Am 21.11.2011 06:27, schrieb George White:
> I have overlapping blue and yellow transparent "gels". With one blue and the
> other yellow I was expecting the overlapped region, when back-lit, to look green
> from the front. Instead it is brownish color. I seem to have a reason to use
> POV-Ray once every two years or so for the last 6 years but have not used media
> or photons before. I made a simplified file that illustrates my scene issue.
>
> I'd appreciate any help in getting two transparent colored gels to work. thanks

Is that your complete scene? Because when I render it I don't see 
anything brownish where the two gels overlap.


Try giving the blue gel a slightly green-ish hue, say rgbf <0,0.2,1,.9>, 
otherwise the combination of the two filters will let no light through 
at all (<0,0,1>*<1,1,0> = <0,0,0>).

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