for accuracy. Qhull's error bound is empirical instead of
theoretical.</p>

<p>Qhull 1.0 checked for precision errors but did not handle
them. The output could contain concave facets, facets with
inverted orientation (&quot;flipped&quot; facets), more than two
facets adjacent to a ridge, and two facets with exactly the same
set of vertices.</p>

<p>Qhull 2.4 and later automatically handles errors due to
machine round-off. Option '<a href="qh-optc.htm#C0">C-0</a>' or '<a
href="qh-optq.htm#Qx">Qx</a>' is set 