A fanatic is one who can't change his mind and won't
change the subject.  - Winston Churchill

Chapter 5 - Lighting
====================

So far in the first four chapters, we have 
used the effects of lighting to make the scenes
more real.  Although, we did not mention it
nor discuss the details of how this was achieved,
the real effects of graphics take a new turn when
lighting is enabled in a scene.  In this chapter
we will study as to how to incorporate lighting
into our renderings to make them more realistic.

With OpenGL, you can manipulate the lighting and
objects in a scene to create many different kinds 
of effects.  This chapter will examine :

  o  Hidden surface removal
  o  Real world and OpengGL lighting
  o  Creating light sources
  o  Selecting a lighting model
  o  Defining material properties