gluBeginCurve

gluBeginCurve, gluEndCurve: delimit a NURBS curve definition.

C Specification | Parameters | Description | See Also

C Specification

void gluBeginCurve(
    GLUnurbs*	 nurb)
void gluEndCurve(
    GLUnurbs*	 nurb)

Parameters

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.