesh/assimp-master/code/AssetLib/3DS/3DSLoader.h
new file mode 100644
index 0000000..f47fcfe
--- /dev/null
+++ b/src/mesh/assimp-master/code/AssetLib/3DS/3DSLoader.h
@@ -0,0 +1,289 @@
+
+/*
+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  3DSLoader.h
+ *  @brief 3DS File format loader
+ */
+#ifndef AI_3DSIMPORTER_H_INC
+#define AI_3DSIMPORTER_H_INC
+#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER
+
+#include <assimp/BaseImporter.h>
+#include <assimp/types.h>
+
+
+#include "3DSHelper.h"
+#include <assimp/StreamReader.h>
+
+struct aiNode;
+
+namespace Assimp    {
+
+
+using namespace D3DS;
+
+// ---------------------------------------------------------------------------------
+/** Importer class for 3D Studio r3 and r4 3DS files
+ */
+class Discreet3DSImporter : public BaseImporter {
+public:
+    Discreet3DSImporter();
+    ~Discreet3DSImporter();
+
+    // -------------------------------------------------------------------
+    /** Returns whether the class can handle the format of the given file.
+     * See BaseImporter::CanRead() for details.
+     */
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
+        bool checkSig) const override;
+
+    // -------------------------------------------------------------------
+    /** Called prior to ReadFile().
+     * The function is a request to the importer to update its configuration
+     * basing on the Importer's configuration property list.
+     */
+    void SetupProperties(const Importer* pImp) override;
+
+protected:
+
+    // -------------------------------------------------------------------
+    /** Return importer meta information.
+     * See #BaseImporter::GetInfo for the details
+     */
+    const aiImporterDesc* GetInfo () const override;
+
+    // -------------------------------------------------------------------
+    /** Imports the given file into the given scene structure.
+     * See BaseImporter::InternReadFile() for details
+     */
+    void InternReadFile( const std::string& pFile, aiScene* pScene,
+        IOSystem* pIOHandler) override;
+
+    // -------------------------------------------------------------------
+    /** Converts a temporary material to the outer representation
+     */
+    void ConvertMaterial(D3DS::Material& p_cMat,
+        aiMaterial& p_pcOut);
+
+    // -------------------------------------------------------------------
+    /** Read a chunk
+     *
+     *  @param pcOut Receives the current chunk
+     */
+    void ReadChunk(Discreet3DS::Chunk* pcOut);
+
+    // -------------------------------------------------------------------
+    /** Parse a percentage chunk. mCurrent will point to the next
+    * chunk behind afterwards. If no percentage chunk is found
+    * QNAN is returned.
+    */
+    ai_real ParsePercentageChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a color chunk. mCurrent will point to the next
+    * chunk behind afterwards. If no color chunk is found
+    * QNAN is returned in all members.
+    */
+    void ParseColorChunk(aiColor3D* p_pcOut,
+        bool p_bAcceptPercent = true);
+
+
+    // -------------------------------------------------------------------
+    /** Skip a chunk in the file
+    */
+    void SkipChunk();
+
+    // -------------------------------------------------------------------
+    /** Generate the nodegraph
+    */
+    void GenerateNodeGraph(aiScene* pcOut);
+
+    // -------------------------------------------------------------------
+    /** Parse a main top-level chunk in the file
+    */
+    void ParseMainChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a top-level chunk in the file
+    */
+    void ParseChunk(const char* name, unsigned int num);
+
+    // -------------------------------------------------------------------
+    /** Parse a top-level editor chunk in the file
+    */
+    void ParseEditorChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a top-level object chunk in the file
+    */
+    void ParseObjectChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a material chunk in the file
+    */
+    void ParseMaterialChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a mesh chunk in the file
+    */
+    void ParseMeshChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a light chunk in the file
+    */
+    void ParseLightChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a camera chunk in the file
+    */
+    void ParseCameraChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a face list chunk in the file
+    */
+    void ParseFaceChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a keyframe chunk in the file
+    */
+    void ParseKeyframeChunk();
+
+    // -------------------------------------------------------------------
+    /** Parse a hierarchy chunk in the file
+    */
+    void ParseHierarchyChunk(uint16_t parent);
+
+    // -------------------------------------------------------------------
+    /** Parse a texture chunk in the file
+    */
+    void ParseTextureChunk(D3DS::Texture* pcOut);
+
+    // -------------------------------------------------------------------
+    /** Convert the meshes in the file
+    */
+    void ConvertMeshes(aiScene* pcOut);
+
+    // -------------------------------------------------------------------
+    /** Replace the default material in the scene
+    */
+    void ReplaceDefaultMaterial();
+
+    bool ContainsTextures(unsigned int i) const {
+        return !mScene->mMaterials[i].sTexDiffuse.mMapName.empty() ||
+               !mScene->mMaterials[i].sTexBump.mMapName.empty() ||
+               !mScene->mMaterials[i].sTexOpacity.mMapName.empty() ||
+               !mScene->mMaterials[i].sTexEmissive.mMapName.empty() ||
+               !mScene->mMaterials[i].sTexSpecular.mMapName.empty() ||
+               !mScene->mMaterials[i].sTexShininess.mMapName.empty() ;
+    }
+
+    // -------------------------------------------------------------------
+    /** Convert the whole scene
+    */
+    void ConvertScene(aiScene* pcOut);
+
+    // -------------------------------------------------------------------
+    /** generate unique vertices for a mesh
+    */
+    void MakeUnique(D3DS::Mesh& sMesh);
+
+    // -------------------------------------------------------------------
+    /** Add a node to the node graph
+    */
+    void AddNodeToGraph(aiScene* pcSOut,aiNode* pcOut,D3DS::Node* pcIn,
+        aiMatrix4x4& absTrafo);
+
+    // -------------------------------------------------------------------
+    /** Search for a node in the graph.
+    * Called recursively
+    */
+    void InverseNodeSearch(D3DS::Node* pcNode,D3DS::Node* pcCurrent);
+
+    // -------------------------------------------------------------------
+    /** Apply the master scaling factor to the mesh
+    */
+    void ApplyMasterScale(aiScene* pScene);
+
+    // -------------------------------------------------------------------
+    /** Clamp all indices in the file to a valid range
+    */
+    void CheckIndices(D3DS::Mesh& sMesh);
+
+    // -------------------------------------------------------------------
+    /** Skip the TCB info in a track key
+    */
+    void SkipTCBInfo();
+
+protected:
+
+    /** Stream to read from */
+    StreamReaderLE* stream;
+
+    /** Last touched node index */
+    short mLastNodeIndex;
+
+    /** Current node, root node */
+    D3DS::Node* mCurrentNode, *mRootNode;
+
+    /** Scene under construction */
+    D3DS::Scene* mScene;
+
+    /** Ambient base color of the scene */
+    aiColor3D mClrAmbient;
+
+    /** Master scaling factor of the scene */
+    ai_real mMasterScale;
+
+    /** Path to the background image of the scene */
+    std::string mBackgroundImage;
+    bool bHasBG;
+
+    /** true if PRJ file */
+    bool bIsPrj;
+};
+
+} // end of namespace Assimp
+
+#endif // !! ASSIMP_BUILD_NO_3DS_IMPORTER
+
+#endif // AI_3DSIMPORTER_H_INC