GLUPROJECT(3G)															    GLUPROJECT(3G)

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 )

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 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) 'X' 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

       winZ = (v'(2) + 1) / 2

SEE ALSO

       glGet, gluUnProject

																    GLUPROJECT(3G)