Oleguer Vilella nous apporta ses lumieres en ce 2005-07-31 14:10:
> Hi Alain,
> 
> Yeah, you've used a box instead of a plane. Why?
> 
> Regards,
> Oleguer
> 
I tend to use a box when doing difference, I could use a plane{-z,0} and get the same
result. I 
could also have used an intersection with a plane{z,0} or a box extending the other
way as in my sample.

Alain

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