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
); |
Python Specification
gluUnProject
|
( |
winX
,
winY
,
winZ
,
model = None
,
proj = None
,
view = None
) → (objX,
objY,
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.
Description
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:
INV() denotes matrix inversion. W is an unused variable, included for consistent matrix notation.