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GLUBEGINSURFACE(3G)					   GLUBEGINSURFACE(3G)

NAME
       gluBeginSurface, gluEndSurface - delimit a NURBS surface definition

C SPECIFICATION
       void gluBeginSurface( GLUnurbs* nurb )

       void gluEndSurface( GLUnurbs* nurb )

PARAMETERS
       nurb  Specifies the NURBS object (created with gluNewNurbsRenderer).

DESCRIPTION
       Use  gluBeginSurface  to	 mark the beginning of a NURBS surface defini‐
       tion.  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	 poly‐
       gons.	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 surface with normals;
       the texture coordinates and normals are also described  as  NURBS  sur‐
       faces:

       gluBeginSurface(nobj);
	  gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
	  gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
	  gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4); gluEndSurface(nobj);

SEE ALSO
       gluBeginCurve(3G),      gluBeginTrim(3G),      gluNewNurbsRenderer(3G),
       gluNurbsCurve(3G), gluNurbsSurface(3G), gluPwlCurve(3G)

							   GLUBEGINSURFACE(3G)
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