convex hull correspond to the <a
href="qdelau_f.html">furthest-site Delaunay triangulation</a>.
See the examples, <a href="qh-eg.html#delaunay">Delaunay and
Voronoi diagrams</a>.</p>

<p>See <a href="http://www.qhull.org/html/qh-faq.html#TOC">Qhull FAQ</a> (<a href="qh-faq.html#TOC">local</a>) - Delaunay and
Voronoi diagram questions.</p>

<p>By default, qdelaunay merges cocircular and cospherical regions.
For example, the Delaunay triangulation of a square inside a diamond
('rbox D2 c d G4 | qdelaunay') co