This file is indexed.

/usr/share/doc/libqhull-doc/html/qh-optp.htm is in libqhull-doc 2009.1-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>

<head>
<title>Qhull print options (P)</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>
&#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></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 print options (P)</h1>

This section lists the print options for Qhull. These options are
indicated by 'P' followed by a letter.  See 
<a href="qh-opto.htm#output">Output</a>, <a href="qh-optg.htm#geomview">Geomview</a>,
and <a href="qh-optf.htm#format">Format</a> for other output options.


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

<hr>

<p><a href="index.htm#TOC">»</a> <a href="qh-quick.htm#programs">Programs</a>
<a name="print">&#149;</a> <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="#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></p>

<h2>Print options</h2>
<blockquote>
<dl compact>
    <dt>&nbsp;</dt>
    <dd><b>General</b></dd>
    <dt><a href="#Pp">Pp</a></dt>
    <dd>do not report precision problems </dd>
    <dt><a href="#Po">Po</a></dt>
    <dd>force output despite precision problems</dd>
    <dt><a href="#Po2">Po</a></dt>
    <dd>if error, output neighborhood of facet</dd>
    <dt>&nbsp;</dt>
    <dt>&nbsp;</dt>
    <dd><b>Select</b></dd>
    <dt><a href="#Pdk">Pdk:n</a></dt>
    <dd>print facets with normal[k] &gt;= n (default 0.0)</dd>
    <dt><a href="#PDk">PDk:n</a></dt>
    <dd>print facets with normal[k] &lt;= n </dd>
    <dt><a href="#PFn">PFn</a></dt>
    <dd>print facets whose area is at least n</dd>
    <dt><a href="#Pg">Pg</a></dt>
    <dd>print good facets only (needs '<a href="qh-optq.htm#QGn">QGn</a>'
        or '<a href="qh-optq.htm#QVn">QVn </a>')</dd>
    <dt><a href="#PMn">PMn</a></dt>
    <dd>print n facets with most merges</dd>
    <dt><a href="#PAn">PAn</a></dt>
    <dd>print n largest facets by area</dd>
    <dt><a href="#PG">PG</a></dt>
    <dd>print neighbors of good facets</dd>
</dl>
</blockquote>
<hr>

<h3><a href="#print">»</a><a name="PAn">PAn - keep n largest
facets by area</a></h3>

<p>The <i>n</i> largest facets are marked good for printing. This
may be useful for <a href="qh-impre.htm#approximate">approximating
a hull</a>. Unless '<a href="#PG">PG</a>' is set, '<a href="#Pg">Pg</a>'
is automatically set. </p>

<h3><a href="#print">»</a><a name="Pdk">Pdk:n - print facet if
normal[k] &gt;= n </a></h3>

<p>For a given output, print only those facets with <i>normal[k] &gt;= n</i>
and <i>drop</i> the others.  For example, 'Pd0:0.5' prints facets with <i>normal[0]
&gt;= 0.5 </i>. The default value of <i>n</i> is zero. For
example in 3-d, 'Pd0d1d2' prints facets in the positive octant.
<p>
If no facets match, the closest facet is returned.</p>
<p>
On Windows 95, do not combine multiple options.  A 'd' is considered
part of a number.  For example, use 'Pd0:0.5 Pd1:0.5' instead of
'Pd0:0.5d1:0.5'.

<h3><a href="#print">»</a><a name="PDk">PDk:n - print facet if
normal[k] &lt;= n</a></h3>

<p>For a given output, print only those facets with <i>normal[k] &lt;= n</i>
and <i>drop</i> the others.  
For example, 'PD0:0.5' prints facets with <i>normal[0]
&lt;= 0.5 </i>. The default value of <i>n</i> is zero. For
example in 3-d, 'PD0D1D2' displays facets in the negative octant.
<p>
If no facets match, the closest facet is returned.</p>

<p>In 2-d, 'd G PD2' displays the Delaunay triangulation instead
of the corresponding paraboloid. </p>

<p>Be careful of placing 'Dk' or 'dk' immediately after a real
number. Some compilers treat the 'D' as a double precision
exponent. </p>

<h3><a href="#print">»</a><a name="PFn">PFn - keep facets whose
area is at least n</a></h3>

<p>The facets with area at least <i>n</i> are marked good for
printing. This may be useful for <a
href="qh-impre.htm#approximate">approximating a hull</a>. Unless
'<a href="#PG">PG</a>' is set, '<a href="#Pg">Pg</a>' is
automatically set. </p>

