Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
GLUUNPROJECT()							GLUUNPROJECT()

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 coordi-
       nates 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	multi-
       plies 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, gluProject

								GLUUNPROJECT()

NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=gluUnProject&sektion=3&manpath=FreeBSD+12.1-RELEASE+and+Ports>

home | help