Table of Contents
gluBeginCurve, gluEndCurve - delimit a NURBS curve definition
void gluBeginCurve( GLUnurbs* nurb )
void gluEndCurve( GLUnurbs* nurb )
eqn not supported
- nurb
- Specifies the NURBS object (created with
gluNewNurbsRenderer).
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 GL_MAP1_VERTEX_3
or GL_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(GL_EVAL_BIT)
and glPopAttrib(). See the glPushAttrib reference page for details on
exactly what state these calls preserve.
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)
;
gluBeginSurface(3G)
, gluBeginTrim(3G)
, gluNewNurbsRenderer(3G)
,
gluNurbsCurve(3G)
, glPopAttrib(3G)
, glPushAttrib(3G)
Table of Contents