Static Function UnProject ( WindowX As Float, WindowY As Float, WindowZ As Float, Modelview As Float[], Projection As Float[], Viewport As Integer[] ) As Float[]

Map window coordinates to object coordinates.

Parameters

winX, winY, winZ: Specify the window coordinates 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).
objX, objY, objZ: Returns the computed object coordinates.

Description

Glu.UnProject 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 Glu.TRUE indicates success; a return value of Glu.FALSE indicates failure.

To compute the coordinates

(objX, objY, objZ)

, Glu.UnProject multiplies the normalized device coordinates by the inverse of model proj as follows:

(\begin{matrix} objX \\ objY \\ objZ \\ W \end{matrix}) INV (P M) (\begin{matrix} \frac{2 (winX - view [/0])}{view [/2]} - 1 \\ \frac{2 (winY - view [/1])}{view [/3]} - 1 \\ 2 (winZ) - 1 \\ 1 \end{matrix})

INV

denotes matrix inversion. W is an unused variable, included for consistent matrix notation.

Glu.UnProject (gb.opengl.glu)

Parameters

Description

See also