I played with the number of points of a sphere_sweep:
had 9 points, reduce to 3, try to render - crash:

--

[...]

#declare raumt=1000;

sphere_sweep {
  b_spline
  3,
  <-150,70,0>,2,
  <0,0,0>,2,
  <150,70,0>,2


  pigment { color 0.5*Red }
  normal { gradient x }
  translate <0,80,raumt/2>
}

--



2. try: no crash
3. try: crash
and so on...

Even with wrong number of points this should not happen ;-)

system: W2K

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