Uncle Ed's Rule of thumb:
Never use your thumb for a rule. You'll either hit
it with a hammer or get a splinter in it.

Concept 3.2h : Drawing Quadrilaterals in 3D Space
==================================================

Idea:
=====
OpenGL provides GL_QUADS to render quadrilaterals.
A call to glBegin(GL_QUADS) draws :
A series of quadrilaterals (four sided polygons) 
using vertices V0,V1,V2,V3 then V4,V5,V6,V7 and so on.  
If  n is not a multiple of 4 the final one, two or 
three vertices may be ignored.

Experiment:
===========
Draw our good old house from Concept 3.3.2c using 
GL_QUADS.