I simplified the problem, and the artifact occurs with this basic situation:

sphere
{
    0, 1
    hollow
    pigment {rgbt 1}
    interior
    {
        media {scattering {1, 1}}
        media {scattering {1, 1} density {function {0}}}
    }
}

Comment/uncomment the second null media, or add more null medias. When multiple
medias, POV adds each individual contribution. But in the presnet case, I
wonder what POV adds! The behaviour seems to be like x + 0 > x ...

This problem can become a major concern for my cloud system to implement my
"physically accurate" model.

    Bruno

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