It seems to be 'normal on' instead of 'normals on' (discovered by
trial-and-error method).
  It now is reasonably fast (2 minutes and 40 seconds with 'normal on' and
1 minute 19 seconds without). Good job.

  It seems to work better now, but why does the "fake" gap look so different
from the real gap? It doesn't look wrong, just different.
  Here is (again) the test scene:

global_settings
{
  #if(version=3.1)
    ambient_light 4
    radiosity
    { count 300
      nearest_count 5
      error_bound .2
      recursion_limit 2
      low_error_factor .5
      gray_threshold 0
      minimum_reuse .015
      brightness 8
      distance_maximum .1
    }
  #else
    ambient_light 0
    ini_option "Preview_Start_Size=8"
    ini_option "Preview_End_Size=4"
    radiosity
    { count 120
      nearest_count 5
      error_bound 1
      recursion_limit 4
      low_error_factor .5
      gray_threshold 0.0
      minimum_reuse 0.015
      brightness 2.8
      max_sample 2
      adc_bailout 0.01/2
      normal on
    }
  #end
}

camera { location <-1.99,0,-1.99> look_at z*2 angle 40 }
light_source
{ <-1.99,.99,-1.99>, 1
  spotlight point_at <0,-1,2> radius 15 falloff 15
}

difference
{ box { <-2,-1,-2><2,1,2> inverse }
  box
  { <-.1,-.9999,-.1><.1,.9999,.1>
    rotate y*45 scale <1,1,.5> translate <-.5,0,2>
  }
  pigment { rgb 1 }
  normal
  { gradient x 1 slope_map { [0 <0,1>][.1 <1,1>][.1 <1,0>][1 <1,0>] }
    scale 1.8
  }
}
box { <-1.999,-1,-2><-2,1,2> pigment { rgb x } }
box { <1.999,-1,-2><2,1,2> pigment { rgb z } }

superellipsoid
{ <1,.3> rotate x*90 scale <.25,.1,.25> translate <1, .9, 1.5>
  pigment { rgb 1 }
}
superellipsoid
{ <1,.3> scale <.25,.25,.2> translate <1, 0, 1.8>
  pigment { rgb 1 }
}
superellipsoid
{ <1,.3> scale <.25,.25,.2> translate <-1.2, 0, 1.8>
  pigment { rgb 1 }
}


-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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