GLintknotCount, GLfloat*knots, GLintstride, GLfloat*control, GLintorder, GLenumtype)

**eqn not supported**

*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 floating-point values) between successive curve control points.
*control*- Specifies a pointer to an array of control points.
The coordinates 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**.

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.

gluBeginCurve(nobj)
; gluNurbsCurve(nobj,
..., GL_MAP1_TEXTURE_COORD_2);

gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);

gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);

gluEndCurve(nobj)
;