Merge branch 'master' of https://github.com/assimp/assimp

2013-02-12 13:22:17 +01:00 · 2013-02-12 13:22:17 +01:00 · 196d1b54cb
parent 18f01268e6 c9cfbc2ae9
commit 196d1b54cb
14 changed files with 2666 additions and 1987 deletions
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@ -381,6 +381,8 @@ SET(IFC_SRCS
 	IFCMaterial.cpp
 	IFCProfile.cpp
 	IFCCurve.cpp
+	IFCBoolean.cpp
+	IFCOpenings.cpp
 	STEPFile.h
 	STEPFileReader.h
 	STEPFileReader.cpp
--- a/code/IFCGeometry.cpp
+++ b/code/IFCGeometry.cpp
--- a/code/IFCLoader.cpp
+++ b/code/IFCLoader.cpp
@ -599,7 +599,7 @@ aiNode* ProcessSpatialStructure(aiNode* parent, const IfcProduct& el, Conversion

 	// add an output node for this spatial structure
 	std::auto_ptr<aiNode> nd(new aiNode());
-	nd->mName.Set(el.GetClassName()+"_"+(el.Name?el.Name:el.GlobalId));
+	nd->mName.Set(el.GetClassName()+"_"+(el.Name?el.Name.Get():"Unnamed")+"_"+el.GlobalId);
 	nd->mParent = parent;

 	if(el.ObjectPlacement) {
--- a/code/IFCOpenings.cpp
+++ b/code/IFCOpenings.cpp
--- a/code/IFCUtil.cpp
+++ b/code/IFCUtil.cpp
@ -59,6 +59,9 @@ void TempOpening::Transform(const IfcMatrix4& mat)
 	if(profileMesh) {
 		profileMesh->Transform(mat);
 	}
+	if(profileMesh2D) {
+		profileMesh2D->Transform(mat);
+	}
 	extrusionDir *= IfcMatrix3(mat);
 }

@ -311,6 +314,13 @@ void TempMesh::RemoveAdjacentDuplicates()
 	}
 }

+// ------------------------------------------------------------------------------------------------
+void TempMesh::Swap(TempMesh& other)
+{
+	vertcnt.swap(other.vertcnt);
+	verts.swap(other.verts);
+}
+
 // ------------------------------------------------------------------------------------------------
 bool IsTrue(const EXPRESS::BOOLEAN& in)
 {
@ -560,6 +570,7 @@ void ConvertTransformOperator(IfcMatrix4& out, const IfcCartesianTransformationO
 	out = locm * out * s;
 }

+
 } // ! IFC
 } // ! Assimp

--- a/code/IFCUtil.h
+++ b/code/IFCUtil.h
@ -61,7 +61,9 @@ namespace IFC {
 	typedef aiColor4t<IfcFloat> IfcColor4; 


-// helper for std::for_each to delete all heap-allocated items in a container
+// ------------------------------------------------------------------------------------------------
+// Helper for std::for_each to delete all heap-allocated items in a container
+// ------------------------------------------------------------------------------------------------
 template<typename T>
 struct delete_fun
 {
@ -70,15 +72,50 @@ struct delete_fun
 	}
 };

+
+
+// ------------------------------------------------------------------------------------------------
+// Helper used during mesh construction. Aids at creating aiMesh'es out of relatively few polygons.
+// ------------------------------------------------------------------------------------------------
+struct TempMesh
+{
+	std::vector<IfcVector3> verts;
+	std::vector<unsigned int> vertcnt;
+
+	// utilities
+	aiMesh* ToMesh();
+	void Clear();
+	void Transform(const IfcMatrix4& mat);
+	IfcVector3 Center() const;
+	void Append(const TempMesh& other);
+
+	bool IsEmpty() const {
+		return verts.empty() && vertcnt.empty();
+	}
+
+	void RemoveAdjacentDuplicates();
+	void RemoveDegenerates();
+
+	void FixupFaceOrientation();
+	IfcVector3 ComputeLastPolygonNormal(bool normalize = true) const;
+	void ComputePolygonNormals(std::vector<IfcVector3>& normals, 
+		bool normalize = true, 
+		size_t ofs = 0) const;
+
+	void Swap(TempMesh& other);
+};
+
+
 // ------------------------------------------------------------------------------------------------
 // Temporary representation of an opening in a wall or a floor
 // ------------------------------------------------------------------------------------------------
-struct TempMesh;
 struct TempOpening 
 {
 	const IFC::IfcSolidModel* solid;
 	IfcVector3 extrusionDir;
+	
 	boost::shared_ptr<TempMesh> profileMesh;
+	boost::shared_ptr<TempMesh> profileMesh2D;

 	// list of points generated for this opening. This is used to
 	// create connections between two opposing holes created
@ -96,15 +133,33 @@ struct TempOpening
 	}

 	// ------------------------------------------------------------------------------
-	TempOpening(const IFC::IfcSolidModel* solid,IfcVector3 extrusionDir,boost::shared_ptr<TempMesh> profileMesh)
+	TempOpening(const IFC::IfcSolidModel* solid,IfcVector3 extrusionDir,
+		boost::shared_ptr<TempMesh> profileMesh, 
+		boost::shared_ptr<TempMesh> profileMesh2D)
 		: solid(solid)
 		, extrusionDir(extrusionDir)
 		, profileMesh(profileMesh)
+		, profileMesh2D(profileMesh2D)
 	{
 	}

