In the scene I'm currently playing with the camera is in a room with the
walls, floor and ceiling made of boxes in a union together.  If I don't
have a photons section in my global_settings no warnings are generated.
But when I do add the photons section POV-Ray reports, "Slab Building
Warning: Camera is inside a non-hollow object. Fog and participating media
may not work as expected."

What is the difference with photons or not?  Is there a way to prevent the
warning?  I don't plan on using media in this scene, but I'd still like to
know the cause.

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