Warp wrote:

>   I made a minimal scene which reproduces the phenomenon.
> 
>   Comment out the box, and the caustic highlight appears. With the box there's
> no caustic. If the box has a transmit value smaller than 1, the caustic appears
> on the top surface of the box but doesn't go through.
> 
>   I'm not sure why this happens.

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.

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

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