Nathan Kopp wrote in message <36E7016F.72E68084@Kopp.com>...
>
>what strange effect?
>

The rim of the shadow gets darker, but beyond that there is a thin brighter
"halo". Perhaps this is caused by total internal reflection or something?
Reflective caustics were turned off in the test.

>
>If it's too sharp, try a larger gather radius.  I've done all sorts of
>tests with the brightness, so it _should_ be correct.
>


I haven't looked, but I'm pretty sure I don't have a sphere with an ior of
1.1 around the house :)
So I can't test my claim. I said it _seems_ strange, but it's impossible to
visualise refractive caustics in one's mind, so maybe it's correct.
Changing the gather radius doesn't change it, btw.

Margus

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