GLUBEGINSURFACE - Online Linux Manual PageSection : 3G

NAME"gluBeginSurface, gluEndSurface − delimit a NURBS surface definition

C SPECIFICATIONvoid gluBeginSurface( GLUnurbs* nurb ) void gluEndSurface( GLUnurbs* nurb )

PARAMETERSnurb  Specifies the NURBS object (created with ­gluNewNurbsRenderer).

DESCRIPTIONUse ­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. 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.

EXAMPLEThe following commands render a textured NURBS surface with normals; the texture coordinates and normals are also described as NURBS surfaces:
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