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6  <title>PALM chapter 4.5.7</title>
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8  <meta name="AUTHOR" content="Siegfried Raasch">
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19<h4 style="line-height: 100%;"><font size="4">4.5.7 Plots of
20isosurfaces, 2d cross sections and particles with dvrp</font></h4>
21<p style="line-height: 100%;">The <span style="font-weight: bold;">dvrp</span>
22software developed by the RRZN
23(Stephan Olbrich, Carsten Chmielewski) allows a creation of plot
24sequences with PALM,
25which can be animated via a special plugin for internet browsers. With
26suitable graphic hardware even stereoscopic views are
27possible. <br>
28In contrast to the other kinds of visualization output realized
29in PALM (<b>profil</b>, <b>iso2d</b> and <b>AVS</b>), where the data
30is output in a format suitable for the plot software, the creation of
31plots via <span style="font-weight: bold;">dvrp</span> software is
32integrated in PALM, i.e. respective routines are directly called within
33the PALM code. The
34<span style="font-weight: bold;">dvrp</span> routines then output the
35graphic data
36(so-called plot-primitives, e.g. polygones of isosurfaces) in a special
37dvr format. Since the <span style="font-weight: bold;">dvrp</span>
38software is parallelized (i.e. each PE calculates the graphic data for
39its subdomain), the visualization of simulations with very
40large numbers of grid points is possible (which so far failed because
41of
42several problems: volume of the raw data, which rapidly may sum-up to
43several Terabytes; main memory size needed for graphic workstations, on
44which the visualization is to be carried out; the insufficient scalar
45(!)
46computing speed of commercial graphic software in case of such
47large numbers of grid points). </p>
48<p style="line-height: 100%;">The coupling of <span
49 style="font-weight: bold;">dvrp</span> software and PALM
50as well as the visualization of the model results via <span
51 style="font-weight: bold;">dvrp</span> has been
52the main focus of the BMBF project "Application of
53tele-immersion in long-distance networks" (2001-2002),
54which was a joint project of RRZN, ZIB and IMUK. This work is currently
55continued by RRZN in the new DFG-funded project "EVITA - Untersuchung
56effizienter
57<br>
58Methoden zur visuellen und haptischen tele-immersiven Exploration
59<br>
60komplexer Volumen- und Strömungsdaten aus parallelisierten,
61<br>
62dynamischen 3D-Simulationen" (2005-2007). </p>
63<p style="line-height: 100%;">The calls of the <span
64 style="font-weight: bold;">dvrp</span> routines are contained within a
65PALM software package (see chapter <a href="chapter_3.7.html">3.7</a>).
66To use this package, the additional option <tt><font size="2">-p
67“dvrp_graphics”</font></tt>
68has to be given in the <b>mrun</b> call. This automatically links the
69required libraries.
70Steering of the plot output is done via the package
71parameters (see chapter <a href="chapter_4.2.html">4.2</a>).
72In contrast to all other PALM output, <span style="font-weight: bold;">dvrp</span>
73graphic
74data are not output to local files but directly to a special remote
75computer which is defined via the package parameter <a
76 href="chapter_4.2.html#dvrp_host">dvrp_host</a>.
77The
78default values of the dvrp parameters are cause the output to be
79directed to a so-called streaming server at the
80RRZN. Apart from graphic data an additional html file is created, which
81can be used by an internet browser to view the data (a special <span
82 style="font-weight: bold;">dvrp</span> plugin is needed). </p>
83<p style="line-height: 100%;">Since July 2001, the basic functionality
84of the <span style="font-weight: bold;">dvrp</span> software is
85installed in PALM and steerable via the
86package parameters. However, some code modifications may still need to
87be done by the user (e.g. in
88the subroutine <tt><font style="font-size: 10pt;" size="2">plot_dvrp</font></tt>
89in order to define suitable color tables).
90<br>
91For further detailed information please ask Siegfried Raasch. </p>
92<hr>
93<p style="line-height: 100%;"><br>
94<font color="#000080"><font color="#000080"><a href="chapter_4.5.6.html"><font
95 color="#000080"><img src="left.gif" name="Grafik1" align="bottom"
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100 border="2" height="32" width="32"></font></a></font></font></p>
101<p style="line-height: 100%;">&nbsp;<i>Last change:&nbsp;</i> 20/04/05
102(SR)</p>
103</body>
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