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+_C_ License Applicability. Except to the extent portions of this file are
+_C_ made subject to an alternative license as permitted in the SGI Free
+_C_ Software License B, Version 1.1 (the "License"), the contents of this
+_C_ file are subject only to the provisions of the License. You may not use
+_C_ this file except in compliance with the License. You may obtain a copy
+_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+_C_ 
+_C_ http://oss.sgi.com/projects/FreeB
+_C_ 
+_C_ Note that, as provided in the License, the Software is distributed on an
+_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+_C_ 
+_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
+_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+_C_ Copyright in any portions created by third parties is as indicated
+_C_ elsewhere herein. All Rights Reserved.
+_C_ 
+_C_ Additional Notice Provisions: The application programming interfaces
+_C_ established by SGI in conjunction with the Original Code are The
+_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
+_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
+_C_ published by SGI, but has not been independently verified as being
+_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
+_C_
+_C_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
+_C_ The first character in this file must be an '_'!
+_C_ Anything on a line after _C_ is ignored
+_define(_filters,eqn)_C_
+_C_      eqn is automatically replaced with neqn for nroff
+_header(BeginSurface, delimit a NURBS surface definition)
+_names(BeginSurface)
+_names(EndSurface,,noheader)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1)
+Specifies the NURBS object (created with _cmnd(NewNurbsRenderer)).
+.SH DESCRIPTION
+Use _cmnd(BeginSurface) to mark the beginning of a NURBS 
+surface definition. After 
+calling _cmnd(BeginSurface), make one or more calls to
+_cmnd(NurbsSurface) to define the attributes of the surface.
+Exactly one of these calls to _cmnd(NurbsSurface) must have a
+surface type of _const(MAP2_VERTEX_3) or _const(MAP2_VERTEX_4).
+To mark the end of the NURBS surface definition, call
+_cmnd(EndSurface).
+.P
+Trimming of NURBS surfaces is supported with _cmnd(BeginTrim), 
+_cmnd(PwlCurve), _cmnd(NurbsCurve), and _cmnd(EndTrim). See the
+_cmnd(BeginTrim) reference page for details.
+.P
+GL evaluators are used to render the NURBS surface as a set of polygons.
+Evaluator state is preserved during rendering
+with _glcmnd(PushAttrib)(_const(EVAL_BIT)) and 
+_glcmnd(PopAttrib)().  
+See the _glcmnd(PushAttrib) reference page for details on exactly what state
+these calls preserve.
+.SH EXAMPLE
+The following commands render a textured NURBS surface with normals;
+the texture coordinates and normals are also described as NURBS surfaces:
+.sp
+.Ex
+gluBeginSurface(nobj);
+   gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
+   gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
+   gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4);
+gluEndSurface(nobj);
+.Ee
+.sp
+.SH SEE ALSO
+_cmnd(BeginCurve), _cmnd(BeginTrim), _cmnd(NewNurbsRenderer), 
+_cmnd(NurbsCurve), _cmnd(NurbsSurface), _cmnd(PwlCurve)
+
+
+