On 20 Sep 1999 06:32:51 -0400, Nieminen Juha wrote:
>Ron Parker <par### [at] fwicom> wrote:
>: It's also
>: possible that POV automatically ignores objects that are entirely
>: further away than the closest intersection so far.  If it doesn't,
>: it should.
>
>  How can it know if the object is further or not without testing the
>ray-object intersection?

By taking the dot product of each of the six bounding box coordinates 
with the ray direction.  If they're all further away, then the object
must be.

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