GLUPROJECT() GLUPROJECT() 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 glGetDou- blev call). proj Specifies the current projection matrix (as from a glGet- Doublev 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 coordi- nates 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 $v = ("objX", "objY", "objZ", 1.0)$ repre- sented 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 mod- elview matrix model (both represented as $4 times 4$ matrices in column-ma- jor 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 .EN "winZ" ~=~ (v sup prime (2) ~+~ 1)~/~ 2 SEE ALSO glGet, gluUnProject GLUPROJECT()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | SEE ALSO
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