does this work for you?

camera {
  location <-5,15,-10>
  look_at 0
  angle 45
}
light_source {
  <-5,15,-10>
  rgb 1
}

#local a = 5; //semimajor axis
#local b = 3; //semiminor axis
#local r = .5; //minor radius

#local n = 20;//number of spheres/accuracy of object

sphere_sweep {
  cubic_spline
  n+3,
  #local i=0;
  #while(i<=2*pi*(1+2/n))
    <a*sin(i),0,b*cos(i)>, r
    #local i=i+(2*pi/n);
  #end
  pigment { rgb y }
  finish { phong 1 }
}

Regards Roman

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