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gluUnProject - map window coordinates to object coordinates 
 
GLint
gluUnProject( GLdouble winX, 
    GLdouble winY,
    GLdouble winZ,
    const GLdouble *model,
    const GLdouble *proj,
    const GLint *view,
    GLdouble* objX,
    GLdouble* objY,
    GLdouble* objZ )
 eqn not supported
- 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. 
gluUnProject 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), gluUnProject multiplies
the normalized device coordinates by the inverse of model*proj as follows:
 
eqn not supported
 $INV()$ denotes matrix inversion.  W is an unused variable,
included for consistent matrix notation. 
glGet(3G)
, gluProject(3G)
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