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/** @file  ASELoader.cpp
 *  @brief Implementation of the ASE importer class
 */

#ifndef ASSIMP_BUILD_NO_ASE_IMPORTER

#ifndef ASSIMP_BUILD_NO_3DS_IMPORTER

// internal headers
#include "ASELoader.h"
#include "Common/TargetAnimation.h"
#include <assimp/SkeletonMeshBuilder.h>
#include <assimp/StringComparison.h>

#include <assimp/importerdesc.h>
#include <assimp/scene.h>
#include <assimp/DefaultLogger.hpp>
#include <assimp/IOSystem.hpp>
#include <assimp/Importer.hpp>

#include <memory>

// utilities
#include <assimp/fast_atof.h>

using namespace Assimp;
using namespace Assimp::ASE;

static const aiImporterDesc desc = {
    "ASE Importer",
    "",
    "",
    "Similar to 3DS but text-encoded",
    aiImporterFlags_SupportTextFlavour,
    0,
    0,
    0,
    0,
    "ase ask"
};

// ------------------------------------------------------------------------------------------------
// Constructor to be privately used by Importer
ASEImporter::ASEImporter() :
        mParser(), mBuffer(), pcScene(), configRecomputeNormals(), noSkeletonMesh() {
    // empty
}

// ------------------------------------------------------------------------------------------------
// Destructor, private as well
ASEImporter::~ASEImporter() {
    // empty
}

// ------------------------------------------------------------------------------------------------
// Returns whether the class can handle the format of the given file.
bool ASEImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool cs) const {
    // check file extension
    const std::string extension = GetExtension(pFile);

    if (extension == "ase" || extension == "ask") {
        return true;
    }

    if ((!extension.length() || cs) && pIOHandler) {
        const char *tokens[] = { "*3dsmax_asciiexport" };
        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 1);
    }
    return false;
}

// ------------------------------------------------------------------------------------------------
// Loader meta information
const aiImporterDesc *ASEImporter::GetInfo() const {
    return &desc;
}

// ------------------------------------------------------------------------------------------------
// Setup configuration options
void ASEImporter::SetupProperties(const Importer *pImp) {
    configRecomputeNormals = (pImp->GetPropertyInteger(
                                      AI_CONFIG_IMPORT_ASE_RECONSTRUCT_NORMALS, 1) ?
                                      true :
                                      false);

    noSkeletonMesh = pImp->GetPropertyInteger(AI_CONFIG_IMPORT_NO_SKELETON_MESHES, 0) != 0;
}

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void ASEImporter::InternReadFile(const std::string &pFile,
        aiScene *pScene, IOSystem *pIOHandler) {
    std::unique_ptr<IOStream> file(pIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file
    if (file.get() == nullptr) {
        throw DeadlyImportError("Failed to open ASE file " + pFile + ".");
    }

    // Allocate storage and copy the contents of the file to a memory buffer
    std::vector<char> mBuffer2;
    TextFileToBuffer(file.get(), mBuffer2);

    this->mBuffer = &mBuffer2[0];
    this->pcScene = pScene;

    // ------------------------------------------------------------------
    // Guess the file format by looking at the extension
    // ASC is considered to be the older format 110,
    // ASE is the actual version 200 (that is currently written by max)
    // ------------------------------------------------------------------
    unsigned int defaultFormat;
    std::string::size_type s = pFile.length() - 1;
    switch (pFile.c_str()[s]) {

    case 'C':
    case 'c':
        defaultFormat = AI_ASE_OLD_FILE_FORMAT;
        break;
    default:
        defaultFormat = AI_ASE_NEW_FILE_FORMAT;
    };

    // Construct an ASE parser and parse the file
    ASE::Parser parser(mBuffer, defaultFormat);
    mParser = &parser;
    mParser->Parse();

    //------------------------------------------------------------------
    // Check whether we god at least one mesh. If we did - generate
    // materials and copy meshes.
    // ------------------------------------------------------------------
    if (!mParser->m_vMeshes.empty()) {

        // If absolutely no material has been loaded from the file
        // we need to generate a default material
        GenerateDefaultMaterial();

        // process all meshes
        bool tookNormals = false;
        std::vector<aiMesh *> avOutMeshes;
        avOutMeshes.reserve(mParser->m_vMeshes.size() * 2);
        for (std::vector<ASE::Mesh>::iterator i = mParser->m_vMeshes.begin(); i != mParser->m_vMeshes.end(); ++i) {
            if ((*i).bSkip) {
                continue;
            }
            BuildUniqueRepresentation(*i);

            // Need to generate proper vertex normals if necessary
            if (GenerateNormals(*i)) {
                tookNormals = true;
            }

            // Convert all meshes to aiMesh objects
            ConvertMeshes(*i, avOutMeshes);
        }
        if (tookNormals) {
            ASSIMP_LOG_DEBUG("ASE: Taking normals from the file. Use "
                             "the AI_CONFIG_IMPORT_ASE_RECONSTRUCT_NORMALS setting if you "
                             "experience problems");
        }

        // Now build the output mesh list. Remove dummies
        pScene->mNumMeshes = (unsigned int)avOutMeshes.size();
        aiMesh **pp = pScene->mMeshes = new aiMesh *[pScene->mNumMeshes];
        for (std::vector<aiMesh *>::const_iterator i = avOutMeshes.begin(); i != avOutMeshes.end(); ++i) {
            if (!(*i)->mNumFaces) {
                continue;
            }
            *pp++ = *i;
        }
        pScene->mNumMeshes = (unsigned int)(pp - pScene->mMeshes);

        // Build final material indices (remove submaterials and setup
        // the final list)
        BuildMaterialIndices();
    }

    // ------------------------------------------------------------------
    // Copy all scene graph nodes - lights, cameras, dummies and meshes
    // into one huge list.
    //------------------------------------------------------------------
    std::vector<BaseNode *> nodes;
    nodes.reserve(mParser->m_vMeshes.size() + mParser->m_vLights.size() + mParser->m_vCameras.size() + mParser->m_vDummies.size());

    // Lights
    for (auto &light : mParser->m_vLights)
        nodes.push_back(&light);
    // Cameras
    for (auto &camera : mParser->m_vCameras)
        nodes.push_back(&camera);
    // Meshes
    for (auto &mesh : mParser->m_vMeshes)
        nodes.push_back(&mesh);
    // Dummies
    for (auto &dummy : mParser->m_vDummies)
        nodes.push_back(&dummy);

