</span></span></a>.
            The vertices specify a closed contour (the last vertex of each contour
            is automatically linked to the first). See the <a class="citerefentry" href="gluTessVertex"><span class="citerefentry"><span class="refentrytitle">gluTessVertex</span></span></a>,
            <a class="citerefentry" href="gluTessBeginContour"><span class="citerefentry"><span class="refentrytitle">gluTessBeginContour</span></span></a>, and <a class="citerefentry" href="gluTessEndContour"><span c