GLenum type )

PARAMETERS
       tess  Specifies the tessellation object (created with gluNewTess).

       type  Specifies  the type of the contour being defined. Valid values are
             GLU_EXTERIOR, 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  previous
       contour  is  complete  and that the next contour is about to begin.  An‐
       other series of gluTessVertex calls is then used  to  describe  the  new
       contour.  This  process can be repeated until all contours have been de‐
       scribed.

       type defines what type of contour follows.  The legal contour types  are
       as follows:

       GLU_EXTERIOR      An  exterior  contour  defines an exterior boundary of
                         the polygon.

       GLU_INTERIOR      An interior contour defines an  interior  boundary  of
                         the polygon (such as a hole).

       GLU_UNKNOWN       An  unknown  contour is analyzed by the library to de‐
                         termine if it is interior or exterior.

       GLU_CCW,

       GLU_CW            The first GLU_CCW or GLU_CW contour defined is consid‐
                         ered to be exterior. All other contours are considered
                         to be exterior if they are oriented in the same direc‐
                         tion (clockwise or counterclockwise) as the first con‐
                         tour, 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       This  command  is  obsolete  and  is provided for backward compatibility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  followed
       by gluTessBeginContour.

       gluBeginPolygon,     gluNewTess,     gluTessCallback,     gluTessVertex,
       gluTessBeginContour

                                                             GLUNEXTCONTOUR(3G)