'texture_map' comes to mind, but only for in POV-Ray 3.02 and earlier.  Can't be
done in version 3.1* far as I know.  If you're willing to go back to that
version then maybe you could get a reasonable placement of differing finishes
(refraction) using a pattern like onion or gradient or something.
The ability to mix 'interior' into a pattern doesn't seem to exist since the
'material_map' (which would have been the material pattern template) isn't a map
at all for 'material {}'.
Understand that?  Or not...?
Now if someone else defies what I just said I'd be more than happy to listen.

Bob

"Richard" <dai### [at] mindspringcom> wrote in message
news:3890E367.572DF8C2@mindspring.com...
| I was modeling a glass bottle I keep on my desk a few days ago and
| realized that there was one aspect of it that I have been unable to
| produce in POV:  the different densities of the glass.  Hopefully you
| will know what I am talking about.  The bottle that I have is not of
| consistent thickness, so the refraction is not uniform.  Short of
| modeling the thing out of blobs, does anyone know how to simulate the
| different densities of the glass?  Or possibly add a feaure that will
| add ior_map abilities or something like that -- kinda like a color map
| only with ior values if there isn't already a way to do this.  Thanks.
|

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