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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)
-