"Francois Labreque" <fla### [at] videotronca> wrote in message
news:3A643F0A.F7E9F4A4@videotron.ca...

> > It should be noted that purists always use threshold 0 - the sphere
function
> > rewritten for threshold 0 would be (x^2, y^2, z^2) + 1
>
> Ahem.  x^2 + y^2 + z^2 - 1.
>

Oops... (and shouldn't that be "Eh")

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