> Alain<aze### [at] qwertyorg>  wrote:
>> You can also do an approximation by stacking many very thin normal
>> prisms, each slightly rotated relative to the one under it.
>
>    Wouldn't a box be more efficient?
>

It would for a rectangular section. If the section is not rectangular, 
or you have more sides, then using stacked boxes won't do.


Alain

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