gluunproject(3g) [mojave man page]

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 )

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:

				2(winX - view[0])
				-----------------  - 1
				     view[2]

	   objX 		2(winY - view[1])
	   objY   =  INV(PM)	-----------------  - 1
	   objZ 		     view[3]
	    W
				     2(winZ)	   - 1

					1

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

SEE ALSO

       glGet, gluProject

																  GLUUNPROJECT(3G)

GLUUNPROJECT(3G)						   OpenGL Manual						  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);

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 GLU_TRUE indicates success; a return value of GLU_FALSE indicates failure.

       To compute the coordinates objX objY objZ, gluUnProject multiplies the normalized device coordinates by the inverse of model * proj as
       follows:

       objX objY objZ W = INV  P  M  2	winX - view  0 view  2 - 1 2  winY - view  1 view  3 - 1 2  winZ - 1 1INV denotes matrix inversion. W is
       an unused variable, included for consistent matrix notation.

SEE ALSO

       gluProject(), glGet()

COPYRIGHT

       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014							  GLUUNPROJECT(3G)