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 Geometry GL "GeoGL" - Camera Demonstration #3
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  Copyright (C) 2000 William Garrison 
  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the Free
  Software Foundation; either version 2 of the License, or (at your option)
  any later version.  This program is distributed in the hope that it will be
  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
  Public License for more details.

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 PURPOSE:
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  GeoGL camera demonstration #3.  Builds on demo #1 by adding visibility
  determination code to inform the viewer of which objects are on the screen
  for a given frame, and optimize drawing by only rendering visible objects.
  Compile with MSVC 6.

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