I simply forgot to type in the ior, it is 1.33.  I didn't copy the block
directly.
I'll try collect off.

apologies and thanks,
ADB

Richard Callwood III wrote:

> On Mon, 05 Jul 2004 11:35:34 -0600, Anthony D. Baye
> <ant### [at] sdsmtedu> wrote:
> >
> > I get odd results when rendering with photons, though.  It seems to
> > treat the transparent surfaces as though they were opaque (that is, the
> > surfaces are still transparent, but the light doesn't seem to get
> > through.  I get a solid shadow on the ground to the left instead of
> > having a lighter area for the dome, and a colored shadow for the
> > crystal.), and nothing I do fixes the problem.  If anyone has an Idea
> > about what I can do to fix this, I'd appreciate suggestions.
>
> Do you have photons { pass_through } on the dome and the crystal?
>
> Reactor recommended using an ior for the water.  In fact, i don't believe
> you'll get any results at all without an ior.  Fresnel reflection,
> refraction, and refractive caustics are dependent on the material's index
> of refraction, and POV-Ray will not calculate these effects without one.
>
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