    // build the final node graph
    BuildNodes(nodes);

    // build output animations
    BuildAnimations(nodes);

    // build output cameras
    BuildCameras();

    // build output lights
    BuildLights();

    // ------------------------------------------------------------------
    // If we have no meshes use the SkeletonMeshBuilder helper class
    // to build a mesh for the animation skeleton
    // FIXME: very strange results
    // ------------------------------------------------------------------
    if (!pScene->mNumMeshes) {
        pScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;
        if (!noSkeletonMesh) {
            SkeletonMeshBuilder skeleton(pScene);
        }
    }
}
// ------------------------------------------------------------------------------------------------
void ASEImporter::GenerateDefaultMaterial() {
    ai_assert(nullptr != mParser);

    bool bHas = false;
    for (std::vector<ASE::Mesh>::iterator i = mParser->m_vMeshes.begin(); i != mParser->m_vMeshes.end(); ++i) {
        if ((*i).bSkip) continue;
        if (ASE::Face::DEFAULT_MATINDEX == (*i).iMaterialIndex) {
            (*i).iMaterialIndex = (unsigned int)mParser->m_vMaterials.size();
            bHas = true;
        }
    }
    if (bHas || mParser->m_vMaterials.empty()) {
        // add a simple material without submaterials to the parser's list
        mParser->m_vMaterials.push_back(ASE::Material(AI_DEFAULT_MATERIAL_NAME));
        ASE::Material &mat = mParser->m_vMaterials.back();

        mat.mDiffuse = aiColor3D(0.6f, 0.6f, 0.6f);
        mat.mSpecular = aiColor3D(1.0f, 1.0f, 1.0f);
        mat.mAmbient = aiColor3D(0.05f, 0.05f, 0.05f);
        mat.mShading = Discreet3DS::Gouraud;
    }
}

// ------------------------------------------------------------------------------------------------
void ASEImporter::BuildAnimations(const std::vector<BaseNode *> &nodes) {
    // check whether we have at least one mesh which has animations
    std::vector<ASE::BaseNode *>::const_iterator i = nodes.begin();
    unsigned int iNum = 0;
    for (; i != nodes.end(); ++i) {

        // TODO: Implement Bezier & TCB support
        if ((*i)->mAnim.mPositionType != ASE::Animation::TRACK) {
            ASSIMP_LOG_WARN("ASE: Position controller uses Bezier/TCB keys. "
                            "This is not supported.");
        }
        if ((*i)->mAnim.mRotationType != ASE::Animation::TRACK) {
            ASSIMP_LOG_WARN("ASE: Rotation controller uses Bezier/TCB keys. "
                            "This is not supported.");
        }
        if ((*i)->mAnim.mScalingType != ASE::Animation::TRACK) {
            ASSIMP_LOG_WARN("ASE: Position controller uses Bezier/TCB keys. "
                            "This is not supported.");
        }

        // We compare against 1 here - firstly one key is not
        // really an animation and secondly MAX writes dummies
        // that represent the node transformation.
        if ((*i)->mAnim.akeyPositions.size() > 1 || (*i)->mAnim.akeyRotations.size() > 1 || (*i)->mAnim.akeyScaling.size() > 1) {
            ++iNum;
        }
        if ((*i)->mTargetAnim.akeyPositions.size() > 1 && is_not_qnan((*i)->mTargetPosition.x)) {
            ++iNum;
        }
    }
    if (iNum) {
        // Generate a new animation channel and setup everything for it
        pcScene->mNumAnimations = 1;
        pcScene->mAnimations = new aiAnimation *[1];
        aiAnimation *pcAnim = pcScene->mAnimations[0] = new aiAnimation();
        pcAnim->mNumChannels = iNum;
        pcAnim->mChannels = new aiNodeAnim *[iNum];
        pcAnim->mTicksPerSecond = mParser->iFrameSpeed * mParser->iTicksPerFrame;

        iNum = 0;

        // Now iterate through all meshes and collect all data we can find
        for (i = nodes.begin(); i != nodes.end(); ++i) {

            ASE::BaseNode *me = *i;
            if (me->mTargetAnim.akeyPositions.size() > 1 && is_not_qnan(me->mTargetPosition.x)) {
                // Generate an extra channel for the camera/light target.
                // BuildNodes() does also generate an extra node, named
                // <baseName>.Target.
                aiNodeAnim *nd = pcAnim->mChannels[iNum++] = new aiNodeAnim();
                nd->mNodeName.Set(me->mName + ".Target");

                // If there is no input position channel we will need
                // to supply the default position from the node's
                // local transformation matrix.
                /*TargetAnimationHelper helper;
                if (me->mAnim.akeyPositions.empty())
                {
                    aiMatrix4x4& mat = (*i)->mTransform;
                    helper.SetFixedMainAnimationChannel(aiVector3D(
                        mat.a4, mat.b4, mat.c4));
                }
                else helper.SetMainAnimationChannel (&me->mAnim.akeyPositions);
                helper.SetTargetAnimationChannel (&me->mTargetAnim.akeyPositions);

                helper.Process(&me->mTargetAnim.akeyPositions);*/

                // Allocate the key array and fill it
                nd->mNumPositionKeys = (unsigned int)me->mTargetAnim.akeyPositions.size();
                nd->mPositionKeys = new aiVectorKey[nd->mNumPositionKeys];

                ::memcpy(nd->mPositionKeys, &me->mTargetAnim.akeyPositions[0],
                        nd->mNumPositionKeys * sizeof(aiVectorKey));
            }

            if (me->mAnim.akeyPositions.size() > 1 || me->mAnim.akeyRotations.size() > 1 || me->mAnim.akeyScaling.size() > 1) {
                // Begin a new node animation channel for this node
                aiNodeAnim *nd = pcAnim->mChannels[iNum++] = new aiNodeAnim();
                nd->mNodeName.Set(me->mName);

                // copy position keys
                if (me->mAnim.akeyPositions.size() > 1) {
                    // Allocate the key array and fill it
                    nd->mNumPositionKeys = (unsigned int)me->mAnim.akeyPositions.size();
                    nd->mPositionKeys = new aiVectorKey[nd->mNumPositionKeys];

