building=roof default min_height

[Nzara]

Currently rendering a building=roof seems to be rendered the same way as other buildings. That makes them appear as a solid blocks raising from the ground as long as no min_height is assigned (most of the cases). Assuming a default of min_height=(height-0.1) will render them much more realistic.

[kendzi]

Does other 3D renders use it as default?

[tordanik]

Does other 3D renders use it as default?

OSM2World has special treatment for building=roof and building:part=roof built in, the relevant code is here. The default thickness is currently 30 cm, but that number is ultimately rather arbitrary.