iated help messages, e.g., for degenerate inputs
</ul>

<h3><a href="qh-user_r.htm#TOC">&#187;</a><a name="umerge">merge
constants</a></h3>
<ul>
<li><a href="user_r.h#BESTcentrum">qh_BESTcentrum</a>
when does qh_findbestneighbor() test centrums? </li>
<li><a href="user_r.h#BESTnonconvex">qh_BESTnonconvex</a>
when does qh_findbestneighbor() test nonconvex
ridges only? </li>
<li><a href="user_r.h#COPLANARratio">qh_COPLANARratio</a>
what is qh.MINvisible? </li>
<li><a href="user_r.h#DIMreduceBuild">qh_DIMreduc