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# CentOS 7.0 - man page for glortho (centos section 3G)

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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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