On Thursday, 4 November 2004 22:02, Aaron Wilson
> NeHe has a good example of how to convert
the screen coordinates
> into OpenGL coordinates.
I found that article very helpful.
The part I don't understand is how the glReadPixels
get's the winZ co-ordinate.
I mean I'm looking at a wireframe ellipsoid from an
odd angle - how does it know how to return the Z
co-ordinate of the surface of the ellisoid?
Surely I have to tell it where the surface is so that
it knows how to intercept the surface and not try to
pick a point into infinity (in front of and behind my
That is what is not explained anywhere I look.
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