qh-impre.htm

来自「Quick hull implementation」· HTM 代码 · 共 53 行

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<head>
<title>Imprecision in Qhull</title>
</head>

<body>
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<p><a name="TOP"><b>Up:</b></a> <a href="http://www.qhull.org">Home
page</a> for Qhull <br>
<b>Up:</b> <a href="index.htm#TOC">Qhull manual</a>: Table of
Contents<br>
<b>To:</b> <a href="qh-quick.htm#programs">Programs</a>
&#149; <a href="qh-quick.htm#options">Options</a> 
&#149; <a href="qh-opto.htm#output">Output</a> 
&#149; <a href="qh-optf.htm#format">Formats</a> 
&#149; <a href="qh-optg.htm#geomview">Geomview</a> 
&#149; <a href="qh-optp.htm#print">Print</a>
&#149; <a href="qh-optq.htm#qhull">Qhull</a> 
&#149; <a href="qh-optc.htm#prec">Precision</a> 
&#149; <a href="qh-optt.htm#trace">Trace</a><br>
<b>To: </b><a href="#TOC">Qhull imprecision</a>: Table of Contents
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<h1><a
href="http://www.geom.uiuc.edu/graphics/pix/Special_Topics/Computational_Geometry/4dcube.html"><img
src="qh--4d.gif" alt="[4-d cube]" align="middle" width="100"
height="100"></a> Imprecision in Qhull</h1>

<p>This section of the Qhull manual discusses the problems caused
by coplanar points and why Qhull uses options '<a
href="qh-optc.htm#C0">C-0</a>' or '<a href="qh-optq.htm#Qx">Qx</a>'
by default. If you ignore precision issues with option '<a
href="qh-optq.htm#Q0">Q0</a>', the output from Qhull can be
arbitrarily bad. Qhull avoids precision problems if you merge facets (the default) or joggle
the input ('<a
href="qh-optq.htm#QJn">QJ</a>'). </p>

<p>Use option '<a href="qh-optt.htm#Tv">Tv</a>' to verify the
output from Qhull. It verifies that adjacent facets are clearly
convex. It verifies that all points are on or below all facets. </p>

<p>Qhull automatically tests for convexity if it detects
precision errors while constructing the hull. </p>

<p><b>Copyright &copy; 1995-2003 The Geometry Center, Minneapolis MN</b></p>

<hr>

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