Serving coffee on aircrafts causes turbulence

Concept7 : Drawing Objects
==========================

Idea:
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OpenGL provides basic primitive for rendering.  Here we 
look at one such primitive, a polygon.

Experiment:
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Enter different values for the vertices in the boxes 
provided.  Note only values for X, Y are declared.  The
Z values are assumed to be zero.

Try this set the values to really large numbers or really 
small (negative numbers).  What happens to our polygon?.  
The reason we dont see it at all or see only part of it is 
because our camera is focussed at the orign.  We shall talk 
about camera positions in later chapters.

Exercise:
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In Concept6 we tossed around the idea of the orign of the 
OpenGL coordinate system.  Use the above template to 
figure it out.  
Hint : Set one of the vertices x, and y coordinates
to (0.0, 0.0) and see what happens.  Did you figure it
out?.