OpenGL Library was made by Ian Mallett (A.K.A. Geometrian).  Email at ian@geometrian.com, or visit website http://www.geometrian.com/Programs.php

You are free to use this code, just don't take credit for my work.

In that spirit, here are the many sources who have made this work possible:

For shadow mapping:
-Alessio's shadow demo:
 http://www.pygame.org/project/556/
-Paul's Projects shadow mapping tutorial (Alessio's demo based on):
 http://www.paulsprojects.net/tutorials/smt/smt.html
-Discussion about shadow mapping demo on pygame mailing list:
 http://archives.seul.org/pygame/users/Mar-2008/msg00302.html
-Hardware Shadow Mapping, by Cass Everitt, Ashu Rege and Cem Cebenoyan:
 http://developer.nvidia.com/object/hwshadowmap_paper.html
-Shadow Mapping, by Cass Everitt:
 http://developer.nvidia.com/object/shadow_mapping.html
-Projective Texture Mapping, by Cass Everitt:
 http://developer.nvidia.com/object/Projective_Texture_Mapping.html
-Perspective shadow maps, by daniel scherzer:
 http://www.cg.tuwien.ac.at/~scherzer/psm/
 http://www.cg.tuwien.ac.at/~scherzer/
-Light Space Perspective Shadow Maps: 
 http://www.cg.tuwien.ac.at/research/vr/lispsm
-Dephi3d.net shadow demos:
 http://www.delphi3d.net/listfiles.php?category=4
-Shadow Modifications:
 http://rene.f0o.com/~rene/stuff/rd_shadows2.zip
-Countless people on gamedev.net for their invaluable help