                    ::memcpy(nd->mPositionKeys, &me->mAnim.akeyPositions[0],
                            nd->mNumPositionKeys * sizeof(aiVectorKey));
                }
                // copy rotation keys
                if (me->mAnim.akeyRotations.size() > 1) {
                    // Allocate the key array and fill it
                    nd->mNumRotationKeys = (unsigned int)me->mAnim.akeyRotations.size();
                    nd->mRotationKeys = new aiQuatKey[nd->mNumRotationKeys];

                    // --------------------------------------------------------------------
                    // Rotation keys are offsets to the previous keys.
                    // We have the quaternion representations of all
                    // of them, so we just need to concatenate all
                    // (unit-length) quaternions to get the absolute
                    // rotations.
                    // Rotation keys are ABSOLUTE for older files
                    // --------------------------------------------------------------------

                    aiQuaternion cur;
                    for (unsigned int a = 0; a < nd->mNumRotationKeys; ++a) {
                        aiQuatKey q = me->mAnim.akeyRotations[a];

                        if (mParser->iFileFormat > 110) {
                            cur = (a ? cur * q.mValue : q.mValue);
                            q.mValue = cur.Normalize();
                        }
                        nd->mRotationKeys[a] = q;

                        // need this to get to Assimp quaternion conventions
                        nd->mRotationKeys[a].mValue.w *= -1.f;
                    }
                }
                // copy scaling keys
                if (me->mAnim.akeyScaling.size() > 1) {
                    // Allocate the key array and fill it
                    nd->mNumScalingKeys = (unsigned int)me->mAnim.akeyScaling.size();
                    nd->mScalingKeys = new aiVectorKey[nd->mNumScalingKeys];

                    ::memcpy(nd->mScalingKeys, &me->mAnim.akeyScaling[0],
                            nd->mNumScalingKeys * sizeof(aiVectorKey));
                }
            }
        }
    }
}

// ------------------------------------------------------------------------------------------------
// Build output cameras
void ASEImporter::BuildCameras() {
    if (!mParser->m_vCameras.empty()) {
        pcScene->mNumCameras = (unsigned int)mParser->m_vCameras.size();
        pcScene->mCameras = new aiCamera *[pcScene->mNumCameras];

        for (unsigned int i = 0; i < pcScene->mNumCameras; ++i) {
            aiCamera *out = pcScene->mCameras[i] = new aiCamera();
            ASE::Camera &in = mParser->m_vCameras[i];

            // copy members
            out->mClipPlaneFar = in.mFar;
            out->mClipPlaneNear = (in.mNear ? in.mNear : 0.1f);
            out->mHorizontalFOV = in.mFOV;

            out->mName.Set(in.mName);
        }
    }
}

// ------------------------------------------------------------------------------------------------
// Build output lights
void ASEImporter::BuildLights() {
    if (!mParser->m_vLights.empty()) {
        pcScene->mNumLights = (unsigned int)mParser->m_vLights.size();
        pcScene->mLights = new aiLight *[pcScene->mNumLights];

        for (unsigned int i = 0; i < pcScene->mNumLights; ++i) {
            aiLight *out = pcScene->mLights[i] = new aiLight();
            ASE::Light &in = mParser->m_vLights[i];

            // The direction is encoded in the transformation matrix of the node.
            // In 3DS MAX the light source points into negative Z direction if
            // the node transformation is the identity.
            out->mDirection = aiVector3D(0.f, 0.f, -1.f);

            out->mName.Set(in.mName);
            switch (in.mLightType) {
            case ASE::Light::TARGET:
                out->mType = aiLightSource_SPOT;
                out->mAngleInnerCone = AI_DEG_TO_RAD(in.mAngle);
                out->mAngleOuterCone = (in.mFalloff ? AI_DEG_TO_RAD(in.mFalloff) : out->mAngleInnerCone);
                break;

            case ASE::Light::DIRECTIONAL:
                out->mType = aiLightSource_DIRECTIONAL;
                break;

            default:
                //case ASE::Light::OMNI:
                out->mType = aiLightSource_POINT;
                break;
            };
            out->mColorDiffuse = out->mColorSpecular = in.mColor * in.mIntensity;
        }
    }
}

// ------------------------------------------------------------------------------------------------
void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes,
        aiNode *pcParent, const char *szName) {
    aiMatrix4x4 m;
    AddNodes(nodes, pcParent, szName, m);
}

// ------------------------------------------------------------------------------------------------
// Add meshes to a given node
void ASEImporter::AddMeshes(const ASE::BaseNode *snode, aiNode *node) {
    for (unsigned int i = 0; i < pcScene->mNumMeshes; ++i) {
        // Get the name of the mesh (the mesh instance has been temporarily stored in the third vertex color)
        const aiMesh *pcMesh = pcScene->mMeshes[i];
        const ASE::Mesh *mesh = (const ASE::Mesh *)pcMesh->mColors[2];

        if (mesh == snode) {
            ++node->mNumMeshes;
        }
    }

    if (node->mNumMeshes) {
        node->mMeshes = new unsigned int[node->mNumMeshes];
        for (unsigned int i = 0, p = 0; i < pcScene->mNumMeshes; ++i) {

            const aiMesh *pcMesh = pcScene->mMeshes[i];
            const ASE::Mesh *mesh = (const ASE::Mesh *)pcMesh->mColors[2];
            if (mesh == snode) {
                node->mMeshes[p++] = i;

                // Transform all vertices of the mesh back into their local space ->
                // at the moment they are pretransformed
                aiMatrix4x4 m = mesh->mTransform;
                m.Inverse();

                aiVector3D *pvCurPtr = pcMesh->mVertices;
                const aiVector3D *pvEndPtr = pvCurPtr + pcMesh->mNumVertices;
                while (pvCurPtr != pvEndPtr) {
                    *pvCurPtr = m * (*pvCurPtr);
                    pvCurPtr++;
                }

                // Do the same for the normal vectors, if we have them.
                // As always, inverse transpose.
                if (pcMesh->mNormals) {
                    aiMatrix3x3 m3 = aiMatrix3x3(mesh->mTransform);
                    m3.Transpose();

                    pvCurPtr = pcMesh->mNormals;
                    pvEndPtr = pvCurPtr + pcMesh->mNumVertices;
                    while (pvCurPtr != pvEndPtr) {
                        *pvCurPtr = m3 * (*pvCurPtr);
                        pvCurPtr++;
                    }
                }
            }
        }
    }
}

