gluBeginCurve, gluEndCurve: delimit a NURBS curve
C Specification |
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.
- Specifies the NURBS object (created with gluNewNurbsRenderer).
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.