ghostch wrote:
> 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.
> 
> Does that mean there is no way that media interact with photons that have
> already passed through a lens or some other target?

No, it just means you can't use pass_through. See my other reply
in this thread for a modified example with caustics and media.

The tutorial may be a bit misleading when it states that you
need to specify pass_through for the media photons to work. In
that example it is required because photons enter the media
container prior to hitting the target.

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