GLint knotCount,
                                      GLfloat *knots,
                                      GLint stride,
                                      GLfloat *control,
                                      GLint order,
                                      GLenum type )

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

       knotCount  Specifies the number of knots in knots.  knotCount equals the
                  number of control points plus the order.

       knots      Specifies an array of knotCount nondecreasing knot values.

       stride     Specifies  the offset (as a number of single-precision float‐
                  ing-point values) between successive curve control points.

       control    Specifies a pointer to an array of control points. The  coor‐
                  dinates must agree with type, specified below.

       order      Specifies the order of the NURBS curve. order equals degree +
                  1, hence a cubic curve has an order of 4.

       type       Specifies the type of the curve. If  this  curve  is  defined
                  within a gluBeginCurve/gluEndCurve pair, then the type can be
                  any of the valid one-dimensional  evaluator  types  (such  as
                  GL_MAP1_VERTEX_3     or     GL_MAP1_COLOR_4).    Between    a
                  gluBeginTrim/gluEndTrim  pair,  the  only  valid  types   are
                  GLU_MAP1_TRIM_2 and GLU_MAP1_TRIM_3.

DESCRIPTION
       Use gluNurbsCurve to describe a NURBS curve.

       When  gluNurbsCurve appears between a gluBeginCurve/gluEndCurve pair, it
       is used to describe a curve to be rendered.   Positional,  texture,  and
       color  coordinates  are  associated  by  presenting  each  as a separate
       gluNurbsCurve between a gluBeginCurve/gluEndCurve pair. No more than one
       call  to gluNurbsCurve for each of color, position, and texture data can
       be made within a single gluBeginCurve/gluEndCurve pair. Exactly one call
       must  be  made  to  describe  the  position  of  the  curve  (a  type of
       GL_MAP1_VERTEX_3 or GL_MAP1_VERTEX_4).

       When gluNurbsCurve appears between a gluBeginTrim/gluEndTrim pair, it is
       used  to  describe  a  trimming  curve  on  a  NURBS surface. If type is
       GLU_MAP1_TRIM_2, then it describes a curve in two-dimensional (u and  v)
       parameter  space. If it is GLU_MAP1_TRIM_3, then it describes a curve in
       two-dimensional homogeneous (u, v, and  w)  parameter  space.   See  the
       gluBeginTrim reference page for more discussion about trimming curves.

EXAMPLE