This is one way.  I just messed around to get it right for this example of it,
and it does use only sin for the waviness.

light_source { <0,1,-10> color rgb <1.5,1.5,1.5>}
camera {
  location  <0,0,-5>
  angle 30
  look_at   <0,0,0>
}

background {rgb .5}

#declare Curve=.25; // amount of curvature [higher is larger]

#declare C=360;
#declare c=0;

#while (C>0)

#declare c=c+(1/360);

// blob { threshold .1 // slower
sphere {0,.1 // ,1 // for blob
        translate -1*z rotate C*y
        translate (sin(c * 4 * pi)*Curve)*y
   pigment {rgb <c,1-c,.5+c/2>}
  }
//  pigment {rgb 1} // for blob
// } // for blob

#declare C=C-1;

#end


Bob

"Eitan Tal" <eit### [at] netvisionnetil> wrote in message
news:38B6F838.6F69F2E9@netvision.net.il...
| Hi! I wanted to know how to make somehting like a torus, but instead of
| being O, I need ~
| I will also like to know how they made these beautifull jewlery at the
| documentation...
|
| Did they use Sin?
|

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