gluPwlCurve

NAME

gluPwlCurve -- describe a piecewise linear NURBS trimming curve

C SPECIFICATION

void gluPwlCurve(GLUnurbsObj *nobj,

GLint count,

GLfloat *array,

GLint stride,

GLenum type)

PARAMETERS

nobj

Specifies the NURBS object (created with gluNewNurbsRenderer).

count

Specifies the number of points on the curve.

array

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 which 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. Please refer to the gluBeginTrim reference page for more information about trimming curves.

NOTES

To describe a trim curve which closely follows the contours of a NURBS surface use gluNurbsCurve.