/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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* Redistributions of source code must retain the above
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* Redistributions in binary form must reproduce the above
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*/
/// \file   X3DImporter.cpp
/// \brief  X3D-format files importer for Assimp: main algorithm implementation.
/// \date   2015-2016
/// \author smal.root@gmail.com

#ifndef ASSIMP_BUILD_NO_X3D_IMPORTER

#include "X3DImporter.hpp"

#include <assimp/StringUtils.h>
#include <assimp/ParsingUtils.h>
#include <assimp/DefaultIOSystem.h>
#include <assimp/fast_atof.h>

// Header files, stdlib.
#include <iterator>
#include <memory>

namespace Assimp {

/// Constant which holds the importer description
const aiImporterDesc X3DImporter::Description = {
    "Extensible 3D(X3D) Importer",
    "smalcom",
    "",
    "See documentation in source code. Chapter: Limitations.",
    aiImporterFlags_SupportTextFlavour | aiImporterFlags_SupportBinaryFlavour | aiImporterFlags_LimitedSupport | aiImporterFlags_Experimental,
    0,
    0,
    0,
    0,
    "x3d x3db"
};

struct WordIterator {
    using iterator_category = std::input_iterator_tag;
    using value_type = const char *;
    using difference_type = ptrdiff_t;
    using pointer = value_type *;
    using reference = value_type &;

    static const char *whitespace;
    const char *mStart, *mEnd;

    WordIterator(const char *start, const char *end) :
            mStart(start),
            mEnd(end) {
        mStart = start + ::strspn(start, whitespace);
        if (mStart >= mEnd) {
            mStart = 0;
        }
    }
    WordIterator() :
            mStart(0),
            mEnd(0) {}
    WordIterator(const WordIterator &other) :
            mStart(other.mStart),
            mEnd(other.mEnd) {}
    WordIterator &operator=(const WordIterator &other) {
        mStart = other.mStart;
        mEnd = other.mEnd;
        return *this;
    }

    bool operator==(const WordIterator &other) const { return mStart == other.mStart; }

    bool operator!=(const WordIterator &other) const { return mStart != other.mStart; }

    WordIterator &operator++() {
        mStart += strcspn(mStart, whitespace);
        mStart += strspn(mStart, whitespace);
        if (mStart >= mEnd) {
            mStart = 0;
        }
        return *this;
    }
    WordIterator operator++(int) {
        WordIterator result(*this);
        ++(*this);
        return result;
    }
    const char *operator*() const { return mStart; }
};

const char *WordIterator::whitespace = ", \t\r\n";

void skipUnsupportedNode(const std::string &pParentNodeName, XmlNode &node) {
    static const size_t Uns_Skip_Len = 192;
    static const char *Uns_Skip[Uns_Skip_Len] = {
        // CAD geometry component
        "CADAssembly", "CADFace", "CADLayer", "CADPart", "IndexedQuadSet", "QuadSet",
        // Core
        "ROUTE", "ExternProtoDeclare", "ProtoDeclare", "ProtoInstance", "ProtoInterface", "WorldInfo",
        // Distributed interactive simulation (DIS) component
        "DISEntityManager", "DISEntityTypeMapping", "EspduTransform", "ReceiverPdu", "SignalPdu", "TransmitterPdu",
        // Cube map environmental texturing component
        "ComposedCubeMapTexture", "GeneratedCubeMapTexture", "ImageCubeMapTexture",
        // Environmental effects component
        "Background", "Fog", "FogCoordinate", "LocalFog", "TextureBackground",
        // Environmental sensor component
        "ProximitySensor", "TransformSensor", "VisibilitySensor",
        // Followers component
        "ColorChaser", "ColorDamper", "CoordinateChaser", "CoordinateDamper", "OrientationChaser", "OrientationDamper", "PositionChaser", "PositionChaser2D",
        "PositionDamper", "PositionDamper2D", "ScalarChaser", "ScalarDamper", "TexCoordChaser2D", "TexCoordDamper2D",
        // Geospatial component
        "GeoCoordinate", "GeoElevationGrid", "GeoLocation", "GeoLOD", "GeoMetadata", "GeoOrigin", "GeoPositionInterpolator", "GeoProximitySensor",
        "GeoTouchSensor", "GeoTransform", "GeoViewpoint",
        // Humanoid Animation (H-Anim) component
        "HAnimDisplacer", "HAnimHumanoid", "HAnimJoint", "HAnimSegment", "HAnimSite",
        // Interpolation component
        "ColorInterpolator", "CoordinateInterpolator", "CoordinateInterpolator2D", "EaseInEaseOut", "NormalInterpolator", "OrientationInterpolator",
        "PositionInterpolator", "PositionInterpolator2D", "ScalarInterpolator", "SplinePositionInterpolator", "SplinePositionInterpolator2D",
        "SplineScalarInterpolator", "SquadOrientationInterpolator",
        // Key device sensor component
        "KeySensor", "StringSensor",
        // Layering component
        "Layer", "LayerSet", "Viewport",
        // Layout component
        "Layout", "LayoutGroup", "LayoutLayer", "ScreenFontStyle", "ScreenGroup",
        // Navigation component
        "Billboard", "Collision", "LOD", "NavigationInfo", "OrthoViewpoint", "Viewpoint", "ViewpointGroup",
        // Networking component
        "EXPORT", "IMPORT", "Anchor", "LoadSensor",
        // NURBS component
        "Contour2D", "ContourPolyline2D", "CoordinateDouble", "NurbsCurve", "NurbsCurve2D", "NurbsOrientationInterpolator", "NurbsPatchSurface",
        "NurbsPositionInterpolator", "NurbsSet", "NurbsSurfaceInterpolator", "NurbsSweptSurface", "NurbsSwungSurface", "NurbsTextureCoordinate",
        "NurbsTrimmedSurface",
        // Particle systems component
        "BoundedPhysicsModel", "ConeEmitter", "ExplosionEmitter", "ForcePhysicsModel", "ParticleSystem", "PointEmitter", "PolylineEmitter", "SurfaceEmitter",
        "VolumeEmitter", "WindPhysicsModel",
        // Picking component
        "LinePickSensor", "PickableGroup", "PointPickSensor", "PrimitivePickSensor", "VolumePickSensor",
        // Pointing device sensor component
        "CylinderSensor", "PlaneSensor", "SphereSensor", "TouchSensor",
        // Rendering component
        "ClipPlane",
        // Rigid body physics
        "BallJoint", "CollidableOffset", "CollidableShape", "CollisionCollection", "CollisionSensor", "CollisionSpace", "Contact", "DoubleAxisHingeJoint",
        "MotorJoint", "RigidBody", "RigidBodyCollection", "SingleAxisHingeJoint", "SliderJoint", "UniversalJoint",
        // Scripting component
        "Script",
        // Programmable shaders component
        "ComposedShader", "FloatVertexAttribute", "Matrix3VertexAttribute", "Matrix4VertexAttribute", "PackagedShader", "ProgramShader", "ShaderPart",
        "ShaderProgram",
        // Shape component
        "FillProperties", "LineProperties", "TwoSidedMaterial",
        // Sound component
        "AudioClip", "Sound",
        // Text component
        "FontStyle", "Text",
        // Texturing3D Component
        "ComposedTexture3D", "ImageTexture3D", "PixelTexture3D", "TextureCoordinate3D", "TextureCoordinate4D", "TextureTransformMatrix3D", "TextureTransform3D",
        // Texturing component
        "MovieTexture", "MultiTexture", "MultiTextureCoordinate", "MultiTextureTransform", "PixelTexture", "TextureCoordinateGenerator", "TextureProperties",
        // Time component
        "TimeSensor",
        // Event Utilities component
        "BooleanFilter", "BooleanSequencer", "BooleanToggle", "BooleanTrigger", "IntegerSequencer", "IntegerTrigger", "TimeTrigger",
        // Volume rendering component
        "BlendedVolumeStyle", "BoundaryEnhancementVolumeStyle", "CartoonVolumeStyle", "ComposedVolumeStyle", "EdgeEnhancementVolumeStyle", "IsoSurfaceVolumeData",
        "OpacityMapVolumeStyle", "ProjectionVolumeStyle", "SegmentedVolumeData", "ShadedVolumeStyle", "SilhouetteEnhancementVolumeStyle", "ToneMappedVolumeStyle",
        "VolumeData"
    };

    const std::string nn = node.name();
    bool found = false;
    bool close_found = false;

    for (size_t i = 0; i < Uns_Skip_Len; i++) {
        if (nn == Uns_Skip[i]) {
            found = true;
            if (node.empty()) {
                close_found = true;
                break;
            }
        }
    }

    if (!found) throw DeadlyImportError("Unknown node \"" + nn + "\" in " + pParentNodeName + ".");

    LogInfo("Skipping node \"" + nn + "\" in " + pParentNodeName + ".");
}

X3DImporter::X3DImporter() :
        mNodeElementCur(nullptr),
        mScene(nullptr) {
    // empty
}

X3DImporter::~X3DImporter() {
    // Clear() is accounting if data already is deleted. So, just check again if all data is deleted.
    Clear();
}

void X3DImporter::Clear() {
    mNodeElementCur = nullptr;
    // Delete all elements
    if (!NodeElement_List.empty()) {
        for (std::list<X3DNodeElementBase *>::iterator it = NodeElement_List.begin(); it != NodeElement_List.end(); ++it) {
            delete *it;
        }
        NodeElement_List.clear();
    }
}

void X3DImporter::ParseFile(const std::string &file, IOSystem *pIOHandler) {
    ai_assert(nullptr != pIOHandler);

    static const std::string mode = "rb";
    std::unique_ptr<IOStream> fileStream(pIOHandler->Open(file, mode));
    if (!fileStream.get()) {
        throw DeadlyImportError("Failed to open file " + file + ".");
    }

    XmlParser theParser;
    if (!theParser.parse(fileStream.get())) {
        return;
    }

    XmlNode *node = theParser.findNode("X3D");
    if (nullptr == node) {
        return;
    }

    for (auto &currentNode : node->children()) {
        const std::string &currentName = currentNode.name();
        if (currentName == "head") {
            readMetadata(currentNode);
        } else if (currentName == "Scene") {
            readScene(currentNode);
        }
    }
}

bool X3DImporter::CanRead(const std::string &pFile, IOSystem * /*pIOHandler*/, bool checkSig) const {
    if (checkSig) {
        std::string::size_type pos = pFile.find_last_of(".x3d");
        if (pos != std::string::npos) {
            return true;
        }
    }

    return false;
}

void X3DImporter::InternReadFile( const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler ) {
    std::shared_ptr<IOStream> stream(pIOHandler->Open(pFile, "rb"));
    if (!stream) {
        throw DeadlyImportError("Could not open file for reading");
    }
    std::string::size_type slashPos = pFile.find_last_of("\\/");

    pIOHandler->PushDirectory(slashPos == std::string::npos ? std::string() : pFile.substr(0, slashPos + 1));
    ParseFile(pFile, pIOHandler);
    pIOHandler->PopDirectory();

    //
    mScene = pScene;
    pScene->mRootNode = new aiNode(pFile);
    pScene->mRootNode->mParent = nullptr;
    pScene->mFlags |= AI_SCENE_FLAGS_ALLOW_SHARED;

    //search for root node element

    mNodeElementCur = NodeElement_List.front();
    while (mNodeElementCur->Parent != nullptr) {
        mNodeElementCur = mNodeElementCur->Parent;
    }

    { // fill aiScene with objects.
        std::list<aiMesh *> mesh_list;
        std::list<aiMaterial *> mat_list;
        std::list<aiLight *> light_list;

        // create nodes tree
        Postprocess_BuildNode(*mNodeElementCur, *pScene->mRootNode, mesh_list, mat_list, light_list);
        // copy needed data to scene
        if (!mesh_list.empty()) {
            std::list<aiMesh *>::const_iterator it = mesh_list.begin();

            pScene->mNumMeshes = static_cast<unsigned int>(mesh_list.size());
            pScene->mMeshes = new aiMesh *[pScene->mNumMeshes];
            for (size_t i = 0; i < pScene->mNumMeshes; i++)
                pScene->mMeshes[i] = *it++;
        }

        if (!mat_list.empty()) {
            std::list<aiMaterial *>::const_iterator it = mat_list.begin();

            pScene->mNumMaterials = static_cast<unsigned int>(mat_list.size());
            pScene->mMaterials = new aiMaterial *[pScene->mNumMaterials];
            for (size_t i = 0; i < pScene->mNumMaterials; i++)
                pScene->mMaterials[i] = *it++;
        }

        if (!light_list.empty()) {
            std::list<aiLight *>::const_iterator it = light_list.begin();

            pScene->mNumLights = static_cast<unsigned int>(light_list.size());
            pScene->mLights = new aiLight *[pScene->mNumLights];
            for (size_t i = 0; i < pScene->mNumLights; i++)
                pScene->mLights[i] = *it++;
        }
    }

