glOrtho man page on OpenBSD

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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 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:

       left (  matrix {
	  ccol { {2 over {"right" - "left"}} above 0 above 0 above 0 }
	  ccol { 0 above {2 over {"top" - "bottom"}} above 0 above 0 }
	  ccol { 0 above 0 above {-2 over {"far_val" - "near_val"}}  above 0
       }
	  ccol { {t sub x}~ above {t sub y}~ above {t sub z}~ above 1~ } }
       right )

       where t sub x ~=~ -^{{"right" ~+~ "left"} over {"right" ~-~ "left"}}

       t sub y ~=~ -^{{"top" ~+~ "bottom"} over {"top" ~-~ "bottom"}}

       t sub z ~=~ -^{{"far_val" ~+~ "near_val"} over {"far_val" ~-~
       "near_val"}}

       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 specifies 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)

								 March 1, 2011
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