delimit a NURBS curve definition
void gluBeginCurve( | GLUnurbs* | nurb); |
void gluEndCurve( | GLUnurbs* | nurb); |
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 GLU_MAP1_VERTEX_3 or GLU_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(GLU_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, gluBeginTrim, gluNewNurbsRenderer, gluNurbsCurve, glPopAttrib, glPushAttrib
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