}

const aiImporterDesc *X3DImporter::GetInfo() const {
    return &Description;
}

struct meta_entry {
    std::string name;
    std::string value;
};

void X3DImporter::readMetadata(XmlNode &node) {
    std::vector<meta_entry> metaArray;
    for (auto currentNode : node.children()) {
        const std::string &currentName = currentNode.name();
        if (currentName == "meta") {
            meta_entry entry;
            if (XmlParser::getStdStrAttribute(currentNode, "name", entry.name)) {
                XmlParser::getStdStrAttribute(currentNode, "content", entry.value);
                metaArray.emplace_back(entry);
            }
        }
    }
    mScene->mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(metaArray.size()));
    unsigned int i = 0;
    for (auto currentMeta : metaArray) {
        mScene->mMetaData->Set(i, currentMeta.name, currentMeta.value);
        ++i;
    }
}

void X3DImporter::readScene(XmlNode &node) {
    for (auto currentNode : node.children()) {
        const std::string &currentName = currentNode.name();
        if (currentName == "Viewpoint") {
            readViewpoint(currentNode);
        }
    }
}

void X3DImporter::readViewpoint(XmlNode &node) {
    for (auto currentNode : node.children()) {
        //const std::string &currentName = currentNode.name();
    }
}

void readMetadataBoolean(XmlNode &node, X3DNodeElementBase *parent) {
    std::string val;
    X3DNodeElementMetaBoolean *boolean = nullptr;
    if (XmlParser::getStdStrAttribute(node, "value", val)) {
        std::vector<std::string> values;
        tokenize<std::string>(val, values, " ");
        boolean = new X3DNodeElementMetaBoolean(parent);
        for (size_t i = 0; i < values.size(); ++i) {
            bool current_boolean = false;
            if (values[i] == "true") {
                current_boolean = true;
            }
            boolean->Value.emplace_back(current_boolean);
        }
    }
}

void readMetadataDouble(XmlNode &node, X3DNodeElementBase *parent) {
    std::string val;
    X3DNodeElementMetaDouble *doubleNode = nullptr;
    if (XmlParser::getStdStrAttribute(node, "value", val)) {
        std::vector<std::string> values;
        tokenize<std::string>(val, values, " ");
        doubleNode = new X3DNodeElementMetaDouble(parent);
        for (size_t i = 0; i < values.size(); ++i) {
            double current_double = static_cast<double>(fast_atof(values[i].c_str()));
            doubleNode->Value.emplace_back(current_double);
        }
    }
}

void readMetadataFloat(XmlNode &node, X3DNodeElementBase *parent) {
    std::string val;
    X3DNodeElementMetaFloat *floatNode = nullptr;
    if (XmlParser::getStdStrAttribute(node, "value", val)) {
        std::vector<std::string> values;
        tokenize<std::string>(val, values, " ");
        floatNode = new X3DNodeElementMetaFloat(parent);
        for (size_t i = 0; i < values.size(); ++i) {
            float current_float = static_cast<float>(fast_atof(values[i].c_str()));
            floatNode->Value.emplace_back(current_float);
        }
    }
}

void readMetadataInteger(XmlNode &node, X3DNodeElementBase *parent) {
    std::string val;
    X3DNodeElementMetaInt *intNode = nullptr;
    if (XmlParser::getStdStrAttribute(node, "value", val)) {
        std::vector<std::string> values;
        tokenize<std::string>(val, values, " ");
        intNode = new X3DNodeElementMetaInt(parent);
        for (size_t i = 0; i < values.size(); ++i) {
            int current_int = static_cast<int>(std::atoi(values[i].c_str()));
            intNode->Value.emplace_back(current_int);
        }
    }
}

void readMetadataSet(XmlNode &node, X3DNodeElementBase *parent) {
    std::string val;
    X3DNodeElementMetaSet *setNode = new X3DNodeElementMetaSet(parent);
    if (XmlParser::getStdStrAttribute(node, "name", val)) {
        setNode->Name = val;
    }

    if (XmlParser::getStdStrAttribute(node, "reference", val)) {
        setNode->Reference = val;
    }
}

void readMetadataString(XmlNode &node, X3DNodeElementBase *parent) {
    std::string val;
    X3DNodeElementMetaString *strNode = nullptr;
    if (XmlParser::getStdStrAttribute(node, "value", val)) {
        std::vector<std::string> values;
        tokenize<std::string>(val, values, " ");
        strNode = new X3DNodeElementMetaString(parent);
        for (size_t i = 0; i < values.size(); ++i) {
            strNode->Value.emplace_back(values[i]);
        }
    }
}

void X3DImporter::ParseDirectionalLight(XmlNode &node) {
    std::string def, use;
    float ambientIntensity = 0;
    aiColor3D color(1, 1, 1);
    aiVector3D direction(0, 0, -1);
    bool global = false;
    float intensity = 1;
    bool on = true;
    X3DNodeElementBase *ne = nullptr;

    //MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    XmlParser::getFloatAttribute(node, "ambientIntensity", ambientIntensity);
    //MACRO_ATTRREAD_CHECK_RET("ambientIntensity", ambientIntensity, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("color", color, XML_ReadNode_GetAttrVal_AsCol3f);
    MACRO_ATTRREAD_CHECK_REF("direction", direction, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_RET("global", global, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("intensity", intensity, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("on", on, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_DirectionalLight, ne);
    } else {
        if (on) {
            // create and if needed - define new geometry object.
            ne = new X3DNodeNodeElementLight(CX3DImporter_NodeElement::ENET_DirectionalLight, NodeElement_Cur);
            if (!def.empty())
                ne->ID = def;
            else
                ne->ID = "DirectionalLight_" + to_string((size_t)ne); // make random name

            ((X3DNodeNodeElementLight *)ne)->AmbientIntensity = ambientIntensity;
            ((X3DNodeNodeElementLight *)ne)->Color = color;
            ((X3DNodeNodeElementLight *)ne)->Direction = direction;
            ((X3DNodeNodeElementLight *)ne)->Global = global;
            ((X3DNodeNodeElementLight *)ne)->Intensity = intensity;
            // Assimp want a node with name similar to a light. "Why? I don't no." )
            ParseHelper_Group_Begin(false);

            mNodeElementCur->ID = ne->ID; // assign name to node and return to light element.
            ParseHelper_Node_Exit();
            // check for child nodes
            if (!mReader->isEmptyElement())
                ParseNode_Metadata(ne, "DirectionalLight");
            else
                mNodeElementCur->Child.push_back(ne); // add made object as child to current element

            NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
        } // if(on)
    } // if(!use.empty()) else
}

// <PointLight
// DEF=""               ID
// USE=""               IDREF
// ambientIntensity="0" SFFloat [inputOutput]
// attenuation="1 0 0"  SFVec3f [inputOutput]
// color="1 1 1"        SFColor [inputOutput]
// global="true"        SFBool  [inputOutput]
// intensity="1"        SFFloat [inputOutput]
// location="0 0 0"     SFVec3f [inputOutput]
// on="true"            SFBool  [inputOutput]
// radius="100"         SFFloat [inputOutput]
// />
void X3DImporter::ParseNode_Lighting_PointLight() {
    std::string def, use;
    float ambientIntensity = 0;
    aiVector3D attenuation(1, 0, 0);
    aiColor3D color(1, 1, 1);
    bool global = true;
    float intensity = 1;
    aiVector3D location(0, 0, 0);
    bool on = true;
    float radius = 100;
    X3DNodeElementBase *ne = nullptr;

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("ambientIntensity", ambientIntensity, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("attenuation", attenuation, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_REF("color", color, XML_ReadNode_GetAttrVal_AsCol3f);
    MACRO_ATTRREAD_CHECK_RET("global", global, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("intensity", intensity, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("location", location, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_RET("on", on, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_PointLight, ne);
    } else {
        if (on) {
            // create and if needed - define new geometry object.
            ne = new X3DNodeNodeElementLight(X3DElemType::ENET_PointLight, mNodeElementCur);
            if (!def.empty()) ne->ID = def;

            ((X3DNodeNodeElementLight *)ne)->AmbientIntensity = ambientIntensity;
            ((X3DNodeNodeElementLight *)ne)->Attenuation = attenuation;
            ((X3DNodeNodeElementLight *)ne)->Color = color;
            ((X3DNodeNodeElementLight *)ne)->Global = global;
            ((X3DNodeNodeElementLight *)ne)->Intensity = intensity;
            ((X3DNodeNodeElementLight *)ne)->Location = location;
            ((X3DNodeNodeElementLight *)ne)->Radius = radius;
            // Assimp want a node with name similar to a light. "Why? I don't no." )
            ParseHelper_Group_Begin(false);
            // make random name
            if (ne->ID.empty()) ne->ID = "PointLight_" + to_string((size_t)ne);

            mNodeElementCur->ID = ne->ID; // assign name to node and return to light element.
            ParseHelper_Node_Exit();
            // check for child nodes
            if (!mReader->isEmptyElement())
                ParseNode_Metadata(ne, "PointLight");
            else
                mNodeElementCur->Child.push_back(ne); // add made object as child to current element

            NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
        } // if(on)
    } // if(!use.empty()) else
}

// <SpotLight
// DEF=""                 ID
// USE=""                 IDREF
// ambientIntensity="0"   SFFloat [inputOutput]
// attenuation="1 0 0"    SFVec3f [inputOutput]
// beamWidth="0.7854"     SFFloat [inputOutput]
// color="1 1 1"          SFColor [inputOutput]
// cutOffAngle="1.570796" SFFloat [inputOutput]
// direction="0 0 -1"     SFVec3f [inputOutput]
// global="true"          SFBool  [inputOutput]
// intensity="1"          SFFloat [inputOutput]
// location="0 0 0"       SFVec3f [inputOutput]
// on="true"              SFBool  [inputOutput]
// radius="100"           SFFloat [inputOutput]
// />
void X3DImporter::ParseNode_Lighting_SpotLight() {
    std::string def, use;
    float ambientIntensity = 0;
    aiVector3D attenuation(1, 0, 0);
    float beamWidth = 0.7854f;
    aiColor3D color(1, 1, 1);
    float cutOffAngle = 1.570796f;
    aiVector3D direction(0, 0, -1);
    bool global = true;
    float intensity = 1;
    aiVector3D location(0, 0, 0);
    bool on = true;
    float radius = 100;
    X3DNodeElementBase *ne = nullptr;

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("ambientIntensity", ambientIntensity, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("attenuation", attenuation, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_RET("beamWidth", beamWidth, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("color", color, XML_ReadNode_GetAttrVal_AsCol3f);
    MACRO_ATTRREAD_CHECK_RET("cutOffAngle", cutOffAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("direction", direction, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_RET("global", global, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("intensity", intensity, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("location", location, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_RET("on", on, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_SpotLight, ne);
    } else {
        if (on) {
            // create and if needed - define new geometry object.
            ne = new X3DNodeNodeElementLight(X3DElemType::ENET_SpotLight, mNodeElementCur);
            if (!def.empty())
                ne->ID = def;

            if (beamWidth > cutOffAngle)
                beamWidth = cutOffAngle;

            ((X3DNodeNodeElementLight *)ne)->AmbientIntensity = ambientIntensity;
            ((X3DNodeNodeElementLight *)ne)->Attenuation = attenuation;
            ((X3DNodeNodeElementLight *)ne)->BeamWidth = beamWidth;
            ((X3DNodeNodeElementLight *)ne)->Color = color;
            ((X3DNodeNodeElementLight *)ne)->CutOffAngle = cutOffAngle;
            ((X3DNodeNodeElementLight *)ne)->Direction = direction;
            ((X3DNodeNodeElementLight *)ne)->Global = global;
            ((X3DNodeNodeElementLight *)ne)->Intensity = intensity;
            ((X3DNodeNodeElementLight *)ne)->Location = location;
            ((X3DNodeNodeElementLight *)ne)->Radius = radius;

            // Assimp want a node with name similar to a light. "Why? I don't no." )
            ParseHelper_Group_Begin(false);
            // make random name
            if (ne->ID.empty()) ne->ID = "SpotLight_" + to_string((size_t)ne);

            mNodeElementCur->ID = ne->ID; // assign name to node and return to light element.
            ParseHelper_Node_Exit();
            // check for child nodes
            if (!mReader->isEmptyElement())
                ParseNode_Metadata(ne, "SpotLight");
            else
                mNodeElementCur->Child.push_back(ne); // add made object as child to current element

            NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
        } // if(on)
    } // if(!use.empty()) else
}

void X3DImporter::ParseNode_Grouping_Group() {
    std::string def, use;

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        X3DNodeElementBase *ne = nullptr;

        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Group, ne);
    } else {
        ParseHelper_Group_Begin(); // create new grouping element and go deeper if node has children.
        // at this place new group mode created and made current, so we can name it.
        if (!def.empty()) mNodeElementCur->ID = def;
        // in grouping set of nodes check X3DMetadataObject is not needed, because it is done in <Scene> parser function.

        // for empty element exit from node in that place
        if (mReader->isEmptyElement()) ParseHelper_Node_Exit();
    } // if(!use.empty()) else
}

void X3DImporter::ParseNode_Grouping_GroupEnd() {
    ParseHelper_Node_Exit(); // go up in scene graph
}

// <StaticGroup
// DEF=""              ID
// USE=""              IDREF
// bboxCenter="0 0 0"  SFVec3f [initializeOnly]
// bboxSize="-1 -1 -1" SFVec3f [initializeOnly]
// >
//    <!-- ChildContentModel -->
// ChildContentModel is the child-node content model corresponding to X3DChildNode, combining all profiles. ChildContentModel can contain most nodes,
// other Grouping nodes, Prototype declarations and ProtoInstances in any order and any combination. When the assigned profile is less than Full, the
// precise palette of legal nodes that are available depends on assigned profile and components.
// A ProtoInstance node (with the proper node type) can be substituted for any node in this content model.
// </StaticGroup>
// The StaticGroup node contains children nodes which cannot be modified. StaticGroup children are guaranteed to not change, send events, receive events or
// contain any USE references outside the StaticGroup.
void X3DImporter::ParseNode_Grouping_StaticGroup() {
    std::string def, use;

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        X3DNodeElementBase *ne = nullptr;

        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Group, ne);
    } else {
        ParseHelper_Group_Begin(true); // create new grouping element and go deeper if node has children.
        // at this place new group mode created and made current, so we can name it.
        if (!def.empty()) mNodeElementCur->ID = def;
        // in grouping set of nodes check X3DMetadataObject is not needed, because it is done in <Scene> parser function.

        // for empty element exit from node in that place
        if (mReader->isEmptyElement()) ParseHelper_Node_Exit();
    } // if(!use.empty()) else
}

void X3DImporter::ParseNode_Grouping_StaticGroupEnd() {
    ParseHelper_Node_Exit(); // go up in scene graph
}

// <Switch
// DEF=""              ID
// USE=""              IDREF
// bboxCenter="0 0 0"  SFVec3f [initializeOnly]
// bboxSize="-1 -1 -1" SFVec3f [initializeOnly]
// whichChoice="-1"    SFInt32 [inputOutput]
// >
//    <!-- ChildContentModel -->
// ChildContentModel is the child-node content model corresponding to X3DChildNode, combining all profiles. ChildContentModel can contain most nodes,
// other Grouping nodes, Prototype declarations and ProtoInstances in any order and any combination. When the assigned profile is less than Full, the
// precise palette of legal nodes that are available depends on assigned profile and components.
// A ProtoInstance node (with the proper node type) can be substituted for any node in this content model.
// </Switch>
// The Switch grouping node traverses zero or one of the nodes specified in the children field. The whichChoice field specifies the index of the child
// to traverse, with the first child having index 0. If whichChoice is less than zero or greater than the number of nodes in the children field, nothing
// is chosen.
void X3DImporter::ParseNode_Grouping_Switch() {
    std::string def, use;
    int32_t whichChoice = -1;

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("whichChoice", whichChoice, XML_ReadNode_GetAttrVal_AsI32);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        CX3DImporter_NodeElement *ne;

        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Group, ne);
    } else {
        ParseHelper_Group_Begin(); // create new grouping element and go deeper if node has children.
        // at this place new group mode created and made current, so we can name it.
        if (!def.empty()) NodeElement_Cur->ID = def;

        // also set values specific to this type of group
        ((CX3DNodeElementGroup *)NodeElement_Cur)->UseChoice = true;
        ((CX3DNodeElementGroup *)NodeElement_Cur)->Choice = whichChoice;
        // in grouping set of nodes check X3DMetadataObject is not needed, because it is done in <Scene> parser function.

