gluBeginCurve(3) gluBeginCurve(3)
NAME
gluBeginCurve, gluEndCurve - delimit a NURBS curve definition
C SPECIFICATION
void gluBeginCurve( GLUnurbs* nurb )
void gluEndCurve( GLUnurbs* nurb )
PARAMETERS
nurb Specifies the NURBS object (created with gluNewNurbsRenderer).
DESCRIPTION
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 ref-
erence page for details on exactly what state these calls preserve.
EXAMPLE
The following commands render a textured NURBS curve with normals; tex-
ture 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);
SEE ALSO
gluBeginSurface(3), gluBeginTrim(3), gluNewNurbsRenderer(3),
gluNurbsCurve(3), glPopAttrib(3), glPushAttrib(3)
gluBeginCurve(3)
Mac OS X 10.6 - Generated Thu Sep 17 20:20:31 CDT 2009