assimp/code/IFCUtil.cpp

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

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  following disclaimer.

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*/

/** @file  IFCUtil.cpp
 *  @brief Implementation of conversion routines for some common Ifc helper entities.
 */



#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER

#include "IFCUtil.h"
#include "PolyTools.h"
#include "ProcessHelper.h"
#include "Defines.h"

namespace Assimp {
	namespace IFC {

// ------------------------------------------------------------------------------------------------
void TempOpening::Transform(const IfcMatrix4& mat) 
{
	if(profileMesh) {
		profileMesh->Transform(mat);
	}
	if(profileMesh2D) {
		profileMesh2D->Transform(mat);
	}
	extrusionDir *= IfcMatrix3(mat);
}

// ------------------------------------------------------------------------------------------------
aiMesh* TempMesh::ToMesh() 
{
	ai_assert(verts.size() == std::accumulate(vertcnt.begin(),vertcnt.end(),size_t(0)));

	if (verts.empty()) {
		return NULL;
	}

	std::auto_ptr<aiMesh> mesh(new aiMesh());

	// copy vertices
	mesh->mNumVertices = static_cast<unsigned int>(verts.size());
	mesh->mVertices = new aiVector3D[mesh->mNumVertices];
	std::copy(verts.begin(),verts.end(),mesh->mVertices);

	// and build up faces
	mesh->mNumFaces = static_cast<unsigned int>(vertcnt.size());
	mesh->mFaces = new aiFace[mesh->mNumFaces];

	for(unsigned int i = 0,n=0, acc = 0; i < mesh->mNumFaces; ++n) {
		aiFace& f = mesh->mFaces[i];
		if (!vertcnt[n]) {
			--mesh->mNumFaces;
			continue;
		}

		f.mNumIndices = vertcnt[n];
		f.mIndices = new unsigned int[f.mNumIndices];
		for(unsigned int a = 0; a < f.mNumIndices; ++a) {
			f.mIndices[a] = acc++;
		}

		++i;
	}

	return mesh.release();
}

// ------------------------------------------------------------------------------------------------
void TempMesh::Clear()
{
	verts.clear();
	vertcnt.clear();
}

// ------------------------------------------------------------------------------------------------
void TempMesh::Transform(const IfcMatrix4& mat) 
{
	BOOST_FOREACH(IfcVector3& v, verts) {
		v *= mat;
	}
}

// ------------------------------------------------------------------------------
IfcVector3 TempMesh::Center() const
{
	return (verts.size() == 0) ? IfcVector3(0.0f, 0.0f, 0.0f) : (std::accumulate(verts.begin(),verts.end(),IfcVector3()) / static_cast<IfcFloat>(verts.size()));
}

// ------------------------------------------------------------------------------------------------
void TempMesh::Append(const TempMesh& other)
{
	verts.insert(verts.end(),other.verts.begin(),other.verts.end());
	vertcnt.insert(vertcnt.end(),other.vertcnt.begin(),other.vertcnt.end());
}

// ------------------------------------------------------------------------------------------------
void TempMesh::RemoveDegenerates()
{
	// The strategy is simple: walk the mesh and compute normals using
	// Newell's algorithm. The length of the normals gives the area
	// of the polygons, which is close to zero for lines.

	std::vector<IfcVector3> normals;
	ComputePolygonNormals(normals, false);

	bool drop = false;
	size_t inor = 0;

	std::vector<IfcVector3>::iterator vit = verts.begin();
	for (std::vector<unsigned int>::iterator it = vertcnt.begin(); it != vertcnt.end(); ++inor) {
		const unsigned int pcount = *it;
		
		if (normals[inor].SquareLength() < 1e-10f) {
			it = vertcnt.erase(it);
			vit = verts.erase(vit, vit + pcount);

			drop = true;
			continue;
		}

		vit += pcount;
		++it;
	}

	if(drop) {
		IFCImporter::LogDebug("removing degenerate faces");
	}
}

// ------------------------------------------------------------------------------------------------
IfcVector3 TempMesh::ComputePolygonNormal(const IfcVector3* vtcs, size_t cnt, bool normalize)
{
	std::vector<IfcFloat> temp((cnt+2)*3);
	for( size_t vofs = 0, i = 0; vofs < cnt; ++vofs )
	{
		const IfcVector3& v = vtcs[vofs];
		temp[i++] = v.x;
		temp[i++] = v.y;
		temp[i++] = v.z;
	}

