Reading absolute values from the depth buffer.

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Øyvind Roa (oyvind.roa++at++ks-t.no)
Thu, 10 Dec 1998 17:14:22 +0100

Hello,

Does anyone know how I can read absolute values from the
depth buffer ? I have tried using glReadPixels(), however it
seems that this function always normalize the output.
What I actually want to achieve, is to find out how far from
the eye point is the most distant feature (or just one of it's
rendered pixels) seen in a given frustum.

Thanks for any suggestions,
Oyvind

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Oyvind Roa
Senior Software Engineer

Kongsberg Defence & Aerospace A/S, Simulation & Training
Box 1003, N-3601 Kongsberg
NORWAY

E-mail : oyvind.roa++at++kongsberg.com
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