[gameprogrammer] Portals (3d)

Hey, does anyone know any good tutorials or books on how to do 3d portals?
I've found a few which talk a little about theory, but i need some code 
examples or atleast pseudo code w/ explanations on how to clip frustums against 
portals, how to handle mirrors w/ zbuffering and that kinda stuff.

Google doesnt seem to be giving anything useful on this one and i cant find 
anything in "game programming gems" 1 through 3.

Thank you!
Atrix


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