Warp <war### [at] tagpovrayorg> wrote:
> nemesis <nam### [at] nospamgmailcom> wrote:
> > http://img440.imageshack.us/img440/1255/lightcutstestzg0.jpg
>
>   The shadow under the head doesn't make physical sense. Where is it
> coming from? That shadow would indicate that there's a strong light
> source above the head, but the illumination of the head does not correspond
> to this. The bright area on the floor would rather obviously not cause
> such a shadow.

You're forgetting about all the indirect scattered light.

With the head so close to the surface, it is blocking the indirect light from
almost all directions except sideways, so it gets significantly less light
(plus, light of same intensity from sideways is actually weaker at illuminating
a surface).

The indirect lighting in this picture seems quite exaggerated to me, but apart
from that there's nothing wrong with this.

Radiosity will produce a shadow there as well. Or at least it should - if it
doesn't it's off reality.

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