Clip-Mapping
Jeff Brickley (jbrickley++at++lmwsmr.lesc.lockheed.com)
Thu, 10 Apr 1997 17:28:11 -0700
As I understand it, Clipmapping is/was available with Performer 2.1 on
the IR level machines. What is the largest clipmap successfully used with
geometry (no 2 triangle scenes)? What was the polygon count? What was the
level of machine? We are finally getting started on clipmaps, but the
results are not looking good in so far as speed. Our normal Database
consists of two databases of 32,000 polygons in the same scene (side by
side) and our normal imagery was one 2048x2048x1 texture on one DB and one
4096x4096x1 texture on the other DB and we have always been able to maintain
20hz. This is without clipmapping, now clipmapping one DB in a scene (the
other removed) at 4096x4096x1, we've had to reduce the polygon count to
support it.... Is this normal for clipmapping? We are actually trying to
support the current Beta releases of Performer 2.2, but I have no comparison
to what has actually been accomplished with Performer 2.1....
Jeffry J. Brickley
Lockheed Martin
White Sands Missile Range
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