Javadoc
gluTessEndContour and
#gluTessBeginContourdelimit the definition of a polygon contour. Within each
#gluTessBeginContour/
gluTessEndContour pair, there can be zero or more calls to
#gluTessVertex. The vertices
specify a closed contour (the last vertex of each contour is automatically
linked to the first). See the
#gluTessVertex reference page for more details.
#gluTessBeginContour can
only be called between
#gluTessBeginPolygon and
#gluTessEndPolygon.
Optional, throws GLException if not available in profile