gluProject man page on RedHat
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GLUPROJECT(3G) OpenGL Manual GLUPROJECT(3G)
NAME
gluProject - map object coordinates to window coordinates
C SPECIFICATION
GLint gluProject(GLdouble objX, GLdouble objY, GLdouble objZ,
const GLdouble * model, const GLdouble * proj,
const GLint * view, GLdouble* winX, GLdouble* winY,
GLdouble* winZ);
PARAMETERS
objX, objY, objZ
Specify the object coordinates.
model
Specifies the current modelview matrix (as from a glGetDoublev()
call).
proj
Specifies the current projection matrix (as from a glGetDoublev()
call).
view
Specifies the current viewport (as from a glGetIntegerv() call).
winX, winY, winZ
Return the computed window coordinates.
DESCRIPTION
gluProject transforms the specified object coordinates into window
coordinates using model, proj, and view. The result is stored in winX,
winY, and winZ. A return value of GLU_TRUE indicates success, a return
value of GLU_FALSE indicates failure.
To compute the coordinates, let v = objX objY objZ 1.0 represented as a
matrix with 4 rows and 1 column. Then gluProject computes v ″ as
follows:
v ″ = P × M × v
where P is the current projection matrix proj and M is the current
modelview matrix model (both represented as 4 × 4 matrices in
column-major order).
The window coordinates are then computed as follows:
winX = view 0 + view 2 × v ″ 0 + 1 2
SEE ALSO
gluUnProject(), glGet()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLUPROJECT(3G)
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