add assimp submodule

1 files changed, 1336 insertions, 0 deletions

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