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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(NurbsSurface, define the shape of a NURBS surface)
+_names(NurbsSurface)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1)
+Specifies the NURBS object (created with _cmnd(NewNurbsRenderer)).
+_phead(_param2)
+Specifies the number of knots in the parametric \f2u\fP direction.
+_phead(_param3)
+Specifies an array of _param2 nondecreasing knot values in the parametric
+\f2u\fP direction.
+_phead(_param4)
+Specifies the number of knots in the parametric \f2v\fP direction.
+_phead(_param5)
+Specifies an array of _param4 nondecreasing knot values in the parametric
+\f2v\fP direction.
+_phead(_param6)
+Specifies the offset (as a number of single-precision floating point values)
+between successive control points in the parametric \f2u\fP direction
+in _param8.
+_phead(_param7)
+Specifies the offset (in single-precision floating-point values)
+between successive control points in the parametric \f2v\fP direction
+in _param8.
+_phead(_param8)
+Specifies an array containing control points for the NURBS surface.
+The offsets between successive control points in the parametric \f2u\fP
+and \f2v\fP directions are given by _param6 and _param7.
+_phead(_param9)
+Specifies the order of the NURBS surface in the parametric \f2u\fP 
+direction. The order is one more than the degree, hence
+a surface that is cubic in \f2u\fP has a \f2u\fP order of 4.
+_phead(_param10)
+Specifies the order of the NURBS surface in the parametric \f2v\fP 
+direction. The order is one more than the degree, hence
+a surface that is cubic in \f2v\fP has a \f2v\fP order of 4.
+_phead(_param11)
+Specifies type of the surface. _param11 can be any of the valid
+two-dimensional evaluator types (such as _const(MAP2_VERTEX_3) or 
+_const(MAP2_COLOR_4)).
+.SH DESCRIPTION
+Use _cmnd 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 _cmnd(BeginSurface) command.
+To mark the end of a NURBS surface definition, use the 
+_cmnd(EndSurface) command. Call _cmnd within a NURBS
+surface definition only.
+.P
+Positional, texture, and color coordinates are associated
+with a surface by presenting each as a separate _cmnd between a 
+_cmnd(BeginSurface)/_cmnd(EndSurface) pair. No more than
+one call to _cmnd for each of color, position, and texture
+data can be made within a single _cmnd(BeginSurface)/_cmnd(EndSurface)
+pair. Exactly one call must be made to describe the position of the 
+surface (a _param11 of _const(MAP2_VERTEX_3) or _const(MAP2_VERTEX_4)).
+.P
+A NURBS surface can be trimmed by using the commands 
+_cmnd(NurbsCurve) and _cmnd(PwlCurve) between calls to
+_cmnd(BeginTrim) and _cmnd(EndTrim).
+.P
+Note that a _cmnd with _param2 knots in the \f2u\fP direction
+and _param4 knots in the \f2v\fP direction with orders 
+_param9 and _param10 must have 
+(_param2 - _param9) $times$ (_param4 - _param10) control points.
+.SH EXAMPLE
+The following commands render a textured NURBS surface with normals;
+the texture coordinates and normals are also 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(BeginSurface), _cmnd(BeginTrim), _cmnd(NewNurbsRenderer), 
+_cmnd(NurbsCurve),
+_cmnd(PwlCurve)
+