This is a bug that we know about, the cut surfaces are treated as an outer surface and projected with cover fills. I can’t say anything about the schedule when will it be corrected, please contact support for information.
There is a rather complicated workaround:
– each piece of the model that has the same building material can be projected using parameters to model only that part, fills overridden with the attributes from a “Building_Material_info” request.
– the visible and overhead parts have to be projected in a separate call, they show correctly only with a full model.
For an example see “CWFrameRegDouble” macro.
Library Platform, Software Engineer