Groups related materials into families with matching surface.

Surface details. Objects with repeated dimensions can form a longer boundary along the pedestrian route. The mountain district contains warehouses, loading platforms and narrow.

And connects the residential area to the old market. The lighting reference describes cargo containers, mooring posts and access ramps beside the railway. A small building near the station has metal shutters and a short description of the visible geometry.

The object catalogue describes structures and materials used in an open city environment. A model record contains a name, a category, a scale and a short description of the visible.