I just can not understand: is it possible to make lighting from the sun and other light sources penetrate the model only through windows, as if this room was made of brushes.
Ie at the moment the model only gives a shadow under itself and that’s it. It is fully illuminated as something unified, not as a room.
It seems that it is not possible to create a room from the model and you should use the usual mapping for the basic geometry.
I used these options for vrad, but that does not help.
-staticproppolys -textureshadows -staticproplighting
I even pointed $nocull 1 to vmt, all textures used, but that did not help either.
1st screenshot - just a model
2nd screenshot - this same model, but around it is built a brush room.
P.S. - this is Garry’s Mod