Dear Christoph,

 I really appreciate your support.  I am relieved to know that it might be
possible when using non-polarized light source.

What I would like to do is that the raytracing( if possible photon-mapping
included) of some (several to 20) cylindrical almost-transparent objects
parallel each other, or perpendicular, on a some simple plane like a
blackboard with the non-polarized light source.

My question then is this(level of difficulty):
Do I have to write a macro or function in this case(I might have to learn
quite a lot, a month or two, though)?
 Or do I have to 'code' some source of the POV(well, I don't think I have
the ability to do so).

Thank you again,

Jong

"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3DB8FD33.E1289495@gmx.de...
>
>
> Jong wrote:
> >
> > When a calcite crystal is laid on a page of newspaper, the characters
would
> > form double images. The refractive indices of the clacite crystal are
1.6584
> > and 1.4864(n0 and ne, respectively)["Optics",p.337, Hecht]
> > Would it be possible with some effort to simulate this phenomena for
> > birefringent materials in the POV-ray 3.5?
>
> That depends on the level of realism you want.  Birefringence is an effect
> related to the polarization of light and a complete support for all
> important effects related to polarization would require quite elementary
> changes to POV-Ray.
>
> If you however only want the optical effect of birefringent materials on
> unpolarized light you could probably achieve this by a not that
> complicated modification of the refraction code.  You would however
> somehow have to define the orientation of the crystal, probably as a new
> interior property.
>
> > Are there any such programs to support this function other than POV?
>
> Not that i know of.
>
> Christoph
>
> --
> POV-Ray tutorials, IsoWood include,
> TransSkin and more: http://www.tu-bs.de/~y0013390/
> Last updated 13 Aug. 2002 _____./\/^>_*_<^\/\.______

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