<h3><a href="#print">»</a><a name="Pg">Pg - print good facets </a></h3>

<p>Qhull can mark facets as &quot;good&quot;. This is used to</p>

<ul>
    <li>mark the lower convex hull for Delaunay triangulations
        and Voronoi diagrams</li>
    <li>mark the facets that are visible from a point (the '<a
        href="qh-optq.htm#QGn">QGn </a>' option)</li>
    <li>mark the facets that contain a point (the '<a
        href="qh-optq.htm#QVn">QVn</a>' option).</li>
    <li>indicate facets with a large enough area (options '<a
        href="#PAn">PAn</a>' and '<a href="#PFn">PFn</a>')</li>
</ul>

<p>Option '<a href="#Pg">Pg</a>' only prints good facets that
also meet '<a href="#Pdk">Pdk</a>' and '<a href="#PDk">PDk</a>'
options. It is automatically set for options '<a href="#PAn">PAn</a>',
'<a href="#PFn">PFn </a>', '<a href="qh-optq.htm#QGn">QGn</a>',
and '<a href="qh-optq.htm#QVn">QVn</a>'.</p>

<h3><a href="#print">»</a><a name="PG">PG - print neighbors of
good facets</a></h3>

<p>Option 'PG' can be used with or without option '<a href="#Pg">Pg</a>'
to print the neighbors of good facets. For example, options '<a
href="qh-optq.htm#QGn">QGn</a>' and '<a href="qh-optq.htm#QVn">QVn</a>'
print the horizon facets for point <i>n. </i></p>

<h3><a href="#print">»</a><a name="PMn">PMn - keep n facets with
most merges</a></h3>

<p>The n facets with the most merges are marked good for
printing. This may be useful for <a
href="qh-impre.htm#approximate">approximating a hull</a>. Unless
'<a href="#PG">PG</a>' is set, '<a href="#Pg">Pg</a>' is
automatically set. </p>

<p>Use option '<a href="qh-optf.htm#Fm">Fm</a>' to print merges
per facet.

<h3><a href="#print">»</a><a name="Po">Po - force output despite
precision problems</a></h3>

<p>Use options 'Po' and '<a href="qh-optq.htm#Q0">Q0</a>' if you
can not merge facets, triangulate the output ('<a href="qh-optq.htm#Qt">Qt</a>'), 
or joggle the input (<a href="qh-optq.htm#QJn">QJ</a>). 

<p>Option 'Po' can not force output when
duplicate ridges or duplicate facets occur. It may produce
erroneous results. For these reasons, merged facets, joggled input, or <a
href="qh-impre.htm#exact">exact arithmetic</a> are better.</p>

<p>If you need a simplicial Delaunay triangulation, use 
joggled input '<a href="qh-optq.htm#QJn">QJ</a>' or triangulated
output '<a
href="qh-optf.htm#Ft">Ft</a>'. 

<p>Option 'Po' may be used without '<a href="qh-optq.htm#Q0">Q0</a>'
to remove some steps from Qhull or to output the neighborhood of
an error.</p>

<p>Option 'Po' may be used with option '<a href="qh-optq.htm#Q5">Q5</a>')
to skip qh_check_maxout (i.e., do not determine the maximum outside distance).
This can save a significant amount of time.

<p>If option 'Po' is used,</p>

<ul>
    <li>most precision errors allow Qhull to continue. </li>
    <li>verify ('<a href="qh-optt.htm#Tv">Tv</a>') does not check
        coplanar points.</li>
    <li>points are not partitioned into flipped facets and a
        flipped facet is always visible to a point. This may
        delete flipped facets from the output. </li>
</ul>

<h3><a href="#print">»</a><a name="Po2">Po - if error, output
neighborhood of facet</a></h3>

<p>If an error occurs before the completion of Qhull and tracing
is not active, 'Po' outputs a neighborhood of the erroneous
facets (if any). It uses the current output options.</p>

<p>See '<a href="qh-optp.htm#Po">Po</a>' - force output despite
precision problems.

<h3><a href="#print">»</a><a name="Pp">Pp - do not report
precision problems </a></h3>

<p>With option 'Pp', Qhull does not print statistics about
precision problems, and it removes some of the warnings.  It
removes the narrow hull warning.</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>
&#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></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>