 (the default)
when you want non-simplicial output (e.g., the faces of a cube).
<li>Use joggled input ('<a href="qh-optq.htm#QJn">QJ</a>') when you need clearly-convex,
simplicial output.
<li>Use joggled input if your code is sensitive to errors.  Joggled input handles
all inputs, even highly degenerate inputs such as 100 identical points.  If you compile
with <a href="http://www.qhull.org/src/libqhull_r/user_r.h#NOmerge">qh_NOmerge</a>, Qhull
does not contain code for merging facets.  It uses joggled input