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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 (C) 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				    06/10/2014			      GLUBEGINSURFACE(3G)
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