 	// ------------------------------------------------------------------------------
 	void Transform(const IfcMatrix4& mat); // defined later since TempMesh is not complete yet
+
+
+
+	// ------------------------------------------------------------------------------
+	// Helper to sort openings by distance from a given base point
+	struct DistanceSorter {
+
+		DistanceSorter(const IfcVector3& base) : base(base) {}
+
+		bool operator () (const TempOpening& a, const TempOpening& b) const {
+			return (a.profileMesh->Center()-base).SquareLength() < (b.profileMesh->Center()-base).SquareLength();
+		}
+
+		IfcVector3 base;
+	};
 };


@ -155,6 +210,7 @@ struct ConversionData
 	std::vector<TempOpening>* collect_openings;
 };

+
 // ------------------------------------------------------------------------------------------------
 // Binary predicate to compare vectors with a given, quadratic epsilon.
 // ------------------------------------------------------------------------------------------------
@ -170,38 +226,21 @@ struct FuzzyVectorCompare {


 // ------------------------------------------------------------------------------------------------
-// Helper used during mesh construction. Aids at creating aiMesh'es out of relatively few polygons.
+// Ordering predicate to totally order R^2 vectors first by x and then by y
 // ------------------------------------------------------------------------------------------------
-struct TempMesh
-{
-	std::vector<IfcVector3> verts;
-	std::vector<unsigned int> vertcnt;
+struct XYSorter {

-	// utilities
-	aiMesh* ToMesh();
-	void Clear();
-	void Transform(const IfcMatrix4& mat);
-	IfcVector3 Center() const;
-	void Append(const TempMesh& other);
-
-	bool IsEmpty() const {
-		return verts.empty() && vertcnt.empty();
+	// sort first by X coordinates, then by Y coordinates
+	bool operator () (const IfcVector2&a, const IfcVector2& b) const {
+		if (a.x == b.x) {
+			return a.y < b.y;
+		}
+		return a.x < b.x;
 	}
-
-	void RemoveAdjacentDuplicates();
-	void RemoveDegenerates();
-
-	void FixupFaceOrientation();
-	IfcVector3 ComputeLastPolygonNormal(bool normalize = true) const;
-	void ComputePolygonNormals(std::vector<IfcVector3>& normals, 
-		bool normalize = true, 
-		size_t ofs = 0) const;
 };



-
-
 // conversion routines for common IFC entities, implemented in IFCUtil.cpp
 void ConvertColor(aiColor4D& out, const IfcColourRgb& in);
 void ConvertColor(aiColor4D& out, const IfcColourOrFactor& in,ConversionData& conv,const aiColor4D* base);
@ -225,9 +264,41 @@ bool ProcessProfile(const IfcProfileDef& prof, TempMesh& meshout, ConversionData
 unsigned int ProcessMaterials(const IFC::IfcRepresentationItem& item, ConversionData& conv);

 // IFCGeometry.cpp
+IfcMatrix3 DerivePlaneCoordinateSpace(const TempMesh& curmesh, bool& ok, IfcVector3& norOut);
 bool ProcessRepresentationItem(const IfcRepresentationItem& item, std::vector<unsigned int>& mesh_indices, ConversionData& conv);
 void AssignAddedMeshes(std::vector<unsigned int>& mesh_indices,aiNode* nd,ConversionData& /*conv*/);

+void ProcessSweptAreaSolid(const IfcSweptAreaSolid& swept, TempMesh& meshout, 
+						   ConversionData& conv);
+
+void ProcessExtrudedAreaSolid(const IfcExtrudedAreaSolid& solid, TempMesh& result, 
+							  ConversionData& conv, bool collect_openings);
+
+// IFCBoolean.cpp
+
+void ProcessBoolean(const IfcBooleanResult& boolean, TempMesh& result, ConversionData& conv);
+void ProcessBooleanHalfSpaceDifference(const IfcHalfSpaceSolid* hs, TempMesh& result, 
+									   const TempMesh& first_operand, 
+									   ConversionData& conv);
+
+void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const IfcPolygonalBoundedHalfSpace* hs, TempMesh& result, 
+													   const TempMesh& first_operand, 
+													   ConversionData& conv);
+void ProcessBooleanExtrudedAreaSolidDifference(const IfcExtrudedAreaSolid* as, TempMesh& result, 
+											   const TempMesh& first_operand, 
+											   ConversionData& conv);
+
+
+// IFCOpenings.cpp
+
+bool GenerateOpenings(std::vector<TempOpening>& openings,
+					  const std::vector<IfcVector3>& nors, 
+					  TempMesh& curmesh,
+					  bool check_intersection,
+					  bool generate_connection_geometry,
+					  const IfcVector3& wall_extrusion_axis = IfcVector3(0,1,0));
+
+

 // IFCCurve.cpp

@ -331,8 +402,8 @@ public:
 	using Curve::SampleDiscrete;
 };

-
-
+// IfcProfile.cpp
+bool ProcessCurve(const IfcCurve& curve,  TempMesh& meshout, ConversionData& conv);
 }
 }