// ------------------------------------------------------------------------------------------------
// Add child nodes to a given parent node
void ASEImporter::AddNodes(const std::vector<BaseNode *> &nodes,
        aiNode *pcParent, const char *szName,
        const aiMatrix4x4 &mat) {
    const size_t len = szName ? ::strlen(szName) : 0;
    ai_assert(4 <= AI_MAX_NUMBER_OF_COLOR_SETS);

    // Receives child nodes for the pcParent node
    std::vector<aiNode *> apcNodes;

    // Now iterate through all nodes in the scene and search for one
    // which has *us* as parent.
    for (std::vector<BaseNode *>::const_iterator it = nodes.begin(), end = nodes.end(); it != end; ++it) {
        const BaseNode *snode = *it;
        if (szName) {
            if (len != snode->mParent.length() || ::strcmp(szName, snode->mParent.c_str()))
                continue;
        } else if (snode->mParent.length())
            continue;

        (*it)->mProcessed = true;

        // Allocate a new node and add it to the output data structure
        apcNodes.push_back(new aiNode());
        aiNode *node = apcNodes.back();

        node->mName.Set((snode->mName.length() ? snode->mName.c_str() : "Unnamed_Node"));
        node->mParent = pcParent;

        // Setup the transformation matrix of the node
        aiMatrix4x4 mParentAdjust = mat;
        mParentAdjust.Inverse();
        node->mTransformation = mParentAdjust * snode->mTransform;

        // Add sub nodes - prevent stack overflow due to recursive parenting
        if (node->mName != node->mParent->mName && node->mName != node->mParent->mParent->mName) {
            AddNodes(nodes, node, node->mName.data, snode->mTransform);
        }

        // Further processing depends on the type of the node
        if (snode->mType == ASE::BaseNode::Mesh) {
            // If the type of this node is "Mesh" we need to search
            // the list of output meshes in the data structure for
            // all those that belonged to this node once. This is
            // slightly inconvinient here and a better solution should
            // be used when this code is refactored next.
            AddMeshes(snode, node);
        } else if (is_not_qnan(snode->mTargetPosition.x)) {
            // If this is a target camera or light we generate a small
            // child node which marks the position of the camera
            // target (the direction information is contained in *this*
            // node's animation track but the exact target position
            // would be lost otherwise)
            if (!node->mNumChildren) {
                node->mChildren = new aiNode *[1];
            }

            aiNode *nd = new aiNode();

            nd->mName.Set(snode->mName + ".Target");

            nd->mTransformation.a4 = snode->mTargetPosition.x - snode->mTransform.a4;
            nd->mTransformation.b4 = snode->mTargetPosition.y - snode->mTransform.b4;
            nd->mTransformation.c4 = snode->mTargetPosition.z - snode->mTransform.c4;

            nd->mParent = node;

            // The .Target node is always the first child node
            for (unsigned int m = 0; m < node->mNumChildren; ++m)
                node->mChildren[m + 1] = node->mChildren[m];

            node->mChildren[0] = nd;
            node->mNumChildren++;

            // What we did is so great, it is at least worth a debug message
            ASSIMP_LOG_DEBUG("ASE: Generating separate target node (" + snode->mName + ")");
        }
    }

    // Allocate enough space for the child nodes
    // We allocate one slot more  in case this is a target camera/light
    pcParent->mNumChildren = (unsigned int)apcNodes.size();
    if (pcParent->mNumChildren) {
        pcParent->mChildren = new aiNode *[apcNodes.size() + 1 /* PLUS ONE !!! */];

        // now build all nodes for our nice new children
        for (unsigned int p = 0; p < apcNodes.size(); ++p)
            pcParent->mChildren[p] = apcNodes[p];
    }
    return;
}

// ------------------------------------------------------------------------------------------------
// Build the output node graph
void ASEImporter::BuildNodes(std::vector<BaseNode *> &nodes) {
    ai_assert(nullptr != pcScene);

    // allocate the one and only root node
    aiNode *root = pcScene->mRootNode = new aiNode();
    root->mName.Set("<ASERoot>");

    // Setup the coordinate system transformation
    pcScene->mRootNode->mNumChildren = 1;
    pcScene->mRootNode->mChildren = new aiNode *[1];
    aiNode *ch = pcScene->mRootNode->mChildren[0] = new aiNode();
    ch->mParent = root;

    // Change the transformation matrix of all nodes
    for (BaseNode *node : nodes) {
        aiMatrix4x4 &m = node->mTransform;
        m.Transpose(); // row-order vs column-order
    }

    // add all nodes
    AddNodes(nodes, ch, nullptr);

    // now iterate through al nodes and find those that have not yet
    // been added to the nodegraph (= their parent could not be recognized)
    std::vector<const BaseNode *> aiList;
    for (std::vector<BaseNode *>::iterator it = nodes.begin(), end = nodes.end(); it != end; ++it) {
        if ((*it)->mProcessed) {
            continue;
        }

        // check whether our parent is known
        bool bKnowParent = false;

        // search the list another time, starting *here* and try to find out whether
        // there is a node that references *us* as a parent
        for (std::vector<BaseNode *>::const_iterator it2 = nodes.begin(); it2 != end; ++it2) {
            if (it2 == it) {
                continue;
            }

            if ((*it2)->mName == (*it)->mParent) {
                bKnowParent = true;
                break;
            }
        }
        if (!bKnowParent) {
            aiList.push_back(*it);
        }
    }

    // Are there ane orphaned nodes?
    if (!aiList.empty()) {
        std::vector<aiNode *> apcNodes;
        apcNodes.reserve(aiList.size() + pcScene->mRootNode->mNumChildren);

        for (unsigned int i = 0; i < pcScene->mRootNode->mNumChildren; ++i)
            apcNodes.push_back(pcScene->mRootNode->mChildren[i]);

        delete[] pcScene->mRootNode->mChildren;
        for (std::vector<const BaseNode *>::/*const_*/ iterator i = aiList.begin(); i != aiList.end(); ++i) {
            const ASE::BaseNode *src = *i;

            // The parent is not known, so we can assume that we must add
            // this node to the root node of the whole scene
            aiNode *pcNode = new aiNode();
            pcNode->mParent = pcScene->mRootNode;
            pcNode->mName.Set(src->mName);
            AddMeshes(src, pcNode);
            AddNodes(nodes, pcNode, pcNode->mName.data);
            apcNodes.push_back(pcNode);
        }

