"Mr. Art" wrote:
> 
> It is just an old convention for describing a box (box{max,min}).
> And it seems to have been with us forever. But lets give this
> description a try: box { <4,0,4>,-4 }= a box that has
> no size in this universe (max. is less then min) but might have
> some volume in a non-POVian universe.

You probably meant box{ -4,<4,0,4> }. Similar to spheres with negative radius I
guess. Strange then that both regular boxes and clipped_by boxes work fine.

sig.

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