fglubegincurve.html

来自「计算机图形学～想必是很多人需要的～在此共享一下」· HTML 代码 · 共 59 行

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<HTML><BODY><PRE>     <STRONG>NAME</STRONG>	  <STRONG>fgluBeginCurve,</STRONG> <STRONG>fgluEndCurve</STRONG> - delimit a NURBS curve	  definition     <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG>	  SUBROUTINE <STRONG>fgluBeginCurve</STRONG>( CHARACTER*8 <EM>nurb</EM> )	  SUBROUTINE <STRONG>fgluEndCurve</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>fgluBeginCurve</STRONG> to	mark the beginning of a	NURBS curve	  definition.  After calling <STRONG>fgluBeginCurve</STRONG>, make one or more	  calls	to <STRONG>fgluNurbsCurve</STRONG> to define the	attributes of the	  curve.  Exactly one of the calls to <STRONG>fgluNurbsCurve</STRONG> must have	  a curve type of <STRONG>GL_MAP1_VERTEX_3</STRONG> or <STRONG>GL_MAP1_VERTEX_4</STRONG>.	 To	  mark the end of the NURBS curve definition, call	  <STRONG>fgluEndCurve</STRONG>.	  GL evaluators	are used to render the NURBS curve as a	series	  of line segments.  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 curve with	  normals; texture coordinates and normals are also specified	  as NURBS curves:	  gluBeginCurve(nobj);	     gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);	     gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);	     gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);	  gluEndCurve(nobj);     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>	  <STRONG>fgluBeginSurface</STRONG>, <STRONG>fgluBeginTrim</STRONG>, <STRONG>fgluNewNurbsRenderer</STRONG>,	  <STRONG>fgluNurbsCurve</STRONG>, <STRONG>glPopAttrib</STRONG>, <STRONG>glPushAttrib</STRONG></PRE></BODY></HTML>

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