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Detect cases where Newell's Method returns a zero-length vector and make no attempt to normalize it in order to prevent an exception. In this case the face will be flagged as invalid down the road, because its perimeter doesn't span any area.

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Thomas Krijnen
2014-06-11 10:32:15 +00:00
parent f3622f9339
commit 79839d487a
1 changed files with 6 additions and 3 deletions
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src/ifcgeom/IfcGeomFaces.cpp
+6 -3
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@@ -170,9 +170,12 @@ bool IfcGeom::convert(const Ifc2x3::IfcFace::ptr l, TopoDS_Face& face) {
// as the topological face normal the face orientation is
// reversed
gp_Vec face_normal2(x,y,z);
if ( face_normal1.Dot(face_normal2) < 0 ) {
TopAbs_Orientation o = face.Orientation();
face.Orientation(o == TopAbs_FORWARD ? TopAbs_REVERSED : TopAbs_FORWARD);
if (face_normal2.Magnitude() > ALMOST_ZERO) {
if ( face_normal1.Dot(face_normal2) < 0 ) {
TopAbs_Orientation o = face.Orientation();
face.Orientation(o == TopAbs_FORWARD ? TopAbs_REVERSED : TopAbs_FORWARD);
}
}
}