Re: information on pfSegsIsectNode

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Jim Helman (jimh++at++surreal)
Fri, 01 Jul 94 09:21:30 -0700

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pfSegsIsectNode and pfChanPick both perform intersection testing on
the host CPU by traversing the scene graph and using its hierarchical
bounding volumes. On an MP machine, it can be done in the APP or
ISECT process. The latter allows for intersection testing to be
asynchronous and run at a slower rate than the application itself, so
as not to limit frame rate. When performed as part of the APP (or a
combined APPCULLDRAW on a 1P machine like an Indigo2), intersection
testing is best done after pfFrame() but before pfSync() so that it
can overlap with other processing either on another host CPU or in
the graphics hardware.

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/390-1151

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