GLUPROJECT(3G)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 )
delim $$
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 GL_TRUE indicates success, a return value of GL_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 $v sup prime$ as follows:
v sup prime ~=~ P ~times~ M ~times~ v
where $P$ is the current projection matrix proj, $M$ is the current modelview matrix model (both represented as $4 times 4$ matrices in
column-major order) and '$times$' represents matrix multiplication.
The window coordinates are then computed as follows:
"winX" ~=~ "view" (0) ~+~ "view" (2) ~*~ (v sup prime(0) ~+~ 1)~/~2
"winY" ~=~ "view" (1) ~+~ "view" (3)~*~(v sup prime(1) ~+~ 1)~/~2
"winZ" ~=~ (v sup prime(2) ~+~ 1)~/~ 2
SEE ALSO glGet(3G), gluUnProject(3G)GLUPROJECT(3G)
Check Out this Related Man Page
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 x M x v
where P is the current projection matrix proj and M is the current modelview matrix model (both represented as 4 x 4 matrices in
column-major order).
The window coordinates are then computed as follows:
winX = view 0 + view 2 x v '' 0 + 1 2.PP winY = view 1 + view 3 x v '' 1 + 1 2.PP winZ = v '' 2 + 1 2
SEE ALSO
gluUnProject(), glGet()
COPYRIGHT
Copyright (C) 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 06/10/2014 GLUPROJECT(3G)
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