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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a series of particle data files that I have written using the VTK XML PolyData file format (.vtp, I guess). I can use those to display the actual particles just fine with glyphs, but I’d like to also see a pathline being displayed for particles. I am therefore trying to use the ‘Particle Pathline’ filter.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The particles are simulated in a flow field, where new particles come in and older particles leave the system at every timestep. I therefore also have a ‘point data’ array called “ParticleID” which tags a unique ID to each particle (starting with a zero index). It is defined as such:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><PointData><o:p></o:p></p><p class=MsoNormal> <DataArray type="Int32" Name="ParticleID" NumberOfComponents="1" format="ascii"><o:p></o:p></p><p class=MsoNormal> …<o:p></o:p></p><p class=MsoNormal> </DataArray><o:p></o:p></p><p class=MsoNormal>… other arrays…<o:p></o:p></p><p class=MsoNormal></PointData><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When I try to use this array as the “Id Channel Array” in the filter, however, I get no output whatsoever from the filter. I think the rest of the file is correct because the filter DOES generate pathlines when I leave the “Id Channel Filter” to “Global or Local IDs”, but the paths get messed up as soon as some particles start leaving the domain (as they should, I guess). <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What am I doing wrong? Do I need to define this ‘ParticleID’ array differently?<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thank you for your help,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Charles Boivin<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>