"Anthony D. Baye" <Sha### [at] spamnomorehotmailcom> wrote:
> I'm trying to create a special effect for a model I'm working on.  The material
> would be a semi-transparent white stone (with falloff) with micro-crystalline
> inclusions that shift color with the angle and perhaps form geometric patterns.

I have a pretty good mental picture of what you're trying to create; I think
I've seen a mineral sample of a similar kind at one of the Smithsonian museums
in Washington, D.C.

The only suggestion I can think of is to check out the irid keyword at "3.5.3.6
Iridescence" in the docs, along with irid_wavelength in global_settings. That
*might* produce the shifting color effect you mention, if applied to a
crystal-like surface.

Ken W.

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