        // for empty element exit from node in that place
        if (mReader->isEmptyElement()) ParseHelper_Node_Exit();
    } // if(!use.empty()) else
}

void X3DImporter::ParseNode_Grouping_SwitchEnd() {
    // just exit from node. Defined choice will be accepted at postprocessing stage.
    ParseHelper_Node_Exit(); // go up in scene graph
}

// <Transform
// DEF=""                     ID
// USE=""                     IDREF
// bboxCenter="0 0 0"         SFVec3f    [initializeOnly]
// bboxSize="-1 -1 -1"        SFVec3f    [initializeOnly]
// center="0 0 0"             SFVec3f    [inputOutput]
// rotation="0 0 1 0"         SFRotation [inputOutput]
// scale="1 1 1"              SFVec3f    [inputOutput]
// scaleOrientation="0 0 1 0" SFRotation [inputOutput]
// translation="0 0 0"        SFVec3f    [inputOutput]
// >
//    <!-- ChildContentModel -->
// ChildContentModel is the child-node content model corresponding to X3DChildNode, combining all profiles. ChildContentModel can contain most nodes,
// other Grouping nodes, Prototype declarations and ProtoInstances in any order and any combination. When the assigned profile is less than Full, the
// precise palette of legal nodes that are available depends on assigned profile and components.
// A ProtoInstance node (with the proper node type) can be substituted for any node in this content model.
// </Transform>
// The Transform node is a grouping node that defines a coordinate system for its children that is relative to the coordinate systems of its ancestors.
// Given a 3-dimensional point P and Transform node, P is transformed into point P' in its parent's coordinate system by a series of intermediate
// transformations. In matrix transformation notation, where C (center), SR (scaleOrientation), T (translation), R (rotation), and S (scale) are the
// equivalent transformation matrices,
//   P' = T * C * R * SR * S * -SR * -C * P
void X3DImporter::ParseNode_Grouping_Transform() {
    aiVector3D center(0, 0, 0);
    float rotation[4] = { 0, 0, 1, 0 };
    aiVector3D scale(1, 1, 1); // A value of zero indicates that any child geometry shall not be displayed
    float scale_orientation[4] = { 0, 0, 1, 0 };
    aiVector3D translation(0, 0, 0);
    aiMatrix4x4 matr, tmatr;
    std::string use, def;

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_REF("center", center, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_REF("scale", scale, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_REF("translation", translation, XML_ReadNode_GetAttrVal_AsVec3f);
    if (an == "rotation") {
        std::vector<float> tvec;

        XML_ReadNode_GetAttrVal_AsArrF(idx, tvec);
        if (tvec.size() != 4) throw DeadlyImportError("<Transform>: rotation vector must have 4 elements.");

        memcpy(rotation, tvec.data(), sizeof(rotation));

        continue;
    }

    if (an == "scaleOrientation") {
        std::vector<float> tvec;
        XML_ReadNode_GetAttrVal_AsArrF(idx, tvec);
        if (tvec.size() != 4) {
            throw DeadlyImportError("<Transform>: scaleOrientation vector must have 4 elements.");
        }

        ::memcpy(scale_orientation, tvec.data(), sizeof(scale_orientation));

        continue;
    }

    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        CX3DImporter_NodeElement *ne(nullptr);

        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Group, ne);
    } else {
        ParseHelper_Group_Begin(); // create new grouping element and go deeper if node has children.
        // at this place new group mode created and made current, so we can name it.
        if (!def.empty()) {
            NodeElement_Cur->ID = def;
        }

        //
        // also set values specific to this type of group
        //
        // calculate transformation matrix
        aiMatrix4x4::Translation(translation, matr); // T
        aiMatrix4x4::Translation(center, tmatr); // C
        matr *= tmatr;
        aiMatrix4x4::Rotation(rotation[3], aiVector3D(rotation[0], rotation[1], rotation[2]), tmatr); // R
        matr *= tmatr;
        aiMatrix4x4::Rotation(scale_orientation[3], aiVector3D(scale_orientation[0], scale_orientation[1], scale_orientation[2]), tmatr); // SR
        matr *= tmatr;
        aiMatrix4x4::Scaling(scale, tmatr); // S
        matr *= tmatr;
        aiMatrix4x4::Rotation(-scale_orientation[3], aiVector3D(scale_orientation[0], scale_orientation[1], scale_orientation[2]), tmatr); // -SR
        matr *= tmatr;
        aiMatrix4x4::Translation(-center, tmatr); // -C
        matr *= tmatr;
        // and assign it
        ((CX3DNodeElementGroup *)mNodeElementCur)->Transformation = matr;
        // in grouping set of nodes check X3DMetadataObject is not needed, because it is done in <Scene> parser function.

        // for empty element exit from node in that place
        if (mReader->isEmptyElement()) {
            ParseHelper_Node_Exit();
        }
    } // if(!use.empty()) else
}

void X3DImporter::ParseNode_Grouping_TransformEnd() {
    ParseHelper_Node_Exit(); // go up in scene graph
}

void X3DImporter::ParseNode_Geometry2D_Arc2D() {
    std::string def, use;
    float endAngle = AI_MATH_HALF_PI_F;
    float radius = 1;
    float startAngle = 0;
    X3DNodeElementBase *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("endAngle", endAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("startAngle", startAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Arc2D, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_Arc2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // create point list of geometry object and convert it to line set.
        std::list<aiVector3D> tlist;

        GeometryHelper_Make_Arc2D(startAngle, endAngle, radius, 10, tlist); ///TODO: IME - AI_CONFIG for NumSeg
        GeometryHelper_Extend_PointToLine(tlist, ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices);
        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 2;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Arc2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <ArcClose2D
// DEF=""              ID
// USE=""              IDREF
// closureType="PIE"   SFString [initializeOnly], {"PIE", "CHORD"}
// endAngle="1.570796" SFFloat  [initializeOnly]
// radius="1"          SFFloat  [initializeOnly]
// solid="false"       SFBool   [initializeOnly]
// startAngle="0"      SFFloat  [initializeOnly]
// />
// The ArcClose node specifies a portion of a circle whose center is at (0,0) and whose angles are measured starting at the positive x-axis and sweeping
// towards the positive y-axis. The end points of the arc specified are connected as defined by the closureType field. The radius field specifies the radius
// of the circle of which the arc is a portion. The arc extends from the startAngle counterclockwise to the endAngle. The value of radius shall be greater
// than zero. The values of startAngle and endAngle shall be in the range [-2pi, 2pi] radians (or the equivalent if a different default angle base unit has
// been specified). If startAngle and endAngle have the same value, a circle is specified and closureType is ignored. If the absolute difference between
// startAngle and endAngle is greater than or equal to 2pi, a complete circle is produced with no chord or radial line(s) drawn from the center.
// A closureType of "PIE" connects the end point to the start point by defining two straight line segments first from the end point to the center and then
// the center to the start point. A closureType of "CHORD" connects the end point to the start point by defining a straight line segment from the end point
// to the start point. Textures are applied individually to each face of the ArcClose2D. On the front (+Z) and back (-Z) faces of the ArcClose2D, when
// viewed from the +Z-axis, the texture is mapped onto each face with the same orientation as if the image were displayed normally in 2D.
void X3DImporter::ParseNode_Geometry2D_ArcClose2D() {
    std::string def, use;
    std::string closureType("PIE");
    float endAngle = AI_MATH_HALF_PI_F;
    float radius = 1;
    bool solid = false;
    float startAngle = 0;
    X3DNodeElementBase *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("closureType", closureType, mReader->getAttributeValue);
    MACRO_ATTRREAD_CHECK_RET("endAngle", endAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("startAngle", startAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_ArcClose2D, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_ArcClose2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        ((CX3DImporter_NodeElement_Geometry2D *)ne)->Solid = solid;
        // create point list of geometry object.
        GeometryHelper_Make_Arc2D(startAngle, endAngle, radius, 10, ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices); ///TODO: IME - AI_CONFIG for NumSeg
        // add chord or two radiuses only if not a circle was defined
        if (!((std::fabs(endAngle - startAngle) >= AI_MATH_TWO_PI_F) || (endAngle == startAngle))) {
            std::list<aiVector3D> &vlist = ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices; // just short alias.

            if ((closureType == "PIE") || (closureType == "\"PIE\""))
                vlist.push_back(aiVector3D(0, 0, 0)); // center point - first radial line
            else if ((closureType != "CHORD") && (closureType != "\"CHORD\""))
                Throw_IncorrectAttrValue("closureType");

            vlist.push_back(*vlist.begin()); // arc first point - chord from first to last point of arc(if CHORD) or second radial line(if PIE).
        }

        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices.size();
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "ArcClose2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Circle2D
// DEF=""     ID
// USE=""     IDREF
// radius="1" SFFloat  [initializeOnly]
// />
void X3DImporter::ParseNode_Geometry2D_Circle2D() {
    std::string def, use;
    float radius = 1;
    X3DNodeElementBase *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Circle2D, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_Circle2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // create point list of geometry object and convert it to line set.
        std::list<aiVector3D> tlist;

        GeometryHelper_Make_Arc2D(0, 0, radius, 10, tlist); ///TODO: IME - AI_CONFIG for NumSeg
        GeometryHelper_Extend_PointToLine(tlist, ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices);
        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 2;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Circle2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Disk2D
// DEF=""          ID
// USE=""          IDREF
// innerRadius="0" SFFloat  [initializeOnly]
// outerRadius="1" SFFloat  [initializeOnly]
// solid="false"   SFBool   [initializeOnly]
// />
// The Disk2D node specifies a circular disk which is centred at (0, 0) in the local coordinate system. The outerRadius field specifies the radius of the
// outer dimension of the Disk2D. The innerRadius field specifies the inner dimension of the Disk2D. The value of outerRadius shall be greater than zero.
// The value of innerRadius shall be greater than or equal to zero and less than or equal to outerRadius. If innerRadius is zero, the Disk2D is completely
// filled. Otherwise, the area within the innerRadius forms a hole in the Disk2D. If innerRadius is equal to outerRadius, a solid circular line shall
// be drawn using the current line properties. Textures are applied individually to each face of the Disk2D. On the front (+Z) and back (-Z) faces of
// the Disk2D, when viewed from the +Z-axis, the texture is mapped onto each face with the same orientation as if the image were displayed normally in 2D.
void X3DImporter::ParseNode_Geometry2D_Disk2D() {
    std::string def, use;
    float innerRadius = 0;
    float outerRadius = 1;
    bool solid = false;
    X3DNodeElementBase *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("innerRadius", innerRadius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("outerRadius", outerRadius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Disk2D, ne);
    } else {
        std::list<aiVector3D> tlist_o, tlist_i;

        if (innerRadius > outerRadius) Throw_IncorrectAttrValue("innerRadius");

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_Disk2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // create point list of geometry object.
        ///TODO: IME - AI_CONFIG for NumSeg
        GeometryHelper_Make_Arc2D(0, 0, outerRadius, 10, tlist_o); // outer circle
        if (innerRadius == 0.0f) { // make filled disk
            // in tlist_o we already have points of circle. just copy it and sign as polygon.
            ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices = tlist_o;
            ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = tlist_o.size();
        } else if (innerRadius == outerRadius) { // make circle
            // in tlist_o we already have points of circle. convert it to line set.
            GeometryHelper_Extend_PointToLine(tlist_o, ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices);
            ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 2;
        } else { // make disk
            std::list<aiVector3D> &vlist = ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices; // just short alias.

            GeometryHelper_Make_Arc2D(0, 0, innerRadius, 10, tlist_i); // inner circle
            //
            // create quad list from two point lists
            //
            if (tlist_i.size() < 2) throw DeadlyImportError("Disk2D. Not enough points for creating quad list."); // tlist_i and tlist_o has equal size.

            // add all quads except last
            for (std::list<aiVector3D>::iterator it_i = tlist_i.begin(), it_o = tlist_o.begin(); it_i != tlist_i.end();) {
                // do not forget - CCW direction
                vlist.push_back(*it_i++); // 1st point
                vlist.push_back(*it_o++); // 2nd point
                vlist.push_back(*it_o); // 3rd point
                vlist.push_back(*it_i); // 4th point
            }

            // add last quad
            vlist.push_back(*tlist_i.end()); // 1st point
            vlist.push_back(*tlist_o.end()); // 2nd point
            vlist.push_back(*tlist_o.begin()); // 3rd point
            vlist.push_back(*tlist_o.begin()); // 4th point

            ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 4;
        }

        ((CX3DImporter_NodeElement_Geometry2D *)ne)->Solid = solid;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Disk2D");
        else
            mNodeElementCur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Polyline2D
// DEF=""          ID
// USE=""          IDREF
// lineSegments="" MFVec2F [intializeOnly]
// />
void X3DImporter::ParseNode_Geometry2D_Polyline2D() {
    std::string def, use;
    std::list<aiVector2D> lineSegments;
    X3DNodeElementBase *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_REF("lineSegments", lineSegments, XML_ReadNode_GetAttrVal_AsListVec2f);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Polyline2D, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_Polyline2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        //
        // convert read point list of geometry object to line set.
        //
        std::list<aiVector3D> tlist;

        // convert vec2 to vec3
        for (std::list<aiVector2D>::iterator it2 = lineSegments.begin(); it2 != lineSegments.end(); ++it2)
            tlist.push_back(aiVector3D(it2->x, it2->y, 0));

        // convert point set to line set
        GeometryHelper_Extend_PointToLine(tlist, ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices);
        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 2;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Polyline2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Polypoint2D
// DEF=""   ID
// USE=""   IDREF
// point="" MFVec2F [inputOutput]
// />
void X3DImporter::ParseNode_Geometry2D_Polypoint2D() {
    std::string def, use;
    std::list<aiVector2D> point;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_REF("point", point, XML_ReadNode_GetAttrVal_AsListVec2f);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Polypoint2D, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_Polypoint2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // convert vec2 to vec3
        for (std::list<aiVector2D>::iterator it2 = point.begin(); it2 != point.end(); ++it2) {
            ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices.push_back(aiVector3D(it2->x, it2->y, 0));
        }

