ion is the triangulation with empty
circumspheres. It has many useful properties and applications.
See the survey article by Aurenhammer [<a
href="index.html#aure91">'91</a>] and the detailed introduction
by O'Rourke [<a href="index.html#orou94">'94</a>]. </p>

<blockquote>
<dl>
    <dt><b>Example:</b> rbox r y c G0.1 D2 | qdelaunay <a href="qh-opto.html#s">s</a>
        <a href="qh-optf.html#Fv">Fv</a> <a href="qh-optt.html#TO">TO
        result</a></dt>
    <dd>Compute the 2-d Delaunay triangulation of a 