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Tim Cook wrote:
|   function{ sqrt(x*x+y*y)-r - (cos(atan(y/x)*ridges)*d) }
~                                          ^^^
	I'm guessing that at some camera angles you'll have a ray where POV
attempts to evaluate the function for x==0 which will produce the error.

	When using AA, you shoot more rays which increases the probability
that one will encounter the problem, but it should be possible to
find a camera position that will cause it too...

		Jerome
- --
******************************
*      Jerome M. Berger      *
* mailto:jbe### [at] ifrancecom *
*  http://jeberger.free.fr/  *
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