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GLUBEGINSURFACE(3G)		 OpenGL Manual		   GLUBEGINSURFACE(3G)

NAME
       gluBeginSurface - delimit a NURBS surface definition

C SPECIFICATION
       void gluBeginSurface(GLUnurbs* nurb);

C SPECIFICATION
       void gluEndSurface(GLUnurbs* nurb);

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

DESCRIPTION
       Use gluBeginSurface to mark the beginning of a NURBS surface
       definition. After calling gluBeginSurface, make one or more calls to
       gluNurbsSurface() to define the attributes of the surface. Exactly one
       of these calls to gluNurbsSurface() must have a surface type of
       GLU_MAP2_VERTEX_3 or GLU_MAP2_VERTEX_4. To mark the end of the NURBS
       surface definition, call gluEndSurface().

       Trimming of NURBS surfaces is supported with gluBeginTrim(),
       gluPwlCurve(), gluNurbsCurve(), and gluEndTrim(). See the
       gluBeginTrim() reference page for details.

       GL evaluators are used to render the NURBS surface as a set of
       polygons. Evaluator state is preserved during rendering with
       glPushAttrib()(GLU_EVAL_BIT) and glPopAttrib(). See the glPushAttrib()
       reference page for details on exactly what state these calls preserve.

EXAMPLE
       The following commands render a textured NURBS surface with normals;
       the texture coordinates and normals are also described as 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
       gluBeginCurve(), gluBeginTrim(), gluNewNurbsRenderer(),
       gluNurbsCurve(), gluNurbsSurface(), gluPwlCurve(), glPushAttrib()

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		   GLUBEGINSURFACE(3G)

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