IFC4.3.x-development
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added "solid model | closed shell"
conceptually, i could be missing something, however.
@pjanck IfcRelInterferesElements uses connection geometry to express the interference geometry which could be the volumetric boolean subtraction between elements.
http://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRelInterferesElements.htm uses
I see. Thank you for the explanations, @theoryshaw and @aothms . My comment above is thus resolved.