Bravo Mr. Prust!

     Now I can easily define my pointed vaulted ceilings as functions
instead of arcs.  I had been using chopped up cylinders before to carve them
out of a box, now I can use prisms and have real control.  This worked
smoothly first try with the same array and the vertex count reduced to one
fourth. Thank you!  Lonster

#declare myspline=spline{
  linear_spline
  #declare index=0;
  #while (index<100)
    index MyVectors[index]
    #declare index=index+1;
  #end
}

sphere_sweep {
  cubic_spline
  25,
  #declare index=0;
  #while (index<100)
    MyVectors[index],.2
    #declare index=index+4;
  #end
  pigment {color rgb <.8,.7,.9>}
}



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