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GLUNURBSSURFACE(3G)		 OpenGL Manual		   GLUNURBSSURFACE(3G)

NAME
       gluNurbsSurface - define the shape of a NURBS surface

C SPECIFICATION
       void gluNurbsSurface(GLUnurbs* nurb, 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
	   floating-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 GLU_MAP2_VERTEX_3 or
	   GLU_MAP2_COLOR_4).

DESCRIPTION
       Use gluNurbsSurface within a NURBS (Non-Uniform Rational B-Spline)
       surface definition to describe the shape of a NURBS surface (before any
       trimming). To mark the beginning of a NURBS surface definition, use the
       gluBeginSurface() command. To mark the end of a NURBS surface
       definition, use the gluEndSurface() command. Call gluNurbsSurface
       within a NURBS surface definition only.

       Positional, texture, and color coordinates are associated with a
       surface by presenting each as a separate gluNurbsSurface between a
       gluBeginSurface()/gluEndSurface() pair. No more than one call to
       gluNurbsSurface for each of color, position, and texture data can be
       made within a single gluBeginSurface()/gluEndSurface() pair. Exactly
       one call must be made to describe the position of the surface (a type
       of GLU_MAP2_VERTEX_3 or GLU_MAP2_VERTEX_4).

       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) times (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()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		   GLUNURBSSURFACE(3G)

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