        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 1;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Polypoint2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Rectangle2D
// DEF=""        ID
// USE=""        IDREF
// size="2 2"    SFVec2f [initializeOnly]
// solid="false" SFBool  [initializeOnly]
// />
void X3DImporter::ParseNode_Geometry2D_Rectangle2D() {
    std::string def, use;
    aiVector2D size(2, 2);
    bool solid = false;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_REF("size", size, XML_ReadNode_GetAttrVal_AsVec2f);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Rectangle2D, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_Rectangle2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        float x1 = -size.x / 2.0f;
        float x2 = size.x / 2.0f;
        float y1 = -size.y / 2.0f;
        float y2 = size.y / 2.0f;
        std::list<aiVector3D> &vlist = ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices; // just short alias.

        vlist.push_back(aiVector3D(x2, y1, 0)); // 1st point
        vlist.push_back(aiVector3D(x2, y2, 0)); // 2nd point
        vlist.push_back(aiVector3D(x1, y2, 0)); // 3rd point
        vlist.push_back(aiVector3D(x1, y1, 0)); // 4th point
        ((CX3DImporter_NodeElement_Geometry2D *)ne)->Solid = solid;
        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 4;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Rectangle2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <TriangleSet2D
// DEF=""        ID
// USE=""        IDREF
// solid="false" SFBool  [initializeOnly]
// vertices=""   MFVec2F [inputOutput]
// />
void X3DImporter::ParseNode_Geometry2D_TriangleSet2D() {
    std::string def, use;
    bool solid = false;
    std::list<aiVector2D> vertices;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_REF("vertices", vertices, XML_ReadNode_GetAttrVal_AsListVec2f);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_TriangleSet2D, ne);
    } else {
        if (vertices.size() % 3) throw DeadlyImportError("TriangleSet2D. Not enough points for defining triangle.");

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry2D(CX3DImporter_NodeElement::ENET_TriangleSet2D, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // convert vec2 to vec3
        for (std::list<aiVector2D>::iterator it2 = vertices.begin(); it2 != vertices.end(); ++it2) {
            ((CX3DImporter_NodeElement_Geometry2D *)ne)->Vertices.push_back(aiVector3D(it2->x, it2->y, 0));
        }

        ((CX3DImporter_NodeElement_Geometry2D *)ne)->Solid = solid;
        ((CX3DImporter_NodeElement_Geometry2D *)ne)->NumIndices = 3;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "TriangleSet2D");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Box
// DEF=""       ID
// USE=""       IDREF
// size="2 2 2" SFVec3f [initializeOnly]
// solid="true" SFBool  [initializeOnly]
// />
// The Box node specifies a rectangular parallelepiped box centred at (0, 0, 0) in the local coordinate system and aligned with the local coordinate axes.
// By default, the box measures 2 units in each dimension, from -1 to +1. The size field specifies the extents of the box along the X-, Y-, and Z-axes
// respectively and each component value shall be greater than zero.
void X3DImporter::ParseNode_Geometry3D_Box() {
    std::string def, use;
    bool solid = true;
    aiVector3D size(2, 2, 2);
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_REF("size", size, XML_ReadNode_GetAttrVal_AsVec3f);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Box, ne);
    } else {
        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry3D(CX3DImporter_NodeElement::ENET_Box, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        GeometryHelper_MakeQL_RectParallelepiped(size, ((CX3DImporter_NodeElement_Geometry3D *)ne)->Vertices); // get quad list
        ((CX3DImporter_NodeElement_Geometry3D *)ne)->Solid = solid;
        ((CX3DImporter_NodeElement_Geometry3D *)ne)->NumIndices = 4;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Box");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Cone
// DEF=""           ID
// USE=""           IDREF
// bottom="true"    SFBool [initializeOnly]
// bottomRadius="1" SFloat [initializeOnly]
// height="2"       SFloat [initializeOnly]
// side="true"      SFBool [initializeOnly]
// solid="true"     SFBool [initializeOnly]
// />
void X3DImporter::ParseNode_Geometry3D_Cone() {
    std::string use, def;
    bool bottom = true;
    float bottomRadius = 1;
    float height = 2;
    bool side = true;
    bool solid = true;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("side", side, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("bottom", bottom, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("height", height, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("bottomRadius", bottomRadius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Cone, ne);
    } else {
        const unsigned int tess = 30; ///TODO: IME tessellation factor through ai_property

        std::vector<aiVector3D> tvec; // temp array for vertices.

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry3D(CX3DImporter_NodeElement::ENET_Cone, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // make cone or parts according to flags.
        if (side) {
            StandardShapes::MakeCone(height, 0, bottomRadius, tess, tvec, !bottom);
        } else if (bottom) {
            StandardShapes::MakeCircle(bottomRadius, tess, tvec);
            height = -(height / 2);
            for (std::vector<aiVector3D>::iterator it = tvec.begin(); it != tvec.end(); ++it)
                it->y = height; // y - because circle made in oXZ.
        }

        // copy data from temp array
        for (std::vector<aiVector3D>::iterator it = tvec.begin(); it != tvec.end(); ++it)
            ((CX3DImporter_NodeElement_Geometry3D *)ne)->Vertices.push_back(*it);

        ((CX3DImporter_NodeElement_Geometry3D *)ne)->Solid = solid;
        ((CX3DImporter_NodeElement_Geometry3D *)ne)->NumIndices = 3;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Cone");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Cylinder
// DEF=""        ID
// USE=""        IDREF
// bottom="true" SFBool [initializeOnly]
// height="2"    SFloat [initializeOnly]
// radius="1"    SFloat [initializeOnly]
// side="true"   SFBool [initializeOnly]
// solid="true"  SFBool [initializeOnly]
// top="true"    SFBool [initializeOnly]
// />
void X3DImporter::ParseNode_Geometry3D_Cylinder() {
    std::string use, def;
    bool bottom = true;
    float height = 2;
    float radius = 1;
    bool side = true;
    bool solid = true;
    bool top = true;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("bottom", bottom, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("top", top, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("side", side, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("height", height, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Cylinder, ne);
    } else {
        const unsigned int tess = 30; ///TODO: IME tessellation factor through ai_property

        std::vector<aiVector3D> tside; // temp array for vertices of side.
        std::vector<aiVector3D> tcir; // temp array for vertices of circle.

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry3D(CX3DImporter_NodeElement::ENET_Cylinder, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        // make cilynder or parts according to flags.
        if (side) StandardShapes::MakeCone(height, radius, radius, tess, tside, true);

        height /= 2; // height defined for whole cylinder, when creating top and bottom circle we are using just half of height.
        if (top || bottom) StandardShapes::MakeCircle(radius, tess, tcir);
        // copy data from temp arrays
        std::list<aiVector3D> &vlist = ((CX3DImporter_NodeElement_Geometry3D *)ne)->Vertices; // just short alias.

        for (std::vector<aiVector3D>::iterator it = tside.begin(); it != tside.end(); ++it)
            vlist.push_back(*it);

        if (top) {
            for (std::vector<aiVector3D>::iterator it = tcir.begin(); it != tcir.end(); ++it) {
                (*it).y = height; // y - because circle made in oXZ.
                vlist.push_back(*it);
            }
        } // if(top)

        if (bottom) {
            for (std::vector<aiVector3D>::iterator it = tcir.begin(); it != tcir.end(); ++it) {
                (*it).y = -height; // y - because circle made in oXZ.
                vlist.push_back(*it);
            }
        } // if(top)

        ((CX3DImporter_NodeElement_Geometry3D *)ne)->Solid = solid;
        ((CX3DImporter_NodeElement_Geometry3D *)ne)->NumIndices = 3;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Cylinder");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <ElevationGrid
// DEF=""                 ID
// USE=""                 IDREF
// ccw="true"             SFBool  [initializeOnly]
// colorPerVertex="true"  SFBool  [initializeOnly]
// creaseAngle="0"        SFloat  [initializeOnly]
// height=""              MFloat  [initializeOnly]
// normalPerVertex="true" SFBool  [initializeOnly]
// solid="true"           SFBool  [initializeOnly]
// xDimension="0"         SFInt32 [initializeOnly]
// xSpacing="1.0"         SFloat  [initializeOnly]
// zDimension="0"         SFInt32 [initializeOnly]
// zSpacing="1.0"         SFloat  [initializeOnly]
// >
//   <!-- ColorNormalTexCoordContentModel -->
// ColorNormalTexCoordContentModel can contain Color (or ColorRGBA), Normal and TextureCoordinate, in any order. No more than one instance of any single
// node type is allowed. A ProtoInstance node (with the proper node type) can be substituted for any node in this content model.
// </ElevationGrid>
// The ElevationGrid node specifies a uniform rectangular grid of varying height in the Y=0 plane of the local coordinate system. The geometry is described
// by a scalar array of height values that specify the height of a surface above each point of the grid. The xDimension and zDimension fields indicate
// the number of elements of the grid height array in the X and Z directions. Both xDimension and zDimension shall be greater than or equal to zero.
// If either the xDimension or the zDimension is less than two, the ElevationGrid contains no quadrilaterals.
void X3DImporter::ParseNode_Geometry3D_ElevationGrid() {
    std::string use, def;
    bool ccw = true;
    bool colorPerVertex = true;
    float creaseAngle = 0;
    std::vector<float> height;
    bool normalPerVertex = true;
    bool solid = true;
    int32_t xDimension = 0;
    float xSpacing = 1;
    int32_t zDimension = 0;
    float zSpacing = 1;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("ccw", ccw, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("colorPerVertex", colorPerVertex, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("normalPerVertex", normalPerVertex, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("creaseAngle", creaseAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("height", height, XML_ReadNode_GetAttrVal_AsArrF);
    MACRO_ATTRREAD_CHECK_RET("xDimension", xDimension, XML_ReadNode_GetAttrVal_AsI32);
    MACRO_ATTRREAD_CHECK_RET("xSpacing", xSpacing, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("zDimension", zDimension, XML_ReadNode_GetAttrVal_AsI32);
    MACRO_ATTRREAD_CHECK_RET("zSpacing", zSpacing, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_ElevationGrid, ne);
    } else {
        if ((xSpacing == 0.0f) || (zSpacing == 0.0f)) throw DeadlyImportError("Spacing in <ElevationGrid> must be grater than zero.");
        if ((xDimension <= 0) || (zDimension <= 0)) throw DeadlyImportError("Dimension in <ElevationGrid> must be grater than zero.");
        if ((size_t)(xDimension * zDimension) != height.size()) Throw_IncorrectAttrValue("Heights count must be equal to \"xDimension * zDimension\"");

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_ElevationGrid(CX3DImporter_NodeElement::ENET_ElevationGrid, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        CX3DImporter_NodeElement_ElevationGrid &grid_alias = *((CX3DImporter_NodeElement_ElevationGrid *)ne); // create alias for conveience

        { // create grid vertices list
            std::vector<float>::const_iterator he_it = height.begin();

            for (int32_t zi = 0; zi < zDimension; zi++) // rows
            {
                for (int32_t xi = 0; xi < xDimension; xi++) // columns
                {
                    aiVector3D tvec(xSpacing * xi, *he_it, zSpacing * zi);

                    grid_alias.Vertices.push_back(tvec);
                    ++he_it;
                }
            }
        } // END: create grid vertices list
        //
        // create faces list. In "coordIdx" format
        //
        // check if we have quads
        if ((xDimension < 2) || (zDimension < 2)) // only one element in dimension is set, create line set.
        {
            ((CX3DImporter_NodeElement_ElevationGrid *)ne)->NumIndices = 2; // will be holded as line set.
            for (size_t i = 0, i_e = (grid_alias.Vertices.size() - 1); i < i_e; i++) {
                grid_alias.CoordIdx.push_back(static_cast<int32_t>(i));
                grid_alias.CoordIdx.push_back(static_cast<int32_t>(i + 1));
                grid_alias.CoordIdx.push_back(-1);
            }
        } else // two or more elements in every dimension is set. create quad set.
        {
            ((CX3DImporter_NodeElement_ElevationGrid *)ne)->NumIndices = 4;
            for (int32_t fzi = 0, fzi_e = (zDimension - 1); fzi < fzi_e; fzi++) // rows
            {
                for (int32_t fxi = 0, fxi_e = (xDimension - 1); fxi < fxi_e; fxi++) // columns
                {
                    // points direction in face.
                    if (ccw) {
                        // CCW:
                        //	3 2
                        //	0 1
                        grid_alias.CoordIdx.push_back((fzi + 1) * xDimension + fxi);
                        grid_alias.CoordIdx.push_back((fzi + 1) * xDimension + (fxi + 1));
                        grid_alias.CoordIdx.push_back(fzi * xDimension + (fxi + 1));
                        grid_alias.CoordIdx.push_back(fzi * xDimension + fxi);
                    } else {
                        // CW:
                        //	0 1
                        //	3 2
                        grid_alias.CoordIdx.push_back(fzi * xDimension + fxi);
                        grid_alias.CoordIdx.push_back(fzi * xDimension + (fxi + 1));
                        grid_alias.CoordIdx.push_back((fzi + 1) * xDimension + (fxi + 1));
                        grid_alias.CoordIdx.push_back((fzi + 1) * xDimension + fxi);
                    } // if(ccw) else

                    grid_alias.CoordIdx.push_back(-1);
                } // for(int32_t fxi = 0, fxi_e = (xDimension - 1); fxi < fxi_e; fxi++)
            } // for(int32_t fzi = 0, fzi_e = (zDimension - 1); fzi < fzi_e; fzi++)
        } // if((xDimension < 2) || (zDimension < 2)) else

        grid_alias.ColorPerVertex = colorPerVertex;
        grid_alias.NormalPerVertex = normalPerVertex;
        grid_alias.CreaseAngle = creaseAngle;
        grid_alias.Solid = solid;
        // check for child nodes
        if (!mReader->isEmptyElement()) {
            ParseHelper_Node_Enter(ne);
            MACRO_NODECHECK_LOOPBEGIN("ElevationGrid");
            // check for X3DComposedGeometryNodes
            if (XML_CheckNode_NameEqual("Color")) {
                ParseNode_Rendering_Color();
                continue;
            }
            if (XML_CheckNode_NameEqual("ColorRGBA")) {
                ParseNode_Rendering_ColorRGBA();
                continue;
            }
            if (XML_CheckNode_NameEqual("Normal")) {
                ParseNode_Rendering_Normal();
                continue;
            }
            if (XML_CheckNode_NameEqual("TextureCoordinate")) {
                ParseNode_Texturing_TextureCoordinate();
                continue;
            }
            // check for X3DMetadataObject
            if (!ParseHelper_CheckRead_X3DMetadataObject()) XML_CheckNode_SkipUnsupported("ElevationGrid");

