I have been trying to model a hollow glass sphere (cut in half via a clipped
plane)  Whenever I place the glass object over some steel stuff
(polished_chrome) the part under the glass becomes pretty dark compared to
the same stuff outside the glass.  I know that some light will be reduced
but is there any way to let the light come through 99% or so?  I can
increase the ambient level of the steel under the glass but then it starts
to look "plasticky."  I would like to retain the "reflectivity" of the glass
just allow enough light back through so I don't have to mess with the steel
ambient level.

Here is the object code:

#declare Dome =
difference {
   sphere { <0,0,0> 2.35}
   sphere { <0,0,0> 2.25}
   texture {pigment { rgbf <1,1,1,1>}}
   interior {ior 1.0 }
   finish{
      reflection 0.1
      diffuse 0.1
      specular 0.1
      phong 0.15
   }
   scale <1,1,0.25>
   clipped_by{plane{z,0}}
}

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