IMBJR wrote:
> 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.

I guess it is only because of it has been allways that way. I see no 
clever reason why there is not/should be the center parameter. It also 
_might_ have to do with the fact that the orientation of a torus is 
predefined. If one wanted to rotate torus, it allways has to be first in 
the origin.

Severi

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