Stephen <mca### [at] aolcom> wrote:
> 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
              here lack of inverse
>   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


.. this is what I rendered.

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