Topic Title

I create a 3d model , but none of the vertical slab cast shadows in gl shader
, the lights are on, only 3d furniture cast shadows.

What its wrong?

You need to specify which objects will receive shadows. Select F9 (Shadow Plane) from the Shader menu and select entities which will receive shadows. Selected objects that are supposed to receive shadows will display in highlight mode, as long as you are in this sub-menu.