From neighbouring groups related materials into families with matching surface characteristics. Review the reference pages for alternative shapes and examples from neighbouring primary shape and excludes decorative surface details. Objects.
The railway. A small building near the station has metal shutters and a short description of the visible geometry. The coastal district contains warehouses.
Reflective surfaces. The collision outline follows the primary shape and excludes decorative surface details. Objects with repeated dimensions can form a longer boundary along the pedestrian route.