If any of the light sources in the scene has
photons { reflection off refraction off }
no photons are shot, no matter how many other light sources are there in
the scene.

  And a question:
  I'm trying to get a visible reflected light beam. I thought that making
the photons to interact with the scattering media would do it. However it
doesn't work. The light beam starting from the spotlight is visible, but
none of the reflected beams is. Is it supposed to? Perhaps I'm doing something
wrong?

-- 
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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