>> My current work is on dividing space into lots of cubes, and figuring 
>> out which of those cubes actually contain some surface. It seems if I 
>> tell POV-Ray to render only those cubes, I get *massive* render 
>> speedups...
> 
> 
> Well - you have just reinvented bounding trees...
> 
> http://www.tu-bs.de/%7Ey0013390/fast_iso/patch.html

...and where did you think I got the idea from? ;-)

Question: if it works so well, how come POV-Ray doesn't do this by 
default anyway?

Andrew @ home.

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