gluUnProject man page on OpenBSD

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GLUUNPROJECT(3G)					      GLUUNPROJECT(3G)

NAME
       gluUnProject - map window coordinates to object coordinates

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

       delim $$

PARAMETERS
       winX, winY, winZ
	      Specify the window coordinates to be mapped.

       model  Specifies the modelview matrix (as from a glGetDoublev call).

       proj   Specifies the projection matrix (as from a glGetDoublev call).

       view   Specifies the viewport (as from a glGetIntegerv call).

       objX, objY, objZ
	      Returns the computed object coordinates.

DESCRIPTION
       gluUnProject maps the specified window coordinates into object
       coordinates 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
       multiplies the normalized device coordinates by the inverse of
       model*proj as follows:

       left ( down 70 {cpile { ~"objX" above ~"objY" above ~"objZ" above ~W}}
       ~~ right ) ~=~ INV(P M) left ( down 140 {cpile { { {2("winX" ~-~
       "view"[0])} over {"view" [2]} ~-~ 1 } above { {2("winY" ~-~ "view"[1])}
       over {"view"[3]} ~-~ 1 } above { 2("winZ") ~-~ 1 } above 1}} ~~ right )
       $INV()$ denotes matrix inversion.  W is an unused variable, included
       for consistent matrix notation.

SEE ALSO
       glGet(3G), gluProject(3G)

								 March 1, 2011
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