GLUPROJECT(3G) UNIX Programmer's Manual GLUPROJECT(3G)
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 )
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' as follows:
v' = P x M x v
where P is the current projection matrix proj, M is the
current modelview matrix model (both represented as 4x4
matrices in column-major order) and 'x' represents matrix
multiplication.
The window coordinates are then computed as follows:
MirOS BSD #10-current Printed 20.2.2012 1
GLUPROJECT(3G) UNIX Programmer's Manual GLUPROJECT(3G)
winX = view(0) + view(2) * (v'(0) + 1) / 2
winY = view(1) + view(3) * (v'(1) + 1) / 2
winZ = (v'(2) + 1) / 2
glGet(3G), gluUnProject(3G)
MirOS BSD #10-current Printed 20.2.2012 2
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