exclude polygons during triangle mesh export

Author: ifcapps

src/cpp/web-ifc/geometry/IfcGeometryLoader.cpp

@@ -3338,8 +3338,10 @@ IfcProfile IfcGeometryLoader::GetProfile(uint32_t expressID) const
 
   glm::dmat4 IfcGeometryLoader::GetLocalPlacement(uint32_t expressID) const
   {
-    if(_expressIDToPlacement.contains(expressID)) {
-      return _expressIDToPlacement[expressID];
+	auto itFind = _expressIDToPlacement.find(expressID);
+	if (itFind != _expressIDToPlacement.end())
+	{
+	  return itFind->second;
     }
     else
     {

src/cpp/web-ifc/geometry/IfcGeometryProcessor.cpp

@@ -1607,6 +1607,10 @@ namespace webifc::geometry
 
 
             auto geom = _expressIDToGeometry[composedMesh.expressID];
+			if (geom.isPolygon)
+			{
+				return;        // only triangles here
+			}
             if (geometry.testReverse()) geom.ReverseFaces();
 
             auto translation = glm::dmat4(1.0);