Glu.UnProject4 (gb.opengl.glu)
Static Function UnProject4 ( WindowX As Float, WindowY As Float, WindowZ As Float, ClipW As Float, Modelview As Float[], Projection As Float[], Viewport As Integer[], NearValue As Float, FarValue As Float ) As Float[]
Map window and clip coordinates to object coordinates.
Parameters
- winX, winY, winZ
-
Specify the window coordinates to be mapped.
- clipW
-
Specify the clip w coordinate to be mapped.
- model
-
Specifies the modelview matrix (as from a Gl.GetDoublev call).
- proj
-
Specifies the projection matrix (as from a Gl.GetDoublev call).
- view
-
Specifies the viewport (as from a Gl.GetIntegerv call).
- nearVal, farVal
-
Specifies the near and far planes (as from a Gl.GetDoublev call).
- objX, objY, objZ, objW
-
Returns the computed object coordinates.
Description
Glu.UnProject4 maps the specified window coordinatesi:
winX,
winY, and
winZ
and its clip w coordinate
clipW
into object
coordinates
using
model,
proj, and
view.
clipW can be other than
1 as for vertices in Gl.FeedbackBuffer when data type
Glu.4D_COLOR_TEXTURE is returned.
This also handles the case
where the
nearVal and
farVal planes are different from the default,
0 and 1, respectively.
A return
value of Glu.TRUE indicates success; a return value of Glu.FALSE
indicates failure.
To compute the coordinates
,
Glu.UnProject4 multiplies the normalized device coordinates by the inverse of
model proj as follows:
denotes matrix inversion.
Glu.UnProject4 is equivalent to Glu.UnProject when
clipW is 1,
nearVal is 0, and
farVal is 1.
Notes
Glu.UnProject4 is available only if the GLU version is 1.3 or greater.
See also
Glu.Project
Glu.UnProject
Gl.FeedbackBuffer
Gl.Get