section</a></h2>

<p>
The identity pipe for Qhull reveals some precision questions for
halfspace intersections.  The identity pipe creates the convex hull of
a set of points and intersects the facets' hyperplanes.  It should return the input
points, but narrow distributions may drop points while offset distributions may add
points.  It may be better to normalize the input set about the origin.
For example, compare the first results with the later two results:  [T. Abraham]
<blockquote>
     rbox 100 s t | t