From: Jürgen Gotschlich (juergen.gotschlich++at++dlr.de)
Date: 08/29/2002 05:31:37
Hi performer,
I need a hint, how to limit the color values of an application to a
specific threshold, e.g. to make sure that no pixels are drawn with
R,G,B-values above 0.9, if this is the threshold. So, all pixels with
color-values from 0.9-1.0 need to be limited to 0.9.
Here are some general thoughts:
Is it possible to do this with an overall function, independent of the
actual scenery ? How much does this affect the performance. Is it better
to reduce the limit-functions to specific objects ?
My application is using lots of DECALed textured objects. If I make
sure, that these textures only have limited pixel-values, then no
shading or lighting, etc. should change these values. Is that right ? So
this would be a 'pre-offline-check', nothing to do inside performer, but
a lot of work outside.
But what about the MODULATEd textures ? The color-values will change
according to the lighting model. I played around with basic gl-routines
like glBlendFunc, glBlendEquation, etc. but no result. May be I didn't
use them correctly.
Maybe there's another way via performer shader (chapter 10 in the Perf.
Prog. Guide) ? But I don't understand how to implement.
So, what is the best way ? Any hints are welcome.
Juergen
-- ________________________________________________________________________Jürgen Gotschlich email: juergen.gotschlich++at++dlr.de __/|_ Phone: +49(531)295-3248/2778 /_/_/_/ Fax : +49(531)295-2640 |/ DLR
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