NAME
	  gluOrtho2D - define a	2D orthographic	projection matrix


     C SPECIFICATION
	  void gluOrtho2D( GLdouble left,
			   GLdouble right,
			   GLdouble bottom,
			   GLdouble top	)


     PARAMETERS
	  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.

     DESCRIPTION
	  gluOrtho2D sets up a two-dimensional orthographic viewing
	  region. This is equivalent to	calling	glOrtho	with near=-1
	  and far=1.

     SEE ALSO
	  glOrtho, gluPerspective