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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)
-
-
-