gluUnProject4 man page on YellowDog

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GLUUNPROJECT4(3G)					     GLUUNPROJECT4(3G)

NAME
       gluUnProject4 - map window and clip coordinates to object coordinates

C SPECIFICATION
       GLint gluUnProject4( GLdouble winX,
			    GLdouble winY,
			    GLdouble winZ,
			    GLdouble clipW,
			    const GLdouble *model,
			    const GLdouble *proj,
			    const GLint *view,
			    GLdouble near,
			    GLdouble far,
			    GLdouble* objX,
			    GLdouble* objY,
			    GLdouble* objZ,
			    GLdouble* objW )

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

       clipW	       Specify the clip w coordinate 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).

       near, far       Specifies  the near and far planes (as from a glGetDou‐
		       blev call).

       objX, objY, objZ, objW
		       Returns the computed object coordinates.

DESCRIPTION
       gluUnProject4 maps the specified window coordinates winX, winY and winZ
       and  its	 clip  w coordinate clipW into object coordinates (objX, objY,
       objZ, objW) using model, proj and view. clipW can be other  than	 1  as
       for  vertices in glFeedbackBuffer when data type GL_4D_COLOR_TEXTURE is
       returned.  This also handles the case where the near and far planes are
       different  from	the default, 0 and 1, respectively.  A return value of
       GL_TRUE indicates success; a return value of GL_FALSE  indicates	 fail‐
       ure.

       To  compute  the coordinates (objX, objY, objZ and objW), gluUnProject4
       multiplies  the	normalized  device  coordinates	 by  the  inverse   of
       model*proj as follows:

			   objX
					 _______________−1

			   objY
					 _______________−1

			  ⎝    ⎠=INV(PM)⎝		  ⎠

			   objZ
					  ____________−1

			   objW
					       clipW

       INV() denotes matrix inversion.

       gluUnProject4  is equivalent to gluUnProject when clipW is 1, near is 0
       and far is 1.

NOTES
       gluUnProject4 is available only if the GLU version is 1.3 or greater.

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

							     GLUUNPROJECT4(3G)
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