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

                                                                 GLUORTHO2D(3G)