: Povray told me, no csg with patches allowed.

  That's right.
  It's because povray can't determine whether a point is inside a patch or
not.

  Megapov can do it for triangle meshes. I wonder if it works for patches.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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