Ron Parker wrote in message <36e9234a.0@news.povray.org>...
>On Fri, 12 Mar 1999 08:43:46 -0500, Greg M. Johnson <@aol.com> wrote:
>>Suggestions for additional topics include:
>>
>>1. Why raytracers cannot do caustics :
>>2. Why raytracers cannot make a "homemade" spotlight:
>
>These are, of course, both the same topic.  Clearly one would need
>to start with a definition of caustics.

Which is covered in the VFAQ I would guess, and:

Not entirely true anyway, as Nathan is showing us with his new patched
version of POV-Ray.
The statement "cannot do caustics" should be "usually, and with the current
technique - if they are not enhanced with photon-maps or something similar -
cannot do caustics" ;-)

Johannes.

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