Quake3World

Is it possible to get a door to use rgbGen lightingDiffuse in its shaders to be lightgrid-lit for correct lighting when they open/close? Any time I try rgbGen lightingDiffuse on a world surface it ends up being completely black, or working only sometimes.

lightingDiffuse is designed to work with player and weapon models with the lightgrid for vertex illumination. So, no.

If I recall correctly, I hacked something into ET that forced brush model entities through the same lightgrid path as other entities so this could be possible. Was possible to use it as a multiplier against the lightmap to get rough dynamic lighting on doors/platforms.

Well, are you talking about the code in ET or something actually possible with shaders/map techniques?