 input avoids merged facets and the topological issues that
may arise.  If your application is sensitive to errors, consider joggled
input and the corresponding flag, <a href="http://www.qhull.org/src/libqhull_r/user_r.h#NOmerge">qh_NOmerge</a>.

<p>Qhull 3.1 and later provides option '<a href="qh-optq.htm#Qt">Qt</a>'
for triangulated output.  Non-simplicial facets are triangulated.
The facets may have zero area.
Triangulated output is particularly useful for Delaunay triangulations.</p>

<p>Qhull 2019.1 in