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ifcOpenShell; How to get the surface of wall openings?

1. B by Borna_Molnar on 14 Apr 2021, edited 14 Apr 2021 #

   I am trying to use IfcOpenShell for QTO. As the title says I am trying to get the surface of the wall openings.

   I used the dir() method a lot and got from a IfcWall instance with "HasOpening" to a IfcRelVoidsElement and then with "RelatedOpeningElement" to IfcOpeningElement.

   https://standards.buildingsmart.org/IFC/RELEASE/IFC2x3/TC1/HTML/ifcproductextension/lexical/ifcopeningelement.htm

   According to the literature the quantites of an IfcOpeningElement are defined by the IfcElementQuantity. But if I try the IsDefinedBy method on a Opening I get nothing.

   What am I missing? Is there a simpler way to do this?

2. M by Moult on 14 Apr 2021 # +1 votes

   An easier way to get properties of an opening (or any element) is:

   
   ifcopenshell.util.element.get_psets(opening)
   

   See if you find quantities in there. If not, then you need to do a bit of geometric analysis.

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