	IfcVector3 nor;
	NewellNormal<3, 3, 3>(nor, cnt, &temp[0], &temp[1], &temp[2]);
	return normalize ? nor.Normalize() : nor;
}

// ------------------------------------------------------------------------------------------------
void TempMesh::ComputePolygonNormals(std::vector<IfcVector3>& normals, 
	bool normalize, 
	size_t ofs) const
{
	size_t max_vcount = 0;
	std::vector<unsigned int>::const_iterator begin = vertcnt.begin()+ofs, end = vertcnt.end(),  iit;
	for(iit = begin; iit != end; ++iit) {
		max_vcount = std::max(max_vcount,static_cast<size_t>(*iit));
	}

	std::vector<IfcFloat> temp((max_vcount+2)*4);
	normals.reserve( normals.size() + vertcnt.size()-ofs );

	// `NewellNormal()` currently has a relatively strange interface and need to 
	// re-structure things a bit to meet them.
	size_t vidx = std::accumulate(vertcnt.begin(),begin,0);
	for(iit = begin; iit != end; vidx += *iit++) {
		if (!*iit) {
			normals.push_back(IfcVector3());
			continue;
		}
		for(size_t vofs = 0, cnt = 0; vofs < *iit; ++vofs) {
			const IfcVector3& v = verts[vidx+vofs];
			temp[cnt++] = v.x;
			temp[cnt++] = v.y;
			temp[cnt++] = v.z;
#ifdef ASSIMP_BUILD_DEBUG
			temp[cnt] = std::numeric_limits<IfcFloat>::quiet_NaN();
#endif
			++cnt;
		}

		normals.push_back(IfcVector3());
		NewellNormal<4,4,4>(normals.back(),*iit,&temp[0],&temp[1],&temp[2]);
	}

	if(normalize) {
		BOOST_FOREACH(IfcVector3& n, normals) {
			n.Normalize();
		}
	}
}

// ------------------------------------------------------------------------------------------------
// Compute the normal of the last polygon in the given mesh
IfcVector3 TempMesh::ComputeLastPolygonNormal(bool normalize) const
{
	return ComputePolygonNormal(&verts[verts.size() - vertcnt.back()], vertcnt.back(), normalize);
}

struct CompareVector
{
	bool operator () (const IfcVector3& a, const IfcVector3& b) const
	{
		IfcVector3 d = a - b;
		IfcFloat eps = 1e-6;
		return d.x < -eps || (std::abs(d.x) < eps && d.y < -eps) || (std::abs(d.x) < eps && std::abs(d.y) < eps && d.z < -eps);
	}
};
struct FindVector
{
	IfcVector3 v;
	FindVector(const IfcVector3& p) : v(p) { }
	bool operator () (const IfcVector3& p) { return FuzzyVectorCompare(1e-6)(p, v); }
};

// ------------------------------------------------------------------------------------------------
void TempMesh::FixupFaceOrientation()
{
	const IfcVector3 vavg = Center();

	// create a list of start indices for all faces to allow random access to faces
	std::vector<size_t> faceStartIndices(vertcnt.size());
	for( size_t i = 0, a = 0; a < vertcnt.size(); i += vertcnt[a], ++a )
		faceStartIndices[a] = i;

	// list all faces on a vertex
	std::map<IfcVector3, std::vector<size_t>, CompareVector> facesByVertex;
	for( size_t a = 0; a < vertcnt.size(); ++a )
	{
		for( size_t b = 0; b < vertcnt[a]; ++b )
			facesByVertex[verts[faceStartIndices[a] + b]].push_back(a);
	}
	// determine neighbourhood for all polys
	std::vector<size_t> neighbour(verts.size(), SIZE_MAX);
	std::vector<size_t> tempIntersect(10);
	for( size_t a = 0; a < vertcnt.size(); ++a )
	{
		for( size_t b = 0; b < vertcnt[a]; ++b )
		{
			size_t ib = faceStartIndices[a] + b, nib = faceStartIndices[a] + (b + 1) % vertcnt[a];
			const std::vector<size_t>& facesOnB = facesByVertex[verts[ib]];
			const std::vector<size_t>& facesOnNB = facesByVertex[verts[nib]];
			// there should be exactly one or two faces which appear in both lists. Our face and the other side
			std::vector<size_t>::iterator sectstart = tempIntersect.begin();
			std::vector<size_t>::iterator sectend = std::set_intersection(
				facesOnB.begin(), facesOnB.end(), facesOnNB.begin(), facesOnNB.end(), sectstart);

