Bob Hughes wrote:

> This may be too obvious, so guessing this has not been overlooked.
> You're using a multi-colored background (or multi-gray shades) aren't
> you? You at least need a gradient or 2-tone object or sky showing in the
> refracted part of the object so the colors may divide. At least this is
> the way the non-patch way works.

   The problem was manifesting itself with very high ior values. Reducing the ior
brought out the function but concerns me. I was trying to use the dispersion with
the scene file Brilliant (fron the images group post) which has ior values up to 2.4.
The diffusion dissapears and the render time goes out the roof. Under the official
release the render time is acceptable but the gem quality suffers. It seems, to me
anyway that the material properties of the new patch are better than the official
build
(more realistic), but I am not achieving the advertized response from the patch.
I was finaly, after reducing the ior, able to get a simple orb to render with colored
dispersion but the high ior values are not working in complex shapes.

A curious state of affairs that I will continue to investigate until my patient nature
gives out.
I'm still not convinced that it is not something that I'm doing wrong with the
settings so

for now I will not cry foul.

--
Ken Tyler

tyl### [at] pacbellnet

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