Objects inside media receive too much light when the scene is inside a 
sphere. This happens in 3.7.beta.17 pvengine.exe and also in POV-Ray 
3.6.1 Windows and UNIX versions.

Picture: http://tinyurl.com/y4zsc9

// This
// sphere{0,100 hollow}

// and this makes the cylinder appear too bright inside media.
// sphere{0,100}

global_settings{
   assumed_gamma 1
   max_trace_level 10
   radiosity{error_bound 0.8 media on}
}

camera{
   location<-6,6,-6>
   direction 2*z
   look_at<0,0,0>
}

light_source{<10,10,-10> rgb 1}

box{<-2,-2,-1>,<2,2,1> hollow
   material{
     texture{pigment{rgbt<0,0,0,1>}}
     interior{media{scattering{1,0.1}}}
   }
}

cylinder{-2*z,2*z,1 pigment{rgb 1} finish{ambient 0}}

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