  This reduces the available precision. </li>
    <li>You use single precision arithmetic (<a href="http://www.qhull.org/src/libqhull_r/user_r.h#realT">realT</a>).
    </li>
    <li>You want to set additional options for approximating the
        hull. </li>
</ul>

<p>Use joggled input ('<a href="qh-optq.htm#QJn">QJ</a>') if </p>

<ul>
    <li>Your application needs clearly convex, simplicial output</li>
    <li>Your application supports perturbed input points and narrow triangles.</li>
    <li>Seven signif