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GLORTHO(3G)							   GLORTHO(3G)

NAME
       glOrtho - multiply the current matrix with an orthographic matrix

C SPECIFICATION
       void glOrtho( GLdouble left,
		     GLdouble right,
		     GLdouble bottom,
		     GLdouble top,
		     GLdouble near_val,
		     GLdouble far_val )

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.

       near_val, far_val
		   Specify the distances to the nearer and farther depth clip‐
		   ping planes.	 These values are negative if the plane is  to
		   be behind the viewer.

DESCRIPTION
       glOrtho describes a transformation that produces a parallel projection.
       The current matrix (see glMatrixMode) is multiplied by this matrix  and
       the  result replaces the current matrix, as if glMultMatrix were called
       with the following matrix as its argument:

		      __________      0		    0	     tx

			  0	 __________	    0	     ty

		     ⎝					       ⎠

			  0	     0	    ________________ tz

			  0	     0		   0	     1

       where
				   tx=−__________

				   ty=−__________

				tz=−________________

Typically, the matrix mode is GL_PROJECTION, and  (left,  bottom,   -near_val)
and  (right,  top,   -near_val)	 specify the points on the near clipping plane
that are mapped to the lower left and  upper  right  corners  of  the  window,
respectively,  assuming that the eye is located at (0, 0, 0).  -far_val speci‐
fies the location of the far clipping plane.  Both near_val and far_val can be
either positive or negative.

Use glPushMatrix and glPopMatrix to save and restore the current matrix stack.

ERRORS
       GL_INVALID_OPERATION  is	 generated  if glOrtho is executed between the
       execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGet with argument GL_MATRIX_MODE
       glGet with argument GL_COLOR_MATRIX
       glGet with argument GL_MODELVIEW_MATRIX
       glGet with argument GL_PROJECTION_MATRIX
       glGet with argument GL_TEXTURE_MATRIX

SEE ALSO
       glFrustum(3G),  glMatrixMode(3G),  glMultMatrix(3G),  glPushMatrix(3G),
       glViewport(3G)

								   GLORTHO(3G)

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