Constraining a Space Object 3d to dormer ceiling above creates some voids.  Ceiling/roof above the voids is not missing. Is this a problem with dormer config? Or, some of the ceiling areas are not actually part of the Roof object? Or?   One workaround is to view roof from bottom and extract all the ceiling surfaces, then raise the space object to the extraction instead of to the roof object ceiling. But then, if roof edited, need new extraction.   -B