new facets.
It leaves other cases as is.  The orientation of nonsimplicial facets is ill-defined.
Ridges may have the same vertices.  Adjacent nonsimplicial
facets may have incompatible triangulations.  These problems may be addressed in future releases of Qhull.
<p>
<li><b>Facet with zero-area</b> --
It is possible for a zero-area facet to be convex with its
neighbors. This can occur if the hyperplanes of neighboring
facets are above the facet's centrum, and the facet's hyperplane
is above the neighboring 