Hershel Robinson wrote:

>> It seems that it would render faster without the manual bounding. If you
> do
>> not want that povray removes your bounding object, then use the '-UR'
>> switch. This will also remove the warnings.
> 
> You are correct--55 seconds with bounding and 41 without bounding, i.e. I
> removed the bounded_by statements myself.  Do you know why it's faster
> without them?
> 

POV-Ray does bound the object itself and often it does it quite well. Your 
bounding has not been good as you bounded every plane itself. The warning 
pov has given was because with that kind of CSG you were using the 
automatic bounding is generally better than manual bounding. This has not 
to be true in every case though.

- Micha

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