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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(UnProject, map window coordinates to object coordinates)
+_names(UnProject)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1 _param2 _param3)
+Specify the window coordinates to be mapped.
+_phead(_param4)
+Specifies the modelview matrix (as from a _glcmnd(GetDoublev) call).
+_phead(_param5)
+Specifies the projection matrix (as from a _glcmnd(GetDoublev) call).
+_phead(_param6)
+Specifies the viewport (as from a _glcmnd(GetIntegerv) call).
+_phead(_param7 _param8 _param9)
+Returns the computed object coordinates.
+.SH DESCRIPTION
+_cmnd maps the specified window coordinates into object 
+coordinates using _param4, _param5, and _param6.
+The result is stored in _param7, _param8, and _param9. A return value of 
+_const(TRUE) indicates success; a return value of _const(FALSE)
+indicates failure.
+.P
+To compute the coordinates (_param7, _param8, and _param9),
+_cmnd multiplies the normalized device coordinates by the inverse of
+_param4*_param5 as follows:
+
+.P
+.ce
+.EQ
+left ( down 70 {cpile { ~_eqnparam7 above ~_eqnparam8 above ~_eqnparam9
+above ~W}} ~~ right ) ~=~ INV(P M) 
+left ( down 140 {cpile { 
+{ {2(_eqnparam1 ~-~ _eqnparam6[0])} over {_eqnparam6 [2]} ~-~ 1 }
+above 
+{ {2(_eqnparam2 ~-~ _eqnparam6[1])} over {_eqnparam6[3]} ~-~ 1 }
+above 
+{ 2(_eqnparam3) ~-~ 1 }
+above 
+1}} ~~ right )
+.EN
+.bp
+$INV()$ denotes matrix inversion. 
+W is an unused variable, included for consistent matrix notation.
+.SH SEE ALSO
+_glcmnd(Get), _cmnd(Project)