Hi Mike,

thanks for the reply!

> Discs, Polygons and Triangles don't have an inside and outside, They are
> simply a surface, but they do have a normal. If you change the normal of
> the disc to z instead of -z, you'll get the "camera inside non-hollow
> object" warning. The "inside" of the disc is actually opposite the
> disk's normal.

I see... funny, adding the "hollow" keyword to the disc statement indeed
does help a little (in which case the normal direction doesn't make a
difference any more) -- yet the fog still looks inconsistent behind the
disc. Anyway, do you have a clue why a transparent disc should cast a
shadow?

Regards --

Torsten

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