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Use fuzzy boolean subtraction if available

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Remove collinear points from polygonal halfspace boundary
Lookup styled items on boolean operation operands

Fixes https://github.com/IfcOpenShell/IfcOpenShell/issues/6
Fixes https://sourceforge.net/p/ifcopenshell/discussion/1782717/thread/a7f99e41/?limit=25#5c36
This commit is contained in:
aothms
2016-01-22 17:27:28 +01:00
parent a0db3a3406
commit 4be7da1a43
4 changed files with 181 additions and 7 deletions
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src/ifcgeom/IfcGeomShapes.cpp
+40 -3
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@@ -249,10 +249,20 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcHalfSpaceSolid* l, TopoDS_Shap
bool IfcGeom::Kernel::convert(const IfcSchema::IfcPolygonalBoundedHalfSpace* l, TopoDS_Shape& shape) {
TopoDS_Shape halfspace;
if ( ! IfcGeom::Kernel::convert((IfcSchema::IfcHalfSpaceSolid*)l,halfspace) ) return false;
TopoDS_Wire wire;
if ( ! convert_wire(l->PolygonalBoundary(),wire) || ! wire.Closed() ) return false;
if ( ! convert_wire(l->PolygonalBoundary(),wire) || ! wire.Closed() ) return false;
gp_Trsf trsf;
convert(l->Position(),trsf);
if ( ! convert(l->Position(),trsf) ) return false;
TColgp_SequenceOfPnt points;
if (wire_to_sequence_of_point(wire, points)) {
remove_duplicate_points_from_loop(points, wire.Closed()); // Note: wire always closed, as per if statement above
remove_collinear_points_from_loop(points, wire.Closed());
sequence_of_point_to_wire(points, wire, wire.Closed());
}
TopoDS_Shape prism = BRepPrimAPI_MakePrism(BRepBuilderAPI_MakeFace(wire),gp_Vec(0,0,200));
gp_Trsf down; down.SetTranslation(gp_Vec(0,0,-100.0));
prism.Move(trsf*down);
@@ -277,6 +287,7 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcShellBasedSurfaceModel* l, Ifc
}
bool IfcGeom::Kernel::convert(const IfcSchema::IfcBooleanResult* l, TopoDS_Shape& shape) {
TopoDS_Shape s1, s2;
IfcRepresentationShapeItems items1, items2;
TopoDS_Wire boundary_wire;
@@ -330,10 +341,36 @@ bool IfcGeom::Kernel::convert(const IfcSchema::IfcBooleanResult* l, TopoDS_Shape
const IfcSchema::IfcBooleanOperator::IfcBooleanOperator op = l->Operator();
/*
// TK: A little debugging trick to output both operands for visual inspection
BRep_Builder builder;
TopoDS_Compound compound;
builder.MakeCompound(compound);
builder.Add(compound, s1);
builder.Add(compound, s2);
shape = compound;
return true;
*/
if (op == IfcSchema::IfcBooleanOperator::IfcBooleanOperator_DIFFERENCE) {
bool valid_cut = false;
BRepAlgoAPI_Cut brep_cut(s1,s2);
#if OCC_VERSION_HEX < 0x60900
BRepAlgoAPI_Cut brep_cut(s1, s2);
#else
BRepAlgoAPI_Cut brep_cut;
TopTools_ListOfShape s1s;
s1s.Append(s1);
TopTools_ListOfShape s2s;
s2s.Append(s2);
brep_cut.SetFuzzyValue(getValue(GV_PRECISION));
brep_cut.SetArguments(s1s);
brep_cut.SetTools(s2s);
brep_cut.Build();
#endif
if ( brep_cut.IsDone() ) {
TopoDS_Shape result = brep_cut;