Perhaps the distance used in the calculation should not be taken from
the current ray only, but from the total distance travelled by the ray
sent from the camera (and bounced from reflecting objects or refracted
from transparent objects).
  Or would this be too hard?

  Perhaps better a falloff algorithm that doesn't depend on the ray length.

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

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