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gluProject - map object coordinates to window coordinates
GLint
gluProject( GLdouble objX,
GLdouble objY,
GLdouble objZ,
const GLdouble *model,
const GLdouble *proj,
const GLint *view,
GLdouble* winX,
GLdouble* winY,
GLdouble* winZ )
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- 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.
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:
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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:
eqn
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glGet(3G)
, gluUnProject(3G)
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