A test in a radiosity scene.. Max_trace_level 2 is used (i was hoping to
avoid unwanted translucent effects with this trick)

the material for the box is :

hollow double_illuminate
pigment  { color rgbt<1,1,1,0.75> }
finish { diffuse 1 ambient 0 }
interior  {
    media
    {
      #declare Diffuse=1.5;
      scattering {1, rgb <.83,.79,.75>*Diffuse extinction 1/(Diffuse) }
      intervals 1
      samples 15
      method 3
    }
  }

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