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Prevent a construction error when trying to normalize a zero length normal during triangulation, which happens very, very rarely.

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Thomas Krijnen
2014-03-22 10:48:29 +00:00
parent a5e466b53a
commit fa195194c6
1 changed files with 5 additions and 2 deletions
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src/ifcgeom/IfcGeomObjects.cpp
+5 -2
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@@ -175,8 +175,11 @@ IfcGeomObjects::IfcRepresentationTriangulation::IfcRepresentationTriangulation(c
const gp_Pnt2d& uv = uvs(i);
gp_Pnt p;
gp_Vec normal_direction;
prop.Normal(uv.X(),uv.Y(),p,normal_direction);
gp_Dir normal = gp_Dir(normal_direction.XYZ() * rotation_matrix);
prop.Normal(uv.X(),uv.Y(),p,normal_direction);
gp_Vec normal(0., 0., 0.);
if (normal_direction.Magnitude() > ALMOST_ZERO) {
normal = gp_Dir(normal_direction.XYZ() * rotation_matrix);
}
_normals.push_back((float)normal.X());
_normals.push_back((float)normal.Y());
_normals.push_back((float)normal.Z());