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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>gluBeginSurface,</STRONG> <STRONG>gluEndSurface</STRONG> - delimit a NURBS surface	  definition     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>	  void <STRONG>gluBeginSurface</STRONG>(	GLUnurbs* <EM>nurb</EM> )	  void <STRONG>gluEndSurface</STRONG>( GLUnurbs*	<EM>nurb</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>nurb</EM>	Specifies the NURBS object (created with		<STRONG>gluNewNurbsRenderer</STRONG>).     <STRONG>DESCRIPTION</STRONG>	  Use <STRONG>gluBeginSurface</STRONG> to mark the beginning of a NURBS surface	  definition. After calling <STRONG>gluBeginSurface</STRONG>, make one or more	  calls	to <STRONG>gluNurbsSurface</STRONG> to define the attributes of the	  surface.  Exactly one	of these calls to <STRONG>gluNurbsSurface</STRONG> must	  have a surface type of <STRONG>GL_MAP2_VERTEX_3</STRONG> or <STRONG>GL_MAP2_VERTEX_4</STRONG>.	  To mark the end of the NURBS surface definition, call	  <STRONG>gluEndSurface</STRONG>.	  Trimming of NURBS surfaces is	supported with <STRONG>gluBeginTrim</STRONG>,	  <STRONG>gluPwlCurve</STRONG>, <STRONG>gluNurbsCurve</STRONG>, and <STRONG>gluEndTrim</STRONG>. See the	  <STRONG>gluBeginTrim</STRONG> 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 <STRONG>glPushAttrib</STRONG>(<STRONG>GL_EVAL_BIT</STRONG>) and <STRONG>glPopAttrib</STRONG>(). See	the	  <STRONG>glPushAttrib</STRONG> reference page for details on exactly what	  state	these calls preserve.     <STRONG>EXAMPLE</STRONG>	  The following	commands render	a textured NURBS surface with	  normals; the texture coordinates and normals are also	  described as NURBS surfaces:	  gluBeginSurface(nobj);	     gluNurbsSurface(nobj, ...,	GL_MAP2_TEXTURE_COORD_2);	     gluNurbsSurface(nobj, ...,	GL_MAP2_NORMAL);	     gluNurbsSurface(nobj, ...,	GL_MAP2_VERTEX_4);	  gluEndSurface(nobj);     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>gluBeginCurve</STRONG>, <STRONG>gluBeginTrim</STRONG>, <STRONG>gluNewNurbsRenderer</STRONG>,	  <STRONG>gluNurbsCurve</STRONG>, <STRONG>gluNurbsSurface</STRONG>, <STRONG>gluPwlCurve</STRONG></PRE></BODY></HTML>

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