            MACRO_NODECHECK_LOOPEND("ElevationGrid");
            ParseHelper_Node_Exit();
        } // if(!mReader->isEmptyElement())
        else {
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element
        } // if(!mReader->isEmptyElement()) else

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

template <typename TVector>
static void GeometryHelper_Extrusion_CurveIsClosed(std::vector<TVector> &pCurve, const bool pDropTail, const bool pRemoveLastPoint, bool &pCurveIsClosed) {
    size_t cur_sz = pCurve.size();

    pCurveIsClosed = false;
    // for curve with less than four points checking is have no sense,
    if (cur_sz < 4) return;

    for (size_t s = 3, s_e = cur_sz; s < s_e; s++) {
        // search for first point of duplicated part.
        if (pCurve[0] == pCurve[s]) {
            bool found = true;

            // check if tail(indexed by b2) is duplicate of head(indexed by b1).
            for (size_t b1 = 1, b2 = (s + 1); b2 < cur_sz; b1++, b2++) {
                if (pCurve[b1] != pCurve[b2]) { // points not match: clear flag and break loop.
                    found = false;

                    break;
                }
            } // for(size_t b1 = 1, b2 = (s + 1); b2 < cur_sz; b1++, b2++)

            // if duplicate tail is found then drop or not it depending on flags.
            if (found) {
                pCurveIsClosed = true;
                if (pDropTail) {
                    if (!pRemoveLastPoint) s++; // prepare value for iterator's arithmetics.

                    pCurve.erase(pCurve.begin() + s, pCurve.end()); // remove tail
                }

                break;
            } // if(found)
        } // if(pCurve[0] == pCurve[s])
    } // for(size_t s = 3, s_e = (cur_sz - 1); s < s_e; s++)
}

static aiVector3D GeometryHelper_Extrusion_GetNextY(const size_t pSpine_PointIdx, const std::vector<aiVector3D> &pSpine, const bool pSpine_Closed) {
    const size_t spine_idx_last = pSpine.size() - 1;
    aiVector3D tvec;

    if ((pSpine_PointIdx == 0) || (pSpine_PointIdx == spine_idx_last)) // at first special cases
    {
        if (pSpine_Closed) { // If the spine curve is closed: The SCP for the first and last points is the same and is found using (spine[1] - spine[n - 2]) to compute the Y-axis.
            // As we even for closed spine curve last and first point in pSpine are not the same: duplicates(spine[n - 1] which are equivalent to spine[0])
            // in tail are removed.
            // So, last point in pSpine is a spine[n - 2]
            tvec = pSpine[1] - pSpine[spine_idx_last];
        } else if (pSpine_PointIdx == 0) { // The Y-axis used for the first point is the vector from spine[0] to spine[1]
            tvec = pSpine[1] - pSpine[0];
        } else { // The Y-axis used for the last point it is the vector from spine[n-2] to spine[n-1]. In our case(see above about dropping tail) spine[n - 1] is
            // the spine[0].
            tvec = pSpine[spine_idx_last] - pSpine[spine_idx_last - 1];
        }
    } // if((pSpine_PointIdx == 0) || (pSpine_PointIdx == spine_idx_last))
    else { // For all points other than the first or last: The Y-axis for spine[i] is found by normalizing the vector defined by (spine[i+1] - spine[i-1]).
        tvec = pSpine[pSpine_PointIdx + 1] - pSpine[pSpine_PointIdx - 1];
    } // if((pSpine_PointIdx == 0) || (pSpine_PointIdx == spine_idx_last)) else

    return tvec.Normalize();
}

static aiVector3D GeometryHelper_Extrusion_GetNextZ(const size_t pSpine_PointIdx, const std::vector<aiVector3D> &pSpine, const bool pSpine_Closed,
        const aiVector3D pVecZ_Prev) {
    const aiVector3D zero_vec(0);
    const size_t spine_idx_last = pSpine.size() - 1;

    aiVector3D tvec;

    // at first special cases
    if (pSpine.size() < 3) // spine have not enough points for vector calculations.
    {
        tvec.Set(0, 0, 1);
    } else if (pSpine_PointIdx == 0) // special case: first point
    {
        if (pSpine_Closed) // for calculating use previous point in curve s[n - 2]. In list it's a last point, because point s[n - 1] was removed as duplicate.
        {
            tvec = (pSpine[1] - pSpine[0]) ^ (pSpine[spine_idx_last] - pSpine[0]);
        } else // for not closed curve first and next point(s[0] and s[1]) has the same vector Z.
        {
            bool found = false;

            // As said: "If the Z-axis of the first point is undefined (because the spine is not closed and the first two spine segments are collinear)
            // then the Z-axis for the first spine point with a defined Z-axis is used."
            // Walk through spine and find Z.
            for (size_t next_point = 2; (next_point <= spine_idx_last) && !found; next_point++) {
                // (pSpine[2] - pSpine[1]) ^ (pSpine[0] - pSpine[1])
                tvec = (pSpine[next_point] - pSpine[next_point - 1]) ^ (pSpine[next_point - 2] - pSpine[next_point - 1]);
                found = !tvec.Equal(zero_vec);
            }

            // if entire spine are collinear then use OZ axis.
            if (!found) tvec.Set(0, 0, 1);
        } // if(pSpine_Closed) else
    } // else if(pSpine_PointIdx == 0)
    else if (pSpine_PointIdx == spine_idx_last) // special case: last point
    {
        if (pSpine_Closed) { // do not forget that real last point s[n - 1] is removed as duplicated. And in this case we are calculating vector Z for point s[n - 2].
            tvec = (pSpine[0] - pSpine[pSpine_PointIdx]) ^ (pSpine[pSpine_PointIdx - 1] - pSpine[pSpine_PointIdx]);
            // if taken spine vectors are collinear then use previous vector Z.
            if (tvec.Equal(zero_vec)) tvec = pVecZ_Prev;
        } else { // vector Z for last point of not closed curve is previous vector Z.
            tvec = pVecZ_Prev;
        }
    } else // regular point
    {
        tvec = (pSpine[pSpine_PointIdx + 1] - pSpine[pSpine_PointIdx]) ^ (pSpine[pSpine_PointIdx - 1] - pSpine[pSpine_PointIdx]);
        // if taken spine vectors are collinear then use previous vector Z.
        if (tvec.Equal(zero_vec)) tvec = pVecZ_Prev;
    }

    // After determining the Z-axis, its dot product with the Z-axis of the previous spine point is computed. If this value is negative, the Z-axis
    // is flipped (multiplied by -1).
    if ((tvec * pVecZ_Prev) < 0) tvec = -tvec;

    return tvec.Normalize();
}

// <Extrusion
// DEF=""                                 ID
// USE=""                                 IDREF
// beginCap="true"                        SFBool     [initializeOnly]
// ccw="true"                             SFBool     [initializeOnly]
// convex="true"                          SFBool     [initializeOnly]
// creaseAngle="0.0"                      SFloat     [initializeOnly]
// crossSection="1 1 1 -1 -1 -1 -1 1 1 1" MFVec2f    [initializeOnly]
// endCap="true"                          SFBool     [initializeOnly]
// orientation="0 0 1 0"                  MFRotation [initializeOnly]
// scale="1 1"                            MFVec2f    [initializeOnly]
// solid="true"                           SFBool     [initializeOnly]
// spine="0 0 0 0 1 0"                    MFVec3f    [initializeOnly]
// />
void X3DImporter::ParseNode_Geometry3D_Extrusion() {
    std::string use, def;
    bool beginCap = true;
    bool ccw = true;
    bool convex = true;
    float creaseAngle = 0;
    std::vector<aiVector2D> crossSection;
    bool endCap = true;
    std::vector<float> orientation;
    std::vector<aiVector2D> scale;
    bool solid = true;
    std::vector<aiVector3D> spine;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("beginCap", beginCap, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("ccw", ccw, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("convex", convex, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("creaseAngle", creaseAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("crossSection", crossSection, XML_ReadNode_GetAttrVal_AsArrVec2f);
    MACRO_ATTRREAD_CHECK_RET("endCap", endCap, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_REF("orientation", orientation, XML_ReadNode_GetAttrVal_AsArrF);
    MACRO_ATTRREAD_CHECK_REF("scale", scale, XML_ReadNode_GetAttrVal_AsArrVec2f);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_REF("spine", spine, XML_ReadNode_GetAttrVal_AsArrVec3f);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Extrusion, ne);
    } else {
        //
        // check if default values must be assigned
        //
        if (spine.size() == 0) {
            spine.resize(2);
            spine[0].Set(0, 0, 0), spine[1].Set(0, 1, 0);
        } else if (spine.size() == 1) {
            throw DeadlyImportError("ParseNode_Geometry3D_Extrusion. Spine must have at least two points.");
        }

        if (crossSection.size() == 0) {
            crossSection.resize(5);
            crossSection[0].Set(1, 1), crossSection[1].Set(1, -1), crossSection[2].Set(-1, -1), crossSection[3].Set(-1, 1), crossSection[4].Set(1, 1);
        }

        { // orientation
            size_t ori_size = orientation.size() / 4;

            if (ori_size < spine.size()) {
                float add_ori[4]; // values that will be added

                if (ori_size == 1) // if "orientation" has one element(means one MFRotation with four components) then use it value for all spine points.
                {
                    add_ori[0] = orientation[0], add_ori[1] = orientation[1], add_ori[2] = orientation[2], add_ori[3] = orientation[3];
                } else // else - use default values
                {
                    add_ori[0] = 0, add_ori[1] = 0, add_ori[2] = 1, add_ori[3] = 0;
                }

                orientation.reserve(spine.size() * 4);
                for (size_t i = 0, i_e = (spine.size() - ori_size); i < i_e; i++)
                    orientation.push_back(add_ori[0]), orientation.push_back(add_ori[1]), orientation.push_back(add_ori[2]), orientation.push_back(add_ori[3]);
            }

            if (orientation.size() % 4) throw DeadlyImportError("Attribute \"orientation\" in <Extrusion> must has multiple four quantity of numbers.");
        } // END: orientation

        { // scale
            if (scale.size() < spine.size()) {
                aiVector2D add_sc;

                if (scale.size() == 1) // if "scale" has one element then use it value for all spine points.
                    add_sc = scale[0];
                else // else - use default values
                    add_sc.Set(1, 1);

                scale.reserve(spine.size());
                for (size_t i = 0, i_e = (spine.size() - scale.size()); i < i_e; i++)
                    scale.push_back(add_sc);
            }
        } // END: scale
        //
        // create and if needed - define new geometry object.
        //
        ne = new CX3DImporter_NodeElement_IndexedSet(CX3DImporter_NodeElement::ENET_Extrusion, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        CX3DImporter_NodeElement_IndexedSet &ext_alias = *((CX3DImporter_NodeElement_IndexedSet *)ne); // create alias for conveience
        // assign part of input data
        ext_alias.CCW = ccw;
        ext_alias.Convex = convex;
        ext_alias.CreaseAngle = creaseAngle;
        ext_alias.Solid = solid;

        //
        // How we done it at all?
        // 1. At first we will calculate array of basises for every point in spine(look SCP in ISO-dic). Also "orientation" vector
        // are applied vor every basis.
        // 2. After that we can create array of point sets: which are scaled, transferred to basis of relative basis and at final translated to real position
        // using relative spine point.
        // 3. Next step is creating CoordIdx array(do not forget "-1" delimiter). While creating CoordIdx also created faces for begin and end caps, if
        // needed. While createing CootdIdx is taking in account CCW flag.
        // 4. The last step: create Vertices list.
        //
        bool spine_closed; // flag: true if spine curve is closed.
        bool cross_closed; // flag: true if cross curve is closed.
        std::vector<aiMatrix3x3> basis_arr; // array of basises. ROW_a - X, ROW_b - Y, ROW_c - Z.
        std::vector<std::vector<aiVector3D>> pointset_arr; // array of point sets: cross curves.

        // detect closed curves
        GeometryHelper_Extrusion_CurveIsClosed(crossSection, true, true, cross_closed); // true - drop tail, true - remove duplicate end.
        GeometryHelper_Extrusion_CurveIsClosed(spine, true, true, spine_closed); // true - drop tail, true - remove duplicate end.
        // If both cap are requested and spine curve is closed then we can make only one cap. Because second cap will be the same surface.
        if (spine_closed) {
            beginCap |= endCap;
            endCap = false;
        }

        { // 1. Calculate array of basises.
            aiMatrix4x4 rotmat;
            aiVector3D vecX(0), vecY(0), vecZ(0);

            basis_arr.resize(spine.size());
            for (size_t i = 0, i_e = spine.size(); i < i_e; i++) {
                aiVector3D tvec;

                // get axises of basis.
                vecY = GeometryHelper_Extrusion_GetNextY(i, spine, spine_closed);
                vecZ = GeometryHelper_Extrusion_GetNextZ(i, spine, spine_closed, vecZ);
                vecX = (vecY ^ vecZ).Normalize();
                // get rotation matrix and apply "orientation" to basis
                aiMatrix4x4::Rotation(orientation[i * 4 + 3], aiVector3D(orientation[i * 4], orientation[i * 4 + 1], orientation[i * 4 + 2]), rotmat);
                tvec = vecX, tvec *= rotmat, basis_arr[i].a1 = tvec.x, basis_arr[i].a2 = tvec.y, basis_arr[i].a3 = tvec.z;
                tvec = vecY, tvec *= rotmat, basis_arr[i].b1 = tvec.x, basis_arr[i].b2 = tvec.y, basis_arr[i].b3 = tvec.z;
                tvec = vecZ, tvec *= rotmat, basis_arr[i].c1 = tvec.x, basis_arr[i].c2 = tvec.y, basis_arr[i].c3 = tvec.z;
            } // for(size_t i = 0, i_e = spine.size(); i < i_e; i++)
        } // END: 1. Calculate array of basises

        { // 2. Create array of point sets.
            aiMatrix4x4 scmat;
            std::vector<aiVector3D> tcross(crossSection.size());

            pointset_arr.resize(spine.size());
            for (size_t spi = 0, spi_e = spine.size(); spi < spi_e; spi++) {
                aiVector3D tc23vec;

                tc23vec.Set(scale[spi].x, 0, scale[spi].y);
                aiMatrix4x4::Scaling(tc23vec, scmat);
                for (size_t cri = 0, cri_e = crossSection.size(); cri < cri_e; cri++) {
                    aiVector3D tvecX, tvecY, tvecZ;

                    tc23vec.Set(crossSection[cri].x, 0, crossSection[cri].y);
                    // apply scaling to point
                    tcross[cri] = scmat * tc23vec;
                    //
                    // transfer point to new basis
                    // calculate coordinate in new basis
                    tvecX.Set(basis_arr[spi].a1, basis_arr[spi].a2, basis_arr[spi].a3), tvecX *= tcross[cri].x;
                    tvecY.Set(basis_arr[spi].b1, basis_arr[spi].b2, basis_arr[spi].b3), tvecY *= tcross[cri].y;
                    tvecZ.Set(basis_arr[spi].c1, basis_arr[spi].c2, basis_arr[spi].c3), tvecZ *= tcross[cri].z;
                    // apply new coordinates and translate it to spine point.
                    tcross[cri] = tvecX + tvecY + tvecZ + spine[spi];
                } // for(size_t cri = 0, cri_e = crossSection.size(); cri < cri_e; i++)

                pointset_arr[spi] = tcross; // store transferred point set
            } // for(size_t spi = 0, spi_e = spine.size(); spi < spi_e; i++)
        } // END: 2. Create array of point sets.