        // Regenerate our output array
        pcScene->mRootNode->mChildren = new aiNode *[apcNodes.size()];
        for (unsigned int i = 0; i < apcNodes.size(); ++i)
            pcScene->mRootNode->mChildren[i] = apcNodes[i];

        pcScene->mRootNode->mNumChildren = (unsigned int)apcNodes.size();
    }

    // Reset the third color set to nullptr - we used this field to store a temporary pointer
    for (unsigned int i = 0; i < pcScene->mNumMeshes; ++i)
        pcScene->mMeshes[i]->mColors[2] = nullptr;

    // The root node should not have at least one child or the file is valid
    if (!pcScene->mRootNode->mNumChildren) {
        throw DeadlyImportError("ASE: No nodes loaded. The file is either empty or corrupt");
    }

    // Now rotate the whole scene 90 degrees around the x axis to convert to internal coordinate system
    pcScene->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);
}

// ------------------------------------------------------------------------------------------------
// Convert the imported data to the internal verbose representation
void ASEImporter::BuildUniqueRepresentation(ASE::Mesh &mesh) {
    // allocate output storage
    std::vector<aiVector3D> mPositions;
    std::vector<aiVector3D> amTexCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
    std::vector<aiColor4D> mVertexColors;
    std::vector<aiVector3D> mNormals;
    std::vector<BoneVertex> mBoneVertices;

    unsigned int iSize = (unsigned int)mesh.mFaces.size() * 3;
    mPositions.resize(iSize);

    // optional texture coordinates
    for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
        if (!mesh.amTexCoords[i].empty()) {
            amTexCoords[i].resize(iSize);
        }
    }
    // optional vertex colors
    if (!mesh.mVertexColors.empty()) {
        mVertexColors.resize(iSize);
    }

    // optional vertex normals (vertex normals can simply be copied)
    if (!mesh.mNormals.empty()) {
        mNormals.resize(iSize);
    }
    // bone vertices. There is no need to change the bone list
    if (!mesh.mBoneVertices.empty()) {
        mBoneVertices.resize(iSize);
    }

    // iterate through all faces in the mesh
    unsigned int iCurrent = 0, fi = 0;
    for (std::vector<ASE::Face>::iterator i = mesh.mFaces.begin(); i != mesh.mFaces.end(); ++i, ++fi) {
        for (unsigned int n = 0; n < 3; ++n, ++iCurrent) {
            mPositions[iCurrent] = mesh.mPositions[(*i).mIndices[n]];

            // add texture coordinates
            for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++c) {
                if (mesh.amTexCoords[c].empty()) break;
                amTexCoords[c][iCurrent] = mesh.amTexCoords[c][(*i).amUVIndices[c][n]];
            }
            // add vertex colors
            if (!mesh.mVertexColors.empty()) {
                mVertexColors[iCurrent] = mesh.mVertexColors[(*i).mColorIndices[n]];
            }
            // add normal vectors
            if (!mesh.mNormals.empty()) {
                mNormals[iCurrent] = mesh.mNormals[fi * 3 + n];
                mNormals[iCurrent].Normalize();
            }

            // handle bone vertices
            if ((*i).mIndices[n] < mesh.mBoneVertices.size()) {
                // (sometimes this will cause bone verts to be duplicated
                //  however, I' quite sure Schrompf' JoinVerticesStep
                //  will fix that again ...)
                mBoneVertices[iCurrent] = mesh.mBoneVertices[(*i).mIndices[n]];
            }
            (*i).mIndices[n] = iCurrent;
        }
    }

    // replace the old arrays
    mesh.mNormals = mNormals;
    mesh.mPositions = mPositions;
    mesh.mVertexColors = mVertexColors;

    for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++c)
        mesh.amTexCoords[c] = amTexCoords[c];
}

// ------------------------------------------------------------------------------------------------
// Copy a texture from the ASE structs to the output material
void CopyASETexture(aiMaterial &mat, ASE::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 texture UV transformations
    mat.AddProperty<ai_real>(&texture.mOffsetU, 5, AI_MATKEY_UVTRANSFORM(type, 0));
}

// ------------------------------------------------------------------------------------------------
// Convert from ASE material to output material
void ASEImporter::ConvertMaterial(ASE::Material &mat) {
    // LARGE TODO: Much code her is copied from 3DS ... join them maybe?

    // Allocate the output material
    mat.pcInstance = new aiMaterial();

    // At first add the base ambient color of the
    // scene to the material
    mat.mAmbient.r += mParser->m_clrAmbient.r;
    mat.mAmbient.g += mParser->m_clrAmbient.g;
    mat.mAmbient.b += mParser->m_clrAmbient.b;

    aiString name;
    name.Set(mat.mName);
    mat.pcInstance->AddProperty(&name, AI_MATKEY_NAME);

    // material colors
    mat.pcInstance->AddProperty(&mat.mAmbient, 1, AI_MATKEY_COLOR_AMBIENT);
    mat.pcInstance->AddProperty(&mat.mDiffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
    mat.pcInstance->AddProperty(&mat.mSpecular, 1, AI_MATKEY_COLOR_SPECULAR);
    mat.pcInstance->AddProperty(&mat.mEmissive, 1, AI_MATKEY_COLOR_EMISSIVE);

    // shininess
    if (0.0f != mat.mSpecularExponent && 0.0f != mat.mShininessStrength) {
        mat.pcInstance->AddProperty(&mat.mSpecularExponent, 1, AI_MATKEY_SHININESS);
        mat.pcInstance->AddProperty(&mat.mShininessStrength, 1, AI_MATKEY_SHININESS_STRENGTH);
    }
    // If there is no shininess, we can disable phong lighting
    else if (D3DS::Discreet3DS::Metal == mat.mShading ||
             D3DS::Discreet3DS::Phong == mat.mShading ||
             D3DS::Discreet3DS::Blinn == mat.mShading) {
        mat.mShading = D3DS::Discreet3DS::Gouraud;
    }

    // opacity
    mat.pcInstance->AddProperty<ai_real>(&mat.mTransparency, 1, AI_MATKEY_OPACITY);

    // Two sided rendering?
    if (mat.mTwoSided) {
        int i = 1;
        mat.pcInstance->AddProperty<int>(&i, 1, AI_MATKEY_TWOSIDED);
    }

