The current behaviour is that a block wall, when exported to an IFC, is exported as whatever you choose it to be, but it loses its individual block geometry in the process.
I am unsure what is the more "correct" approach and what has the most "benefit" for various usecases. The questions are:
1. Should it be an IfcWallStandardCase? It certainly can be simplified as such, and this is what Revit does. This is not, however, a true representation. This limits the benefit of the IFC for purposes such as lighting simulation, and block setouts. It may lose valuable QS information in terms of number of blocks.
2. How do you export it as an IfcWallElementedCase?
Similarly, has anybody built a stud wall yet which exports as a correctly defined IfcWallElementedCase?
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