I want to show a scene in which part is in an underground cavity, as in the
scene below.

The cavity is to be lit from local lights and light coming down the two holes in
the y plane but no light should come through the cross-section z plane. How do I
block this off?

// Persistence of Vision Ray Tracer Scene Description File
// File: Cavity_below_ground.pov
// Vers: 3.7


#include "colors.inc"
#include "stones1.inc"
  camera {
    location <3, 10, -40>
    look_at <0,3 , 0>
    angle 20
  }
  background { color rgb<0.2, 0.4, 0.8>  }
  light_source { <100, 100, -100> color rgb 1 }
  global_settings {assumed_gamma 1.0 }


difference {
  #intersection  {
    plane {y,6 texture { T_Grnt1}}
    plane {z,-4 inverse  texture {T_Stone14}}
                  }
  #union {
    box {<-20,2,.9>,<20,0,-1> }
    box {<-6,10,1>,<-2,1,-1> }
    box {<6,10,1>,<2,1,-1> }
    box {<-5.5,5,-.5>,<5.5,.1,-100> }
    texture {T_Stone15}     }  }

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