hello everybody

i've got a little syntaxical problem, I would like to define a polygon whose
points comes from a spline that I'm covering.

I would like to do something like that :

#declare MySpline =
  spline {
    natural_spline
    0,  <0,1,0>
    .5, <.5,.6,0>
    1,  <1,1,0>
  }

#declare i=0;
polygon{10,
  #while (i<10)
     MySpline(i)
     #declare i=i+1;
  #end
pigment{Red}
}

but of course, it doesn't work, it brings a parse error. How should I do ?
Thanks for your help.

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