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Table of Contents
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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