ore,
a triangulated facet may have flipped orientation compared to its
neighbors.</li>

<p>The triangulation process detects degenerate facets with
only two neighbors.  These are marked degenerate.  They have
zero area.</p>

<p>
<li><b>Coplanar points</b> --
Option '<a href="qh-optq.htm#Qc">Qc</a>' is determined by
qh_check_maxout() after constructing the hull. Qhull needs to
retain all possible coplanar points in the facets' coplanar sets.
This depends on qh_RATIOnearInside in <tt>user.h.</tt>
Furthermore,