Thomas de Groot <tho### [at] degrootorg> wrote:


>
> I shall make a second /final/ render tomorrow with better visible caustics.
>
> Thomas

Look:
http://www.povray.org/documentation/3.7.0/t2_3.html#t2_3_7_7

If the object doesn't radiate photons (walls), the line photons { }, in
material, is absent

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