gluPwlCurve

describe a piecewise linear NURBS trimming curve

Signature

gluPwlCurve( GLUnurbs* ( nurb ) , GLint ( count ) , GLfloat* ( data ) , GLint ( stride ) , GLenum ( type ) )-> void
gluPwlCurve( nurb , count , data , stride , type ) 
gluPwlCurve -- piece-wise linear curve within GLU context

    data -- the data-array
    type -- determines number of elements/data-point

Parameters

VariablesDescription
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 .

See Also

gluBeginCurve , gluBeginTrim , gluNewNurbsRenderer , gluNurbsCurve

Sample Code References

The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.

gluPwlCurve
OpenGLContext OpenGLContext/scenegraph/nurbs.py Lines: 35
OpenGLContext tests/redbook_trim.py Lines: 112, 119
OpenGL-Demo PyOpenGL-Demo/proesch/nurbs/nurbs.py Lines: 122, 128

Copyright Notices

This documentation is based on documentation licensed under the SGI Free Software License B.