fgluUnProject(3G) OpenGL Reference fgluUnProject(3G)NAMEfgluUnProject - 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.
DESCRIPTIONfgluUnProject 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 )
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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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