    // shading mode
    aiShadingMode eShading = aiShadingMode_NoShading;
    switch (mat.mShading) {
    case D3DS::Discreet3DS::Flat:
        eShading = aiShadingMode_Flat;
        break;
    case D3DS::Discreet3DS::Phong:
        eShading = aiShadingMode_Phong;
        break;
    case D3DS::Discreet3DS::Blinn:
        eShading = aiShadingMode_Blinn;
        break;

        // I don't know what "Wire" shading should be,
        // assume it is simple lambertian diffuse (L dot N) shading
    case D3DS::Discreet3DS::Wire: {
        // set the wireframe flag
        unsigned int iWire = 1;
        mat.pcInstance->AddProperty<int>((int *)&iWire, 1, AI_MATKEY_ENABLE_WIREFRAME);
    }
    case D3DS::Discreet3DS::Gouraud:
        eShading = aiShadingMode_Gouraud;
        break;
    case D3DS::Discreet3DS::Metal:
        eShading = aiShadingMode_CookTorrance;
        break;
    }
    mat.pcInstance->AddProperty<int>((int *)&eShading, 1, AI_MATKEY_SHADING_MODEL);

    // DIFFUSE texture
    if (mat.sTexDiffuse.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexDiffuse, aiTextureType_DIFFUSE);

    // SPECULAR texture
    if (mat.sTexSpecular.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexSpecular, aiTextureType_SPECULAR);

    // AMBIENT texture
    if (mat.sTexAmbient.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexAmbient, aiTextureType_AMBIENT);

    // OPACITY texture
    if (mat.sTexOpacity.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexOpacity, aiTextureType_OPACITY);

    // EMISSIVE texture
    if (mat.sTexEmissive.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexEmissive, aiTextureType_EMISSIVE);

    // BUMP texture
    if (mat.sTexBump.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexBump, aiTextureType_HEIGHT);

    // SHININESS texture
    if (mat.sTexShininess.mMapName.length() > 0)
        CopyASETexture(*mat.pcInstance, mat.sTexShininess, aiTextureType_SHININESS);

    // store the name of the material itself, too
    if (mat.mName.length() > 0) {
        aiString tex;
        tex.Set(mat.mName);
        mat.pcInstance->AddProperty(&tex, AI_MATKEY_NAME);
    }
    return;
}

// ------------------------------------------------------------------------------------------------
// Build output meshes
void ASEImporter::ConvertMeshes(ASE::Mesh &mesh, std::vector<aiMesh *> &avOutMeshes) {
    // validate the material index of the mesh
    if (mesh.iMaterialIndex >= mParser->m_vMaterials.size()) {
        mesh.iMaterialIndex = (unsigned int)mParser->m_vMaterials.size() - 1;
        ASSIMP_LOG_WARN("Material index is out of range");
    }

    // If the material the mesh is assigned to is consisting of submeshes, split it
    if (!mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials.empty()) {
        std::vector<ASE::Material> vSubMaterials = mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials;

        std::vector<unsigned int> *aiSplit = new std::vector<unsigned int>[vSubMaterials.size()];

        // build a list of all faces per sub-material
        for (unsigned int i = 0; i < mesh.mFaces.size(); ++i) {
            // check range
            if (mesh.mFaces[i].iMaterial >= vSubMaterials.size()) {
                ASSIMP_LOG_WARN("Submaterial index is out of range");

                // use the last material instead
                aiSplit[vSubMaterials.size() - 1].push_back(i);
            } else
                aiSplit[mesh.mFaces[i].iMaterial].push_back(i);
        }

        // now generate submeshes
        for (unsigned int p = 0; p < vSubMaterials.size(); ++p) {
            if (!aiSplit[p].empty()) {

                aiMesh *p_pcOut = new aiMesh();
                p_pcOut->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

                // let the sub material index
                p_pcOut->mMaterialIndex = p;

                // we will need this material
                mParser->m_vMaterials[mesh.iMaterialIndex].avSubMaterials[p].bNeed = true;

                // store the real index here ... color channel 3
                p_pcOut->mColors[3] = (aiColor4D *)(uintptr_t)mesh.iMaterialIndex;

                // store a pointer to the mesh in color channel 2
                p_pcOut->mColors[2] = (aiColor4D *)&mesh;
                avOutMeshes.push_back(p_pcOut);

                // convert vertices
                p_pcOut->mNumVertices = (unsigned int)aiSplit[p].size() * 3;
                p_pcOut->mNumFaces = (unsigned int)aiSplit[p].size();

                // receive output vertex weights
                std::vector<std::pair<unsigned int, float>> *avOutputBones = nullptr;
                if (!mesh.mBones.empty()) {
                    avOutputBones = new std::vector<std::pair<unsigned int, float>>[mesh.mBones.size()];
                }

                // allocate enough storage for faces
                p_pcOut->mFaces = new aiFace[p_pcOut->mNumFaces];

                unsigned int iBase = 0, iIndex;
                if (p_pcOut->mNumVertices) {
                    p_pcOut->mVertices = new aiVector3D[p_pcOut->mNumVertices];
                    p_pcOut->mNormals = new aiVector3D[p_pcOut->mNumVertices];
                    for (unsigned int q = 0; q < aiSplit[p].size(); ++q) {

                        iIndex = aiSplit[p][q];

                        p_pcOut->mFaces[q].mIndices = new unsigned int[3];
                        p_pcOut->mFaces[q].mNumIndices = 3;

                        for (unsigned int t = 0; t < 3; ++t, ++iBase) {
                            const uint32_t iIndex2 = mesh.mFaces[iIndex].mIndices[t];

                            p_pcOut->mVertices[iBase] = mesh.mPositions[iIndex2];
                            p_pcOut->mNormals[iBase] = mesh.mNormals[iIndex2];

                            // convert bones, if existing
                            if (!mesh.mBones.empty()) {
                                ai_assert(avOutputBones);
                                // check whether there is a vertex weight for this vertex index
                                if (iIndex2 < mesh.mBoneVertices.size()) {

                                    for (std::vector<std::pair<int, float>>::const_iterator
                                                    blubb = mesh.mBoneVertices[iIndex2].mBoneWeights.begin();
                                            blubb != mesh.mBoneVertices[iIndex2].mBoneWeights.end(); ++blubb) {