        { // 3. Create CoordIdx.
            // add caps if needed
            if (beginCap) {
                // add cap as polygon. vertices of cap are places at begin, so just add numbers from zero.
                for (size_t i = 0, i_e = crossSection.size(); i < i_e; i++)
                    ext_alias.CoordIndex.push_back(static_cast<int32_t>(i));

                // add delimiter
                ext_alias.CoordIndex.push_back(-1);
            } // if(beginCap)

            if (endCap) {
                // add cap as polygon. vertices of cap are places at end, as for beginCap use just sequence of numbers but with offset.
                size_t beg = (pointset_arr.size() - 1) * crossSection.size();

                for (size_t i = beg, i_e = (beg + crossSection.size()); i < i_e; i++)
                    ext_alias.CoordIndex.push_back(static_cast<int32_t>(i));

                // add delimiter
                ext_alias.CoordIndex.push_back(-1);
            } // if(beginCap)

            // add quads
            for (size_t spi = 0, spi_e = (spine.size() - 1); spi <= spi_e; spi++) {
                const size_t cr_sz = crossSection.size();
                const size_t cr_last = crossSection.size() - 1;

                size_t right_col; // hold index basis for points of quad placed in right column;

                if (spi != spi_e)
                    right_col = spi + 1;
                else if (spine_closed) // if spine curve is closed then one more quad is needed: between first and last points of curve.
                    right_col = 0;
                else
                    break; // if spine curve is not closed then break the loop, because spi is out of range for that type of spine.

                for (size_t cri = 0; cri < cr_sz; cri++) {
                    if (cri != cr_last) {
                        MACRO_FACE_ADD_QUAD(ccw, ext_alias.CoordIndex,
                                static_cast<int32_t>(spi * cr_sz + cri),
                                static_cast<int32_t>(right_col * cr_sz + cri),
                                static_cast<int32_t>(right_col * cr_sz + cri + 1),
                                static_cast<int32_t>(spi * cr_sz + cri + 1));
                        // add delimiter
                        ext_alias.CoordIndex.push_back(-1);
                    } else if (cross_closed) // if cross curve is closed then one more quad is needed: between first and last points of curve.
                    {
                        MACRO_FACE_ADD_QUAD(ccw, ext_alias.CoordIndex,
                                static_cast<int32_t>(spi * cr_sz + cri),
                                static_cast<int32_t>(right_col * cr_sz + cri),
                                static_cast<int32_t>(right_col * cr_sz + 0),
                                static_cast<int32_t>(spi * cr_sz + 0));
                        // add delimiter
                        ext_alias.CoordIndex.push_back(-1);
                    }
                } // for(size_t cri = 0; cri < cr_sz; cri++)
            } // for(size_t spi = 0, spi_e = (spine.size() - 2); spi < spi_e; spi++)
        } // END: 3. Create CoordIdx.

        { // 4. Create vertices list.
            // just copy all vertices
            for (size_t spi = 0, spi_e = spine.size(); spi < spi_e; spi++) {
                for (size_t cri = 0, cri_e = crossSection.size(); cri < cri_e; cri++) {
                    ext_alias.Vertices.push_back(pointset_arr[spi][cri]);
                }
            }
        } // END: 4. Create vertices list.
        //PrintVectorSet("Ext. CoordIdx", ext_alias.CoordIndex);
        //PrintVectorSet("Ext. Vertices", ext_alias.Vertices);
        // check for child nodes
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Extrusion");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <IndexedFaceSet
// DEF=""                         ID
// USE=""                         IDREF
// ccw="true"             SFBool  [initializeOnly]
// colorIndex=""          MFInt32 [initializeOnly]
// colorPerVertex="true"  SFBool  [initializeOnly]
// convex="true"          SFBool  [initializeOnly]
// coordIndex=""          MFInt32 [initializeOnly]
// creaseAngle="0"        SFFloat [initializeOnly]
// normalIndex=""         MFInt32 [initializeOnly]
// normalPerVertex="true" SFBool  [initializeOnly]
// solid="true"           SFBool  [initializeOnly]
// texCoordIndex=""       MFInt32 [initializeOnly]
// >
//    <!-- ComposedGeometryContentModel -->
// ComposedGeometryContentModel is the child-node content model corresponding to X3DComposedGeometryNodes. It can contain Color (or ColorRGBA), Coordinate,
// Normal and TextureCoordinate, in any order. No more than one instance of these nodes is allowed. Multiple VertexAttribute (FloatVertexAttribute,
// Matrix3VertexAttribute, Matrix4VertexAttribute) nodes can also be contained.
// A ProtoInstance node (with the proper node type) can be substituted for any node in this content model.
// </IndexedFaceSet>
void X3DImporter::ParseNode_Geometry3D_IndexedFaceSet() {
    std::string use, def;
    bool ccw = true;
    std::vector<int32_t> colorIndex;
    bool colorPerVertex = true;
    bool convex = true;
    std::vector<int32_t> coordIndex;
    float creaseAngle = 0;
    std::vector<int32_t> normalIndex;
    bool normalPerVertex = true;
    bool solid = true;
    std::vector<int32_t> texCoordIndex;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("ccw", ccw, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_REF("colorIndex", colorIndex, XML_ReadNode_GetAttrVal_AsArrI32);
    MACRO_ATTRREAD_CHECK_RET("colorPerVertex", colorPerVertex, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("convex", convex, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_REF("coordIndex", coordIndex, XML_ReadNode_GetAttrVal_AsArrI32);
    MACRO_ATTRREAD_CHECK_RET("creaseAngle", creaseAngle, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_REF("normalIndex", normalIndex, XML_ReadNode_GetAttrVal_AsArrI32);
    MACRO_ATTRREAD_CHECK_RET("normalPerVertex", normalPerVertex, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_CHECK_REF("texCoordIndex", texCoordIndex, XML_ReadNode_GetAttrVal_AsArrI32);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_IndexedFaceSet, ne);
    } else {
        // check data
        if (coordIndex.size() == 0) throw DeadlyImportError("IndexedFaceSet must contain not empty \"coordIndex\" attribute.");

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_IndexedSet(CX3DImporter_NodeElement::ENET_IndexedFaceSet, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        CX3DImporter_NodeElement_IndexedSet &ne_alias = *((CX3DImporter_NodeElement_IndexedSet *)ne);

        ne_alias.CCW = ccw;
        ne_alias.ColorIndex = colorIndex;
        ne_alias.ColorPerVertex = colorPerVertex;
        ne_alias.Convex = convex;
        ne_alias.CoordIndex = coordIndex;
        ne_alias.CreaseAngle = creaseAngle;
        ne_alias.NormalIndex = normalIndex;
        ne_alias.NormalPerVertex = normalPerVertex;
        ne_alias.Solid = solid;
        ne_alias.TexCoordIndex = texCoordIndex;
        // check for child nodes
        if (!mReader->isEmptyElement()) {
            ParseHelper_Node_Enter(ne);
            MACRO_NODECHECK_LOOPBEGIN("IndexedFaceSet");
            // check for X3DComposedGeometryNodes
            if (XML_CheckNode_NameEqual("Color")) {
                ParseNode_Rendering_Color();
                continue;
            }
            if (XML_CheckNode_NameEqual("ColorRGBA")) {
                ParseNode_Rendering_ColorRGBA();
                continue;
            }
            if (XML_CheckNode_NameEqual("Coordinate")) {
                ParseNode_Rendering_Coordinate();
                continue;
            }
            if (XML_CheckNode_NameEqual("Normal")) {
                ParseNode_Rendering_Normal();
                continue;
            }
            if (XML_CheckNode_NameEqual("TextureCoordinate")) {
                ParseNode_Texturing_TextureCoordinate();
                continue;
            }
            // check for X3DMetadataObject
            if (!ParseHelper_CheckRead_X3DMetadataObject()) XML_CheckNode_SkipUnsupported("IndexedFaceSet");

            MACRO_NODECHECK_LOOPEND("IndexedFaceSet");
            ParseHelper_Node_Exit();
        } // if(!mReader->isEmptyElement())
        else {
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element
        }

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}

// <Sphere
// DEF=""       ID
// USE=""       IDREF
// radius="1"   SFloat [initializeOnly]
// solid="true" SFBool [initializeOnly]
// />
void X3DImporter::ParseNode_Geometry3D_Sphere() {
    std::string use, def;
    ai_real radius = 1;
    bool solid = true;
    CX3DImporter_NodeElement *ne(nullptr);

    MACRO_ATTRREAD_LOOPBEG;
    MACRO_ATTRREAD_CHECKUSEDEF_RET(def, use);
    MACRO_ATTRREAD_CHECK_RET("radius", radius, XML_ReadNode_GetAttrVal_AsFloat);
    MACRO_ATTRREAD_CHECK_RET("solid", solid, XML_ReadNode_GetAttrVal_AsBool);
    MACRO_ATTRREAD_LOOPEND;

    // if "USE" defined then find already defined element.
    if (!use.empty()) {
        MACRO_USE_CHECKANDAPPLY(def, use, ENET_Sphere, ne);
    } else {
        const unsigned int tess = 3; ///TODO: IME tessellation factor through ai_property

        std::vector<aiVector3D> tlist;

        // create and if needed - define new geometry object.
        ne = new CX3DImporter_NodeElement_Geometry3D(CX3DImporter_NodeElement::ENET_Sphere, NodeElement_Cur);
        if (!def.empty()) ne->ID = def;

        StandardShapes::MakeSphere(tess, tlist);
        // copy data from temp array and apply scale
        for (std::vector<aiVector3D>::iterator it = tlist.begin(); it != tlist.end(); ++it) {
            ((CX3DImporter_NodeElement_Geometry3D *)ne)->Vertices.push_back(*it * radius);
        }

        ((CX3DImporter_NodeElement_Geometry3D *)ne)->Solid = solid;
        ((CX3DImporter_NodeElement_Geometry3D *)ne)->NumIndices = 3;
        // check for X3DMetadataObject childs.
        if (!mReader->isEmptyElement())
            ParseNode_Metadata(ne, "Sphere");
        else
            NodeElement_Cur->Child.push_back(ne); // add made object as child to current element

        NodeElement_List.push_back(ne); // add element to node element list because its a new object in graph
    } // if(!use.empty()) else
}



void X3DImporter::readMetadataObject(XmlNode &node) {
    const std::string &name = node.name();
    if (name == "MetadataBoolean") {
        readMetadataBoolean(node, mNodeElementCur);
    } else if (name == "MetadataDouble") {
        readMetadataDouble(node, mNodeElementCur);
    } else if (name == "MetadataFloat") {
        readMetadataFloat(node, mNodeElementCur);
    } else if (name == "MetadataInteger") {
        readMetadataInteger(node, mNodeElementCur);
    } else if (name == "MetadataSet") {
        readMetadataSet(node, mNodeElementCur);
    } else if (name == "MetadataString") {
        readMetadataString(node, mNodeElementCur);
    }
}


aiMatrix4x4 PostprocessHelper_Matrix_GlobalToCurrent() {
    X3DNodeElementBase *cur_node = nullptr;
    std::list<aiMatrix4x4> matr;
    aiMatrix4x4 out_matr;

