> I guess that if you were to create a tighter contained_by for each 
> "plane", then you might get that to run faster, but I suspect that the 
> gain would not be significant.

Well I *am* using a tight containing box, which in my case is like 30 
times smaller than the room.

I'd be interested in knowing the speed comparison between your method on 
a single isosurface, and using six isosurfaces with separate planes but 
*with tight containing boxes*.

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