Section: Misc. Reference Manual Pages (3G)
- delimit a NURBS surface definition
GLUnurbs* nurb )
Specifies the NURBS object (created with gluNewNurbsRenderer).
to mark the beginning of a NURBS
surface definition. After
, make one or more calls to
to define the attributes of the surface.
Exactly one of these calls to gluNurbsSurface
must have a
surface type of GL_MAP2_VERTEX_3
To mark the end of the NURBS surface definition, call
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(GL_EVAL_BIT) and
See the glPushAttrib reference page for details on exactly what state
these calls preserve.
The following commands render a textured NURBS surface with normals;
the texture coordinates and normals are also described as NURBS surfaces:
gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4);