--- a/code/IfcBoolean.cpp
+++ b/code/IfcBoolean.cpp
@ -0,0 +1,681 @@
+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, assimp team
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms, 
+with or without modification, are permitted provided that the 
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  IFCBoolean.cpp
+ *  @brief Implements a subset of Ifc boolean operations
+ */
+
+#include "AssimpPCH.h"
+
+#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
+#include "IFCUtil.h"
+#include "PolyTools.h"
+#include "ProcessHelper.h"
+
+#include <iterator>
+
+namespace Assimp {
+	namespace IFC {
+		
+// ------------------------------------------------------------------------------------------------
+enum Intersect {
+	Intersect_No,
+	Intersect_LiesOnPlane,
+	Intersect_Yes
+};
+
+// ------------------------------------------------------------------------------------------------
+Intersect IntersectSegmentPlane(const IfcVector3& p,const IfcVector3& n, const IfcVector3& e0, 
+								const IfcVector3& e1, 
+								IfcVector3& out) 
+{
+	const IfcVector3 pdelta = e0 - p, seg = e1-e0;
+	const IfcFloat dotOne = n*seg, dotTwo = -(n*pdelta);
+
+	if (fabs(dotOne) < 1e-6) {
+		return fabs(dotTwo) < 1e-6f ? Intersect_LiesOnPlane : Intersect_No;
+	}
+
+	const IfcFloat t = dotTwo/dotOne;
+	// t must be in [0..1] if the intersection point is within the given segment
+	if (t > 1.f || t < 0.f) {
+		return Intersect_No;
+	}
+	out = e0+t*seg;
+	return Intersect_Yes;
+}
+
+// ------------------------------------------------------------------------------------------------
+void ProcessBooleanHalfSpaceDifference(const IfcHalfSpaceSolid* hs, TempMesh& result, 
+									   const TempMesh& first_operand, 
+									   ConversionData& conv)
+{
+	ai_assert(hs != NULL);
+
+	const IfcPlane* const plane = hs->BaseSurface->ToPtr<IfcPlane>();
+	if(!plane) {
+		IFCImporter::LogError("expected IfcPlane as base surface for the IfcHalfSpaceSolid");
+		return;
+	}
+
+	// extract plane base position vector and normal vector
+	IfcVector3 p,n(0.f,0.f,1.f);
+	if (plane->Position->Axis) {
+		ConvertDirection(n,plane->Position->Axis.Get());
+	}
+	ConvertCartesianPoint(p,plane->Position->Location);
+
+	if(!IsTrue(hs->AgreementFlag)) {
+		n *= -1.f;
+	}
+
+	// clip the current contents of `meshout` against the plane we obtained from the second operand
+	const std::vector<IfcVector3>& in = first_operand.verts;
+	std::vector<IfcVector3>& outvert = result.verts;
+
+	std::vector<unsigned int>::const_iterator begin = first_operand.vertcnt.begin(), 
+		end = first_operand.vertcnt.end(), iit;
+
+	outvert.reserve(in.size());
+	result.vertcnt.reserve(first_operand.vertcnt.size());
+
+	unsigned int vidx = 0;
+	for(iit = begin; iit != end; vidx += *iit++) {
+
+		unsigned int newcount = 0;
+		for(unsigned int i = 0; i < *iit; ++i) {
+			const IfcVector3& e0 = in[vidx+i], e1 = in[vidx+(i+1)%*iit];
+
+			// does the next segment intersect the plane?
+			IfcVector3 isectpos;
+			const Intersect isect = IntersectSegmentPlane(p,n,e0,e1,isectpos);
+			if (isect == Intersect_No || isect == Intersect_LiesOnPlane) {
+				if ( (e0-p).Normalize()*n > 0 ) {
+					outvert.push_back(e0);
+					++newcount;
+				}
+			}
+			else if (isect == Intersect_Yes) {
+				if ( (e0-p).Normalize()*n > 0 ) {
+					// e0 is on the right side, so keep it 
+					outvert.push_back(e0);
+					outvert.push_back(isectpos);
+					newcount += 2;
+				}
+				else {
+					// e0 is on the wrong side, so drop it and keep e1 instead
+					outvert.push_back(isectpos);
+					++newcount;
+				}
+			}
+		}	
+
+		if (!newcount) {
+			continue;
+		}
+
+		IfcVector3 vmin,vmax;
+		ArrayBounds(&*(outvert.end()-newcount),newcount,vmin,vmax);
+
+		// filter our IfcFloat points - those may happen if a point lies
+		// directly on the intersection line. However, due to IfcFloat
+		// precision a bitwise comparison is not feasible to detect
+		// this case.
+		const IfcFloat epsilon = (vmax-vmin).SquareLength() / 1e6f;
+		FuzzyVectorCompare fz(epsilon);
+
+		std::vector<IfcVector3>::iterator e = std::unique( outvert.end()-newcount, outvert.end(), fz );
+
+		if (e != outvert.end()) {
+			newcount -= static_cast<unsigned int>(std::distance(e,outvert.end()));
+			outvert.erase(e,outvert.end());
+		}
+		if (fz(*( outvert.end()-newcount),outvert.back())) {
+			outvert.pop_back();
+			--newcount;
+		}
+		if(newcount > 2) {
+			result.vertcnt.push_back(newcount);
+		}
+		else while(newcount-->0) {
+			result.verts.pop_back();
+		}
+
+	}
+	IFCImporter::LogDebug("generating CSG geometry by plane clipping (IfcBooleanClippingResult)");
+}
+
+// ------------------------------------------------------------------------------------------------
+// Check if e0-e1 intersects a sub-segment of the given boundary line.
+// note: this functions works on 3D vectors, but performs its intersection checks solely in xy.
+bool IntersectsBoundaryProfile( const IfcVector3& e0, const IfcVector3& e1, const std::vector<IfcVector3>& boundary,
+	std::vector<size_t>& intersected_boundary_segments,
+	std::vector<IfcVector3>& intersected_boundary_points,
+	bool half_open = false,
+	bool* e0_hits_border = NULL)
+{
+	ai_assert(intersected_boundary_segments.empty());
+	ai_assert(intersected_boundary_points.empty());
+
+	if(e0_hits_border) {
+		*e0_hits_border = false;
+	}
+
+	const IfcVector3& e = e1 - e0;
+
+	for (size_t i = 0, bcount = boundary.size(); i < bcount; ++i) {
+		// boundary segment i: b0-b1
+		const IfcVector3& b0 = boundary[i];
+		const IfcVector3& b1 = boundary[(i+1) % bcount];
+