    // starting walk from current element to root
    cur_node = cur_node;
    if (cur_node != nullptr) {
        do {
            // if cur_node is group then store group transformation matrix in list.
            if (cur_node->Type == X3DNodeElementBase::ENET_Group) matr.push_back(((X3DNodeElementBase *)cur_node)->Transformation);

            cur_node = cur_node->Parent;
        } while (cur_node != nullptr);
    }

    // multiplicate all matrices in reverse order
    for (std::list<aiMatrix4x4>::reverse_iterator rit = matr.rbegin(); rit != matr.rend(); ++rit)
        out_matr = out_matr * (*rit);

    return out_matr;
}

void X3DImporter::PostprocessHelper_CollectMetadata(const CX3DImporter_NodeElement &pNodeElement, std::list<X3DNodeElementBase *> &pList) const {
    // walk through childs and find for metadata.
    for (std::list<X3DNodeElementBase *>::const_iterator el_it = pNodeElement.Child.begin(); el_it != pNodeElement.Child.end(); ++el_it) {
        if (((*el_it)->Type == X3DElemType::ENET_MetaBoolean) || ((*el_it)->Type == X3DElemType::ENET_MetaDouble) ||
                ((*el_it)->Type == X3DElemType::ENET_MetaFloat) || ((*el_it)->Type == X3DElemType::ENET_MetaInteger) ||
                ((*el_it)->Type == X3DElemType::ENET_MetaString)) {
            pList.push_back(*el_it);
        } else if ((*el_it)->Type == X3DElemType::ENET_MetaSet) {
            PostprocessHelper_CollectMetadata(**el_it, pList);
        }
    } // for(std::list<CX3DImporter_NodeElement*>::const_iterator el_it = pNodeElement.Child.begin(); el_it != pNodeElement.Child.end(); el_it++)
}

bool X3DImporter::PostprocessHelper_ElementIsMetadata(const CX3DImporter_NodeElement::EType pType) const {
    if ((pType == X3DNodeElementBase::ENET_MetaBoolean) || (pType == X3DElemType::ENET_MetaDouble) ||
            (pType == X3DElemType::ENET_MetaFloat) || (pType == X3DElemType::ENET_MetaInteger) ||
            (pType == X3DElemType::ENET_MetaString) || (pType == X3DElemType::ENET_MetaSet)) {
        return true;
    }
    return false;
}

bool X3DImporter::PostprocessHelper_ElementIsMesh(const CX3DImporter_NodeElement::EType pType) const {
    if ((pType == X3DElemType::ENET_Arc2D) || (pType == X3DElemType::ENET_ArcClose2D) ||
            (pType == X3DElemType::ENET_Box) || (pType == X3DElemType::ENET_Circle2D) ||
            (pType == X3DElemType::ENET_Cone) || (pType == X3DElemType::ENET_Cylinder) ||
            (pType == X3DElemType::ENET_Disk2D) || (pType == X3DElemType::ENET_ElevationGrid) ||
            (pType == X3DElemType::ENET_Extrusion) || (pType == X3DElemType::ENET_IndexedFaceSet) ||
            (pType == X3DElemType::ENET_IndexedLineSet) || (pType == X3DElemType::ENET_IndexedTriangleFanSet) ||
            (pType == X3DElemType::ENET_IndexedTriangleSet) || (pType == X3DElemType::ENET_IndexedTriangleStripSet) ||
            (pType == X3DElemType::ENET_PointSet) || (pType == X3DElemType::ENET_LineSet) ||
            (pType == X3DElemType::ENET_Polyline2D) || (pType == X3DElemType::ENET_Polypoint2D) ||
            (pType == X3DElemType::ENET_Rectangle2D) || (pType == X3DElemType::ENET_Sphere) ||
            (pType == X3DElemType::ENET_TriangleFanSet) || (pType == X3DElemType::ENET_TriangleSet) ||
            (pType == X3DElemType::ENET_TriangleSet2D) || (pType == X3DElemType::ENET_TriangleStripSet)) {
        return true;
    } else {
        return false;
    }
}

void X3DImporter::Postprocess_BuildLight(const CX3DImporter_NodeElement &pNodeElement, std::list<aiLight *> &pSceneLightList) const {
    const CX3DImporter_NodeElement_Light &ne = *((CX3DImporter_NodeElement_Light *)&pNodeElement);
    aiMatrix4x4 transform_matr = PostprocessHelper_Matrix_GlobalToCurrent();
    aiLight *new_light = new aiLight;

    new_light->mName = ne.ID;
    new_light->mColorAmbient = ne.Color * ne.AmbientIntensity;
    new_light->mColorDiffuse = ne.Color * ne.Intensity;
    new_light->mColorSpecular = ne.Color * ne.Intensity;
    switch (pNodeElement.Type) {
    case CX3DImporter_NodeElement::ENET_DirectionalLight:
        new_light->mType = aiLightSource_DIRECTIONAL;
        new_light->mDirection = ne.Direction, new_light->mDirection *= transform_matr;

        break;
    case CX3DImporter_NodeElement::ENET_PointLight:
        new_light->mType = aiLightSource_POINT;
        new_light->mPosition = ne.Location, new_light->mPosition *= transform_matr;
        new_light->mAttenuationConstant = ne.Attenuation.x;
        new_light->mAttenuationLinear = ne.Attenuation.y;
        new_light->mAttenuationQuadratic = ne.Attenuation.z;

        break;
    case CX3DImporter_NodeElement::ENET_SpotLight:
        new_light->mType = aiLightSource_SPOT;
        new_light->mPosition = ne.Location, new_light->mPosition *= transform_matr;
        new_light->mDirection = ne.Direction, new_light->mDirection *= transform_matr;
        new_light->mAttenuationConstant = ne.Attenuation.x;
        new_light->mAttenuationLinear = ne.Attenuation.y;
        new_light->mAttenuationQuadratic = ne.Attenuation.z;
        new_light->mAngleInnerCone = ne.BeamWidth;
        new_light->mAngleOuterCone = ne.CutOffAngle;

        break;
    default:
        throw DeadlyImportError("Postprocess_BuildLight. Unknown type of light: " + to_string(pNodeElement.Type) + ".");
    }

    pSceneLightList.push_back(new_light);
}

void X3DImporter::Postprocess_BuildMaterial(const CX3DImporter_NodeElement &pNodeElement, aiMaterial **pMaterial) const {
    // check argument
    if (pMaterial == nullptr) throw DeadlyImportError("Postprocess_BuildMaterial. pMaterial is nullptr.");
    if (*pMaterial != nullptr) throw DeadlyImportError("Postprocess_BuildMaterial. *pMaterial must be nullptr.");

    *pMaterial = new aiMaterial;
    aiMaterial &taimat = **pMaterial; // creating alias for convenience.

    // at this point pNodeElement point to <Appearance> node. Walk through childs and add all stored data.
    for (std::list<CX3DImporter_NodeElement *>::const_iterator el_it = pNodeElement.Child.begin(); el_it != pNodeElement.Child.end(); ++el_it) {
        if ((*el_it)->Type == CX3DImporter_NodeElement::ENET_Material) {
            aiColor3D tcol3;
            float tvalf;
            CX3DImporter_NodeElement_Material &tnemat = *((CX3DImporter_NodeElement_Material *)*el_it);

            tcol3.r = tnemat.AmbientIntensity, tcol3.g = tnemat.AmbientIntensity, tcol3.b = tnemat.AmbientIntensity;
            taimat.AddProperty(&tcol3, 1, AI_MATKEY_COLOR_AMBIENT);
            taimat.AddProperty(&tnemat.DiffuseColor, 1, AI_MATKEY_COLOR_DIFFUSE);
            taimat.AddProperty(&tnemat.EmissiveColor, 1, AI_MATKEY_COLOR_EMISSIVE);
            taimat.AddProperty(&tnemat.SpecularColor, 1, AI_MATKEY_COLOR_SPECULAR);
            tvalf = 1;
            taimat.AddProperty(&tvalf, 1, AI_MATKEY_SHININESS_STRENGTH);
            taimat.AddProperty(&tnemat.Shininess, 1, AI_MATKEY_SHININESS);
            tvalf = 1.0f - tnemat.Transparency;
            taimat.AddProperty(&tvalf, 1, AI_MATKEY_OPACITY);
        } // if((*el_it)->Type == CX3DImporter_NodeElement::ENET_Material)
        else if ((*el_it)->Type == CX3DImporter_NodeElement::ENET_ImageTexture) {
            CX3DImporter_NodeElement_ImageTexture &tnetex = *((CX3DImporter_NodeElement_ImageTexture *)*el_it);
            aiString url_str(tnetex.URL.c_str());
            int mode = aiTextureOp_Multiply;

            taimat.AddProperty(&url_str, AI_MATKEY_TEXTURE_DIFFUSE(0));
            taimat.AddProperty(&tnetex.RepeatS, 1, AI_MATKEY_MAPPINGMODE_U_DIFFUSE(0));
            taimat.AddProperty(&tnetex.RepeatT, 1, AI_MATKEY_MAPPINGMODE_V_DIFFUSE(0));
            taimat.AddProperty(&mode, 1, AI_MATKEY_TEXOP_DIFFUSE(0));
        } // else if((*el_it)->Type == CX3DImporter_NodeElement::ENET_ImageTexture)
        else if ((*el_it)->Type == CX3DImporter_NodeElement::ENET_TextureTransform) {
            aiUVTransform trans;
            CX3DImporter_NodeElement_TextureTransform &tnetextr = *((CX3DImporter_NodeElement_TextureTransform *)*el_it);

            trans.mTranslation = tnetextr.Translation - tnetextr.Center;
            trans.mScaling = tnetextr.Scale;
            trans.mRotation = tnetextr.Rotation;
            taimat.AddProperty(&trans, 1, AI_MATKEY_UVTRANSFORM_DIFFUSE(0));
        } // else if((*el_it)->Type == CX3DImporter_NodeElement::ENET_TextureTransform)
    } // for(std::list<CX3DImporter_NodeElement*>::const_iterator el_it = pNodeElement.Child.begin(); el_it != pNodeElement.Child.end(); el_it++)
}

void X3DImporter::Postprocess_BuildMesh(const CX3DImporter_NodeElement &pNodeElement, aiMesh **pMesh) const {
    // check argument
    if (pMesh == nullptr) throw DeadlyImportError("Postprocess_BuildMesh. pMesh is nullptr.");
    if (*pMesh != nullptr) throw DeadlyImportError("Postprocess_BuildMesh. *pMesh must be nullptr.");

    /************************************************************************************************************************************/
    /************************************************************ Geometry2D ************************************************************/
    /************************************************************************************************************************************/
    if ((pNodeElement.Type == CX3DImporter_NodeElement::ENET_Arc2D) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_ArcClose2D) ||
            (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Circle2D) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Disk2D) ||
            (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Polyline2D) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Polypoint2D) ||
            (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Rectangle2D) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleSet2D)) {
        CX3DImporter_NodeElement_Geometry2D &tnemesh = *((CX3DImporter_NodeElement_Geometry2D *)&pNodeElement); // create alias for convenience
        std::vector<aiVector3D> tarr;

        tarr.reserve(tnemesh.Vertices.size());
        for (std::list<aiVector3D>::iterator it = tnemesh.Vertices.begin(); it != tnemesh.Vertices.end(); ++it)
            tarr.push_back(*it);
        *pMesh = StandardShapes::MakeMesh(tarr, static_cast<unsigned int>(tnemesh.NumIndices)); // create mesh from vertices using Assimp help.

        return; // mesh is build, nothing to do anymore.
    }
    /************************************************************************************************************************************/
    /************************************************************ Geometry3D ************************************************************/
    /************************************************************************************************************************************/
    //
    // Predefined figures
    //
    if ((pNodeElement.Type == CX3DImporter_NodeElement::ENET_Box) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Cone) ||
            (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Cylinder) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Sphere)) {
        CX3DImporter_NodeElement_Geometry3D &tnemesh = *((CX3DImporter_NodeElement_Geometry3D *)&pNodeElement); // create alias for convenience
        std::vector<aiVector3D> tarr;

        tarr.reserve(tnemesh.Vertices.size());
        for (std::list<aiVector3D>::iterator it = tnemesh.Vertices.begin(); it != tnemesh.Vertices.end(); ++it)
            tarr.push_back(*it);

        *pMesh = StandardShapes::MakeMesh(tarr, static_cast<unsigned int>(tnemesh.NumIndices)); // create mesh from vertices using Assimp help.

        return; // mesh is build, nothing to do anymore.
    }
    //
    // Parametric figures
    //
    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_ElevationGrid) {
        CX3DImporter_NodeElement_ElevationGrid &tnemesh = *((CX3DImporter_NodeElement_ElevationGrid *)&pNodeElement); // create alias for convenience

        // at first create mesh from existing vertices.
        *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIdx, tnemesh.Vertices);
        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Normal)
                MeshGeometry_AddNormal(**pMesh, ((CX3DImporter_NodeElement_Normal *)*ch_it)->Value, tnemesh.NormalPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_TextureCoordinate)
                MeshGeometry_AddTexCoord(**pMesh, ((CX3DImporter_NodeElement_TextureCoordinate *)*ch_it)->Value);
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of ElevationGrid: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_ElevationGrid)
    //
    // Indexed primitives sets
    //
    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedFaceSet) {
        CX3DImporter_NodeElement_IndexedSet &tnemesh = *((CX3DImporter_NodeElement_IndexedSet *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, tnemesh.CoordIndex, tnemesh.ColorIndex, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, tnemesh.CoordIndex, tnemesh.ColorIndex, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value,
                        tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Normal)
                MeshGeometry_AddNormal(**pMesh, tnemesh.CoordIndex, tnemesh.NormalIndex, ((CX3DImporter_NodeElement_Normal *)*ch_it)->Value,
                        tnemesh.NormalPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_TextureCoordinate)
                MeshGeometry_AddTexCoord(**pMesh, tnemesh.CoordIndex, tnemesh.TexCoordIndex, ((CX3DImporter_NodeElement_TextureCoordinate *)*ch_it)->Value);
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of IndexedFaceSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedFaceSet)

    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedLineSet) {
        CX3DImporter_NodeElement_IndexedSet &tnemesh = *((CX3DImporter_NodeElement_IndexedSet *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            ai_assert(*pMesh);
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, tnemesh.CoordIndex, tnemesh.ColorIndex, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, tnemesh.CoordIndex, tnemesh.ColorIndex, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value,
                        tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of IndexedLineSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedLineSet)

    if ((pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedTriangleSet) ||
            (pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedTriangleFanSet) ||
            (pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedTriangleStripSet)) {
        CX3DImporter_NodeElement_IndexedSet &tnemesh = *((CX3DImporter_NodeElement_IndexedSet *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            ai_assert(*pMesh);
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, tnemesh.CoordIndex, tnemesh.ColorIndex, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, tnemesh.CoordIndex, tnemesh.ColorIndex, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value,
                        tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Normal)
                MeshGeometry_AddNormal(**pMesh, tnemesh.CoordIndex, tnemesh.NormalIndex, ((CX3DImporter_NodeElement_Normal *)*ch_it)->Value,
                        tnemesh.NormalPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_TextureCoordinate)
                MeshGeometry_AddTexCoord(**pMesh, tnemesh.CoordIndex, tnemesh.TexCoordIndex, ((CX3DImporter_NodeElement_TextureCoordinate *)*ch_it)->Value);
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of IndexedTriangleSet or IndexedTriangleFanSet, or \
																	IndexedTriangleStripSet: " +
                                        to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if((pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedTriangleFanSet) || (pNodeElement.Type == CX3DImporter_NodeElement::ENET_IndexedTriangleStripSet))

    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_Extrusion) {
        CX3DImporter_NodeElement_IndexedSet &tnemesh = *((CX3DImporter_NodeElement_IndexedSet *)&pNodeElement); // create alias for convenience

        *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, tnemesh.Vertices);

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_Extrusion)

    //
    // Primitives sets
    //
    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_PointSet) {
        CX3DImporter_NodeElement_Set &tnemesh = *((CX3DImporter_NodeElement_Set *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                std::vector<aiVector3D> vec_copy;

                vec_copy.reserve(((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value.size());
                for (std::list<aiVector3D>::const_iterator it = ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value.begin();
                        it != ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value.end(); ++it) {
                    vec_copy.push_back(*it);
                }

                *pMesh = StandardShapes::MakeMesh(vec_copy, 1);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            ai_assert(*pMesh);
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, true);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value, true);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of PointSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_PointSet)

