Hi Mike,

No, I haven't thought it.

I did it using your suggestion, but I don't need the seed and the rand 
rotation because I just want a line folliwing the inner contour of the 
object.

So a torus with the radios equal to the radius sphere and applying the 
transformations, rotations and scale properly to fit it right.

Thanks for your answer.

Best regards,
Oleguer




news:HXHSqAAbGg+CFw### [at] econymdemoncouk...
> Wasn't it Oleguer Vilella who wrote:
>>Hi all,
>>
>>First I'm going to put a small part of code:
>>======================================
>>merge{
>>sphere { <0, 0, 0>, 1
>>translate -0.5*x
>>scale <1.2, 0, 0>
>>}
>>sphere { <0, 0, 0>, 0.5
>>translate 0.7*x
>>scale <1.4, 0, 0>
>>}
>>======================================
>>After that I've the transformations, the colors and I've clipped_by with a
>>plane { z, 0} and it's empty using hollow.
>>
>>Now I want to put a thread following the inside part of the two spheres. 
>>The
>>only way is creating a spline and using it like a function?
>
> Have you considered using torus sections?
>
> If you create a torus so that R1+R2 is equal to the radius of the
> sphere, apply any required rotations, translate and scale exactly like
> the spherical part that it's following, then difference the other sphere
> and plane. Like this
>
>
>
> global_settings {assumed_gamma 1.0}
> camera {location  <5,0,4> look_at <0.3,0,0> angle 25}
> background {rgb 1}
> light_source {<-30, -30, 30> color rgb 1}
> light_source {<0, 0, 30> color rgb 1}
>
> // Main shape
> merge{
>  sphere { <0, 0, 0>, 1
>   translate -0.5*x
>   scale <1.2, 1, 1>
>  }
>  sphere { <0, 0, 0>, 0.5
>   translate 0.7*x
>   scale <1.4, 1, 1>
>  }
> clipped_by {plane { z, 0}}
> pigment {rgb x}
> }
>
> // Threads in the large part
> #declare N=0;
> #declare S=seed(123);
> difference {
>  union {
>    #while (N<20)
>      torus {0.98,0.02
>        rotate <rand(S),rand(S),rand(S)>*360
>      }
>      #declare N=N+1;
>    #end
>    translate -0.5*x
>    scale <1.2, 1, 1>
>  }
>  sphere { <0, 0, 0>, 0.5
>   translate 0.7*x
>   scale <1.4, 1, 1>
>  }
>  plane {z,0 inverse}
>  pigment {rgb 1}
> }
>
> // Threads in the small part
> #declare N=0;
> difference {
>  union {
>    #while (N<10)
>      torus {0.48,0.02
>        rotate <rand(S),rand(S),rand(S)>*360
>      }
>      #declare N=N+1;
>    #end
>    translate 0.7*x
>    scale <1.4, 1, 1>
>  }
>  sphere { <0, 0, 0>, 1
>   translate -0.5*x
>   scale <1.2, 1, 1>
>  }
>  plane {z,0 inverse}
>  pigment {rgb 1}
> }
>
>
> -- 
> Mike Williams
> Gentleman of Leisure

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