>>Speaking of bounding, I've heard that POV's bounding isn't always as 
>>efficient as it could be. Would it be worth my while to manually bound 
>>every object in my scene, or would it be too much trouble for minimal gain?
> 
> 
>   It depends on the object.
>   Certain objects are difficult to bound automatically, although most of
> them can be done so.
> 
>   If I'm not completely mistaken, min_extent() and max_extent() return
> the coordinates of the bounding box of the object. You can use them
> to visualize where the bounding box really is.

Not forgetting the [easier to turn on but somewhat less useful] "show 
bounds" option...

Typically, POV seems to make a pretty good job of things. I have a habit 
of making polyhedrons out of infinite planes - this is a somewhat 
pathelogical case. If you were to (say) take the intersection of two 
huge spheres that only just touch (creating a "lense" shape), that might 
be slightly sub-optimal. (But not as bad as you might think...)

Andrew.

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