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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.
Sigmund Kyrre Aas wrote:
>
> Not that it matters all that much..
>
> Why do I get a surface here:
>
> isosurface {
> function {sqr(x)+sqr(z)-sqr(y)}
> contained_by { box { -4,<4,0,4> } }
> pigment {rgb y}
> }
>
> but not here:
>
> isosurface {
> function {sqr(x)+sqr(z)-sqr(y)}
> contained_by { box { <4,0,4>,-4 } }
> pigment {rgb y}
> }
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