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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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101 | <p style="line-height: 100%;"> <i>Last change: </i> 20/04/05 |
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102 | (SR)</p> |
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