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diff --git a/src/qhull/html/qh-optt.htm b/src/qhull/html/qh-optt.htm new file mode 100644 index 000000000..0709f58c6 --- /dev/null +++ b/src/qhull/html/qh-optt.htm @@ -0,0 +1,278 @@ +<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> +<html> + +<head> +<title>Qhull trace options (T)</title> +</head> + +<body> +<!-- Navigation links --> +<p><b>Up:</b> <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> +• <a href="qh-quick.htm#options">Options</a> +• <a href="qh-opto.htm#output">Output</a> +• <a href="qh-optf.htm#format">Formats</a> +• <a href="qh-optg.htm#geomview">Geomview</a> +• <a href="qh-optp.htm#print">Print</a> +• <a href="qh-optq.htm#qhull">Qhull</a> +• <a href="qh-optc.htm#prec">Precision</a> +• <a href="qh-optt.htm#trace">Trace</a> +• <a href="../src/libqhull_r/index.htm">Functions</a></p> + +<hr> +<!-- Main text of document --> +<h1><a +href="http://www.geom.uiuc.edu/graphics/pix/Special_Topics/Computational_Geometry/delaunay.html"><img +src="qh--dt.gif" alt="[delaunay]" align="middle" width="100" +height="100"></a> Qhull trace options (T)</h1> + +This section lists the trace options for Qhull. These options are +indicated by 'T' followed by a letter. + +<p><b>Copyright © 1995-2015 C.B. Barber</b></p> + +<hr> + +<p><a href="index.htm#TOC">»</a> <a href="qh-quick.htm#programs">Programs</a> +<a name="trace">•</a> <a href="qh-quick.htm#options">Options</a> +• <a href="qh-opto.htm#output">Output</a> +• <a href="qh-optf.htm#format">Formats</a> +• <a href="qh-optg.htm#geomview">Geomview</a> +• <a href="qh-optp.htm#print">Print</a> +• <a href="qh-optq.htm#qhull">Qhull</a> +• <a href="qh-optc.htm#prec">Precision</a> +• <a href="qh-optt.htm#trace">Trace</a> +• <a href="../src/libqhull_r/index.htm">Functions</a></p> + +<h2>Trace options</h2> + +<dl compact> + <dt> </dt> + <dd><b>General</b></dd> + <dt><a href="#Tz">Tz</a></dt> + <dd>output error information to stdout instead of stderr</dd> + <dt><a href="#TI">TI file</a></dt> + <dd>input data from a file</dd> + <dt><a href="#TO">TO file</a></dt> + <dd>output results to a file</dd> + <dt><a href="#Ts">Ts</a></dt> + <dd>print statistics</dd> + <dt><a href="#TFn">TFn</a></dt> + <dd>report progress whenever n or more facets created</dd> + <dt><a href="#TRn">TRn</a></dt> + <dd>rerun qhull n times</dd> + <dt><a href="#Tv">Tv</a></dt> + <dd>verify result: structure, convexity, and point inclusion</dd> + + <dt> </dt> + <dt> </dt> + <dd><b>Debugging</b></dd> + <dt><a href="#Tc">Tc</a></dt> + <dd>check frequently during execution</dd> + <dt><a href="#TVn2">TVn</a></dt> + <dd>stop qhull after adding point n </dd> + <dt><a href="#TCn">TCn</a></dt> + <dd>stop qhull after building cone for point n</dd> + <dt><a href="#TVn">TV-n</a></dt> + <dd>stop qhull before adding point n</dd> + <dt><a href="#Tn">T4</a></dt> + <dd>trace at level n, 4=all, 5=mem/gauss, -1= events</dd> + <dt><a href="#TWn">TWn</a></dt> + <dd>trace merge facets when width > n</dd> + <dt><a href="#TMn">TMn</a></dt> + <dd>turn on tracing at merge n</dd> + <dt><a href="#TPn">TPn</a></dt> + <dd>turn on tracing when point n added to hull</dd> +</dl> + +<hr> + +<h3><a href="#trace">»</a><a name="Tc">Tc - check frequently +during execution </a></h3> + +<p>Qhull includes frequent checks of its data structures. Option +'Tc' will catch most inconsistency errors. It is slow and should +not be used for production runs. Option '<a href="#Tv">Tv</a>' +performs the same checks after the hull is constructed.</p> + +<h3><a href="#trace">»</a><a name="TCn">TCn - stop qhull after +building cone for point n</a></h3> + +<p>Qhull builds a cone from the point to its horizon facets. +Option 'TCn' stops Qhull just after building the cone. The output +for '<a href="qh-opto.htm#f">f</a>' includes the cone and the old +hull.'