Sereib wrote:

> is there any chance to tell POV-Ray that a light-source only has to be
> considered, if the distance between light-source and the point where a ray hits
> an object is not bigger than R?

I proposed such a feature about two years ago but it is not
included in 3.7 (see http://bugs.povray.org/task/118). If you
know how to compile your own version you can have a look at the
minor code change attached to the request.

Otherwise an alternative may be to use light_groups, although
this forces you to do disjoint groups (and is tedious, too).

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