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GLUUNPROJECT() GLUUNPROJECT() 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 ) delim $$ 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: left ( down 70 {cpile { ~"objX" above ~"objY" above ~"objZ" above ~W}} ~~ right ) ~=~ INV(P M) left ( down 140 {cpile { { {2("winX" ~-~ "view"[0])} over {"view" [2]} ~-~ 1 } above { {2("winY" ~-~ "view"[1])} over {"view"[3]} ~-~ 1 } above { 2("winZ") ~-~ 1 } above 1}} ~~ right ) $INV()$ denotes matrix inversion. W is an unused variable, included for consistent matrix notation. SEE ALSO glGet, gluProject GLUUNPROJECT()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | SEE ALSO
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