Applied Patch #3509752 by mv2ax

Made the sewing of TopoDS_Shells into a IfcGeomObjects::Setting
Limit the maximum number of faces a shell to be sewed

src/ifcgeom/IfcGeom.h

@@ -50,7 +50,9 @@
 // Specifies the treshold distance under which cartesian points are deemed equal
 #define POINT_EQUALITY_TOLERANCE 0.000001
 
-#define FACESET_AS_COMPOUND 1
+// Specifies maximum number of faces for a shell to be sewed. Sewing shells
+// that consist of many faces is really detrimental for the performance.
+#define MAX_FACES_TO_SEW 100
 
 namespace IfcGeom {
 	bool convert_wire_to_face(const TopoDS_Wire& wire, TopoDS_Face& face);

src/ifcgeom/IfcGeomObjects.cpp

@@ -25,7 +25,6 @@
 #include <gp_GTrsf2d.hxx>
 #include <gp_Trsf.hxx>
 #include <gp_Trsf2d.hxx>
-#include <gp_Quaternion.hxx>
 #include <TopoDS_Compound.hxx>
 #include <BRep_Builder.hxx>
 #include <BRepTools.hxx>
@@ -522,6 +521,9 @@ void IfcGeomObjects::Settings(int setting, bool value) {
 	case USE_BREP_DATA:
 		use_brep_data = value;
 		break;
+	case SEW_SHELLS:
+		Ifc::SewShells = value;
+		break;
 	}
 }
 int IfcGeomObjects::Progress() {

src/ifcgeom/IfcGeomObjects.h

@@ -38,9 +38,7 @@
  *   IfcGeomObject.matrix is a 4x3 matrix that defines the orientation and      *
  *     translation of the mesh in relation to the world origin                  *
  *                                                                              *
- * Init(char* fn, bool world_coords) parses the IFC file in fn, returns true    *
- *   on succes, world_coords = true will result in all IfcGeomObject.matrix     *
- *   being an identity matrix and IfcMesh.verts containing global positions     *
+ * Init(char* fn) parses the IFC file in fn, returns true on succes.            *
  *                                                                              *
  * Get() returns a pointer to the current IfcGeomObject                         *
  *                                                                              * 
@@ -69,13 +67,37 @@
 
 namespace IfcGeomObjects {
 
-	const int WELD_VERTICES = 1;
-	const int USE_WORLD_COORDS = 2;
-	const int CONVERT_BACK_UNITS = 3;
-	const int USE_BREP_DATA = 4;
+	// Enumeration of setting identifiers. These settings define the
+	// behaviour of various aspects of IfcOpenShell.
 
+	// Specifies whether vertices are welded, meaning that the coordinates
+	// vector will only contain unique xyz-triplets. This results in a 
+	// manifold mesh which is useful for modelling applications, but might 
+	// result in unwanted shading artifacts in rendering applications.
+	const int WELD_VERTICES = 1;
+	// Specifies whether to apply the local placements of building elements
+	// directly to the coordinates of the representation mesh rather than
+	// to represent the local placement in the 4x3 matrix, which will in that
+	// case be the identity matrix.
+	const int USE_WORLD_COORDS = 2;
+	// Internally IfcOpenShell measures everything in meters. This settings
+	// specifies whether to convert IfcGeomObjects back to the units in which
+	// the geometry in the IFC file is specified.
+	const int CONVERT_BACK_UNITS = 3;
+	// Specifies whether to use the Open Cascade BREP format for representation
+	// items rather than to create triangle meshes. This is useful is IfcOpenShell
+	// is used as a library in an application that is also built on Open Cascade.
+	const int USE_BREP_DATA = 4;
+	// Specifies whether to sew IfcConnectedFaceSets (open and closed shells) to
+	// TopoDS_Shells or whether to keep them as a loose collection of faces.
+	const int SEW_SHELLS = 5;
+
+	// End of settings enumeration.
+
+	// Some typedefs for convenience
 	typedef std::vector<int>::const_iterator IntIt;
 	typedef std::vector<double>::const_iterator FltIt;
+	// A nested pair of doubles to be able to store an XYZ coordinate in a map.
 	typedef std::pair< double,std::pair<double,double> > VertKey;
 	typedef std::map<VertKey,int> VertKeyMap;
 	typedef std::pair<int,int> Edge;

src/ifcgeom/IfcGeomShapes.cpp

@@ -71,8 +71,6 @@
 #include <ShapeFix_ShapeTolerance.hxx>
 #include <ShapeFix_Solid.hxx>
 
