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gluProject.3gl
Langue: en
Version: 375020 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
NAME
gluProject - map object coordinates to window coordinatesC 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)Contenus ©2006-2024 Benjamin Poulain
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