ription</h2>
        <p>
            In a scene composed entirely of opaque closed surfaces,
            back-facing polygons are never visible.
            Eliminating these invisible polygons has the obvious benefit
            of speeding up the rendering of the image.
            To enable and disable elimination of back-facing polygons, call <a class="citerefentry" href="glEnable"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
            and <a class="citerefentry" h