That's why I was whining.
  AFAIK currently the only place where we can see that normals do not affect
the radiosity by default and that it has to be turned on in the radiosity{}
block with "normal on" is in the complete history page:


December 9, 1999 - WinMegaPov

...

  10. by default, radiosity will not use perturbed sufrace normals.  Add
      'normals on' to the radiosity{} block in global_settings to enable
      this feature.  This feature also now is now significantly faster and
      better than before.

  And as I said, the correct syntax seems to be 'normal on'.


  Ps: My whining was only related to the documentation. The feature itself
is great.

-- 
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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