Am 06.12.2012 22:16, schrieb James Holsenback:

> LOL ... starting with the simple scene it does not report finite until
> scale is set to 1000

 From the math, the threshold should be between 1357 and 1358 if the 
sphere is just transformed and/or rotated. (If a rotation is applied via 
an arbitrary matrix, the threshold might be as low as 783 to 784 in 
extreme cases.)

An infinite object is not excluded from bounding /per se/, but does not 
benefit from /hierarchical/ bounding.

(Fun fact: Spheres have such a simple math that they skip bounding box 
testing entirely, so they only benefit from hierarchical bounding at all.)

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