Delimits a Non-Uniform Rational B-Spline (NURBS) curve definition.
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.
OpenGL evaluators are used to render the NURBS curve as a series of line segments. Evaluator state is preserved during rendering with Gl.glPushAttrib(Gl.GL_EVAL_BIT)
and Gl.glPopAttrib
. For information on exactly what state these calls preserve, see glPushAttrib.
EXAMPLE
The following commands render a textured NURBS curve with normals; texture coordinates and normals are also specified as NURBS curves:
Glu.gluBeginCurve(nobj); Glu.gluNurbsCurve(nobj, ..., Gl.GL_MAP1_TEXTURE_COORD_2); Glu.gluNurbsCurve(nobj, ..., Gl.GL_MAP1_NORMAL); Glu.gluNurbsCurve(nobj, ..., Gl.GL_MAP1_VERTEX_4); Glu.gluEndCurve(nobj);
Glu Class | Tao.OpenGl Namespace | glPopAttrib | glPushAttrib | gluBeginSurface | gluBeginTrim | gluNewNurbsRenderer | gluNurbsCurve