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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: 2001/03/19 17:45:27 $ $Revision: 1.1.1.1 $
-_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)
-