-#include <BRepFilletAPI_MakeFillet2d.hxx>
-
 #include <TopLoc_Location.hxx>
 
 #include <BRepCheck_Analyzer.hxx>
@@ -293,41 +291,45 @@ bool IfcGeom::convert(const Ifc2x3::IfcBooleanClippingResult::ptr l, TopoDS_Shap
 
 }
 bool IfcGeom::convert(const Ifc2x3::IfcConnectedFaceSet::ptr l, TopoDS_Shape& shape) {
-#ifdef FACESET_AS_COMPOUND
-	TopoDS_Compound compound;
-	BRep_Builder builder;
-	builder.MakeCompound(compound);
-#else
-	BRepOffsetAPI_Sewing builder;
-	builder.SetTolerance(0.01);
-#endif
 	Ifc2x3::IfcFace::list faces = l->CfsFaces();
 	bool facesAdded = false;
-	for( Ifc2x3::IfcFace::it it = faces->begin(); it != faces->end(); ++ it ) {
-		TopoDS_Face face;
-		if ( IfcGeom::convert_face(*it,face) ) {
-#ifdef FACESET_AS_COMPOUND
-			builder.Add(compound,face);
-#else
-			builder.Add(face);
-#endif
-			facesAdded = true;
-		} else {
-			Ifc::LogMessage("Warning","Invalid face:",(*it)->entity);
+	const unsigned int num_faces = faces->Size();
+	if ( Ifc::SewShells && num_faces < MAX_FACES_TO_SEW ) {
+		BRepOffsetAPI_Sewing builder;
+		builder.SetTolerance(0.01);
+		for( Ifc2x3::IfcFace::it it = faces->begin(); it != faces->end(); ++ it ) {
+			TopoDS_Face face;
+			if ( IfcGeom::convert_face(*it,face) ) {
+				builder.Add(face);
+				facesAdded = true;
+			} else {
+				Ifc::LogMessage("Warning","Invalid face:",(*it)->entity);
+			}
 		}
+		if ( ! facesAdded ) return false;
+		builder.Perform();
+		shape = builder.SewedShape();
+		try {
+			ShapeFix_Solid solid;
+			solid.LimitTolerance(0.01);
+			shape = solid.SolidFromShell(TopoDS::Shell(shape));
+		} catch(...) {}
+	} else {
+		TopoDS_Compound compound;
+		BRep_Builder builder;
+		builder.MakeCompound(compound);
+		for( Ifc2x3::IfcFace::it it = faces->begin(); it != faces->end(); ++ it ) {
+			TopoDS_Face face;
+			if ( IfcGeom::convert_face(*it,face) ) {
+				builder.Add(compound,face);
+				facesAdded = true;
+			} else {
+				Ifc::LogMessage("Warning","Invalid face:",(*it)->entity);
+			}
+		}
+		if ( ! facesAdded ) return false;
+		shape = compound;
 	}
-	if ( ! facesAdded ) return false;
-#ifdef FACESET_AS_COMPOUND
-	shape = compound;
-#else
-	builder.Perform();
-	shape = builder.SewedShape();
-	try {
-		ShapeFix_Solid solid;
-		solid.LimitTolerance(0.01);
-		shape = solid.SolidFromShell(TopoDS::Shell(shape));
-	} catch(...) {}
-#endif
 	return true;
 }
 bool IfcGeom::convert(const Ifc2x3::IfcMappedItem::ptr l, ShapeList& shapes) {