If I convert the world coords into window coords with gluProject, I get WinX, WinY and WinZ??? WinZ??? How do I use that???
/Thanx…
For hidden texture removal maybe?
Winz. it’s the hacker’s form of windoze. 
(i mean, it’s kewl, dudez, to uze winz
speaking seriously (which is the best way to speak, really), winz is a value between 0.0 and 1.0 representing the ratio in the view frustum. ie. all points on the far plane have a winz of 1.0, all points on the near plane have a winz of 0.0, and all points in between have… well… a value inbetween 0.0 and 1.0.
(i can’t remember if it’s linea.r no… it isn’t. of course it isn’t… shutup, john
cheers
John