#detvridge3">qh_detvridge3</a> determine 3-d Voronoi
ridge for an input site
<li><a href="io.c#facet2point">qh_facet2point</a> return two
projected temporary vertices for a 2-d facet ('m', 'G')</li>
<li><a href="io.c#markvoronoi">qh_markvoronoi</a> mark Voronoi
vertices for printing
<li><a href="io.c#printcenter">qh_printcenter</a> print
facet-&gt;center as centrum or Voronoi center ('Ft', 'v p', 'FC', 'f') </li>
<li><a href="io.c#printpoint">qh_printpoint</a>, qh_printpointid, print
coordinates of a point 