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-_C_ License Applicability. Except to the extent portions of this file are
-_C_ made subject to an alternative license as permitted in the SGI Free
-_C_ Software License B, Version 1.1 (the "License"), the contents of this
-_C_ file are subject only to the provisions of the License. You may not use
-_C_ this file except in compliance with the License. You may obtain a copy
-_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
-_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
-_C_ 
-_C_ http://oss.sgi.com/projects/FreeB
-_C_ 
-_C_ Note that, as provided in the License, the Software is distributed on an
-_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
-_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
-_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
-_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
-_C_ 
-_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
-_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
-_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
-_C_ Copyright in any portions created by third parties is as indicated
-_C_ elsewhere herein. All Rights Reserved.
-_C_ 
-_C_ Additional Notice Provisions: The application programming interfaces
-_C_ established by SGI in conjunction with the Original Code are The
-_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
-_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
-_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
-_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
-_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
-_C_ published by SGI, but has not been independently verified as being
-_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
-_C_
-_C_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
-_C_ The first character in this file must be an '_'!
-_C_ Anything on a line after _C_ is ignored
-_define(_filters,eqn)_C_
-_C_      eqn is automatically replaced with neqn for nroff
-_header(PickMatrix, define a picking region)
-_names(PickMatrix)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1 _param2)
-Specify the center of a picking region in window coordinates.
-_phead(_param3 _param4)
-Specify the width and height, respectively, of the picking region in window 
-coordinates.
-_phead(_param5)
-Specifies the current viewport (as from a _glcmnd(GetIntegerv) call).
-.SH DESCRIPTION
-_cmnd creates a projection matrix that can be used to restrict drawing
-to a small region of the viewport.
-This is typically useful to
-determine what objects are being drawn near the cursor.
-Use _cmnd to
-restrict drawing to a small region around the cursor.
-Then,
-enter selection mode (with _glcmnd(RenderMode)) and rerender the scene.
-All primitives that would have been drawn near
-the cursor are identified and stored in the selection buffer.
-.P
-The matrix created by _cmnd is multiplied by the current matrix just
-as if _glcmnd(MultMatrix) is called with the generated matrix.
-To effectively use the generated pick matrix for picking,
-first call _glcmnd(LoadIdentity) to load an identity matrix onto the
-perspective matrix stack.
-Then call _cmnd,
-and finally, call a command (such as _cmnd(Perspective))
-to multiply the perspective matrix by the pick matrix.
-.P
-When using _cmnd to pick NURBS, be careful to turn off the NURBS 
-property
-_gluconst(AUTO_LOAD_MATRIX).  If _gluconst(AUTO_LOAD_MATRIX) is not
-turned off, then any NURBS surface rendered is subdivided differently with
-the pick matrix than the way it was subdivided without the pick matrix.
-.bp
-.SH EXAMPLE
-When rendering a scene as follows:
-.sp
-.Ex
-glMatrixMode(GL_PROJECTION);
-glLoadIdentity();
-gluPerspective(...);
-glMatrixMode(GL_MODELVIEW);
-/* Draw the scene */
-.Ee
-.sp
-a portion of the viewport can be selected as a pick region like this:
-.sp
-.Ex
-glMatrixMode(GL_PROJECTION);
-glLoadIdentity();
-gluPickMatrix(x, y, width, height, viewport);
-gluPerspective(...);
-glMatrixMode(GL_MODELVIEW);
-/* Draw the scene */
-.Ee
-.SH SEE ALSO
-_glcmnd(Get),
-_glcmnd(LoadIndentity), 
-_glcmnd(MultMatrix), 
-_glcmnd(RenderMode),
-_cmnd(Perspective)
-