gluBeginSurface, gluEndSurface: delimit a NURBS surface
C Specification |
Use gluBeginSurface to mark the beginning of a NURBS surface
definition. After calling gluBeginSurface, make one or more calls to
gluNurbsSurface to define the
attributes of the surface. Exactly one of these calls to gluNurbsSurface must have a surface
type of GL_MAP2_VERTEX_3 or
GL_MAP2_VERTEX_4. To mark the end of the NURBS surface
definition, call gluEndSurface.
- Specifies the NURBS object (created with gluNewNurbsRenderer).
Trimming of NURBS surfaces is supported with gluBeginTrim, gluPwlCurve, gluNurbsCurve, and gluEndTrim. See the gluBeginTrim reference page for details.
GL evaluators are used to render the NURBS surface as a set of polygons.
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.