> When shooting photons, if there is anything in the way, the photon is 
> not sent. Even if that something is perfectly transparent. With 
> pass_through, that object is ignored.

That seems to be the behavior, although I think the documentation
should be clearer on this point. The comparison to no_shadow is
misleading, as transparent objects (at least those with ior 1)
don't need that keyword to cast no shadow.

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