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