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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(TessVertex, specify a vertex on a polygon)
-_names(TessVertex)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the tessellation object (created with _cmnd(NewTess)).
-_phead(_param2)
-Specifies the location of the vertex.
-_phead(_param3)
-Specifies an opaque pointer passed back to the program with the vertex callback
-(as specified by _cmnd(TessCallback)).
-.SH DESCRIPTION
-_cmnd describes a vertex on a polygon that the program defines. Successive
-_cmnd calls describe a closed contour. For example, 
-to describe a quadrilateral _cmnd should be called four times.
-_cmnd can only be called between _cmnd(TessBeginContour) and 
-_cmnd(TessEndContour).
-.P
-_param3 normally points to a structure containing the vertex
-location, as well as other per-vertex attributes such as color and normal.
-This pointer is passed back to the user through the _gluconst(TESS_VERTEX)
-or _gluconst(TESS_VERTEX_DATA) callback after tessellation 
-(see the _cmnd(TessCallback) reference page).
-.SH EXAMPLE
-A quadrilateral with a triangular hole in it can be described as follows:
-.sp
-.Ex
-gluTessBeginPolygon(tobj, NULL);
- gluTessBeginContour(tobj);
-   gluTessVertex(tobj, v1, v1);
-   gluTessVertex(tobj, v2, v2);
-   gluTessVertex(tobj, v3, v3);
-   gluTessVertex(tobj, v4, v4);
- gluTessEndContour(tobj);
- gluTessBeginContour(tobj);
-   gluTessVertex(tobj, v5, v5);
-   gluTessVertex(tobj, v6, v6);
-   gluTessVertex(tobj, v7, v7);
- gluTessEndContour(tobj);
-gluTessEndPolygon(tobj);
-.Ee
-.sp
-.SH NOTES
-It is a common error to use a local variable for _param2 or _param3 and store
-values into it as part of a loop.
-For example:
-.Ex
-for (i = 0; i < NVERTICES; ++i) {
-  GLdouble data[3];
-  data[0] = vertex[i][0];
-  data[1] = vertex[i][1];
-  data[2] = vertex[i][2];
-  gluTessVertex(tobj, data, data);
-  }
-.Ee
-.P
-This doesn't work.
-Because the pointers specified by _param2 and _param3 might not be 
-dereferenced until _cmnd(TessEndPolygon) is executed,
-all the vertex coordinates but the very last set could be overwritten
-before tessellation begins.
-.P
-Two common symptoms of this problem are consists of a single point
-(when a local variable is used for _param3) and a
-_gluconst(TESS_NEED_COMBINE_CALLBACK) error (when a local variable is
-used for _param2).
-.SH SEE ALSO
-_cmnd(TessBeginPolygon), _cmnd(NewTess), _cmnd(TessBeginContour), 
-_cmnd(TessCallback), 
-_cmnd(TessProperty), _cmnd(TessNormal),
-_cmnd(TessEndPolygon)
-
-