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Hi all,
Yeah, you've used a torus to do it.
Sorry for the late reply, I was outside of Lleida.
Thanks,
Oleguer
news:42e2ca2c$1@news.povray.org...
>> But, should be a way to turn the cylinder like a half torus and I don't
> know
>> how can I do it.
>
> I'm not quite sure what you're asking if my reply didn't answer it.
>
> Let's say you had a cylinder, along the Y axis from <0,0,0> to <0,H,0>
> with
> radius R. You want to curl the cylinder by X degrees towards the x-axis.
> You
> could do it like this:
>
> #declare H = 2;
> #declare X = 90;
> #declare R = .2;
>
> intersection {
> torus {
> // we want X/360 * circumference of torus to equal H
> #declare MajorRad = H*360/(X*2*pi);
> MajorRad,
> // minor radius = cylinder's radius
> R
>
> }
>
> #if (X < 180)
> intersection {
> #else
> union {
> #end
> // cut off the bottom
> plane {
> -z,0
> }
> // cut off the other end
> plane {
> z,0
> rotate X*y
> }
> }
>
> translate MajorRad*x
> rotate -90*x
>
> pigment {rgb 1}
>
> rotate 90*x
> }
>
> It sounds like you want X = 180 if you want "half a torus." Watch what
> happens as you bring X from 0 to 90, 180 and even up to 360.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>
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