. </p> + +<h3><a href="#trace">»</a><a name="TFn">TFn - report summary +whenever n or more facets created </a></h3> + +<p>Option 'TFn' reports progress whenever more than n facets are +created. The test occurs just before adding a new point to the +hull. During post-merging, 'TFn' reports progress after more than +<i>n/2</i> merges. </p> + +<h3><a href="#trace">»</a><a name="TI">TI file - input data from file</a></h3> + +<p>Input data from 'file' instead of stdin. The filename may not +contain spaces or use single quotes. +You may use I/O redirection +instead (e.g., 'rbox 10 | qdelaunay >results').</P> + +<h3><a href="#trace">»</a><a name="TMn">TMn - turn on tracing at +merge n </a></h3> + +<p>Turn on tracing at n'th merge. </p> + +<h3><a href="#trace">»</a><a name="Tn">Tn - trace at level n</a></h3> + +<p>Qhull includes full execution tracing. 'T-1' traces events. +'T1' traces the overall execution of the program. 'T2' and 'T3' +trace overall execution and geometric and topological events. +'T4' traces the algorithm. 'T5' includes information about memory +allocation and Gaussian elimination. 'T1' is useful for logging +progress of Qhull in high dimensions.</p> + +<p>Option 'Tn' can produce large amounts of output. Use options '<a +href="#TPn">TPn</a>', '<a href="#TWn">TWn</a>', and '<a href="#TMn">TMn</a>' to selectively +turn on tracing. Since all errors report the last processed +point, option '<a href="#TPn">TPn</a>' is particularly useful.</p> + +<p>Different executions of the same program may produce different +traces and different results. The reason is that Qhull uses hashing +to match ridges of non-simplicial facets. For performance reasons, +the hash computation uses +memory addresses which may change across executions. + +<h3><a href="#trace">»</a><a name="TO">TO file - output results to file</a></h3> + +<p>Redirect stdout to 'file'. The filename may be enclosed in +single quotes. Unix and Windows NT users may use I/O redirection +instead (e.g., 'rbox 10 | qdelaunay >results').</P> +<p> +Windows95 users should always use 'TO file'. If they use I/O redirection, +error output is not sent to the console. Qhull uses single quotes instead +of double quotes because a missing double quote can +freeze Windows95 (e.g., do not run, rbox 10 | qhull TO "x)</p> +<p> + +<h3><a href="#trace">»</a><a name="TPn">TPn - turn on tracing +when point n added to hull </a></h3> + +<p>Option 'TPn' turns on tracing when point n is added to +the hull. It also traces partitions of point n. This option +reduces the output size when tracing. It is the normal +method to determine the cause of a Qhull error. All Qhull errors +report the last point added. + +<p>Use options 'TPn <a href="qh-optt.htm#TVn">TVn</a>' to +trace the addition of point n to the convex hull and stop when done.</p> + +<p>If used with option '<a href="qh-optt.htm#TWn">TWn</a>', +'TPn' turns off tracing after adding point n to the hull. +Use options 'TPn TWn' to +trace the addition of point n to the convex hull, partitions +of point n, and wide merges.</p> + +<h3><a href="#trace">»</a><a name="TRn">TRn - rerun qhull n times</a></h3> + +<p>Option 'TRn' reruns Qhull n times. It is usually used +with '<a href="qh-optq.htm#QJn">QJn</a>' to determine the probability +that a given joggle will fail. The summary +('<a href="qh-opto.htm#s">s</a>') lists the failure +rate and the precision errors that occurred. +Option '<a href="#Ts">Ts</a>' will report statistics for +all of the runs. Trace and output options only apply to the last +run. An event trace, '<a href="#Tn">T-1</a>' reports events for all runs. + +<p>Tracing applies to the last run of Qhull. If an error +is reported, the options list the run number as "_run". +To trace this run, set 'TRn' to the same value.