I apparently don't understand how to use light_groups in POV-Ray and I'm
hoping someone will help me understand them better.  I've constructed a
scene in which I want two parts lit by completely seperate groups of
lights.  It's important for the illusion I'm trying to create.  I've placed
one set of lights and objects into one light_group, and the other into a
seperate light_group, kind of like below:

light_group {
  // one or more light sources
  light_source { ... }

  // objects

  object { ... }
   .
   .
   .
  object { ... }
}

light_group {
  light_source { ... }
  object { ... }
   .
   .
   .
  object { ... }
}

I have not used the global_light keyword in either light group and I have no
global light sources.  Nevertheless, both sets of objects are being lit by
both sets of lights.  It's very frustrating.  Does anyone know if there is
a bug in the light_groups and if so how I can work around it?

Thanks,
  Ray

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