tt>poly2.c</tt> to locate the facet or adjacent
facet that contains a point.  First lift the point to the
paraboloid (i.e., the last coordinate is the sum of the squares
of the point's coordinates -- <tt>qh_setdelaunay</tt>). Do not use options
'<a href="qh-optq.html#Qbb">Qbb</a>', '<a href="qh-optq.html#QbB">QbB</a>',
'<a href="qh-optq.html#Qbk">Qbk:n</a>', or '<a
href="qh-optq.html#QBk">QBk:n</a>' since these scale the last
coordinate.  See <a href="qh-code.html#findfacet">locate a facet with
qh_findbestf