GLUPWLCURVE() MachTen Programmer’s Manual GLUPWLCURVE()

NAME
gluPwlCurve - describe a piecewise linear NURBS trimming
curve

C SPECIFICATION
void gluPwlCurve( GLUnurbs* nurb,
GLint count,
GLfloat* data,
GLint stride,
GLenum type )

delim $$

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 con-
nected 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.

SEE ALSO
gluBeginCurve, gluBeginTrim, gluNewNurbsRenderer, gluNurb-
sCurve

MachTen 1