+		const IfcVector3& b = b1 - b0;
+
+		// segment-segment intersection
+		// solve b0 + b*s = e0 + e*t for (s,t)
+		const IfcFloat det = (-b.x * e.y + e.x * b.y);
+		if(fabs(det) < 1e-6) {
+			// no solutions (parallel lines)
+			continue;
+		}
+
+		const IfcFloat x = b0.x - e0.x;
+		const IfcFloat y = b0.y - e0.y;
+
+		const IfcFloat s = (x*e.y - e.x*y)/det;
+		const IfcFloat t = (x*b.y - b.x*y)/det;
+
+#ifdef _DEBUG
+		const IfcVector3 check = b0 + b*s  - (e0 + e*t);
+		ai_assert((IfcVector2(check.x,check.y)).SquareLength() < 1e-5);
+#endif
+
+		// for a valid intersection, s-t should be in range [0,1].
+		// note that for t (i.e. the segment point) we only use a
+		// half-sided epsilon because the next segment should catch
+		// this case.
+		const IfcFloat epsilon = 1e-6;
+		if (t >= -epsilon && (t <= 1.0+epsilon || half_open) && s >= -epsilon && s <= 1.0) {
+
+			if (e0_hits_border && !*e0_hits_border) {
+				*e0_hits_border = fabs(t) < 1e-5f;
+			}
+	
+			const IfcVector3& p = e0 + e*t;
+
+			// only insert the point into the list if it is sufficiently
+			// far away from the previous intersection point. This way,
+			// we avoid duplicate detection if the intersection is
+			// directly on the vertex between two segments.
+			if (!intersected_boundary_points.empty() && intersected_boundary_segments.back()==i-1 ) {
+				const IfcVector3 diff = intersected_boundary_points.back() - p;
+				if(IfcVector3((diff.x, diff.y)).SquareLength() < 1e-7) {
+					continue;
+				}
+			}
+			intersected_boundary_segments.push_back(i);
+			intersected_boundary_points.push_back(p);
+		}
+	}
+
+	return !intersected_boundary_segments.empty();
+}
+
+
+// ------------------------------------------------------------------------------------------------
+// note: this functions works on 3D vectors, but performs its intersection checks solely in xy.
+bool PointInPoly(const IfcVector3& p, const std::vector<IfcVector3>& boundary)
+{
+	// even-odd algorithm: take a random vector that extends from p to infinite
+	// and counts how many times it intersects edges of the boundary.
+	// because checking for segment intersections is prone to numeric inaccuracies
+	// or double detections (i.e. when hitting multiple adjacent segments at their
+	// shared vertices) we do it thrice with different rays and vote on it.
+
+	// the even-odd algorithm doesn't work for points which lie directly on
+	// the border of the polygon. If any of our attempts produces this result,
+	// we return false immediately.
+
+	std::vector<size_t> intersected_boundary_segments;
+	std::vector<IfcVector3> intersected_boundary_points;
+	size_t votes = 0;
+
+	bool is_border;
+	IntersectsBoundaryProfile(p, p + IfcVector3(1.0,0,0), boundary, 
+		intersected_boundary_segments, 
+		intersected_boundary_points, true, &is_border);
+
+	if(is_border) {
+		return false;
+	}
+
+	votes += intersected_boundary_segments.size() % 2;
+
+	intersected_boundary_segments.clear();
+	intersected_boundary_points.clear();
+
+	IntersectsBoundaryProfile(p, p + IfcVector3(0,1.0,0), boundary, 
+		intersected_boundary_segments, 
+		intersected_boundary_points, true, &is_border);
+
+	if(is_border) {
+		return false;
+	}
+
+	votes += intersected_boundary_segments.size() % 2;
+
+	intersected_boundary_segments.clear();
+	intersected_boundary_points.clear();
+
+	IntersectsBoundaryProfile(p, p + IfcVector3(0.6,-0.6,0.0), boundary, 
+		intersected_boundary_segments, 
+		intersected_boundary_points, true, &is_border);
+
+	if(is_border) {
+		return false;
+	}
+
+	votes += intersected_boundary_segments.size() % 2;
+	//ai_assert(votes == 3 || votes == 0);
+	return votes > 1;
+}
+
+
+// ------------------------------------------------------------------------------------------------
+void ProcessPolygonalBoundedBooleanHalfSpaceDifference(const IfcPolygonalBoundedHalfSpace* hs, TempMesh& result, 
+													   const TempMesh& first_operand, 
+													   ConversionData& conv)
+{
+	ai_assert(hs != NULL);
+
+	const IfcPlane* const plane = hs->BaseSurface->ToPtr<IfcPlane>();
+	if(!plane) {
+		IFCImporter::LogError("expected IfcPlane as base surface for the IfcHalfSpaceSolid");
+		return;
+	}
+
+	// extract plane base position vector and normal vector
+	IfcVector3 p,n(0.f,0.f,1.f);
+	if (plane->Position->Axis) {
+		ConvertDirection(n,plane->Position->Axis.Get());
+	}
+	ConvertCartesianPoint(p,plane->Position->Location);
+
+	if(!IsTrue(hs->AgreementFlag)) {
+		n *= -1.f;
+	}
+
+	n.Normalize();
+
+	// obtain the polygonal bounding volume
+	boost::shared_ptr<TempMesh> profile = boost::shared_ptr<TempMesh>(new TempMesh());
+	if(!ProcessCurve(hs->PolygonalBoundary, *profile.get(), conv)) {
+		IFCImporter::LogError("expected valid polyline for boundary of boolean halfspace");
+		return;
+	}
+
+	IfcMatrix4 proj_inv;
+	ConvertAxisPlacement(proj_inv,hs->Position);
+
+	// and map everything into a plane coordinate space so all intersection
+	// tests can be done in 2D space.
+	IfcMatrix4 proj = proj_inv;
+	proj.Inverse();
+
+	// clip the current contents of `meshout` against the plane we obtained from the second operand
+	const std::vector<IfcVector3>& in = first_operand.verts;
+	std::vector<IfcVector3>& outvert = result.verts;
+
+	std::vector<unsigned int>::const_iterator begin = first_operand.vertcnt.begin(), 
+		end = first_operand.vertcnt.end(), iit;
+
+	outvert.reserve(in.size());
+	result.vertcnt.reserve(first_operand.vertcnt.size());
+
+	std::vector<size_t> intersected_boundary_segments;
+	std::vector<IfcVector3> intersected_boundary_points;
+
+	// TODO: the following algorithm doesn't handle all cases. 
