Depth Buffer

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Paul Berridge (paulb++at++equipe.ltd.uk)
Thu, 25 Sep 1997 15:44:28 +0100

Can anyone tell me how to calculate depth from the value stored in the
depth buffer?

I guessed that it would be something like:

depth = nearClip*farClip/((1-dBuffVal)*farClip+dBuffVal*nearClip),

which gives depth values between the near and far clip ranges, but the
results aren't quite right.

Alternatively, is there a Performer function I can call to calculate it
for me?
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