Have you tested this? I once mailed Larry Gritz (the author) about this and
he said that refracted caustics are possible (but very expensive and do not
always give good results).
Quite frankly, I haven't tested it myself, since until very recently I had a
486 and caustics took forever.

Margus

Mike wrote in message <36B3A73E.52976134@aol.com>...
>BMRT handles reflective caustics reasonably well.  It doesn't do
>refractive caustics at all.
>
>-Mike
>

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