                                        // NOTE: illegal cases have already been filtered out
                                        avOutputBones[(*blubb).first].push_back(std::pair<unsigned int, float>(
                                                iBase, (*blubb).second));
                                    }
                                }
                            }
                            p_pcOut->mFaces[q].mIndices[t] = iBase;
                        }
                    }
                }
                // convert texture coordinates (up to AI_MAX_NUMBER_OF_TEXTURECOORDS sets supported)
                for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++c) {
                    if (!mesh.amTexCoords[c].empty()) {
                        p_pcOut->mTextureCoords[c] = new aiVector3D[p_pcOut->mNumVertices];
                        iBase = 0;
                        for (unsigned int q = 0; q < aiSplit[p].size(); ++q) {
                            iIndex = aiSplit[p][q];
                            for (unsigned int t = 0; t < 3; ++t) {
                                p_pcOut->mTextureCoords[c][iBase++] = mesh.amTexCoords[c][mesh.mFaces[iIndex].mIndices[t]];
                            }
                        }
                        // Setup the number of valid vertex components
                        p_pcOut->mNumUVComponents[c] = mesh.mNumUVComponents[c];
                    }
                }

                // Convert vertex colors (only one set supported)
                if (!mesh.mVertexColors.empty()) {
                    p_pcOut->mColors[0] = new aiColor4D[p_pcOut->mNumVertices];
                    iBase = 0;
                    for (unsigned int q = 0; q < aiSplit[p].size(); ++q) {
                        iIndex = aiSplit[p][q];
                        for (unsigned int t = 0; t < 3; ++t) {
                            p_pcOut->mColors[0][iBase++] = mesh.mVertexColors[mesh.mFaces[iIndex].mIndices[t]];
                        }
                    }
                }
                // Copy bones
                if (!mesh.mBones.empty()) {
                    p_pcOut->mNumBones = 0;
                    for (unsigned int mrspock = 0; mrspock < mesh.mBones.size(); ++mrspock)
                        if (!avOutputBones[mrspock].empty()) p_pcOut->mNumBones++;

                    p_pcOut->mBones = new aiBone *[p_pcOut->mNumBones];
                    aiBone **pcBone = p_pcOut->mBones;
                    for (unsigned int mrspock = 0; mrspock < mesh.mBones.size(); ++mrspock) {
                        if (!avOutputBones[mrspock].empty()) {
                            // we will need this bone. add it to the output mesh and
                            // add all per-vertex weights
                            aiBone *pc = *pcBone = new aiBone();
                            pc->mName.Set(mesh.mBones[mrspock].mName);

                            pc->mNumWeights = (unsigned int)avOutputBones[mrspock].size();
                            pc->mWeights = new aiVertexWeight[pc->mNumWeights];

                            for (unsigned int captainkirk = 0; captainkirk < pc->mNumWeights; ++captainkirk) {
                                const std::pair<unsigned int, float> &ref = avOutputBones[mrspock][captainkirk];
                                pc->mWeights[captainkirk].mVertexId = ref.first;
                                pc->mWeights[captainkirk].mWeight = ref.second;
                            }
                            ++pcBone;
                        }
                    }
                    // delete allocated storage
                    delete[] avOutputBones;
                }
            }
        }
        // delete storage
        delete[] aiSplit;
    } else {
        // Otherwise we can simply copy the data to one output mesh
        // This codepath needs less memory and uses fast memcpy()s
        // to do the actual copying. So I think it is worth the
        // effort here.

        aiMesh *p_pcOut = new aiMesh();
        p_pcOut->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

        // set an empty sub material index
        p_pcOut->mMaterialIndex = ASE::Face::DEFAULT_MATINDEX;
        mParser->m_vMaterials[mesh.iMaterialIndex].bNeed = true;

        // store the real index here ... in color channel 3
        p_pcOut->mColors[3] = (aiColor4D *)(uintptr_t)mesh.iMaterialIndex;

        // store a pointer to the mesh in color channel 2
        p_pcOut->mColors[2] = (aiColor4D *)&mesh;
        avOutMeshes.push_back(p_pcOut);

        // If the mesh hasn't faces or vertices, there are two cases
        // possible: 1. the model is invalid. 2. This is a dummy
        // helper object which we are going to remove later ...
        if (mesh.mFaces.empty() || mesh.mPositions.empty()) {
            return;
        }

        // convert vertices
        p_pcOut->mNumVertices = (unsigned int)mesh.mPositions.size();
        p_pcOut->mNumFaces = (unsigned int)mesh.mFaces.size();

        // allocate enough storage for faces
        p_pcOut->mFaces = new aiFace[p_pcOut->mNumFaces];

        // copy vertices
        p_pcOut->mVertices = new aiVector3D[mesh.mPositions.size()];
        memcpy(p_pcOut->mVertices, &mesh.mPositions[0],
                mesh.mPositions.size() * sizeof(aiVector3D));

        // copy normals
        p_pcOut->mNormals = new aiVector3D[mesh.mNormals.size()];
        memcpy(p_pcOut->mNormals, &mesh.mNormals[0],
                mesh.mNormals.size() * sizeof(aiVector3D));

        // copy texture coordinates
        for (unsigned int c = 0; c < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++c) {
            if (!mesh.amTexCoords[c].empty()) {
                p_pcOut->mTextureCoords[c] = new aiVector3D[mesh.amTexCoords[c].size()];
                memcpy(p_pcOut->mTextureCoords[c], &mesh.amTexCoords[c][0],
                        mesh.amTexCoords[c].size() * sizeof(aiVector3D));

                // setup the number of valid vertex components
                p_pcOut->mNumUVComponents[c] = mesh.mNumUVComponents[c];
            }
        }

        // copy vertex colors
        if (!mesh.mVertexColors.empty()) {
            p_pcOut->mColors[0] = new aiColor4D[mesh.mVertexColors.size()];
            memcpy(p_pcOut->mColors[0], &mesh.mVertexColors[0],
                    mesh.mVertexColors.size() * sizeof(aiColor4D));
        }

        // copy faces
        for (unsigned int iFace = 0; iFace < p_pcOut->mNumFaces; ++iFace) {
            p_pcOut->mFaces[iFace].mNumIndices = 3;
            p_pcOut->mFaces[iFace].mIndices = new unsigned int[3];

