Title. This material (the metal grates), which can be found under materials/metalgrate001a, doesn't cast shadows on the walls. I've added the same texture to the bottom of the brush that has the top covered in said texture, in the hopes that it would cast a shadow on the walls, however, it does not. Do I have to edit a .vmt or do I have to make a lights.rad file next to the default lighting file to force the material to cast shadows via the alpha channel? I'm using the VBCT for the compiling, otherwise my computer becomes unusable.