facets</a></li>
    <li><a href="#exact">Exact arithmetic</a></li>
    <li><a href="#approximate">Approximating a convex hull</a></li>
</ul>

<hr>

<h2><a href="#TOC">&#187;</a><a name="prec">Precision problems</a></h2>

<p>Since Qhull uses floating point arithmetic, roundoff error
occurs with each calculation. This causes problems for
geometric algorithms. Other floating point codes for convex
hulls, Delaunay triangulations, and Voronoi diagrams also suffer
from these problems.  Qhull handles most of them.