gluTessBeginContour — delimit a contour description
Specifies the tessellation object (created with gluNewTess).
gluTessBeginContour and gluTessEndContour delimit the definition of a
polygon contour. Within each
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.
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