gluNextContour man page on DigitalUNIX

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gluNextContour()					      gluNextContour()

NAME
       gluNextContour - mark the beginning of another contour

SYNOPSIS
       void gluNextContour(
	       GLUtesselator* tess,
	       GLenum type );

PARAMETERS
       Specifies  the tessellation object (created with gluNewTess()).	Speci‐
       fies the type of the contour being defined. Valid values are  GLU_EXTE‐
       RIOR, GLU_INTERIOR, GLU_UNKNOWN, GLU_CCW, and GLU_CW.

DESCRIPTION
       gluNextContour() is used in describing polygons with multiple contours.
       After the  first	 contour  has  been  described	through	 a  series  of
       gluTessVertex()	calls, a gluNextContour() call indicates that the pre‐
       vious contour is complete and that the next contour is about to	begin.
       Another	series	of  gluTessVertex() calls is then used to describe the
       new contour. This process can be repeated until all contours have  been
       described.

       type defines what type of contour follows.  The legal contour types are
       as follows: An exterior contour defines an  exterior  boundary  of  the
       polygon.	 An interior contour defines an interior boundary of the poly‐
       gon (such as a hole).  An unknown contour is analyzed by the library to
       determine  if  it is interior or exterior.  The first GLU_CCW or GLU_CW
       contour defined is considered to be exterior. All  other	 contours  are
       considered  to  be  exterior if they are oriented in the same direction
       (clockwise or counterclockwise) as the first contour, and  interior  if
       they are not.

       If  one contour is of type GLU_CCW or GLU_CW, then all contours must be
       of the same type (if they are not, then all GLU_CCW and GLU_CW contours
       will be changed to GLU_UNKNOWN).

       Note  that  there  is no real difference between the GLU_CCW and GLU_CW
       contour types.

       Before the first contour is described, gluNextContour() can  be	called
       to  define  the	type  of the first contour. If gluNextContour() is not
       called before the first contour,	 then  the  first  contour  is	marked
       GLU_EXTERIOR.

       This  command  is  obsolete  and is provided for backward compatibility
       only. Calls to gluNextContour() are mapped to gluTessEndContour()  fol‐
       lowed by gluTessBeginContour().

EXAMPLE
       A  quadrilateral	 with a triangular hole in it can be described as fol‐
       lows: gluBeginPolygon(tobj); gluTessVertex(tobj, v1, v1);
	   gluTessVertex(tobj, v2, v2);
	   gluTessVertex(tobj, v3, v3);
	   gluTessVertex(tobj, v4, v4); gluNextContour(tobj, GLU_INTERIOR);
	   gluTessVertex(tobj, v5, v5);
	   gluTessVertex(tobj, v6, v6);
	   gluTessVertex(tobj, v7, v7); gluEndPolygon(tobj);

SEE ALSO
       gluBeginPolygon(3),  gluNewTess(3),   gluTessCallback(3),   gluTessVer‐
       tex(3), gluTessBeginContour(3)

							      gluNextContour()
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