    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_LineSet) {
        CX3DImporter_NodeElement_Set &tnemesh = *((CX3DImporter_NodeElement_Set *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            ai_assert(*pMesh);
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, true);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value, true);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of LineSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_LineSet)

    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleFanSet) {
        CX3DImporter_NodeElement_Set &tnemesh = *((CX3DImporter_NodeElement_Set *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if (nullptr == *pMesh) {
                break;
            }
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Normal)
                MeshGeometry_AddNormal(**pMesh, tnemesh.CoordIndex, tnemesh.NormalIndex, ((CX3DImporter_NodeElement_Normal *)*ch_it)->Value,
                        tnemesh.NormalPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_TextureCoordinate)
                MeshGeometry_AddTexCoord(**pMesh, tnemesh.CoordIndex, tnemesh.TexCoordIndex, ((CX3DImporter_NodeElement_TextureCoordinate *)*ch_it)->Value);
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of TrianlgeFanSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleFanSet)

    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleSet) {
        CX3DImporter_NodeElement_Set &tnemesh = *((CX3DImporter_NodeElement_Set *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                std::vector<aiVector3D> vec_copy;

                vec_copy.reserve(((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value.size());
                for (std::list<aiVector3D>::const_iterator it = ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value.begin();
                        it != ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value.end(); ++it) {
                    vec_copy.push_back(*it);
                }

                *pMesh = StandardShapes::MakeMesh(vec_copy, 3);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            ai_assert(*pMesh);
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Normal)
                MeshGeometry_AddNormal(**pMesh, tnemesh.CoordIndex, tnemesh.NormalIndex, ((CX3DImporter_NodeElement_Normal *)*ch_it)->Value,
                        tnemesh.NormalPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_TextureCoordinate)
                MeshGeometry_AddTexCoord(**pMesh, tnemesh.CoordIndex, tnemesh.TexCoordIndex, ((CX3DImporter_NodeElement_TextureCoordinate *)*ch_it)->Value);
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of TrianlgeSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleSet)

    if (pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleStripSet) {
        CX3DImporter_NodeElement_Set &tnemesh = *((CX3DImporter_NodeElement_Set *)&pNodeElement); // create alias for convenience

        // at first search for <Coordinate> node and create mesh.
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
                *pMesh = GeometryHelper_MakeMesh(tnemesh.CoordIndex, ((CX3DImporter_NodeElement_Coordinate *)*ch_it)->Value);
            }
        }

        // copy additional information from children
        for (std::list<CX3DImporter_NodeElement *>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it) {
            ai_assert(*pMesh);
            if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Color)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_Color *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_ColorRGBA)
                MeshGeometry_AddColor(**pMesh, ((CX3DImporter_NodeElement_ColorRGBA *)*ch_it)->Value, tnemesh.ColorPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Coordinate) {
            } // skip because already read when mesh created.
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_Normal)
                MeshGeometry_AddNormal(**pMesh, tnemesh.CoordIndex, tnemesh.NormalIndex, ((CX3DImporter_NodeElement_Normal *)*ch_it)->Value,
                        tnemesh.NormalPerVertex);
            else if ((*ch_it)->Type == CX3DImporter_NodeElement::ENET_TextureCoordinate)
                MeshGeometry_AddTexCoord(**pMesh, tnemesh.CoordIndex, tnemesh.TexCoordIndex, ((CX3DImporter_NodeElement_TextureCoordinate *)*ch_it)->Value);
            else
                throw DeadlyImportError("Postprocess_BuildMesh. Unknown child of TriangleStripSet: " + to_string((*ch_it)->Type) + ".");
        } // for(std::list<CX3DImporter_NodeElement*>::iterator ch_it = tnemesh.Child.begin(); ch_it != tnemesh.Child.end(); ++ch_it)

        return; // mesh is build, nothing to do anymore.
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_TriangleStripSet)

    throw DeadlyImportError("Postprocess_BuildMesh. Unknown mesh type: " + to_string(pNodeElement.Type) + ".");
}

void X3DImporter::Postprocess_BuildNode(const X3DNodeElementBase &pNodeElement, aiNode &pSceneNode, std::list<aiMesh *> &pSceneMeshList,
        std::list<aiMaterial *> &pSceneMaterialList, std::list<aiLight *> &pSceneLightList) const {
    X3DElementList::const_iterator chit_begin = pNodeElement.Children.begin();
    X3DElementList::const_iterator chit_end = pNodeElement.Children.end();
    std::list<aiNode *> SceneNode_Child;
    std::list<unsigned int> SceneNode_Mesh;

    // At first read all metadata
    Postprocess_CollectMetadata(pNodeElement, pSceneNode);
    // check if we have deal with grouping node. Which can contain transformation or switch
    if (pNodeElement.Type == X3DElemType::ENET_Group) {
        const CX3DNodeElementGroup &tne_group = *((CX3DNodeElementGroup*)&pNodeElement); // create alias for convenience

        pSceneNode.mTransformation = tne_group.Transformation;
        if (tne_group.UseChoice) {
            // If Choice is less than zero or greater than the number of nodes in the children field, nothing is chosen.
            if ((tne_group.Choice < 0) || ((size_t)tne_group.Choice >= pNodeElement.Children.size())) {
                chit_begin = pNodeElement.Children.end();
                chit_end = pNodeElement.Children.end();
            } else {
                for (size_t i = 0; i < (size_t)tne_group.Choice; i++)
                    ++chit_begin; // forward iterator to chosen node.

                chit_end = chit_begin;
                ++chit_end; // point end iterator to next element after chosen node.
            }
        } // if(tne_group.UseChoice)
    } // if(pNodeElement.Type == CX3DImporter_NodeElement::ENET_Group)

    // Reserve memory for fast access and check children.
    for (std::list<X3DNodeElementBase *>::const_iterator it = chit_begin; it != chit_end; ++it) { // in this loop we do not read metadata because it's already read at begin.
        if ((*it)->Type == X3DElemType::ENET_Group) {
            // if child is group then create new node and do recursive call.
            aiNode *new_node = new aiNode;

            new_node->mName = (*it)->ID;
            new_node->mParent = &pSceneNode;
            SceneNode_Child.push_back(new_node);
            Postprocess_BuildNode(**it, *new_node, pSceneMeshList, pSceneMaterialList, pSceneLightList);
        } else if ((*it)->Type == X3DElemType::ENET_Shape) {
            // shape can contain only one geometry and one appearance nodes.
            Postprocess_BuildShape(*((CX3DImporter_NodeElement_Shape *)*it), SceneNode_Mesh, pSceneMeshList, pSceneMaterialList);
        } else if (((*it)->Type == X3DElemType::ENET_DirectionalLight) || ((*it)->Type == X3DElemType::ENET_PointLight) ||
                   ((*it)->Type == X3DElemType::ENET_SpotLight)) {
            Postprocess_BuildLight(*((X3DElemType *)*it), pSceneLightList);
        } else if (!PostprocessHelper_ElementIsMetadata((*it)->Type)) // skip metadata
        {
            throw DeadlyImportError("Postprocess_BuildNode. Unknown type: " + to_string((*it)->Type) + ".");
        }
    } // for(std::list<CX3DImporter_NodeElement*>::const_iterator it = chit_begin; it != chit_end; it++)

    // copy data about children and meshes to aiNode.
    if (!SceneNode_Child.empty()) {
        std::list<aiNode *>::const_iterator it = SceneNode_Child.begin();

        pSceneNode.mNumChildren = static_cast<unsigned int>(SceneNode_Child.size());
        pSceneNode.mChildren = new aiNode *[pSceneNode.mNumChildren];
        for (size_t i = 0; i < pSceneNode.mNumChildren; i++)
            pSceneNode.mChildren[i] = *it++;
    }

    if (!SceneNode_Mesh.empty()) {
        std::list<unsigned int>::const_iterator it = SceneNode_Mesh.begin();

        pSceneNode.mNumMeshes = static_cast<unsigned int>(SceneNode_Mesh.size());
        pSceneNode.mMeshes = new unsigned int[pSceneNode.mNumMeshes];
        for (size_t i = 0; i < pSceneNode.mNumMeshes; i++)
            pSceneNode.mMeshes[i] = *it++;
    }

    // that's all. return to previous deals
}

void X3DImporter::Postprocess_BuildShape(const CX3DImporter_NodeElement_Shape &pShapeNodeElement, std::list<unsigned int> &pNodeMeshInd,
        std::list<aiMesh *> &pSceneMeshList, std::list<aiMaterial *> &pSceneMaterialList) const {
    aiMaterial *tmat = nullptr;
    aiMesh *tmesh = nullptr;
    X3DElemType mesh_type = X3DElemType::ENET_Invalid;
    unsigned int mat_ind = 0;

    for (X3DElementList::const_iterator it = pShapeNodeElement.Children.begin(); it != pShapeNodeElement.Children.end(); ++it) {
        if (PostprocessHelper_ElementIsMesh((*it)->Type)) {
            Postprocess_BuildMesh(**it, &tmesh);
            if (tmesh != nullptr) {
                // if mesh successfully built then add data about it to arrays
                pNodeMeshInd.push_back(static_cast<unsigned int>(pSceneMeshList.size()));
                pSceneMeshList.push_back(tmesh);
                // keep mesh type. Need above for texture coordinate generation.
                mesh_type = (*it)->Type;
            }
        } else if ((*it)->Type == X3DElemType::ENET_Appearance) {
            Postprocess_BuildMaterial(**it, &tmat);
            if (tmat != nullptr) {
                // if material successfully built then add data about it to array
                mat_ind = static_cast<unsigned int>(pSceneMaterialList.size());
                pSceneMaterialList.push_back(tmat);
            }
        }
    } // for(std::list<CX3DImporter_NodeElement*>::const_iterator it = pShapeNodeElement.Child.begin(); it != pShapeNodeElement.Child.end(); it++)

    // associate read material with read mesh.
    if ((tmesh != nullptr) && (tmat != nullptr)) {
        tmesh->mMaterialIndex = mat_ind;
        // Check texture mapping. If material has texture but mesh has no texture coordinate then try to ask Assimp to generate texture coordinates.
        if ((tmat->GetTextureCount(aiTextureType_DIFFUSE) != 0) && !tmesh->HasTextureCoords(0)) {
            int32_t tm;
            aiVector3D tvec3;

            switch (mesh_type) {
            case X3DElemType::ENET_Box:
                tm = aiTextureMapping_BOX;
                break;
            case X3DElemType::ENET_Cone:
            case X3DElemType::ENET_Cylinder:
                tm = aiTextureMapping_CYLINDER;
                break;
            case X3DElemType::ENET_Sphere:
                tm = aiTextureMapping_SPHERE;
                break;
            default:
                tm = aiTextureMapping_PLANE;
                break;
            } // switch(mesh_type)

            tmat->AddProperty(&tm, 1, AI_MATKEY_MAPPING_DIFFUSE(0));
        } // if((tmat->GetTextureCount(aiTextureType_DIFFUSE) != 0) && !tmesh->HasTextureCoords(0))
    } // if((tmesh != nullptr) && (tmat != nullptr))
}

void X3DImporter::Postprocess_CollectMetadata(const CX3DImporter_NodeElement &pNodeElement, aiNode &pSceneNode) const {
    X3DElementList meta_list;
    size_t meta_idx;

    PostprocessHelper_CollectMetadata(pNodeElement, meta_list); // find metadata in current node element.
    if (!meta_list.empty()) {
        if (pSceneNode.mMetaData != nullptr) {
            throw DeadlyImportError("Postprocess. MetaData member in node are not nullptr. Something went wrong.");
        }

        // copy collected metadata to output node.
        pSceneNode.mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(meta_list.size()));
        meta_idx = 0;
        for (X3DElementList::const_iterator it = meta_list.begin(); it != meta_list.end(); ++it, ++meta_idx) {
            CX3DImporter_NodeElement_Meta *cur_meta = (CX3DImporter_NodeElement_Meta *)*it;

            // due to limitations we can add only first element of value list.
            // Add an element according to its type.
            if ((*it)->Type == CX3DImporter_NodeElement::ENET_MetaBoolean) {
                if (((CX3DImporter_NodeElement_MetaBoolean *)cur_meta)->Value.size() > 0)
                    pSceneNode.mMetaData->Set(static_cast<unsigned int>(meta_idx), cur_meta->Name, *(((CX3DImporter_NodeElement_MetaBoolean *)cur_meta)->Value.begin()));
            } else if ((*it)->Type == CX3DImporter_NodeElement::ENET_MetaDouble) {
                if (((CX3DImporter_NodeElement_MetaDouble *)cur_meta)->Value.size() > 0)
                    pSceneNode.mMetaData->Set(static_cast<unsigned int>(meta_idx), cur_meta->Name, (float)*(((CX3DImporter_NodeElement_MetaDouble *)cur_meta)->Value.begin()));
            } else if ((*it)->Type == CX3DImporter_NodeElement::ENET_MetaFloat) {
                if (((CX3DImporter_NodeElement_MetaFloat *)cur_meta)->Value.size() > 0)
                    pSceneNode.mMetaData->Set(static_cast<unsigned int>(meta_idx), cur_meta->Name, *(((CX3DImporter_NodeElement_MetaFloat *)cur_meta)->Value.begin()));
            } else if ((*it)->Type == CX3DImporter_NodeElement::ENET_MetaInteger) {
                if (((CX3DImporter_NodeElement_MetaInteger *)cur_meta)->Value.size() > 0)
                    pSceneNode.mMetaData->Set(static_cast<unsigned int>(meta_idx), cur_meta->Name, *(((CX3DImporter_NodeElement_MetaInteger *)cur_meta)->Value.begin()));
            } else if ((*it)->Type == CX3DImporter_NodeElement::ENET_MetaString) {
                if (((CX3DImporter_NodeElement_MetaString *)cur_meta)->Value.size() > 0) {
                    aiString tstr(((CX3DImporter_NodeElement_MetaString *)cur_meta)->Value.begin()->data());

                    pSceneNode.mMetaData->Set(static_cast<unsigned int>(meta_idx), cur_meta->Name, tstr);
                }
            } else {
                throw DeadlyImportError("Postprocess. Unknown metadata type.");
            } // if((*it)->Type == CX3DImporter_NodeElement::ENET_Meta*) else
        } // for(std::list<CX3DImporter_NodeElement*>::const_iterator it = meta_list.begin(); it != meta_list.end(); it++)
    } // if( !meta_list.empty() )
}

#endif // !ASSIMP_BUILD_NO_X3D_IMPORTER

} // namespace Assimp