gluNurbsCurve man page on DigitalUNIX

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gluNurbsCurve()						       gluNurbsCurve()

       gluNurbsCurve - define the shape of a NURBS curve

       void gluNurbsCurve(
	       GLUnurbs* nurb,
	       GLint knotCount,
	       GLfloat *knots,
	       GLint stride,
	       GLfloat *control,
	       GLint order,
	       GLenum type );

       Specifies the NURBS object (created with gluNewNurbsRenderer()).	 Spec‐
       ifies the number of knots in knots.  knotCount  equals  the  number  of
       control	points plus the order.	Specifies an array of knotCount nonde‐
       creasing knot values.  Specifies the offset (as a number of single-pre‐
       cision  floating-point values) between successive curve control points.
       Specifies a pointer to an array of control points. The coordinates must
       agree  with  type,  specified  below.  Specifies the order of the NURBS
       curve.  order equals degree + 1, hence a cubic curve has an order of 4.
       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.

       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,  tex‐
       ture, and color coordinates are associated by presenting each as a sep‐
       arate 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 trim‐
       ming curves.

       To define trim curves which stitch well, use gluPwlCurve().

       The following commands render a	textured  NURBS	 curve	with  normals:
	   gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
	   gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
	   gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4); gluEndCurve(nobj);

       gluBeginCurve(3),   gluBeginTrim(3),   gluNewNurbsRenderer(3),  gluPwl‐


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