"Eero Ahonen" <aero [at] removethiszbxtnetinvalid> schrieb im Newsbeitrag 
news:45083ed8@news.povray.org...
> Yet Another Empty Reflective Checkered Holy Sphere Over Double-Checkered
> Plane With Photons And Radiosity.
>

But there are no photons in your scene?
Looking at your source you are missing the object photons in the difference:
photons{ target 1.0 refraction on reflection on }.
And perhaps a interior statement with ior value to make the photons more 
interesting.

JSJ

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