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/// \file   X3DImporter_Geometry3D.cpp
/// \brief  Parsing data from nodes of "Geometry3D" set of X3D.
/// \date   2015-2016
/// \author smal.root@gmail.com

#ifndef ASSIMP_BUILD_NO_X3D_IMPORTER

#include "X3DImporter.hpp"
#include "X3DImporter_Macro.hpp"
#include "X3DXmlHelper.h"
#include "X3DGeoHelper.h"

// Header files, Assimp.
#include <assimp/StandardShapes.h>

namespace Assimp
{

// <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::readBox(XmlNode &node) {
    std::string def, use;
    bool solid = true;
    aiVector3D size(2, 2, 2);
    X3DNodeElementBase* ne( nullptr );

    MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    X3DXmlHelper::getVector3DAttribute(node, "size", size);
    XmlParser::getBoolAttribute(node, "solid", solid);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, def, use, ENET_Box, ne);
	}
	else
	{
		// create and if needed - define new geometry object.
		ne = new X3DNodeElementGeometry3D(X3DElemType::ENET_Box, mNodeElementCur);
		if(!def.empty()) ne->ID = def;

		X3DGeoHelper::rect_parallel_epiped(size, ((X3DNodeElementGeometry3D *)ne)->Vertices); // get quad list
        ((X3DNodeElementGeometry3D *)ne)->Solid = solid;
        ((X3DNodeElementGeometry3D *)ne)->NumIndices = 4;
		// check for X3DMetadataObject childs.
		if(!isNodeEmpty(node))
			childrenReadMetadata(node, ne, "Box");
		else
			mNodeElementCur->Children.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::readCone(XmlNode &node) {
    std::string use, def;
    bool bottom = true;
    float bottomRadius = 1;
    float height = 2;
    bool side = true;
    bool solid = true;
    X3DNodeElementBase* ne( nullptr );

	MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    XmlParser::getBoolAttribute(node, "solid", solid);
    XmlParser::getBoolAttribute(node, "side", side);
    XmlParser::getBoolAttribute(node, "bottom", bottom);
    XmlParser::getFloatAttribute(node, "height", height);
    XmlParser::getFloatAttribute(node, "bottomRadius", bottomRadius);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, 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 X3DNodeElementGeometry3D(X3DElemType::ENET_Cone, mNodeElementCur);
		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)
            ((X3DNodeElementGeometry3D*)ne)->Vertices.push_back(*it);

		((X3DNodeElementGeometry3D *)ne)->Solid = solid;
        ((X3DNodeElementGeometry3D *)ne)->NumIndices = 3;
		// check for X3DMetadataObject childs.
		if(!isNodeEmpty(node))
			childrenReadMetadata(node, ne, "Cone");
		else
			mNodeElementCur->Children.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::readCylinder(XmlNode &node) {
    std::string use, def;
    bool bottom = true;
    float height = 2;
    float radius = 1;
    bool side = true;
    bool solid = true;
    bool top = true;
    X3DNodeElementBase* ne( nullptr );

    MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    XmlParser::getFloatAttribute(node, "radius", radius);
    XmlParser::getBoolAttribute(node, "solid", solid);
    XmlParser::getBoolAttribute(node, "bottom", bottom);
    XmlParser::getBoolAttribute(node, "top", top);
    XmlParser::getBoolAttribute(node, "side", side);
    XmlParser::getFloatAttribute(node, "height", height);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, 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 X3DNodeElementGeometry3D(X3DElemType::ENET_Cylinder, mNodeElementCur);
		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 = ((X3DNodeElementGeometry3D *)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)

		((X3DNodeElementGeometry3D *)ne)->Solid = solid;
        ((X3DNodeElementGeometry3D *)ne)->NumIndices = 3;
		// check for X3DMetadataObject childs.
		if(!isNodeEmpty(node))
			childrenReadMetadata(node, ne, "Cylinder");
		else
			mNodeElementCur->Children.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::readElevationGrid(XmlNode &node) {
    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;
    X3DNodeElementBase* ne( nullptr );

    MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    XmlParser::getBoolAttribute(node, "solid", solid);
    XmlParser::getBoolAttribute(node, "ccw", ccw);
    XmlParser::getBoolAttribute(node, "colorPerVertex", colorPerVertex);
    XmlParser::getBoolAttribute(node, "normalPerVertex", normalPerVertex);
    XmlParser::getFloatAttribute(node, "creaseAngle", creaseAngle);
    X3DXmlHelper::getFloatArrayAttribute(node, "height", height);
    XmlParser::getIntAttribute(node, "xDimension", xDimension);
    XmlParser::getFloatAttribute(node, "xSpacing", xSpacing);
    XmlParser::getIntAttribute(node, "zDimension", zDimension);
    XmlParser::getFloatAttribute(node, "zSpacing", zSpacing);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, 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()) DeadlyImportError("Heights count must be equal to \"xDimension * zDimension\" in <ElevationGrid>");

		// create and if needed - define new geometry object.
		ne = new X3DNodeElementElevationGrid(X3DElemType::ENET_ElevationGrid, mNodeElementCur);
		if(!def.empty()) ne->ID = def;