+	unsigned int vidx = 0;
+	for(iit = begin; iit != end; vidx += *iit++) {
+		if (!*iit) {
+			continue;
+		}
+
+		unsigned int newcount = 0;
+		bool was_outside_boundary = !PointInPoly(proj * in[vidx], profile->verts);
+
+		size_t last_intersected_boundary_segment;
+		IfcVector3 last_intersected_boundary_point;
+
+		bool extra_point_flag = false;
+		IfcVector3 extra_point;
+
+		for(unsigned int i = 0; i < *iit; ++i) {
+			// current segment: [i,i+1 mod size] or [*extra_point,i] if extra_point_flag is set
+			const IfcVector3& e0 = extra_point_flag ? extra_point : in[vidx+i];
+			const IfcVector3& e1 = extra_point_flag ? in[vidx+i] : in[vidx+(i+1)%*iit];
+
+			// does the current segment intersect the polygonal boundary?
+			const IfcVector3& e0_plane = proj * e0;
+			const IfcVector3& e1_plane = proj * e1;
+
+			intersected_boundary_segments.clear();
+			intersected_boundary_points.clear();
+
+			const bool is_outside_boundary = !PointInPoly(e1_plane, profile->verts);
+			const bool is_boundary_intersection = is_outside_boundary != was_outside_boundary;
+			
+			IntersectsBoundaryProfile(e0_plane, e1_plane, profile->verts, 
+				intersected_boundary_segments, 
+				intersected_boundary_points);
+		
+			ai_assert(!is_boundary_intersection || !intersected_boundary_segments.empty());
+
+			// does the current segment intersect the plane?
+			// (no extra check if this is an extra point)
+			IfcVector3 isectpos;
+			const Intersect isect =  extra_point_flag ? Intersect_No : IntersectSegmentPlane(p,n,e0,e1,isectpos);
+
+#ifdef _DEBUG
+			if (isect == Intersect_Yes) {
+				const IfcFloat f = fabs((isectpos - p)*n);
+				ai_assert(f < 1e-5);
+			}
+#endif
+
+			const bool is_white_side = (e0-p)*n >= -1e-6;
+
+			// e0 on good side of plane? (i.e. we should keep all geometry on this side)
+			if (is_white_side) {
+				// but is there an intersection in e0-e1 and is e1 in the clipping
+				// boundary? In this case, generate a line that only goes to the
+				// intersection point.
+				if (isect == Intersect_Yes  && !is_outside_boundary) {
+					outvert.push_back(e0);
+					++newcount;
+
+					outvert.push_back(isectpos);
+					++newcount;
+					
+					// this is, however, only a line that goes to the plane, but not
+					// necessarily to the point where the bounding volume on the
+					// black side of the plane is hit. So basically, we need another 
+					// check for [isectpos-e1], which should yield an intersection
+					// point.
+					extra_point_flag = true;
+					extra_point = isectpos;
+
+					//was_outside_boundary = true; 
+					//continue; 
+				}
+				else {
+					outvert.push_back(e0);
+					++newcount;
+				}
+			}
+			// e0 on bad side of plane, e1 on good (i.e. we should remove geometry on this side,
+			// but only if it is within the bounding volume).
+			else if (isect == Intersect_Yes) {
+				// is e0 within the clipping volume? Insert the intersection point
+				// of [e0,e1] and the plane instead of e0.
+				if(was_outside_boundary) {
+					outvert.push_back(e0);
+				}
+				else {
+					outvert.push_back(isectpos);
+				}
+				++newcount;
+			}
+			else { // no intersection with plane or parallel; e0,e1 are on the bad side
+			
+				// did we just pass the boundary line to the poly bounding?
+				if (is_boundary_intersection) {
+
+					// and are now outside the clipping boundary?
+					if (is_outside_boundary) {
+						// in this case, get the point where the clipping boundary
+						// was entered first. Then, get the point where the clipping
+						// boundary volume was left! These two points with the plane
+						// normal form another plane that intersects the clipping
+						// volume. There are two ways to get from the first to the
+						// second point along the intersection curve, try to pick the
+						// one that lies within the current polygon.
+
+						// TODO this approach doesn't handle all cases
+
+						// ...
+
+						IfcFloat d = 1e10;
+						IfcVector3 vclosest;
+						BOOST_FOREACH(const IfcVector3& v, intersected_boundary_points) {
+							const IfcFloat dn = (v-e1_plane).SquareLength();
+							if (dn < d) {
+								d = dn;
+								vclosest = v;
+							}
+						}
+
+						outvert.push_back(proj_inv * vclosest);
+						++newcount;
+
+						//outvert.push_back(e1);
+						//++newcount;
+					}
+					else {
+						// we just entered the clipping boundary. Record the point
+						// and the segment where we entered and also generate this point.
+						//last_intersected_boundary_segment = intersected_boundary_segments.front();
+						//last_intersected_boundary_point = intersected_boundary_points.front();
+
+						outvert.push_back(e0);
+						++newcount;
+
+						IfcFloat d = 1e10;
+						IfcVector3 vclosest;
+						BOOST_FOREACH(const IfcVector3& v, intersected_boundary_points) {
+							const IfcFloat dn = (v-e0_plane).SquareLength();
+							if (dn < d) {
+								d = dn;
+								vclosest = v;
+							}
+						}
+
+						outvert.push_back(proj_inv * vclosest);
+						++newcount;
+					}
+				}				
+				// if not, we just keep the vertex
+				else if (is_outside_boundary) {
+					outvert.push_back(e0);
+					++newcount;
+				}
+			}
+
+			was_outside_boundary = is_outside_boundary;
+			extra_point_flag = false;
+		}
+	
+		if (!newcount) {
+			continue;
+		}
+		
+		IfcVector3 vmin,vmax;
+		ArrayBounds(&*(outvert.end()-newcount),newcount,vmin,vmax);
+
+		// filter our IfcFloat points - those may happen if a point lies
+		// directly on the intersection line. However, due to IfcFloat
+		// precision a bitwise comparison is not feasible to detect
