Example usage:

#declare Sd = seed(0);
#declare N = 250;
#declare Points = array[N];
#for (I, 0, N-1)
 #declare Points[I] = <rand(Sd)*20-10, 0, rand(Sd)*20-10>;
#end

#declare Cells = array[1];
VoronoiCells(Points, Cells)

#for (I, 0, N-1)
 #declare NC = dimension_size(Cells[I], 1);
 #if (NC > 2)
  prism {
   0, rand(Sd)*4 + 1,
   NC+1,
   #for (J, 0, NC-1)
    <Cells[I][J].x, Cells[I][J].z>,
   #end
   <Cells[I][0].x, Cells[I][0].z>
   pigment { rgb <rand(Sd)*0.5+0.5, rand(Sd)*0.5+0.5, rand(Sd)*0.5+0.5> }
   finish { ambient 0 }
  }
 #end
#end

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