Christian Froeschlin <chr### [at] chrfrde> wrote:
> According to the documentation, pass_through does not have
> an effect on photons which have already hit their target. You
> probably need to specify "refraction on" to get it to work.

  If you do that, the caustics change drastically. The box is not "invisible"
to the photons.

> Apart from that, I don't think I would expect photons to affect
> media if the container object is tagged with pass_through ;)

  You might not expect it, but that doesn't mean you are right.

http://wiki.povray.org/content/Documentation:Tutorial_Section_3.7#Media_and_photons

-- 
                                                          - Warp

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