facets. </p>


<h2><a href="#TOC">&#187;</a><a name="injoggle">Joggled input</a></h2>

<p>Joggled input is a simple work-around for precision problems
in computational geometry [&quot;joggle: to shake or jar
slightly,&quot; Amer. Heritage Dictionary].  Other names are
<i>jostled input</i> or <i>random perturbation</i>.
Qhull joggles the
input by modifying each coordinate by a small random quantity. If
a precision problem occurs, Qhull joggles the input with a larger
quantity and the algorithm is restarted. 