gluUnProject man page on YellowDog

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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 )

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:

			   objX
					 _______________−1

			   objY
					 _______________−1

			  ⎝    ⎠=INV(PM)⎝		  ⎠

			   objZ
					     2(winZ)−1

			    W
						 1
       INV() denotes matrix inversion.	W is an unused variable, included  for
       consistent matrix notation.
SEE ALSO
       glGet(3G), gluProject(3G)

							      GLUUNPROJECT(3G)
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