Re: Performer intersection problem (maybe?)

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Jim Helman (jimh++at++surreal)
Wed, 03 May 95 22:11:52 -0700

> I talked this over with Scott. Since the slow down is in
> the app could the problem be in the Performer trig
> functions (tables) feeding bad data, e.g. wrapping around
> 360?

I'm not aware of pfSinCos generating bad data from valid
FP input. Unlike pfSqrt which does use a table, pfSinCos
has no table to fall of the end of.

It is true that applications should wrap angles which
continuously increase or decrease simply because of the
FP precision issues, i.e. 10 degrees out of 1.0e6. But
large values should cause quantization, i.e. jerkiness,
not bogus FP results.

rgds,

-jim helman

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

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