> Yes, I guessed it should be possible. Is there anything I can do to 'fix'
> this problem except for adding the no_radiosity keyword?

Render it as a 2 frame animation and use save_file to save the
radiosity data witout the glass, then load the data back in and
do a final frame with the glass.

global_settings {
  assumed_gamma 1.0
  max_trace_level 10
#switch (frame_number)
#case (1)
   radiosity {
      save_file "bidirectional.dat"
   }
   }
#break
#case (2)
   radiosity {
      load_file "bidirectional.dat"
   }
   }
   object {globe}
#break
#end

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