ut a point is
equivalent to a convex hull by polar duality.

<p>The <tt>qhull</tt> program provides options to build these
structures and to experiment with the process.  Use the
<a href=qconvex.htm>qconvex</a>,
<a href=qdelaun.htm>qdelaunay</a>, <a href=qhalf.htm>qhalf</a>,
and <a href=qvoronoi.htm>qvoronoi</a> programs
to build specific structures.  You may use <tt>qhull</tt> instead.
It takes the same options and uses the same code.
<blockquote>
<dl>
    <dt><b>Example:</b> rbox 1000 D3 | qhull
         