fgluPwlCurve(3G) OpenGL Reference fgluPwlCurve(3G)NAME
fgluPwlCurve - describe a piecewise linear NURBS trimming curve
FORTRAN SPECIFICATION
SUBROUTINE fgluPwlCurve( CHARACTER*8 nurb,
INTEGER*4 count,
CHARACTER*8 data,
INTEGER*4 stride,
INTEGER*4 type )
PARAMETERS
nurb Specifies the NURBS object (created with fgluNewNurbsRenderer).
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
fgluPwlCurve 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 fgluBeginTrim reference page for more information about trimming
curves.
NOTES
To describe a trim curve that closely follows the contours of a NURBS
surface, call fgluNurbsCurve.
SEE ALSO
fgluBeginCurve, fgluBeginTrim, fgluNewNurbsRenderer, fgluNurbsCurve
Page 1
