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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(NextContour, mark the beginning of another contour)
+_names(NextContour)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1)
+Specifies the tessellation object (created with _cmnd(NewTess)).
+_phead(_param2)
+Specifies the type of the contour being defined. Valid values are
+_gluconst(EXTERIOR),
+_gluconst(INTERIOR),
+_gluconst(UNKNOWN),
+_gluconst(CCW), and
+_gluconst(CW).
+.SH DESCRIPTION
+_cmnd is used in describing polygons with multiple contours. After the first
+contour has been described through a series of _cmnd(TessVertex) calls, 
+a _cmnd call indicates that the previous contour is complete and that the
+next contour is about to begin.
+Another series of _cmnd(TessVertex) calls is then used to describe the new 
+contour. This process can be repeated until all contours have been described.
+.P
+_param2 defines what type of contour follows.
+The legal contour types are as follows:
+.TP 18
+_gluconst(EXTERIOR)
+An exterior contour defines an exterior boundary of the polygon.
+.TP
+_gluconst(INTERIOR)
+An interior contour defines an interior boundary of the polygon (such as 
+a hole).
+.TP
+_gluconst(UNKNOWN)
+An unknown contour is analyzed by the library to determine if it is interior
+or exterior.
+.TP
+_gluconst(CCW), 
+.TP
+_gluconst(CW)
+The first _gluconst(CCW) or _gluconst(CW) contour defined is considered to 
+be exterior. All other contours are considered to be exterior if they 
+are oriented in the same direction (clockwise or counterclockwise) as 
+the first contour, and interior if they are not.
+.P
+If one contour is of type _gluconst(CCW) or _gluconst(CW), then all 
+contours must be of the same type (if they are not, then all _gluconst(CCW)
+and _gluconst(CW) contours will be changed to _gluconst(UNKNOWN)).
+.P
+Note that there is no real difference between the _gluconst(CCW) and 
+_gluconst(CW) contour types.
+.P
+Before the first contour is described, _cmnd can be called to 
+define the type of the first contour.
+If _cmnd is not called before the first contour, then the first contour is 
+marked _gluconst(EXTERIOR).
+.P
+This command is obsolete and is provided for backward compatibility
+only. Calls to _cmnd are mapped to _cmnd(TessEndContour)
+followed by 
+_cmnd(TessBeginContour).
+.SH EXAMPLE
+A quadrilateral with a triangular hole in it can be described as follows:
+.sp
+.Ex
+gluBeginPolygon(tobj);
+   gluTessVertex(tobj, v1, v1);
+   gluTessVertex(tobj, v2, v2);
+   gluTessVertex(tobj, v3, v3);
+   gluTessVertex(tobj, v4, v4);
+gluNextContour(tobj, GLU_INTERIOR);
+   gluTessVertex(tobj, v5, v5);
+   gluTessVertex(tobj, v6, v6);
+   gluTessVertex(tobj, v7, v7);
+gluEndPolygon(tobj);
+.Ee
+.SH SEE ALSO
+_cmnd(BeginPolygon), _cmnd(NewTess), _cmnd(TessCallback), _cmnd(TessVertex),
+_cmnd(TessBeginContour)
+