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gluOrtho2D - define a 2D orthographic projection matrix 
 
void
gluOrtho2D( GLdouble left, 
    GLdouble right,
    GLdouble bottom,
    GLdouble top )
 eqn not supported
- left, right 
- Specify the coordinates for the
left and right vertical clipping planes. 
- bottom, top 
- Specify the coordinates
for the bottom and top horizontal clipping planes. 
gluOrtho2D
sets up a two-dimensional orthographic viewing region.   This is equivalent
to calling glOrtho with $ near ~=~ -1 $ and  $ far ~=~ 1 $. 
glOrtho(3G)
,
gluPerspective(3G) 
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