OpenGL-2D_2_3D

OpenGL

gluUnProject

The gluUnProject function maps window coordinates to object coordinates. 

int gluUnProject(
  GLdouble winx,
  GLdouble winy,
  GLdouble winz,
  const GLdouble modelMatrix[16],
  const GLdouble projMatrix[16],
  const GLint viewport[4],
  GLdouble *objx,
  GLdouble *objy,
  GLdouble *objz
);

Parameters

winx, winy, winz

The window coordinates to be mapped.

modelMatrix

The modelview matrix (as from a glGetDoublev call).

projMatrix

The projection matrix (as from a glGetDoublev call).

viewport

The viewport (as from a glGetIntegerv call).

objx, objy, objz

The computed object coordinates.

Return Values

If the function succeeds, the return value is GL_TRUE.

If the function fails, the return value is GL_FALSE.

Remarks

The gluUnProject function maps the specified window coordinates into object coordinates using modelMatrix, projMatrix, and viewport. The result is stored in objx, objy, and objz.

Requirements

  Windows NT/2000: Requires Windows NT 3.5 or later.   Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.   Header: Declared in Glu.h.   Library: Use Glu32.lib.

See Also

glGet, glGetDoublev, glGetIntegerv, gluProject