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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