Hi Slime,

> That's because you're using transparent fog, and the transparency is
> calculated for each ray (once before the disc, once after it). Use "color
> rgb 0.5" instead of just "color 0.5", which is equivalent to "color rgbft
> 0.5" and probably not what you want. Then the disc looks correct.

stupid me! Of course I didn't want to imply rgbft...

> As for the shadow, I have no idea. Increasing the fog distance makes it fade
> away, so it's related to the fog, but fog isn't supposed to cast a shadow.
> Maybe the shadow ray is actually seeing the fog between the plane and the
> disc and that's what's causing the shadow.

Specifying "no_shadow" for the disc makes the shadow go away!

Thanks to all of you for your comments --

Torsten

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