GLUPROJECT
GLUPROJECT
NAMEC SPECIFICATION
PARAMETERS
DESCRIPTION
SEE ALSO
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 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:
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:
SEE ALSO
glGet(3G), gluUnProject(3G)
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