Lars Luthman wrote:
> 
> Hi!
> 
> I'm just wondering if anyone has the equation for a torus? I've seen it in
> the doc file, but I would like to have it in this form: "y = ..."

Here it is:

(x^2 + y^2 + z^2 - (a^2 + b^2))^2 = 4a^2(b^2 - z^2)

This torus is revolved around the z-axis. a is the radius of the torus
and b is the radius of the circle revolving around the torus (sorry, I
am not english, hope you understood!)

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