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 glGet‐
                       Doublev 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 coor‐
       dinates 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  fol‐
       lows:

       v′=P×M×v

       where  P  is  the  current projection matrix proj, M is the current mod‐
       elview matrix model (both represented as 4×4  matrices  in  column-major
       order) and '×' represents matrix multiplication.

       The window coordinates are then computed as follows:

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

                                                                 GLUPROJECT(3G)