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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>fgluBeginSurface,</STRONG> <STRONG>fgluEndSurface</STRONG> - delimit a NURBS surface	  definition     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fgluBeginSurface</STRONG>( CHARACTER*8 <EM>nurb</EM>	)	  SUBROUTINE <STRONG>fgluEndSurface</STRONG>( CHARACTER*8 <EM>nurb</EM> )     <STRONG>PARAMETERS</STRONG>	  <EM>nurb</EM>	Specifies the NURBS object (created with		<STRONG>fgluNewNurbsRenderer</STRONG>).     <STRONG>DESCRIPTION</STRONG>	  Use <STRONG>fgluBeginSurface</STRONG> to mark the beginning of	a NURBS	  surface definition. After calling <STRONG>fgluBeginSurface</STRONG>, make one	  or more calls	to <STRONG>fgluNurbsSurface</STRONG> to define the attributes	  of the surface.  Exactly one of these	calls to	  <STRONG>fgluNurbsSurface</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>fgluEndSurface</STRONG>.	  Trimming of NURBS surfaces is	supported with <STRONG>fgluBeginTrim</STRONG>,	  <STRONG>fgluPwlCurve</STRONG>,	<STRONG>fgluNurbsCurve</STRONG>,	and <STRONG>fgluEndTrim</STRONG>. See the	  <STRONG>fgluBeginTrim</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>fgluBeginCurve</STRONG>, <STRONG>fgluBeginTrim</STRONG>, <STRONG>fgluNewNurbsRenderer</STRONG>,	  <STRONG>fgluNurbsCurve</STRONG>, <STRONG>fgluNurbsSurface</STRONG>, <STRONG>fgluPwlCurve</STRONG></PRE></BODY></HTML>

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