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_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)