		X3DNodeElementElevationGrid &grid_alias = *((X3DNodeElementElevationGrid *)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.
		{
            ((X3DNodeElementElevationGrid *)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.
		{
            ((X3DNodeElementElevationGrid *)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(!isNodeEmpty(node))
        {
			ParseHelper_Node_Enter(ne);
            for (auto currentChildNode : node.children()) {
                const std::string &currentChildName = currentChildNode.name();
            	// check for X3DComposedGeometryNodes
                if (currentChildName == "Color") readColor(currentChildNode);
                else if (currentChildName == "ColorRGBA") readColorRGBA(currentChildNode);
                else if (currentChildName == "Normal") readNormal(currentChildNode);
                else if (currentChildName == "TextureCoordinate") readTextureCoordinate(currentChildNode);
				// check for X3DMetadataObject
                else if (!checkForMetadataNode(currentChildNode)) skipUnsupportedNode("ElevationGrid", currentChildNode);
            }
            ParseHelper_Node_Exit();
		}// if(!mReader->isEmptyElement())
		else
		{
			mNodeElementCur->Children.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::readExtrusion(XmlNode &node) {
    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;
    X3DNodeElementBase* ne( nullptr );

    MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    XmlParser::getBoolAttribute(node, "beginCap", beginCap);
    XmlParser::getBoolAttribute(node, "ccw", ccw);
    XmlParser::getBoolAttribute(node, "convex", convex);
    XmlParser::getFloatAttribute(node, "creaseAngle", creaseAngle);
    X3DXmlHelper::getVector2DArrayAttribute(node, "crossSection", crossSection);
    XmlParser::getBoolAttribute(node, "endCap", endCap);
    X3DXmlHelper::getFloatArrayAttribute(node, "orientation", orientation);
    X3DXmlHelper::getVector2DArrayAttribute(node, "scale", scale);
    XmlParser::getBoolAttribute(node, "solid", solid);
    X3DXmlHelper::getVector3DArrayAttribute(node, "spine", spine);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, 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 X3DNodeElementIndexedSet(X3DElemType::ENET_Extrusion, mNodeElementCur);
		if(!def.empty()) ne->ID = def;

		X3DNodeElementIndexedSet &ext_alias = *((X3DNodeElementIndexedSet *)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.emplace_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(!isNodeEmpty(node))
			childrenReadMetadata(node, ne, "Extrusion");
		else
			mNodeElementCur->Children.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::readIndexedFaceSet(XmlNode &node) {
    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;
    X3DNodeElementBase* ne( nullptr );

    MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    XmlParser::getBoolAttribute(node, "ccw", ccw);
    X3DXmlHelper::getInt32ArrayAttribute(node, "colorIndex", colorIndex);
    XmlParser::getBoolAttribute(node, "colorPerVertex", colorPerVertex);
    XmlParser::getBoolAttribute(node, "convex", convex);
    X3DXmlHelper::getInt32ArrayAttribute(node, "coordIndex", coordIndex);
    XmlParser::getFloatAttribute(node, "creaseAngle", creaseAngle);
    X3DXmlHelper::getInt32ArrayAttribute(node, "normalIndex", normalIndex);
    XmlParser::getBoolAttribute(node, "normalPerVertex", normalPerVertex);
    XmlParser::getBoolAttribute(node, "solid", solid);
    X3DXmlHelper::getInt32ArrayAttribute(node, "texCoordIndex", texCoordIndex);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, 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 X3DNodeElementIndexedSet(X3DElemType::ENET_IndexedFaceSet, mNodeElementCur);
		if(!def.empty()) ne->ID = def;

		X3DNodeElementIndexedSet &ne_alias = *((X3DNodeElementIndexedSet *)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(!isNodeEmpty(node))
        {
			ParseHelper_Node_Enter(ne);
            for (auto currentChildNode : node.children()) {
                const std::string &currentChildName = currentChildNode.name();
                // check for X3DComposedGeometryNodes
                if (currentChildName == "Color") readColor(currentChildNode);
                else if (currentChildName == "ColorRGBA") readColorRGBA(currentChildNode);
                else if (currentChildName == "Coordinate") readCoordinate(currentChildNode);
                else if (currentChildName == "Normal") readNormal(currentChildNode);
                else if (currentChildName == "TextureCoordinate") readTextureCoordinate(currentChildNode);
                // check for X3DMetadataObject
                else if (!checkForMetadataNode(currentChildNode)) skipUnsupportedNode("IndexedFaceSet", currentChildNode);
            }
			ParseHelper_Node_Exit();
		}// if(!isNodeEmpty(node))
		else
		{
			mNodeElementCur->Children.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::readSphere(XmlNode &node) {
    std::string use, def;
    ai_real radius = 1;
    bool solid = true;
    X3DNodeElementBase* ne( nullptr );

    MACRO_ATTRREAD_CHECKUSEDEF_RET(node, def, use);
    XmlParser::getFloatAttribute(node, "radius", radius);
    XmlParser::getBoolAttribute(node, "solid", solid);

	// if "USE" defined then find already defined element.
	if(!use.empty())
	{
		MACRO_USE_CHECKANDAPPLY(node, 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 X3DNodeElementGeometry3D(X3DElemType::ENET_Sphere, mNodeElementCur);
		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)
		{
            ((X3DNodeElementGeometry3D *)ne)->Vertices.push_back(*it * radius);
		}

		((X3DNodeElementGeometry3D *)ne)->Solid = solid;
        ((X3DNodeElementGeometry3D *)ne)->NumIndices = 3;
		// check for X3DMetadataObject childs.
		if(!isNodeEmpty(node))
			childrenReadMetadata(node, ne, "Sphere");
		else
			mNodeElementCur->Children.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
}

}// namespace Assimp

#endif // !ASSIMP_BUILD_NO_X3D_IMPORTER