Am 11.12.2011 00:13, schrieb Alain:

>> Another unofficial patch: Different sky sphere pigments for background,
>> reflection/refrction, and radiosity (here: blue, red and green,
>> respectively, with one reflective and one refractive sphere on a
>> black-and-white checkered plane).
>
> Stop teasing us. We want RC4 NOW!

Heh heh :-P

You should indeed not hold your breath for this patch. It's still quite 
experimental, and chances are it won't make it into 3.7.0 at all.

> Not for every scene, but opens some interesting avenues. One
> applications I can see: High resolution HDR on a sky_sphere that is
> normaly visible, and a low resolution, blured HDR used for radiosity.
> Should work good when you have some small and very bright areas.

Yup.

Or to avoid double illumination from both radiosity and conventional 
lighting in case you've set up a light dome to match the sky sphere. 
(You would specify "pigment { color rgb 0 }" in that case for the 
radiosity sky sphere.)

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