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int samples = 50;

int prim = addprim(0, "polyline");
float length = 20;
length *=fit01(rand(@ptnum), 0.5, 1);

for(int i=0; i<samples; ++i)
{
  
  float step = i/float(samples);
  vector p = @P + normalize(v@v)*step*length;
  int pt = addpoint(0, p);
  addvertex(0, prim, pt);
}
removepoint(0, @ptnum);