I made a spectral dispersion include based upon Daren Wilsons example for P-R 
3.0*.
It's at http://members.aol.com/inversez/index.html in the Includes section.
I made simulated true wavelengths (by simulated here I mean they are somewhat 
relative among themselves according to actual wavelength in nature).
Choice of 6 or 12 wavelengths to use, with 12 being most realistic and 6 being 
fastest. I even added a fake infrared and ultraviolet possible so to blend at 
the ends. Not science in the least but it can look pretty convincing if 
variables are set up right. Btw, this only handles objects pigments as seen 
through the transparent texture, not light source colors; as many well know, 
lights do not have transmittance, as in reality. Only specular highlight, 
caustics and shadow.
I tried this out in POV-Ray 3.1 and didn't have any luck, but I did manage to 
use ior in the finish statement without an interior statement elsewhere with 
no problem. Seems use of any pattern is "lost".

Message <3625B487.C30E8482@peak.edu.ee>, Margus Ramst  typed...
>But about your question: as far as I see, varying ior is no longer possible
>in 3.1. However, if U really need this, I saw a tutorial (_not_  a patch)
>about adding dispersion to POV (I assume this is what U mean by
>rainbow-refraction). It is at Daren Scot Wilson's page:
>http://www.newcolor.com/darenw/DarenHome.html
>Haven't tried this myself and U need to hack the source to do it, but
>judging from the images it gives nice results.
>
>Hope this helps...
>
>Margus
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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