## Name

gluPwlCurve — describe a piecewise linear NURBS trimming curve

## C Specification

`void `**gluPwlCurve**( | GLUnurbs* `nurb`, |

| GLint `count`, |

| GLfloat* `data`, |

| GLint `stride`, |

| GLenum `type``)` ; |

## Parameters

`nurb`

Specifies the NURBS object (created with gluNewNurbsRenderer).

`count`

Specifies the number of points on the curve.

`data`

Specifies an array containing the curve points.

`stride`

Specifies the offset (a number of single-precision floating-point values)
between points on the curve.

`type`

Specifies the type of curve.
Must be either `GLU_MAP1_TRIM_2`

or `GLU_MAP1_TRIM_3`

.

## Description

`gluPwlCurve`

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.

If `type`

is
`GLU_MAP1_TRIM_2`

, then it describes a curve in two-dimensional (*u*
and *v*) parameter space. If it is `GLU_MAP1_TRIM_3`

, then it
describes a curve in two-dimensional homogeneous (*u*, *v*,
and *w*) parameter space.
See the gluBeginTrim reference page for more information
about trimming curves.

## Notes

To describe a trim curve that closely follows the contours of a NURBS
surface, call gluNurbsCurve.

## Copyright

Copyright © 1991-2006
Silicon Graphics, Inc. This document is licensed under the SGI
Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.