Fading light

What texture/entity is used to make the fading light which can be used with things like windows.

Help appreciated.

Do you mean like in the coast levels? where if you approached the
window you could see through it, but when you backed away from it it
would be a bright light? Thats area portals I believe.

hmm what i thought he was talking about, and what i would like to know, is the effect in de_train where there are light rays coming from the windows and the ceiling in the inside bomb site.

hmm what i thought he was talking about, and what i would like
to know, is the effect in de_train where there are light rays coming
from the windows and the ceiling in the inside bomb site.

Very fine dustmotes was how it was done.

Thanks omega, yea it's like in de_train is what I was after.

Omega could you change your answer to a solution to a prob, so that this thread has an answer.