Günter Holzeder

I don't think this is a geometry engine issue. The bounding box of the IfcSlab is overlapping the roof. If you delete the reference to the bounding box in the...

This area is like "THE aMAZEing LABYRINTH". Please look ahead for a maximum of compatibility. Thanks for investigation to all!

... and health and endurance to all of us

I also had several problems which stack overflow errors. Commit [24d2d6a](https://github.com/xBimTeam/XbimGeometry/commit/24d2d6a45b4683f3b6b1580779fc68e0ec6651dc) is the cure for me too. In my opinion the develop branch has some important things to be merged...

@JOuellette-Autodesk In my opinion the mapping between IfcMaterialConstituent and IfcShapeAspect ist a design weakness in IFC. No matter if you are using layers with the same material (name), each layer...

In the given sample above there are unique names to the IfcMaterialConstituents (numbers in brackets) but not for their according geometries (IfcShapeAspects). So this is the missing mapping of both....

@JOuellette-Autodesk This is the description from the IFC documentation ([IFC4 ADD2 TC1](https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/)) _IfcMaterialConstituent is a single and identifiable part of an element which is constructed of a number of part...

@JOuellette-Autodesk Our problem ist to identify the layer geometry by generic procedures, not to get QTOs from IFC. We are calculating quantities from geometries by ourselves.

Hi, are there any news about the problem (bug) described above? There are other issues about the same. #517

@AngelVelezSosa Why closed? Please give me time to validate the fix.