> in your opinion, why both sides of the cube are so darker than the top
> face ?
>
> one plane, one sky_sphere and the cube.
> no light.
> use of standard "Radiosity_Final" parameter.
> all object are white
> ambient is set to zero in de default settings

The light is coming from the sky sphere, and you have blocked the lower half of
that sphere with your plane.  Therefore, the sides are only exposed to roughly
half of the amount of light that the top gets.

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