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

simplify

y = sqrt(2a(b-z)) + a + b - z - x

Now that should be the right equation...  Don't quote me or anything.

--
_____________________________________
Justin Rogers, CEO DigiTec Web Consultants
Personal Programmer and Web Consultant
Email:  dig### [at] 3nnet
Thomas Jespersen wrote in message <357### [at] daimiaaudk>...
>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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