Q. How do you play religious roulette?
A: You stand around in a circle and blaspheme and
   see who gets struck by lightining first.

Concept 3.1 : Fog
=================

Idea:
=====
We can make our images more natural by adding fog, 
which makes objects fade into the distance.  Fog is 
a general term that describes similar forms of atmospheric 
effects; it can be used to simulate haze, mist, smoke 
or pollution.

When fog is enabled, objects that are farther
away from the viewpoint begin to fade into the
fog color.  We can control the density of the fog
which determines the rate at which objects fade as
the distance increases, as well as the fog's color.  

For is applied after matrix transformations,
lighting, and texturing are performed, so it affects 
transformed, lit, and textured objects.  

Using Fog
=========
Fog is easy to use.  It is enabled by passing GL_FOG
to glEnable() and then all we have to do is to 
choose the color of the fog and the equation that
controls the density with glFog*().  Again a value
for GL_FOG_HINT can be supplied as explained before.