gluOrtho2D.3G - Man Page

void gluOrtho2D( GLdouble left,

	GLdouble right,
	GLdouble bottom,
	GLdouble top )

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)

gluPerspective.3G(3).