A few days ago I reported experiencing problems with flickering of specular
reflections on recent nVidia cards, such as the nVidia FX 5200 found on my
G5 iMac. I've now boiled it down to a simple test case and submitted a bug
# 4070967, which includes source code for reproducing the problem. It seems
related to a problem with directional lighting:
For example, if the w argument to glLightfv(GL_LIGHT1,GL_POSITION,...) is
exactly zero, which should disable attenuation as per the red book, then
flickering occurs (basically, specular reflections are not always drawn
before the buffer is swapped, even though the triangles themselves are
themselves completely drawn). However, if w is set to a small non-zero
number, then no flickering is observed.
Any ideas?
Cheers,
Warren
--
Warren L. DeLano, Ph.D.
Principal Scientist
. DeLano Scientific LLC
. 400 Oyster Point Blvd., Suite 213
. South San Francisco, CA 94080
. Biz:(650)-872-0942 Tech:(650)-872-0834
. Fax:(650)-872-0273 Cell:(650)-346-1154
. mailto:email@hidden
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