1GLUUNPROJECT(3G)                 OpenGL Manual                GLUUNPROJECT(3G)
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NAME

6       gluUnProject - map window coordinates to object coordinates
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C SPECIFICATION

9       GLint gluUnProject(GLdouble winX, GLdouble winY, GLdouble winZ,
10                          const GLdouble * model, const GLdouble * proj,
11                          const GLint * view, GLdouble* objX, GLdouble* objY,
12                          GLdouble* objZ);
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PARAMETERS

15       winX, winY, winZ
16           Specify the window coordinates to be mapped.
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18       model
19           Specifies the modelview matrix (as from a glGetDoublev() call).
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21       proj
22           Specifies the projection matrix (as from a glGetDoublev() call).
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24       view
25           Specifies the viewport (as from a glGetIntegerv() call).
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27       objX, objY, objZ
28           Returns the computed object coordinates.
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DESCRIPTION

31       gluUnProject maps the specified window coordinates into object
32       coordinates using model, proj, and view. The result is stored in objX,
33       objY, and objZ. A return value of GLU_TRUE indicates success; a return
34       value of GLU_FALSE indicates failure.
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36       To compute the coordinates objX objY objZ, gluUnProject multiplies the
37       normalized device coordinates by the inverse of model * proj as
38       follows:
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40       objX objY objZ W = INV ⁡ P ⁢ M ⁢ 2 ⁡ winX - view ⁡ 0 view ⁡ 2 - 1 2 ⁡
41       winY - view ⁡ 1 view ⁡ 3 - 1 2 ⁡ winZ - 1 1INV denotes matrix
42       inversion. W is an unused variable, included for consistent matrix
43       notation.
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SEE ALSO

46       gluProject(), glGet()
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49       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
50       under the SGI Free Software B License. For details, see
51       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

54       opengl.org
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58opengl.org                        06/10/2014                  GLUUNPROJECT(3G)
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