fgluUnProject man page on IRIX

fgluUnProject man page on IRIX

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fgluUnProject(3G)	       OpenGL Reference		     fgluUnProject(3G)

NAME
     fgluUnProject - map window coordinates to object coordinates

FORTRAN SPECIFICATION
     INTEGER*4 fgluUnProject( REAL*4 winX,
			      REAL*4 winY,
			      REAL*4 winZ,
			      CHARACTER*8 model,
			      CHARACTER*8 proj,
			      CHARACTER*8 view,
			      CHARACTER*8 objX,
			      CHARACTER*8 objY,
			      CHARACTER*8 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
     fgluUnProject 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), fgluUnProject
     multiplies the normalized device coordinates by the inverse of model*proj
     as follows:

		   ( objX  ) = INV(PM)(_________________ - 1  )

									Page 1

fgluUnProject(3G)	       OpenGL Reference		     fgluUnProject(3G)

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

SEE ALSO
     glGet, fgluProject

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