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"gvdeynde" <gvd### [at] hotmail com> wrote:
> Hi,
>
> Scene: one spotlight, one coloured glass ball (photon target on for
> reflection and refraction, collect off), white plane below ball; setting up
> photons only using spacing and autostop. Povray 3.6.1 for windows.
>
> Without photons enabled: a coloured shadow from the glass ball
> With photons: some caustics, but the coloured shadow has become grey.
>
> Is this normal behaviour? Why would the colour disappear?
>
> bye,
> gert
You didn't mention if you were using an interior with ior (index of
refraction) with the ball. If you are, try adding some dispersion. You'll
get colors!
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