			if( std::distance(sectstart, sectend) != 2 )
				continue;
			if( *sectstart == a )
				++sectstart;
			neighbour[ib] = *sectstart;
		}
	}

	// now we're getting started. We take the face which is the farthest away from the center. This face is most probably
	// facing outwards. So we reverse this face to point outwards in relation to the center. Then we adapt neighbouring 
	// faces to have the same winding until all faces have been tested.
	std::vector<bool> faceDone(vertcnt.size(), false);
	while( std::count(faceDone.begin(), faceDone.end(), false) != 0 )
	{
		// find the farthest of the remaining faces
		size_t farthestIndex = SIZE_MAX;
		IfcFloat farthestDistance = -1.0;
		for( size_t a = 0; a < vertcnt.size(); ++a )
		{
			if( faceDone[a] )
				continue;
			IfcVector3 faceCenter = std::accumulate(verts.begin() + faceStartIndices[a],
				verts.begin() + faceStartIndices[a] + vertcnt[a], IfcVector3(0.0)) / IfcFloat(vertcnt[a]);
			IfcFloat dst = (faceCenter - vavg).SquareLength();
			if( dst > farthestDistance ) { farthestDistance = dst; farthestIndex = a; }
		}

		// calculate its normal and reverse the poly if its facing towards the mesh center
		IfcVector3 farthestNormal = ComputePolygonNormal(verts.data() + faceStartIndices[farthestIndex], vertcnt[farthestIndex]);
		IfcVector3 farthestCenter = std::accumulate(verts.begin() + faceStartIndices[farthestIndex],
			verts.begin() + faceStartIndices[farthestIndex] + vertcnt[farthestIndex], IfcVector3(0.0))
			/ IfcFloat(vertcnt[farthestIndex]);
		// We accapt a bit of negative orientation without reversing. In case of doubt, prefer the orientation given in 
		// the file.
		if( (farthestNormal * (farthestCenter - vavg).Normalize()) < -0.4 )
		{
			size_t fsi = faceStartIndices[farthestIndex], fvc = vertcnt[farthestIndex];
			std::reverse(verts.begin() + fsi, verts.begin() + fsi + fvc);
			std::reverse(neighbour.begin() + fsi, neighbour.begin() + fsi + fvc);
			// because of the neighbour index belonging to the edge starting with the point at the same index, we need to 
			// cycle the neighbours through to match the edges again.
			// Before: points A - B - C - D with edge neighbour p - q - r - s
			// After: points D - C - B - A, reversed neighbours are s - r - q - p, but the should be
			//                r   q   p   s
			for( size_t a = 0; a < fvc - 1; ++a )
				std::swap(neighbour[fsi + a], neighbour[fsi + a + 1]);
		}
		faceDone[farthestIndex] = true;
		std::vector<size_t> todo;
		todo.push_back(farthestIndex);

		// go over its neighbour faces recursively and adapt their winding order to match the farthest face 
		while( !todo.empty() )
		{
			size_t tdf = todo.back();
			size_t vsi = faceStartIndices[tdf], vc = vertcnt[tdf];
			todo.pop_back();

