Opal wrote:
> BTW: Is birefringence (and trirefringence) planned in future versions of
> POV-Ray? And isn't there any trick to achieve similar effect to birefringence?

Like Alain said, you can average two textures together. Each texture 
would have a slightly different surface normal, but this is a hack and 
will not be very accurate (to the eye, maybe...)

If you didn't know about this already, I'll tell you now of a useful 
include file containing different ior, dispersion and birefringence 
values for many different minerals:

http://www.seasoft.tecbox.com/Pov/NewIOR.html

The dispersion values are based on MegaPOV's implementation of said 
effect, but they should also work with the official versions.

I hope this helps!

Sam

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