glOrtho man page on DigitalUNIX

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glOrtho(3G)							   glOrtho(3G)

       glOrtho - multiply the current matrix with an orthographic matrix

       void glOrtho(
	       GLdouble left,
	       GLdouble right,
	       GLdouble bottom,
	       GLdouble top,
	       GLdouble zNear,
	       GLdouble zFar );

       Specify	the  coordinates  for  the  left  and  right vertical clipping
       planes.	Specify the coordinates for  the  bottom  and  top  horizontal
       clipping planes.	 Specify the distances to the nearer and farther depth
       clipping planes. These values are negative if the plane is to be behind
       the viewer.

       glOrtho()  describes  a transformation that produces a parallel projec‐
       tion. 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  /  zFar  -  zNear    t[z]  0
       0	    0		 1

       where  t[x] = - right + left / right - left t[y] = - top + bottom / top
       - bottom t[z] = zFar + zNear / zFar - zNear

       Typically,  the	matrix	mode  is  GL_PROJECTION,  and  (left,  bottom,
       -zNear)	and (right, top,  -zNear) specify the points on the near clip‐
       ping 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). -zFar specifies the location of the far clipping plane. Both	 zNear
       and zFar can be either positive or negative.

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

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

       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

       glFrustum(3),	glMatrixMode(3),   glMultMatrix(3),   glPushMatrix(3),


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