			// check its neighbours
			for( size_t a = 0; a < vc; ++a )
			{
				// ignore neighbours if we already checked them
				size_t nbi = neighbour[vsi + a];
				if( nbi == SIZE_MAX || faceDone[nbi] )
					continue;

				const IfcVector3& vp = verts[vsi + a];
				size_t nbvsi = faceStartIndices[nbi], nbvc = vertcnt[nbi];
				std::vector<IfcVector3>::iterator it = std::find_if(verts.begin() + nbvsi, verts.begin() + nbvsi + nbvc, FindVector(vp));
				ai_assert(it != verts.begin() + nbvsi + nbvc);
				size_t nb_vidx = std::distance(verts.begin() + nbvsi, it);
				// two faces winded in the same direction should have a crossed edge, where one face has p0->p1 and the other
				// has p1'->p0'. If the next point on the neighbouring face is also the next on the current face, we need 
				// to reverse the neighbour
				nb_vidx = (nb_vidx + 1) % nbvc;
				size_t oursideidx = (a + 1) % vc;
				if( FuzzyVectorCompare(1e-6)(verts[vsi + oursideidx], verts[nbvsi + nb_vidx]) )
				{
					std::reverse(verts.begin() + nbvsi, verts.begin() + nbvsi + nbvc);
					std::reverse(neighbour.begin() + nbvsi, neighbour.begin() + nbvsi + nbvc);
					for( size_t a = 0; a < nbvc - 1; ++a )
						std::swap(neighbour[nbvsi + a], neighbour[nbvsi + a + 1]);
				}

				// either way we're done with the neighbour. Mark it as done and continue checking from there recursively
				faceDone[nbi] = true;
				todo.push_back(nbi);
			}
		}

		// no more faces reachable from this part of the surface, start over with a disjunct part and its farthest face
	}
}

// ------------------------------------------------------------------------------------------------
void TempMesh::RemoveAdjacentDuplicates() 
{

	bool drop = false;
	std::vector<IfcVector3>::iterator base = verts.begin();
	BOOST_FOREACH(unsigned int& cnt, vertcnt) {
		if (cnt < 2){
			base += cnt;
			continue;
		}

		IfcVector3 vmin,vmax;
		ArrayBounds(&*base, cnt ,vmin,vmax);


		const IfcFloat epsilon = (vmax-vmin).SquareLength() / static_cast<IfcFloat>(1e9);
		//const IfcFloat dotepsilon = 1e-9;

		//// look for vertices that lie directly on the line between their predecessor and their 
		//// successor and replace them with either of them.

		//for(size_t i = 0; i < cnt; ++i) {
		//	IfcVector3& v1 = *(base+i), &v0 = *(base+(i?i-1:cnt-1)), &v2 = *(base+(i+1)%cnt);
		//	const IfcVector3& d0 = (v1-v0), &d1 = (v2-v1);
		//	const IfcFloat l0 = d0.SquareLength(), l1 = d1.SquareLength();
		//	if (!l0 || !l1) {
		//		continue;
		//	}

		//	const IfcFloat d = (d0/std::sqrt(l0))*(d1/std::sqrt(l1));

		//	if ( d >= 1.f-dotepsilon ) {
		//		v1 = v0;
		//	}
		//	else if ( d < -1.f+dotepsilon ) {
		//		v2 = v1;
		//		continue;
		//	}
		//}

		// drop any identical, adjacent vertices. this pass will collect the dropouts
		// of the previous pass as a side-effect.
		FuzzyVectorCompare fz(epsilon);
		std::vector<IfcVector3>::iterator end = base+cnt, e = std::unique( base, end, fz );
		if (e != end) {
			cnt -= static_cast<unsigned int>(std::distance(e, end));
			verts.erase(e,end);
			drop  = true;
		}

		// check front and back vertices for this polygon
		if (cnt > 1 && fz(*base,*(base+cnt-1))) {
			verts.erase(base+ --cnt);
			drop  = true;
		}

		// removing adjacent duplicates shouldn't erase everything :-)
		ai_assert(cnt>0);
		base += cnt;
	}
	if(drop) {
		IFCImporter::LogDebug("removing duplicate vertices");
	}
}

// ------------------------------------------------------------------------------------------------
void TempMesh::Swap(TempMesh& other)
{
	vertcnt.swap(other.vertcnt);
	verts.swap(other.verts);
}

// ------------------------------------------------------------------------------------------------
bool IsTrue(const EXPRESS::BOOLEAN& in)
{
	return (std::string)in == "TRUE" || (std::string)in == "T";
}

