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Man Pages


Manual Reference Pages  -  GLUPROJECT (3)

NAME

gluProject - map object coordinates to window coordinates

CONTENTS

C Specification
Parameters
Description
See Also

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' as follows:

v' = P times M times v

where P is the current projection matrix proj, M is the current modelview matrix model (both represented as 4times4 matrices in column-major order) and ’times’ represents matrix multiplication.

The window coordinates are then computed as follows:

winX = view(0) + view(2) * (v' (0) + 1) / 2

winY = view(1) + view(3) * (v' (1) + 1) / 2.EN.sp.EQwinZ = (v' (2) + 1) / 2

SEE ALSO

glGet, gluUnProject

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