Gouraud shading bug(?) on 4D20G under 3.3.2

[Jim Bennett]

In article <1991Apr17.205152.21270 at sun1.ruf.uni-freiburg.de> ra at sun1.ruf.uni-freiburg.de (Christoph Ramshorn) writes:
>
>
>	We recently upgraded to 3.3.2 on our 4D20G and have a problem with
>Gouraud shading since: some triangles are rendered in green or magenta hues
>regardless of their actual color; the edges of those triangle edges are colored
>correctly, though.  Which triangles show those wrong colors depends on light
>source position (infinitely distant lights used), but the effect does not seem
>to follow any rule. This bug(?) is also observable the "flip (martini, x29,
>etc.)" demos.

I tried running flip on a similar configuration (my machine was a GR1.2,
a later rev of the graphics board), and I didn't see any problem.  I
haven't received any bug reports like this from the field.

Is any one else out there experiencing a problem like this?

>Christoph Ramshorn, Geologisches Institut, Albertstr.23-B
>D-7800 Freiburg i.Br., West Germany
>ra at trias.geologie.uni-freiburg.de
>Phone +49 761 203 2408  Fax +49 761 203 2463

Jim Bennett				(bennett at sgi.com)