> Ground fog is relative to a plane and the "up" vector is the normal of that
> plane. Anything below the fog_offset have a constent density, and that density
> diminishes according to that formula: 1/(1 + (y - Fog_Offset) / Fog_Alt) ^2 .
> Fog is not contained and don't interact with light (the main reason why it's
> faster).
> Translation don't affect fog. You can rotate the fog or the up vector.
>
> --
> Alain

Ok, thanks. I knew moreless all that you said. The thing I didnt knew was
the part of the interaccion with light and the way the fog was linked to
the plane.

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