Wasn't it Carl Hoff who wrote:

>I find that a little surprising as the scaled sphere is a much better fit.
>If the sphere test is slower then a box test then I'm curious when
>using a sphere as a bounding object would actually give an
>improvement.  Could it be the scaling that's slowing it down?

I don't think that scaling ever slows down any ray tests. What happens
is that all the scaling, rotations and translations for an object are
combined during parsing into a single transformation matrix. Applying
the resulting matrix goes at the same speed whatever type of
transformation is being applied.

-- 
Mike Williams
Gentleman of Leisure

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