            // copy indices
            p_pcOut->mFaces[iFace].mIndices[0] = mesh.mFaces[iFace].mIndices[0];
            p_pcOut->mFaces[iFace].mIndices[1] = mesh.mFaces[iFace].mIndices[1];
            p_pcOut->mFaces[iFace].mIndices[2] = mesh.mFaces[iFace].mIndices[2];
        }

        // copy vertex bones
        if (!mesh.mBones.empty() && !mesh.mBoneVertices.empty()) {
            std::vector<std::vector<aiVertexWeight>> avBonesOut(mesh.mBones.size());

            // find all vertex weights for this bone
            unsigned int quak = 0;
            for (std::vector<BoneVertex>::const_iterator harrypotter = mesh.mBoneVertices.begin();
                    harrypotter != mesh.mBoneVertices.end(); ++harrypotter, ++quak) {

                for (std::vector<std::pair<int, float>>::const_iterator
                                ronaldweasley = (*harrypotter).mBoneWeights.begin();
                        ronaldweasley != (*harrypotter).mBoneWeights.end(); ++ronaldweasley) {
                    aiVertexWeight weight;
                    weight.mVertexId = quak;
                    weight.mWeight = (*ronaldweasley).second;
                    avBonesOut[(*ronaldweasley).first].push_back(weight);
                }
            }

            // now build a final bone list
            p_pcOut->mNumBones = 0;
            for (unsigned int jfkennedy = 0; jfkennedy < mesh.mBones.size(); ++jfkennedy)
                if (!avBonesOut[jfkennedy].empty()) p_pcOut->mNumBones++;

            p_pcOut->mBones = new aiBone *[p_pcOut->mNumBones];
            aiBone **pcBone = p_pcOut->mBones;
            for (unsigned int jfkennedy = 0; jfkennedy < mesh.mBones.size(); ++jfkennedy) {
                if (!avBonesOut[jfkennedy].empty()) {
                    aiBone *pc = *pcBone = new aiBone();
                    pc->mName.Set(mesh.mBones[jfkennedy].mName);
                    pc->mNumWeights = (unsigned int)avBonesOut[jfkennedy].size();
                    pc->mWeights = new aiVertexWeight[pc->mNumWeights];
                    ::memcpy(pc->mWeights, &avBonesOut[jfkennedy][0],
                            sizeof(aiVertexWeight) * pc->mNumWeights);
                    ++pcBone;
                }
            }
        }
    }
}

// ------------------------------------------------------------------------------------------------
// Setup proper material indices and build output materials
void ASEImporter::BuildMaterialIndices() {
    ai_assert(nullptr != pcScene);

    // iterate through all materials and check whether we need them
    for (unsigned int iMat = 0; iMat < mParser->m_vMaterials.size(); ++iMat) {
        ASE::Material &mat = mParser->m_vMaterials[iMat];
        if (mat.bNeed) {
            // Convert it to the aiMaterial layout
            ConvertMaterial(mat);
            ++pcScene->mNumMaterials;
        }
        for (unsigned int iSubMat = 0; iSubMat < mat.avSubMaterials.size(); ++iSubMat) {
            ASE::Material &submat = mat.avSubMaterials[iSubMat];
            if (submat.bNeed) {
                // Convert it to the aiMaterial layout
                ConvertMaterial(submat);
                ++pcScene->mNumMaterials;
            }
        }
    }

    // allocate the output material array
    pcScene->mMaterials = new aiMaterial *[pcScene->mNumMaterials];
    D3DS::Material **pcIntMaterials = new D3DS::Material *[pcScene->mNumMaterials];

    unsigned int iNum = 0;
    for (unsigned int iMat = 0; iMat < mParser->m_vMaterials.size(); ++iMat) {
        ASE::Material &mat = mParser->m_vMaterials[iMat];
        if (mat.bNeed) {
            ai_assert(nullptr != mat.pcInstance);
            pcScene->mMaterials[iNum] = mat.pcInstance;

            // Store the internal material, too
            pcIntMaterials[iNum] = &mat;

            // Iterate through all meshes and search for one which is using
            // this top-level material index
            for (unsigned int iMesh = 0; iMesh < pcScene->mNumMeshes; ++iMesh) {
                aiMesh *mesh = pcScene->mMeshes[iMesh];
                if (ASE::Face::DEFAULT_MATINDEX == mesh->mMaterialIndex &&
                        iMat == (uintptr_t)mesh->mColors[3]) {
                    mesh->mMaterialIndex = iNum;
                    mesh->mColors[3] = nullptr;
                }
            }
            iNum++;
        }
        for (unsigned int iSubMat = 0; iSubMat < mat.avSubMaterials.size(); ++iSubMat) {
            ASE::Material &submat = mat.avSubMaterials[iSubMat];
            if (submat.bNeed) {
                ai_assert(nullptr != submat.pcInstance);
                pcScene->mMaterials[iNum] = submat.pcInstance;

                // Store the internal material, too
                pcIntMaterials[iNum] = &submat;

                // Iterate through all meshes and search for one which is using
                // this sub-level material index
                for (unsigned int iMesh = 0; iMesh < pcScene->mNumMeshes; ++iMesh) {
                    aiMesh *mesh = pcScene->mMeshes[iMesh];

                    if (iSubMat == mesh->mMaterialIndex && iMat == (uintptr_t)mesh->mColors[3]) {
                        mesh->mMaterialIndex = iNum;
                        mesh->mColors[3] = nullptr;
                    }
                }
                iNum++;
            }
        }
    }

    // Delete our temporary array
    delete[] pcIntMaterials;
}

// ------------------------------------------------------------------------------------------------
// Generate normal vectors basing on smoothing groups
bool ASEImporter::GenerateNormals(ASE::Mesh &mesh) {

    if (!mesh.mNormals.empty() && !configRecomputeNormals) {
        // Check whether there are only uninitialized normals. If there are
        // some, skip all normals from the file and compute them on our own
        for (std::vector<aiVector3D>::const_iterator qq = mesh.mNormals.begin(); qq != mesh.mNormals.end(); ++qq) {
            if ((*qq).x || (*qq).y || (*qq).z) {
                return true;
            }
        }
    }
    // The array is reused.
    ComputeNormalsWithSmoothingsGroups<ASE::Face>(mesh);
    return false;
}

#endif // ASSIMP_BUILD_NO_3DS_IMPORTER

#endif // !! ASSIMP_BUILD_NO_BASE_IMPORTER