+		// this case.
+		const IfcFloat epsilon = (vmax-vmin).SquareLength() / 1e6f;
+		FuzzyVectorCompare fz(epsilon);
+
+		std::vector<IfcVector3>::iterator e = std::unique( outvert.end()-newcount, outvert.end(), fz );
+
+		if (e != outvert.end()) {
+			newcount -= static_cast<unsigned int>(std::distance(e,outvert.end()));
+			outvert.erase(e,outvert.end());
+		}
+		if (fz(*( outvert.end()-newcount),outvert.back())) {
+			outvert.pop_back();
+			--newcount;
+		} 
+		if(newcount > 2) {
+			result.vertcnt.push_back(newcount);
+		}
+		else while(newcount-->0) {
+			result.verts.pop_back();
+		}
+
+	}
+	IFCImporter::LogDebug("generating CSG geometry by plane clipping with polygonal bounding (IfcBooleanClippingResult)");	
+}
+
+// ------------------------------------------------------------------------------------------------
+void ProcessBooleanExtrudedAreaSolidDifference(const IfcExtrudedAreaSolid* as, TempMesh& result, 
+											   const TempMesh& first_operand, 
+											   ConversionData& conv)
+{
+	ai_assert(as != NULL);
+
+	// This case is handled by reduction to an instance of the quadrify() algorithm.
+	// Obviously, this won't work for arbitrarily complex cases. In fact, the first
+	// operand should be near-planar. Luckily, this is usually the case in Ifc 
+	// buildings.
+
+	boost::shared_ptr<TempMesh> meshtmp = boost::shared_ptr<TempMesh>(new TempMesh());
+	ProcessExtrudedAreaSolid(*as,*meshtmp,conv,false);
+
+	std::vector<TempOpening> openings(1, TempOpening(as,IfcVector3(0,0,0),meshtmp,boost::shared_ptr<TempMesh>()));
+
+	result = first_operand;
+
+	TempMesh temp;
+
+	std::vector<IfcVector3>::const_iterator vit = first_operand.verts.begin();
+	BOOST_FOREACH(unsigned int pcount, first_operand.vertcnt) {
+		temp.Clear();
+
+		temp.verts.insert(temp.verts.end(), vit, vit + pcount);
+		temp.vertcnt.push_back(pcount);
+
+		// The algorithms used to generate mesh geometry sometimes
+		// spit out lines or other degenerates which must be
+		// filtered to avoid running into assertions later on.
+
+		// ComputePolygonNormal returns the Newell normal, so the
+		// length of the normal is the area of the polygon.
+		const IfcVector3& normal = temp.ComputeLastPolygonNormal(false);
+		if (normal.SquareLength() < static_cast<IfcFloat>(1e-5)) {
+			IFCImporter::LogWarn("skipping degenerate polygon (ProcessBooleanExtrudedAreaSolidDifference)");
+			continue;
+		}
+
+		GenerateOpenings(openings, std::vector<IfcVector3>(1,IfcVector3(1,0,0)), temp, false, true);
+		result.Append(temp);
+
+		vit += pcount;
+	}
+
+	IFCImporter::LogDebug("generating CSG geometry by geometric difference to a solid (IfcExtrudedAreaSolid)");
+}
+
+// ------------------------------------------------------------------------------------------------
+void ProcessBoolean(const IfcBooleanResult& boolean, TempMesh& result, ConversionData& conv)
+{
+	// supported CSG operations:
+	//   DIFFERENCE
+	if(const IfcBooleanResult* const clip = boolean.ToPtr<IfcBooleanResult>()) {
+		if(clip->Operator != "DIFFERENCE") {
+			IFCImporter::LogWarn("encountered unsupported boolean operator: " + (std::string)clip->Operator);
+			return;
+		}
+
+		// supported cases (1st operand):
+		//  IfcBooleanResult -- call ProcessBoolean recursively
+		//  IfcSweptAreaSolid -- obtain polygonal geometry first
+
+		// supported cases (2nd operand):
+		//  IfcHalfSpaceSolid -- easy, clip against plane
+		//  IfcExtrudedAreaSolid -- reduce to an instance of the quadrify() algorithm
+
+
+		const IfcHalfSpaceSolid* const hs = clip->SecondOperand->ResolveSelectPtr<IfcHalfSpaceSolid>(conv.db);
+		const IfcExtrudedAreaSolid* const as = clip->SecondOperand->ResolveSelectPtr<IfcExtrudedAreaSolid>(conv.db);
+		if(!hs && !as) {
+			IFCImporter::LogError("expected IfcHalfSpaceSolid or IfcExtrudedAreaSolid as second clipping operand");
+			return;
+		}
+
+		TempMesh first_operand;
+		if(const IfcBooleanResult* const op0 = clip->FirstOperand->ResolveSelectPtr<IfcBooleanResult>(conv.db)) {
+			ProcessBoolean(*op0,first_operand,conv);
+		}
+		else if (const IfcSweptAreaSolid* const swept = clip->FirstOperand->ResolveSelectPtr<IfcSweptAreaSolid>(conv.db)) {
+			ProcessSweptAreaSolid(*swept,first_operand,conv);
+		}
+		else {
+			IFCImporter::LogError("expected IfcSweptAreaSolid or IfcBooleanResult as first clipping operand");
+			return;
+		}
+
+		if(hs) {
+
+			const IfcPolygonalBoundedHalfSpace* const hs_bounded = clip->SecondOperand->ResolveSelectPtr<IfcPolygonalBoundedHalfSpace>(conv.db);
+			if (hs_bounded) {
+				ProcessPolygonalBoundedBooleanHalfSpaceDifference(hs_bounded, result, first_operand, conv);
+			}
+			else {
+				ProcessBooleanHalfSpaceDifference(hs, result, first_operand, conv);
+			}
+		}
+		else {
+			ProcessBooleanExtrudedAreaSolidDifference(as, result, first_operand, conv);
+		}
+	}
+	else {
+		IFCImporter::LogWarn("skipping unknown IfcBooleanResult entity, type is " + boolean.GetClassName());
+	}
+}
+
+} // ! IFC
+} // ! Assimp
+
+#endif 
+
--- a/code/ObjFileData.h
+++ b/code/ObjFileData.h
@ -157,6 +157,7 @@ struct Material
 	aiString textureSpecular;
 	aiString textureAmbient;
 	aiString textureBump;
+	aiString textureNormal;
 	aiString textureSpecularity;
 	aiString textureOpacity;
 	aiString textureDisp;
--- a/code/ObjFileImporter.cpp
+++ b/code/ObjFileImporter.cpp
@ -556,6 +556,9 @@ void ObjFileImporter::createMaterials(const ObjFile::Model* pModel, aiScene* pSc
 		if ( 0 != pCurrentMaterial->textureBump.length )
 			mat->AddProperty( &pCurrentMaterial->textureBump, AI_MATKEY_TEXTURE_HEIGHT(0));

