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GLORTHO(3G)				  OpenGL Manual 			      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 nearVal, GLdouble farVal);

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.

       nearVal, farVal
	   Specify the distances to the nearer and farther depth clipping 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:

       2 right - left 0 0 t x 0 2 top - bottom 0 t y 0 0 -2 farVal - nearVal t z 0 0 0 1

       where t x = - right + left right - leftt y = - top + bottom top - bottomt z = - farVal +
       nearVal farVal - nearVal

       Typically, the matrix mode is GL_PROJECTION, and left bottom - nearVal and right top -
       nearVal 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).  - farVal specifies the location of the far clipping plane. Both nearVal and
       farVal can be either positive or negative.

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

ERRORS
       GL_INVALID_VALUE is generated if left = right, or bottom = top, or near = far.

       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(), glMatrixMode(), glMultMatrix(), glPushMatrix(), glViewport()

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI
       Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014				      GLORTHO(3G)
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