clipka wrote:

>> Maybe that's a part for media, not pigment.
> 
> Birefringence is definitively neither a media nor pigment thing, but a 
> straightforward interior thing, and would have to join ranks with ior 
> and dispersion (as a matter of fact it's a difference in ior depending 
> on polarization with respect to the "optical axis" of the (AFAIK 
> necessarily) crystalline material).

How hard would it be to implement birefringence ...? Seems like it could 
easily be faked

Syntax would be trivial:

ior 1.5, 1.7 //(birefringent material)

You don't really need to care about the polarization of light, since 
light in POVRay doesn't have polarity anyway.

I would imagine tracing a second ray at a different IOR would be rather 
simple to add.

-- 
~Mike

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