Well, I think it's a bug anyway.

If the camera is inside an object that is marked no_image but is also a
media container, the media shows up in camera rays.  If the camera isn't
inside, the media doesn't show up.  We can't have it both ways.

I suspect that no_reflection is broken in the same way, but that could
be a lot harder to fix.

Also, and this one is even harder to fix without flushing performance down
the drain, media in a no_image container doesn't have any effect on reflected 
rays that started inside the container.

See the discussion entitled "Reflections?" or something similar in p.general
for a practical application of these various bugs.

-- 
#local R=rgb 99;#local P=R-R;#local F=pigment{gradient x}box{0,1pigment{gradient
y pigment_map{[.5F pigment_map{[.3R][.3F color_map{[.15red 99][.15P]}rotate z*45
translate x]}]#local H=pigment{gradient y color_map{[.5P][.5R]}scale 1/3}[.5F
pigment_map{[.3R][.3H][.7H][.7R]}]}}}camera{location.5-3*z}//only my opinions

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