gluUnProject man page on DigitalUNIX

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gluUnProject()							gluUnProject()

       gluUnProject - map window coordinates to object coordinates

       GLint gluUnProject(
	       GLdouble winX,
	       GLdouble winY,
	       GLdouble winZ,
	       const GLdouble *model,
	       const GLdouble *proj,
	       const GLint *view,
	       GLdouble* objX,
	       GLdouble* objY,
	       GLdouble* objZ );

       Specify	the  window coordinates to be mapped.  Specifies the modelview
       matrix (as from	a  glGetDoublev()  call).   Specifies  the  projection
       matrix  (as  from  a  glGetDoublev() call).  Specifies the viewport (as
       from a glGetIntegerv() call).  Returns the computed object coordinates.

       gluUnProject() maps the specified window coordinates into object	 coor‐
       dinates	using  model,  proj,  and  view. The result is stored in objX,
       objY, and objZ. A return value of GL_TRUE indicates success;  a	return
       value of GL_FALSE indicates failure.

       To  compute the coordinates (objX, objY, and objZ), gluUnProject() mul‐
       tiplies the normalized device coordinates by the inverse of  model*proj
       as follows:
			   (2(winX    -	   view[0])   /	  view[2])   -1	  objX
       (2(winY	 -   view[1])	/   view[3])   -1   objY    =	INV(PM)	  objZ
       2(winZ) -1 W			       1

       INV()  denotes  matrix inversion. W is an unused variable, included for
       consistent matrix notation.

       glGet(3), gluProject(3)


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