// ------------------------------------------------------------------------------------------------
IfcFloat ConvertSIPrefix(const std::string& prefix)
{
	if (prefix == "EXA") {
		return 1e18f;
	}
	else if (prefix == "PETA") {
		return 1e15f;
	}
	else if (prefix == "TERA") {
		return 1e12f;
	}
	else if (prefix == "GIGA") {
		return 1e9f;
	}
	else if (prefix == "MEGA") {
		return 1e6f;
	}
	else if (prefix == "KILO") {
		return 1e3f;
	}
	else if (prefix == "HECTO") {
		return 1e2f;
	}
	else if (prefix == "DECA") {
		return 1e-0f;
	}
	else if (prefix == "DECI") {
		return 1e-1f;
	}
	else if (prefix == "CENTI") {
		return 1e-2f;
	}
	else if (prefix == "MILLI") {
		return 1e-3f;
	}
	else if (prefix == "MICRO") {
		return 1e-6f;
	}
	else if (prefix == "NANO") {
		return 1e-9f;
	}
	else if (prefix == "PICO") {
		return 1e-12f;
	}
	else if (prefix == "FEMTO") {
		return 1e-15f;
	}
	else if (prefix == "ATTO") {
		return 1e-18f;
	}
	else {
		IFCImporter::LogError("Unrecognized SI prefix: " + prefix);
		return 1;
	}
}

// ------------------------------------------------------------------------------------------------
void ConvertColor(aiColor4D& out, const IfcColourRgb& in)
{
	out.r = static_cast<float>( in.Red );
	out.g = static_cast<float>( in.Green );
	out.b = static_cast<float>( in.Blue );
	out.a = static_cast<float>( 1.f );
}

// ------------------------------------------------------------------------------------------------
void ConvertColor(aiColor4D& out, const IfcColourOrFactor& in,ConversionData& conv,const aiColor4D* base)
{
	if (const EXPRESS::REAL* const r = in.ToPtr<EXPRESS::REAL>()) {
		out.r = out.g = out.b = static_cast<float>(*r);
		if(base) {
			out.r *= static_cast<float>( base->r );
			out.g *= static_cast<float>( base->g );
			out.b *= static_cast<float>( base->b );
			out.a = static_cast<float>( base->a );
		}
		else out.a = 1.0;
	}
	else if (const IfcColourRgb* const rgb = in.ResolveSelectPtr<IfcColourRgb>(conv.db)) {
		ConvertColor(out,*rgb);
	}
	else {
		IFCImporter::LogWarn("skipping unknown IfcColourOrFactor entity");
	}
}

// ------------------------------------------------------------------------------------------------
void ConvertCartesianPoint(IfcVector3& out, const IfcCartesianPoint& in)
{
	out = IfcVector3();
	for(size_t i = 0; i < in.Coordinates.size(); ++i) {
		out[i] = in.Coordinates[i];
	}
}

// ------------------------------------------------------------------------------------------------
void ConvertVector(IfcVector3& out, const IfcVector& in)
{
	ConvertDirection(out,in.Orientation);
	out *= in.Magnitude;
}

// ------------------------------------------------------------------------------------------------
void ConvertDirection(IfcVector3& out, const IfcDirection& in)
{
	out = IfcVector3();
	for(size_t i = 0; i < in.DirectionRatios.size(); ++i) {
		out[i] = in.DirectionRatios[i];
	}
	const IfcFloat len = out.Length();
	if (len<1e-6) {
		IFCImporter::LogWarn("direction vector magnitude too small, normalization would result in a division by zero");
		return;
	}
	out /= len;
}

// ------------------------------------------------------------------------------------------------
void AssignMatrixAxes(IfcMatrix4& out, const IfcVector3& x, const IfcVector3& y, const IfcVector3& z)
{
	out.a1 = x.x;
	out.b1 = x.y;
	out.c1 = x.z;

	out.a2 = y.x;
	out.b2 = y.y;
	out.c2 = y.z;

	out.a3 = z.x;
	out.b3 = z.y;
	out.c3 = z.z;
}

// ------------------------------------------------------------------------------------------------
void ConvertAxisPlacement(IfcMatrix4& out, const IfcAxis2Placement3D& in)
{
	IfcVector3 loc;
	ConvertCartesianPoint(loc,in.Location);

