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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(NurbsCurve, define the shape of a NURBS curve)
-_names(NurbsCurve)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the NURBS object (created with _cmnd(NewNurbsRenderer)).
-_phead(_param2)
-Specifies the number of knots in _param3.
-_param2 equals the number of control points plus the order.
-_phead(_param3)
-Specifies an array of _param2 nondecreasing knot values.
-_phead(_param4)
-Specifies the offset (as a number of single-precision floating-point values)
-between successive curve control points.
-_phead(_param5)
-Specifies a pointer to an array of control points. The coordinates must
-agree with _param7, specified below.
-_phead(_param6)
-Specifies the order of the NURBS curve. _param6 equals degree + 1, hence
-a cubic curve has an order of 4.
-_phead(_param7)
-Specifies the type of the curve. If this curve is defined within a 
-_cmnd(BeginCurve)/_cmnd(EndCurve) pair, then 
-the type can be any of the valid
-one-dimensional evaluator types (such as _const(MAP1_VERTEX_3) or 
-_const(MAP1_COLOR_4)). Between a _cmnd(BeginTrim)/_cmnd(EndTrim) pair,
-the only valid types are _gluconst(MAP1_TRIM_2) and _gluconst(MAP1_TRIM_3).
-.SH DESCRIPTION
-Use _cmnd to describe a NURBS curve.
-.P
-When _cmnd appears between a _cmnd(BeginCurve)/_cmnd(EndCurve) pair, it is 
-used to describe a curve to be rendered.
-Positional, texture, and color coordinates are associated
-by presenting each as a separate _cmnd between a 
-_cmnd(BeginCurve)/_cmnd(EndCurve) pair. No more than
-one call to _cmnd for each of color, position, and texture
-data can be made within a single _cmnd(BeginCurve)/_cmnd(EndCurve)
-pair. Exactly one call must be made to describe the position of the 
-curve (a _param7 of _const(MAP1_VERTEX_3) or _const(MAP1_VERTEX_4)).
-.P
-When _cmnd appears between a _cmnd(BeginTrim)/_cmnd(EndTrim) pair, it is 
-used to describe a trimming curve on a NURBS surface. If _param7 is
-_gluconst(MAP1_TRIM_2), then it describes a curve in two-dimensional (\f2u\fP 
-and \f2v\fP)
-parameter space. If it is _gluconst(MAP1_TRIM_3), then it describes a 
-curve in two-dimensional homogeneous (\f2u\fP, \f2v\fP, and \f2w\fP) 
-parameter space.
-See the _cmnd(BeginTrim) reference page for more discussion about trimming
-curves.
-.SH EXAMPLE
-The following commands render a textured NURBS curve with normals:
-.sp
-.Ex
-gluBeginCurve(nobj);
-   gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
-   gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
-   gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);
-gluEndCurve(nobj);
-.Ee
-.sp
-.SH NOTES
-To define trim curves which stitch well, use _cmnd(PwlCurve).
-.SH SEE ALSO
-_cmnd(BeginCurve), _cmnd(BeginTrim), _cmnd(NewNurbsRenderer), _cmnd(PwlCurve)
-