_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(PwlCurve, describe a piecewise linear NURBS trimming curve) _names(PwlCurve) .EQ delim $$ .EN .SH PARAMETERS _phead(_param1) Specifies the NURBS object (created with _cmnd(NewNurbsRenderer)). _phead(_param2) Specifies the number of points on the curve. _phead(_param3) Specifies an array containing the curve points. _phead(_param4) Specifies the offset (a number of single-precision floating-point values) between points on the curve. _phead(_param5) Specifies the type of curve. Must be either _gluconst(MAP1_TRIM_2) or _gluconst(MAP1_TRIM_3). .SH DESCRIPTION _cmnd describes a piecewise linear trimming curve for a NURBS surface. A piecewise linear curve consists of a list of coordinates of points in the parameter space for the NURBS surface to be trimmed. These points are connected with line segments to form a curve. If the curve is an approximation to a curve that is not piecewise linear, the points should be close enough in parameter space that the resulting path appears curved at the resolution used in the application. .P If _param5 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 information about trimming curves. .SH NOTES To describe a trim curve that closely follows the contours of a NURBS surface, call _cmnd(NurbsCurve). .SH SEE ALSO _cmnd(BeginCurve), _cmnd(BeginTrim), _cmnd(NewNurbsRenderer), _cmnd(NurbsCurve)