	IfcVector3 z(0.f,0.f,1.f),r(1.f,0.f,0.f),x;

	if (in.Axis) { 
		ConvertDirection(z,*in.Axis.Get());
	}
	if (in.RefDirection) {
		ConvertDirection(r,*in.RefDirection.Get());
	}

	IfcVector3 v = r.Normalize();
	IfcVector3 tmpx = z * (v*z);

	x = (v-tmpx).Normalize();
	IfcVector3 y = (z^x);

	IfcMatrix4::Translation(loc,out);
	AssignMatrixAxes(out,x,y,z);
}

// ------------------------------------------------------------------------------------------------
void ConvertAxisPlacement(IfcMatrix4& out, const IfcAxis2Placement2D& in)
{
	IfcVector3 loc;
	ConvertCartesianPoint(loc,in.Location);

	IfcVector3 x(1.f,0.f,0.f);
	if (in.RefDirection) {
		ConvertDirection(x,*in.RefDirection.Get());
	}

	const IfcVector3 y = IfcVector3(x.y,-x.x,0.f);

	IfcMatrix4::Translation(loc,out);
	AssignMatrixAxes(out,x,y,IfcVector3(0.f,0.f,1.f));
}

// ------------------------------------------------------------------------------------------------
void ConvertAxisPlacement(IfcVector3& axis, IfcVector3& pos, const IfcAxis1Placement& in)
{
	ConvertCartesianPoint(pos,in.Location);
	if (in.Axis) {
		ConvertDirection(axis,in.Axis.Get());
	}
	else {
		axis = IfcVector3(0.f,0.f,1.f);
	}
}

// ------------------------------------------------------------------------------------------------
void ConvertAxisPlacement(IfcMatrix4& out, const IfcAxis2Placement& in, ConversionData& conv)
{
	if(const IfcAxis2Placement3D* pl3 = in.ResolveSelectPtr<IfcAxis2Placement3D>(conv.db)) {
		ConvertAxisPlacement(out,*pl3);
	}
	else if(const IfcAxis2Placement2D* pl2 = in.ResolveSelectPtr<IfcAxis2Placement2D>(conv.db)) {
		ConvertAxisPlacement(out,*pl2);
	}
	else {
		IFCImporter::LogWarn("skipping unknown IfcAxis2Placement entity");
	}
}

// ------------------------------------------------------------------------------------------------
void ConvertTransformOperator(IfcMatrix4& out, const IfcCartesianTransformationOperator& op)
{
	IfcVector3 loc;
	ConvertCartesianPoint(loc,op.LocalOrigin);

	IfcVector3 x(1.f,0.f,0.f),y(0.f,1.f,0.f),z(0.f,0.f,1.f);
	if (op.Axis1) {
		ConvertDirection(x,*op.Axis1.Get());
	}
	if (op.Axis2) {
		ConvertDirection(y,*op.Axis2.Get());
	}
	if (const IfcCartesianTransformationOperator3D* op2 = op.ToPtr<IfcCartesianTransformationOperator3D>()) {
		if(op2->Axis3) {
			ConvertDirection(z,*op2->Axis3.Get());
		}
	}

	IfcMatrix4 locm;
	IfcMatrix4::Translation(loc,locm);	
	AssignMatrixAxes(out,x,y,z);


	IfcVector3 vscale;
	if (const IfcCartesianTransformationOperator3DnonUniform* nuni = op.ToPtr<IfcCartesianTransformationOperator3DnonUniform>()) {
		vscale.x = nuni->Scale?op.Scale.Get():1.f;
		vscale.y = nuni->Scale2?nuni->Scale2.Get():1.f;
		vscale.z = nuni->Scale3?nuni->Scale3.Get():1.f;
	}
	else {
		const IfcFloat sc = op.Scale?op.Scale.Get():1.f;
		vscale = IfcVector3(sc,sc,sc);
	}

	IfcMatrix4 s;
	IfcMatrix4::Scaling(vscale,s);

	out = locm * out * s;
}


} // ! IFC
} // ! Assimp

#endif