On Sun, 6 Jun 2004 09:35:47 +0100, "Ray Bellis"
<use### [at] raybellismeuk> wrote:

>You've missed my point - there is *no* media in the test scene file!

Opps! Sorry.

The problem is max_trace_level it needs to be set > 6 in your scene.
global_settings {
  assumed_gamma 1.0

  max_trace_level 7
}

Remember for media "hollow" is a keyword, not a difference. So maybe

/* a hollow glass sphere */
difference {
  sphere { 0.0, 1 }
  sphere { 0.0, 0.97 }   
  texture { T_Glass1 }
  interior { I_Glass }  
  hollow
}

/* why can I see this sphere?  */
sphere {
  0.0, 0.5
  pigment { rgbt 1 }     
  hollow  
}

as well. As your scene increases in complexity max_trace_level may
need to increase too.

Regards
        Stephen

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