> Just wondering why we cannot state in the definition of a torus it's
> "centre" as we do for a sphere?
>
> Is this because the torus does not have a centre as such, but it does have
> an origin.

The major building parts for a torus are just the major and minor radius. A
box, for example, also has an origin, but you still just position the two
corners. I guess for the sphere, the center position just can easily be
integrated into the solving process, whereas for a torus it would be a
matrix-transformation anway, but that's just an educated guess and may be
incorrect.

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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