Re: cliptextures with depth shadows

Angus Dorbie (dorbie++at++sgi.com)
Tue, 10 Aug 1999 13:21:28 -0700

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There is no obvious reason this should be happening. One prime suspect
could be the texgen but an alternative could be if the texture state id
were going awry (I've seen this with LOD callbacks in the CULL process)
then the texel values _might_ be bogus. So make sure the LOD callbacks
are not in the CULL process or be paranoid about state management if
they are, the clipfly code we shipped had a bug with LOD callabcks in
the CULL process corrupting texture state.

How are you doing the projection?

Is it custom code? I have sample code for this + explanations in the UAV
section of www.dorbie.com. This uses CLIP texture but only on the ground
with a projected sensor shadow.

Cheers,Angus.

-- 
"One of the best-known folk theorems of software engineering is that
60% to 75% of conventional software projects are either never
completed or rejected by their intended users. If that range is
anywhere near true (and I've never met a manager of any experience
who disputes it) then more projects than not are being aimed at goals
which are either (a) not realistically attainable, or (b) just plain
wrong."
                 Eric S. Raymond - The Cathedral and The Bazaar

For advanced 3D graphics Performer + OpenGL based examples and tutors:
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• Next message: Jorge Valencia Loera: "wrong lighting when shadows are ON"
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