"Sven Littkowski" <nomail@nomail> wrote:

> Yes, to some extend, I like what I see. :-)
>
> There are the ropes on the left side of the vertical cylinder, and those on the
> right side. All twist around the horizontal arm. The ropes of the one side
> (let's say left) are ABOVE the ropes of the right side.

So you just need to define a radius one rope diameter more for the second set in
order to arrange all the ropes the way you need them.

> Would you allow me to give you credit inside the scene file?
Sure thing - it's a lovely siege engine you've built.   :)

Let me know if you have any questions.

  #declare Ropes =
union {
#declare RopeR = 0.03;
#for (Y, 0, 2.5, 0.01)
 #local R = 0.25+RopeR;
 #switch (Y)
 #range (0.00, 0.95)
  #declare Theta = (Y/0.95)*pi;
  #declare X = R*sin(Theta+pi);
  #declare Z = R*cos(Theta+pi);
  sphere {<X, Y, Z> RopeR }
 #break
 #range (0.95, 1.35)
  #declare Theta = ((Y-0.95)/(1.35-0.95))*pi;
  #declare a = 0.2*0.2;
  //#declare X = 8*pow(a,3)/(pow(Y-1.15,2)+4*pow(a,2));
  #declare X = 0.1*sin (Theta);
  //#declare Z = -R;
  sphere {<X, Y, Z> RopeR }
 #break
 #range (1.35, 2.50)
  #declare Theta = ((Y-1.35)/(2.5-1.35))*pi;
  #declare X = R*sin(Theta+pi);
  #declare Z = R*cos(Theta);
  sphere {<X, Y, Z> RopeR }
 #break
 #end
#end
texture {Rope}
pigment {Green}
rotate y*25
}
#for (R, 0, 3)
 object {Ropes rotate y*R*10}
#end

    rotate < 0.0,180, 0.0 >
 }

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