GLint sKnotCount,
                                        GLfloat* sKnots,
                                        GLint tKnotCount,
                                        GLfloat* tKnots,
                                        GLint sStride,
                                        GLint tStride,
                                        GLfloat* control,
                                        GLint sOrder,
                                        GLint tOrder,
                                        GLenum type )

PARAMETERS
       nurb        Specifies     the     NURBS     object     (created     with
                   gluNewNurbsRenderer).

       sKnotCount  Specifies the number of knots in the parametric u direction.

       sKnots      Specifies an array of sKnotCount nondecreasing  knot  values
                   in the parametric u direction.

       tKnotCount  Specifies the number of knots in the parametric v direction.

       tKnots      Specifies  an  array of tKnotCount nondecreasing knot values
                   in the parametric v direction.

       sStride     Specifies the offset (as a number of single-precision float‐
                   ing  point  values) between successive control points in the
                   parametric u direction in control.

       tStride     Specifies the  offset  (in  single-precision  floating-point
                   values)  between successive control points in the parametric
                   v direction in control.

       control     Specifies an array containing control points for  the  NURBS
                   surface.   The  offsets between successive control points in
                   the parametric u and v directions are given by  sStride  and
                   tStride.

       sOrder      Specifies the order of the NURBS surface in the parametric u
                   direction. The order is one more than the  degree,  hence  a
                   surface that is cubic in u has a u order of 4.

       tOrder      Specifies the order of the NURBS surface in the parametric v
                   direction. The order is one more than the  degree,  hence  a
                   surface that is cubic in v has a v order of 4.

       type        Specifies  type of the surface. type can be any of the valid
                   two-dimensional evaluator types (such as GL_MAP2_VERTEX_3 or
                   GL_MAP2_COLOR_4).

DESCRIPTION
       Use  gluNurbsSurface within a NURBS (Non-Uniform Rational B-Spline) sur‐
       A NURBS surface can be trimmed by using the commands  gluNurbsCurve  and
       gluPwlCurve between calls to gluBeginTrim and gluEndTrim.

       Note that a gluNurbsSurface with sKnotCount knots in the u direction and
       tKnotCount knots in the v direction with orders sOrder and  tOrder  must
       have (sKnotCount - sOrder) × (tKnotCount - tOrder) control points.

EXAMPLE
       The following commands render a textured NURBS surface with normals; the
       texture coordinates and normals are also NURBS surfaces:

       gluBeginSurface(nobj);
          gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
          gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
          gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4); gluEndSurface(nobj);

SEE ALSO
       gluBeginSurface,   gluBeginTrim,   gluNewNurbsRenderer,   gluNurbsCurve,
       gluPwlCurve

                                                            GLUNURBSSURFACE(3G)