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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(BeginTrim, delimit a NURBS trimming loop definition)
-_names(BeginTrim)
-_names(EndTrim,,noheader)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the NURBS object (created with _cmnd(NewNurbsRenderer)).
-.SH DESCRIPTION
-Use _cmnd(BeginTrim) to mark the beginning of a
-trimming loop, and _cmnd(EndTrim) to mark the end 
-of a trimming loop. A trimming loop is 
-a set of oriented curve segments (forming a closed curve) that
-define boundaries of a NURBS surface. You include these
-trimming loops in the definition of a NURBS 
-surface, between calls to _cmnd(BeginSurface) and _cmnd(EndSurface).
-.P
-The definition for a NURBS surface can contain many
-trimming loops. For example, if you wrote a definition
-for a NURBS surface that resembled a rectangle with
-a hole punched out, the definition would contain two 
-trimming loops. One loop would define the outer edge
-of the rectangle; the other would define
-the hole punched out of the rectangle. The definitions
-of each of these trimming loops would be bracketed by a
-_cmnd(BeginTrim)/_cmnd(EndTrim) pair.
-.P
-The definition of a single closed trimming loop can consist
-of multiple curve segments, each described as a piecewise
-linear curve (see _cmnd(PwlCurve)) or as a single NURBS
-curve (see _cmnd(NurbsCurve)), or as a combination of 
-both in any order. The only library calls that can 
-appear in a trimming loop definition (between the calls
-to _cmnd(BeginTrim) and _cmnd(EndTrim)) are 
-_cmnd(PwlCurve) and _cmnd(NurbsCurve).
-.P
-The area of the NURBS surface that is displayed is the
-region in the domain to the left of the trimming curve
-as the curve parameter increases. Thus, the retained
-region of the NURBS surface is inside a 
-counterclockwise trimming loop and outside a clockwise
-trimming loop. For the rectangle mentioned earlier,
-the trimming loop for the outer edge of the rectangle runs
-counterclockwise, while the trimming loop for the punched-out hole 
-runs clockwise.
-.P
-If you use more than one curve to define a single trimming 
-loop, the curve segments must form a closed loop (that is,
-the endpoint of each curve must be the starting point of the
-next curve, and the endpoint of the final curve must
-be the starting point of the first curve). If the 
-endpoints of the curve are sufficiently close together
-but not exactly coincident, they will be coerced to match.
-If the endpoints are not sufficiently close, an error results
-(see _cmnd(NurbsCallback)).
-.P
-If a trimming loop definition contains multiple curves,
-the direction of the curves must be consistent (that is, the
-inside must be to the left of all of the curves). Nested
-trimming loops are legal as long as the curve orientations
-alternate correctly.
-If trimming curves are self-intersecting,
-or intersect one another, an error results.
-.P
-If no trimming information is given
-for a NURBS surface, the entire surface is drawn.
-.SH EXAMPLE
-This code fragment defines a trimming loop that consists of one
-piecewise linear curve, and two NURBS curves:
-.sp
-.Ex
-gluBeginTrim(nobj);
-   gluPwlCurve(..., GLU_MAP1_TRIM_2);
-   gluNurbsCurve(..., GLU_MAP1_TRIM_2);
-   gluNurbsCurve(..., GLU_MAP1_TRIM_3);
-gluEndTrim(nobj);
-.Ee
-.SH SEE ALSO
-_cmnd(BeginSurface), _cmnd(NewNurbsRenderer), _cmnd(NurbsCallback), 
-_cmnd(NurbsCurve), _cmnd(PwlCurve)
-
-