Once again, cheers to POV-Ray TAG and supporting members.
  I myself was not able to figure how much effort should be needed to
implement the Double Refraction or birefringent material simulation.
Now, it seems to me that the simulation may well require team effort or some
sort of 2003(or 2004?) Siggraph presentation type effort.

I really appreciate your interest and suggestions.

Jong


"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3DB95D60.527123F6@gmx.de>,
>  Christoph Hormann <chr### [at] gmxde> wrote:
>
> > You will have to, there is no way achieving this from POV-Ray scripts.
>
> You could get something almost like it, with an average texture with two
> slightly different gradient normals. True simulation requires modifying
> the source code, though.
>
> --
> Christopher James Huff <cja### [at] earthlinknet>
> http://home.earthlink.net/~cjameshuff/
> POV-Ray TAG: chr### [at] tagpovrayorg
> http://tag.povray.org/

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