08-30-2013
pointsb will hold all the x-y coordinates of this inverse parabola, as printed out by print x,y, separated by <newline> chars.
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LEARN ABOUT OSX
gluunproject4
GLUUNPROJECT4(3G) GLUUNPROJECT4(3G)
NAME
gluUnProject4 - map window and clip coordinates to object coordinates
C SPECIFICATION
GLint gluUnProject4( GLdouble winX,
GLdouble winY,
GLdouble winZ,
GLdouble clipW,
const GLdouble *model,
const GLdouble *proj,
const GLint *view,
GLdouble near,
GLdouble far,
GLdouble* objX,
GLdouble* objY,
GLdouble* objZ,
GLdouble* objW )
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 glGetDoublev call).
proj Specifies the projection matrix (as from a glGetDoublev call).
view Specifies the viewport (as from a glGetIntegerv call).
near, far Specifies the near and far planes (as from a glGetDoublev call).
objX, objY, objZ, objW
Returns the computed object coordinates.
DESCRIPTION
gluUnProject4 maps the specified window coordinates winX, winY and winZ and its clip w coordinate clipW into object coordinates (objX,
objY, objZ, objW) using model, proj and view. clipW can be other than 1 as for vertices in glFeedbackBuffer when data type
GL_4D_COLOR_TEXTURE is returned. This also handles the case where the near and far planes are different from the default, 0 and 1, respec-
tively. A return value of GL_TRUE indicates success; a return value of GL_FALSE indicates failure.
To compute the coordinates (objX, objY, objZ and objW), gluUnProject4 multiplies the normalized device coordinates by the inverse of
model*proj as follows:
2(winX - view[0])
----------------- - 1
view[2]
objX 2(winY - view[1])
objY = INV(PM) ----------------- - 1
objZ view[3]
W
2(winZ - near)
----------------- - 1
(far - near)
clipW
INV() denotes matrix inversion.
gluUnProject4 is equivalent to gluUnProject when clipW is 1, near is 0 and far is 1.
NOTES
gluUnProject4 is available only if the GLU version is 1.3 or greater.
SEE ALSO
glGet, glFeedbackBuffer, gluProject, gluUnProject
GLUUNPROJECT4(3G)