I just say one of my competitor's CC model. It was nicely trimmed according to an irregular shape of the site.
Does anyone know how to do it?
Best I know is to export the mesh (OBJ) .. edit .. bring it back in .. each and every tile.
I have passed on, internally through my support contact, a feature request, to add a boundary feature via KML or similar, such that the mesh builds up to the boundary ..
If there is another way - would love to hear it!