Shurakai wrote:
> Here the spline and the pic.
> #declare C_Path4 = spline { natural_spline
>    -0.25      <  -26.666, 0,  0>,
>     0.00,     <        0, 0, 20>,
>     0.25,     <       20, 0,  0>,
>     0.50,     <        0, 0,-20>,
>     0.75,     <      -20, 0,  0>,
>     1.00,     <        0, 0, 20>,
>     1.25,     <   26.666, 0,  0>};
>
> Maybe i'm totally wrong and a circle can't be declare by a spline

You'll never get a perfect circle as Thorsten points out, but if you use 
enough control points, you can get very close. Try this:

#declare C_Path4 = spline {
   natural_spline
   -0.25, <  -26.666, 0,  0>,
   #declare Points = 64; // 4 points is like it was before.
   #declare C = 0;
   #while (C<=Points)
      #declare V = C/Points;
      V, vrotate(20*z,360*y*V),
      #declare C = C+1;
   #end
    1.25, <   26.666, 0,  0>
};

Rune
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