+		if ( 0 != pCurrentMaterial->textureNormal.length )
+			mat->AddProperty( &pCurrentMaterial->textureNormal, AI_MATKEY_TEXTURE_NORMALS(0));
+
 		if ( 0 != pCurrentMaterial->textureDisp.length )
 			mat->AddProperty( &pCurrentMaterial->textureDisp, AI_MATKEY_TEXTURE_DISPLACEMENT(0) );

--- a/code/ObjFileMtlImporter.cpp
+++ b/code/ObjFileMtlImporter.cpp
@ -49,6 +49,18 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 namespace Assimp	{

+// Material specific token
+static const std::string DiffuseTexture      = "map_kd";
+static const std::string AmbientTexture      = "map_ka";
+static const std::string SpecularTexture     = "map_ks";
+static const std::string OpacityTexture      = "map_d";
+static const std::string BumpTexture1        = "map_bump";
+static const std::string BumpTexture2        = "map_Bump";
+static const std::string BumpTexture3        = "bump";
+static const std::string NormalTexture       = "map_Kn";
+static const std::string DisplacementTexture = "disp";
+static const std::string SpecularityTexture  = "map_ns";
+
 // -------------------------------------------------------------------
 //	Constructor
 ObjFileMtlImporter::ObjFileMtlImporter( std::vector<char> &buffer, 
@ -249,46 +261,40 @@ void ObjFileMtlImporter::createMaterial()

