hi there ok maybe it seems to be a stupid question (yeah ok it is), but how can I find the Z value from a vertex ive sent to ogl ? do I need to calculate the matrices myself without using glRotate and glTranslate, then getting a vector from them ? it would work but there must be a better way ... now some people will ask why I''m sorting ... to have proper blending/collision of course ! also I''m using vertex arrays.

Check out: gluProject, gluUnProject

Oztan

you can also multiply your point with combined modelview and projection matrix to get final position on screeen (and depth). Remember that reading back anything from video card is SLOW so you''re better of just calculating it yourself.

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