On 07/04/2015 17:28, And wrote:
> intersection{
>      sphere{
>      <0,0,0>,0.02
>      }
>      object{
>      Poly_Torus(0.01247, 0.02357)
>      inverse
>      }
> pigment{rgb<0.34,0.38,0.12>}
> }

I liked the shape and decided to animate it rotating.
http://youtu.be/frVgXyupZX8

I am not too sure about the shading. It is as if the normals flipped 
from one half to the other.
The material is a spiral1 pigment with a colour map.

To straighten the spiral I changed your code to:

intersection {
	torus {
		0.012470,0.023570
		sturm
		texture{ Spiral_Texture }
		rotate    <-90.0,0.0,0.0>
		}

	sphere {
		0.0, 0.020000
		}

	scale     <200.0,200.0,200.0>

		}


I'm not sure why putting the texture on the torus straightens it out.

-- 

Regards
     Stephen

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