Signature
Parameters
| Variables | Description |
|---|---|
| nurb |
Specifies the NURBS object (created with
gluNewNurbsRenderer
).
|
Description
Use
gluBeginCurve
to mark the beginning of a NURBS
curve definition.
After
calling
gluBeginCurve
, make one or more calls to
gluNurbsCurve
to define the attributes of the curve.
Exactly one of the calls to
gluNurbsCurve
must have
a curve type of
GLU_MAP1_VERTEX_3
or
GLU_MAP1_VERTEX_4
.
To mark the end of the NURBS curve definition, call
gluEndCurve
.
GL evaluators are used to render the NURBS curve as a series of line
segments.
Evaluator state is preserved during rendering
with
glPushAttrib
(
GLU_EVAL_BIT
) and
glPopAttrib
().
See the
glPushAttrib
reference page for details on exactly what state
these calls preserve.
Example
The following commands render a textured NURBS curve with normals;
texture coordinates and normals are also specified as NURBS curves:
gluBeginCurve(nobj);
gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);
gluEndCurve(nobj);
See Also
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/
.
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.
gluBeginCurve
gluEndCurve