Signature
Parameters
| Variables | Description |
|---|---|
| nurb |
Specifies the NURBS object (created with
gluNewNurbsRenderer
).
|
Description
Use
gluBeginSurface
to mark the beginning of a NURBS
surface definition. After
calling
gluBeginSurface
, make one or more calls to
gluNurbsSurface
to define the attributes of the surface.
Exactly one of these calls to
gluNurbsSurface
must have a
surface type of
GLU_MAP2_VERTEX_3
or
GLU_MAP2_VERTEX_4
.
To mark the end of the NURBS surface definition, call
gluEndSurface
.
Trimming of NURBS surfaces is supported with
gluBeginTrim
,
gluPwlCurve
,
gluNurbsCurve
, and
gluEndTrim
. See the
gluBeginTrim
reference page for details.
GL evaluators are used to render the NURBS surface as a set of polygons.
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 surface with normals;
the texture coordinates and normals are also described as NURBS surfaces:
gluBeginSurface(nobj);
gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4);
gluEndSurface(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.
gluBeginSurface
gluEndSurface