Problem with model flickering in Performer 2.0
Gary E Williams (gewillia++at++afit.af.mil)
Fri, 20 Sep 1996 14:53:42 -0400
I recently ported a virtual solar system modeler from Performer 1.2 to 2.0.
I'm now having problems with flickering in many of my models. By flickering,
I mean models which have texture maps and models which don't have texture maps
have periodic changes of color. For example, Africa and other parts of the
earth flicker between the approriate land colors and blue (the ocean). That
model uses a texture map. With another model, a satellite, the colors flicker
between what they're supposed to be and other colors. The satellite doesn't
use texture maps. I've also checked for coplanar polygons, averaged vertices,
etc. Coryphaeus has attempted to help me, but the problem seems to be
Performer related, not a model problem. This conclusion is substantiated by
the fact that I didn't have these problems in Performer 1.2. The problem is
magnified as the viewing distance to the model is increased, i.e. up close the
flickering isn't too bad or is nonexistent but it gets worse as you move away
from the model. Some of the models use LOD and some don't. This doesn't seem
to have any impact on the problem.
Input from anyone experiencing this type of problem or from anyone who knows of
a solution would be greatly appreciated. Does this sound like a Z-Buffer
problem?
I'm running on an Onyx RE^2 under IRIX 6.2. Thanks.
Gary
--
*************************************************************
GARY E. WILLIAMS, Capt, USAF
MS Student: Modeling & Simulation
Air Force Institute of Techonology (AFIT)
gewillia++at++afit.af.mil
http://www.afit.af.mil/ENGgraphics/people/gewillia/index.html
=======================================================================
List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
Submissions: info-performer++at++sgi.com
Admin. requests: info-performer-request++at++sgi.com
This archive was generated by hypermail 2.0b2
on Mon Aug 10 1998 - 17:53:35 PDT