</p> + +<h3><a href="#trace">»</a><a name="Ts">Ts - print statistics </a></h3> + +<p>Option 'Ts' collects statistics and prints them to stderr. For +Delaunay triangulations, the angle statistics are restricted to +the lower or upper envelope.</p> + +<h3><a href="#trace">»</a><a name="Tv">Tv - verify result: +structure, convexity, and point inclusion </a></h3> + +<p>Option 'Tv' checks the topological structure, convexity, and +point inclusion. If precision problems occurred, facet convexity +is tested whether or not 'Tv' is selected. Option 'Tv' does not +check point inclusion if forcing output with '<a +href="qh-optp.htm#Po">Po</a>', or if '<a href="qh-optq.htm#Q5">Q5</a>' +is set. </p> + +<p>The convex hull of a set of points is the smallest polytope +that includes the points. Option 'Tv' tests point inclusion. +Qhull verifies that all points are below all outer planes +(facet->maxoutside). Point inclusion is exhaustive if merging +or if the facet-point product is small enough; otherwise Qhull +verifies each point with a directed search (qh_findbest). To +force an exhaustive test when using option '<a +href="qh-optc.htm#C0">C-0</a>' (default), use 'C-1e-30' instead. </p> + +<p>Point inclusion testing occurs after producing output. It +prints a message to stderr unless option '<a +href="qh-optp.htm#Pp">Pp</a>' is used. This allows the user to +interrupt Qhull without changing the output. </p> + +<p>With '<a href=qvoronoi.htm>qvoronoi</a> <a href="qh-optf.htm#Fi2">Fi</a>' +and '<a href=qvoronoi.htm>qvoronoi</a> <a href="qh-optf.htm#Fo2">Fo</a>', +option 'Tv' collects statistics that verify all Voronoi vertices lie +on the separating hyperplane, and for bounded regions, all +separating hyperplanes are perpendicular bisectors. + +<h3><a href="#trace">»</a><a name="TVn">TV-n - stop qhull before +adding point n</a></h3> + +<p>Qhull adds one point at a time to the convex hull. See <a +href="qh-eg.htm#how">how Qhull adds a point</a>. Option 'TV-n' +stops Qhull just before adding a new point. Output shows the hull +at this time.</p> + +<h3><a href="#trace">»</a><a name="TVn2">TVn - stop qhull after +adding point n</a></h3> + +<p>Option 'TVn' stops Qhull after it has added point n. Output +shows the hull at this time.</p> + +<h3><a href="#trace">»</a><a name="TWn">TWn - trace merge facets +when width > n </a></h3> + +<p>Along with TMn, this option allows the user to determine the +cause of a wide merge.</p> +<h3><a href="#trace">»</a><a name="Tz">Tz - send all output to +stdout </a></h3> + +<p>Redirect stderr to stdout. </p> + +<!-- Navigation links --> +<hr> + +<p><b>Up:</b> <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> +• <a href="qh-quick.htm#options">Options</a> +• <a href="qh-opto.htm#output">Output</a> +• <a href="qh-optf.htm#format">Formats</a> +• <a href="qh-optg.htm#geomview">Geomview</a> +• <a href="qh-optp.htm#print">Print</a> +• <a href="qh-optq.htm#qhull">Qhull</a> +• <a href="qh-optc.htm#prec">Precision</a> +• <a href="qh-optt.htm#trace">Trace</a> +• <a href="../src/libqhull_r/index.htm">Functions</a></p> +<!-- GC common information --> +<hr> + +<p><a href="http://www.geom.uiuc.edu/"><img src="qh--geom.gif" +align="middle" width="40" height="40"></a><i>The Geometry Center +Home Page </i></p> + +<p>Comments to: <a href=mailto:qhull@qhull.org>qhull@qhull.org</a> +</a><br> +Created: Sept. 25, 1995 --- <!-- hhmts start --> Last modified: see top <!-- hhmts end --> </p> +</body> +</html> |