 // -------------------------------------------------------------------
 //	Gets a texture name from data.
-void ObjFileMtlImporter::getTexture()
-{
-	aiString *out = NULL;
+void ObjFileMtlImporter::getTexture() {
+	aiString *out( NULL );

-	// FIXME: just a quick'n'dirty hack, consider cleanup later
-
-	// Diffuse texture
-	if (!ASSIMP_strincmp(&(*m_DataIt),"map_kd",6))
+	const char *pPtr( &(*m_DataIt) );
+	if ( !ASSIMP_strincmp( pPtr, DiffuseTexture.c_str(), DiffuseTexture.size() ) ) {
+		// Diffuse texture
 		out = & m_pModel->m_pCurrentMaterial->texture;
-
-	// Ambient texture
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"map_ka",6))
+	} else if ( !ASSIMP_strincmp( pPtr,AmbientTexture.c_str(),AmbientTexture.size() ) ) {
+		// Ambient texture
 		out = & m_pModel->m_pCurrentMaterial->textureAmbient;
-
-	// Specular texture
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"map_ks",6))
+	} else if (!ASSIMP_strincmp( pPtr, SpecularTexture.c_str(), SpecularTexture.size())) {
+		// Specular texture
 		out = & m_pModel->m_pCurrentMaterial->textureSpecular;
-
-	// Opacity texture
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"map_d",5))
+	} else if ( !ASSIMP_strincmp( pPtr, OpacityTexture.c_str(), OpacityTexture.size() ) ) {
+		// Opacity texture
 		out = & m_pModel->m_pCurrentMaterial->textureOpacity;
-
-	// Ambient texture
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"map_ka",6))
+	} else if (!ASSIMP_strincmp( pPtr,"map_ka",6)) {
+		// Ambient texture
 		out = & m_pModel->m_pCurrentMaterial->textureAmbient;
-
-	// Bump texture
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"map_bump",8) || !ASSIMP_strincmp(&(*m_DataIt),"bump",4))
+	} else if ( !ASSIMP_strincmp( pPtr, BumpTexture1.c_str(), BumpTexture1.size() ) ||
+		        !ASSIMP_strincmp( pPtr, BumpTexture2.c_str(), BumpTexture2.size() ) || 
+		        !ASSIMP_strincmp( pPtr, BumpTexture3.c_str(), BumpTexture3.size() ) ) {
+		// Bump texture 
 		out = & m_pModel->m_pCurrentMaterial->textureBump;
-
-	// Displacement texture
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"disp",4))
+	} else if (!ASSIMP_strincmp( pPtr,NormalTexture.c_str(), NormalTexture.size())) { 
+		// Normal map
+		out = & m_pModel->m_pCurrentMaterial->textureNormal;
+	} else if (!ASSIMP_strincmp( pPtr, DisplacementTexture.c_str(), DisplacementTexture.size() ) ) {
+		// Displacement texture
 		out = &m_pModel->m_pCurrentMaterial->textureDisp;
-
-	// Specularity scaling (glossiness)
-	else if (!ASSIMP_strincmp(&(*m_DataIt),"map_ns",6))
+	} else if (!ASSIMP_strincmp( pPtr, SpecularityTexture.c_str(),SpecularityTexture.size() ) ) {
+		// Specularity scaling (glossiness)
 		out = & m_pModel->m_pCurrentMaterial->textureSpecularity;
-
-	else
-	{
+	} else {
 		DefaultLogger::get()->error("OBJ/MTL: Encountered unknown texture type");
 		return;
 	}
--- a/code/STEPFileEncoding.cpp
+++ b/code/STEPFileEncoding.cpp
@ -300,7 +300,7 @@ bool STEP::StringToUTF8(std::string& s)
 			}
 			// \X\xx - mac/roman (xx is a hex sequence)
 			else if (i+4 < s.size() && s[i+1] == 'X' && s[i+2] == '\\') {
-				
+
 				const uint8_t macval = HexOctetToDecimal(s.c_str() + i + 3);
 				if(macval < 0x20) {
 					return false;
@ -329,17 +329,17 @@ bool STEP::StringToUTF8(std::string& s)
 					// utf16
 				case '2':
 					// utf32
-				case '4':						
+				case '4':
 					if (s[i+3] == '\\') {
 						const size_t basei = i+4;
-						// scan for \X0\ 
-						size_t j = basei, jend = s.size()-4;
+						size_t j = basei, jend = s.size()-4;						
+
 						for (; j < jend; ++j) {
 							if (s[j] == '\\' && s[j] == 'X' && s[j] == '0' && s[j] == '\\') {
 								break;
 							}
 						}
-						if (j == jend) {						
+						if (j == jend) {
 							return false;
 						}

@ -347,12 +347,12 @@ bool STEP::StringToUTF8(std::string& s)
 							s.erase(i,8);
 							continue;
 						}
-						
+
 						if (s[i+2] == '2') {
 							if (((j - basei) % 4) != 0) {
 								return false;
 							}
-							
+
 							const size_t count = (j-basei)/4;
 							boost::scoped_array<UTF16> src(new UTF16[count]);

--- a/code/STLLoader.cpp
+++ b/code/STLLoader.cpp
@ -382,7 +382,7 @@ bool STLImporter::LoadBinaryFile()

 				DefaultLogger::get()->info("STL: Mesh has vertex colors");
 			}
-			aiColor4D* clr = &pMesh->mColors[0][pMesh->mNumFaces*3];
+			aiColor4D* clr = &pMesh->mColors[0][i*3];
 			clr->a = 1.0f;
 			if (bIsMaterialise) // fuck, this is reversed
 			{
--- a/include/assimp/anim.h
+++ b/include/assimp/anim.h
@ -457,7 +457,7 @@ struct Interpolator	 <aiVectorKey>	{

 template <>
 struct Interpolator <aiQuatKey>		{
-	void operator () (aiQuaternion& out, const aiQuatKey a,
+	void operator () (aiQuaternion& out, const aiQuatKey& a,
 		const aiQuatKey& b, float d) const
 	{
 		Interpolator<aiQuaternion> ipl;
@ -467,7 +467,7 @@ struct Interpolator <aiQuatKey>		{

 template <>
 struct Interpolator <aiMeshKey>		{
-	void operator () (unsigned int& out, const aiMeshKey a,
+	void operator () (unsigned int& out, const aiMeshKey& a,
 		const aiMeshKey& b, float d) const
 	{
 		Interpolator<unsigned int> ipl;
--- a/workspaces/vc9/assimp.vcproj
+++ b/workspaces/vc9/assimp.vcproj
@ -1967,6 +1967,10 @@
 				<Filter
 					Name="ifc"
 					>
+					<File
+						RelativePath="..\..\code\IfcBoolean.cpp"
+						>
+					</File>
 					<File
 						RelativePath="..\..\code\IFCCurve.cpp"
 						>
@ -1987,6 +1991,10 @@
 						RelativePath="..\..\code\IFCMaterial.cpp"
 						>
 					</File>
+					<File
+						RelativePath="..\..\code\IFCOpenings.cpp"
+						>
+					</File>
 					<File
 						RelativePath="..\..\code\IFCProfile.cpp"
 						>
@ -2019,6 +2027,14 @@
 						RelativePath="..\..\code\STEPFile.h"
 						>
 					</File>
+					<File
+						RelativePath="..\..\code\STEPFileEncoding.cpp"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\STEPFileEncoding.h"
+						>
+					</File>
 					<File
 						RelativePath="..\..\code\STEPFileReader.cpp"
 						>