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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<html><head>
3<meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252"><title>PALM
4chapter 4.5.7</title> <meta name="GENERATOR" content="StarOffice 7 (Win32)"> <meta name="AUTHOR" content="Siegfried Raasch"> <meta name="CREATED" content="20041029;14344622"> <meta name="CHANGED" content="20050119;9531085"> <meta name="KEYWORDS" content="parallel LES model"> <style>
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9
10<body style="direction: ltr;" lang="en-US"><h4 style="line-height: 100%;"><font size="4">4.5.7
11Plots of
12isosurfaces, 2d cross sections and particles with dvrp</font></h4>
13<p style="line-height: 100%;">The <span style="font-weight: bold;">dvrp</span>
14software developed by the RRZN
15(Stephan Olbrich, Carsten Chmielewski) allows a creation of plot
16sequences with PALM,
17which can be animated via a special plugin for internet browsers. With
18suitable graphic hardware even stereoscopic views are
19possible. <br>
20In contrast to the other kinds of visualization output realized
21in PALM (<b>profil</b>, <b>iso2d</b> and <b>AVS</b>),
22where the data
23is output in a format suitable for the plot software, the creation of
24plots via <span style="font-weight: bold;">dvrp</span>
25software is
26integrated in PALM, i.e. respective routines are directly called within
27the PALM code. The
28<span style="font-weight: bold;">dvrp</span>
29routines then output the
30graphic data
31(so-called plot-primitives, e.g. polygones of isosurfaces) in a special
32dvr format. Since the <span style="font-weight: bold;">dvrp</span>
33software is parallelized (i.e. each PE calculates the graphic data for
34its subdomain), the visualization of simulations with very
35large numbers of grid points is possible (which so far failed because
36of
37several problems: volume of the raw data, which rapidly may sum-up to
38several Terabytes; main memory size needed for graphic workstations, on
39which the visualization is to be carried out; the insufficient scalar
40(!)
41computing speed of commercial graphic software in case of such
42large numbers of grid points). </p>
43<p style="line-height: 100%;">The coupling of <span style="font-weight: bold;">dvrp</span> software and
44PALM
45as well as the visualization of the model results via <span style="font-weight: bold;">dvrp</span> has been
46the main focus of the BMBF project "Application of
47tele-immersion in long-distance networks" (2001-2002),
48which was a joint project of RRZN, ZIB and IMUK. This work is currently
49continued by RRZN in the new DFG-funded project "EVITA - Untersuchung
50effizienter
51<br>Methoden zur visuellen und haptischen tele-immersiven
52Exploration
53<br>komplexer Volumen- und Str&ouml;mungsdaten aus
54parallelisierten,
55<br>dynamischen 3D-Simulationen" (2005-2007). </p>
56<p style="line-height: 100%;">The calls of the <span style="font-weight: bold;">dvrp</span> routines are
57contained within a
58PALM software package (see chapter <a href="chapter_3.7.html">3.7</a>).
59To use this package, the additional option <tt><font size="2">-p
60&ldquo;dvrp_graphics&rdquo;</font></tt>
61has to be given in the <b>mrun</b> call. This
62automatically links the
63required libraries.
64Steering of the plot output is done via the package
65parameters (see chapter <a href="chapter_4.2.html">4.2</a>).
66In contrast to all other PALM output, <span style="font-weight: bold;">dvrp</span>
67graphic
68data are not output to local files but directly to a special remote
69computer which is defined via the package parameter <a href="chapter_4.2.html#dvrp_host">dvrp_host</a>.
70The
71default values of the dvrp parameters are cause the output to be
72directed to a so-called streaming server at the
73RRZN. Apart from graphic data an additional html file is created, which
74can be used by an internet browser to view the data (a special <span style="font-weight: bold;">dvrp</span> plugin is
75needed). </p>
76<p style="line-height: 100%;">Since July 2001, the basic
77functionality
78of the <span style="font-weight: bold;">dvrp</span>
79software is
80installed in PALM and steerable via the
81package parameters. However, some code modifications may still need to
82be done by the user (e.g. in
83the subroutine <tt><font style="font-size: 10pt;" size="2">plot_dvrp</font></tt>
84in order to define suitable color tables).
85<br>For further detailed information please ask Siegfried Raasch.
86</p>
87<hr><p style="line-height: 100%;"><br>
88<font color="#000080"><font color="#000080"><a href="chapter_4.5.6.html"><font color="#000080"><img src="left.gif" name="Grafik1" align="bottom" border="2" height="32" width="32"></font></a><a href="index.html"><font color="#000080"><img src="up.gif" name="Grafik2" align="bottom" border="2" height="32" width="32"></font></a><a href="chapter_4.6.html"><font color="#000080"><img src="right.gif" name="Grafik3" align="bottom" border="2" height="32" width="32"></font></a></font></font></p><p style="line-height: 100%;">&nbsp;<i>Last
89change:&nbsp;</i> $Id: chapter_4.5.7.html 62 2007-03-13 02:52:40Z banzhafs $</p>
90</body></html>
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