Re: pfBoxIsectFrust vs pfShereIsectFrust

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Jim Helman (jimh++at++surreal)
Wed, 02 Aug 95 18:34:16 -0700

> Does anybody knows which of pfBoxIsectFrust and pfSphereIsectFrust is the
> faster function and the performance ratio between them ?
   
The times depend on the exact geometric configuration,
since some rejections are quicker than others, but in
general, spheres are a fair amount quicker to test than
bounding boxes.

Also, a 2.0 note. As part of the C++ conversion, these
CAPI were changed since they are now member functions of
pfFrustum.

 pfFrustum::contains(pfSphere) -> pfFrustContainsSphere(frust, sphere)
 pfFrustum::contains(pfBox) -> pfFrustContainsBox(frust, box)

Note that the new API names reflects the fact that these
are really cull tests to see if "A contains B" rather than
symmetric tests of the intersection of two volumes "A and B".
We apologize for breaking API like this, but the 2.0 porting
scripts will take care of nettlesome name changes like these.

rgds,

-jim helman

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

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