GLUUNPROJECT(3G) manual page

Table of Contents

## 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 )

eqn not supported

## 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:

eqn not supported $INV()$ denotes matrix inversion. W is an unused variable, included for consistent matrix notation.

## See Also

glGet(3G) , gluProject(3G)

Table of Contents

- Name
- C Specification
- Parameters
- Description
- See Also