NAME
	  fgluOrtho2D -	define a 2D orthographic projection matrix


     FORTRAN SPECIFICATION
	  SUBROUTINE fgluOrtho2D( REAL*8 left,
				  REAL*8 right,
				  REAL*8 bottom,
				  REAL*8 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
	  fgluOrtho2D sets up a	two-dimensional	orthographic viewing
	  region. This is equivalent to	calling	glOrtho	with near=-1
	  and far=1.

     SEE ALSO
	  glOrtho, fgluPerspective