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<p class="MsoNormal">(Replying back to the ParaView mailing list so others can benefit from the conversation or fill in my knowledge gaps.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I admit that I have found the Temporal Particles To Pathlines filter sometimes temperamental. I have to guess what might be going wrong. Here are some possibilities:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The filter draws lines of data as points move around over time. No lines will be drawn unless you hit that play button.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The filter needs to have consistent ids to know how to attach points from one time step to another.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The filter has a mask points feature that by default tracks only 1 out of every 100 points. You might need to lower that (possibly down to 1) to make things visible.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The filter has a max step distance option that will ignore connections of particles that move more than a certain distance between time steps. By default, that distance is 1 unit in every direction. If you have data that covers
a large space, it might be the particles are moving too far to be tracked. You might need to bump that up.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>The filter relies on time metadata in its input dataset to track when time advances. If this metadata is not there, you will probably get some errors in the output message window (with one about DATA_TIME_STEPS), and you will
get no output data.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Without seeing your data, I don’t think I can narrow down the problem any further.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Ken<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-left:.5in"><b><span style="color:black">From: </span>
</b><span style="color:black">"David I. Robinson" <d.robinson@hrwallingford.com><br>
<b>Date: </b>Tuesday, November 15, 2016 at 2:32 AM<br>
<b>To: </b>"Moreland, Kenneth" <kmorel@sandia.gov><br>
<b>Subject: </b>RE: [EXTERNAL] [Paraview] animating particle pathlines</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
</div>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#1F497D">Hi Ken,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#1F497D">Do you know how to make that work? I’ve have wrestled with that filter endlessly with no success. I just get a blank screen, or it crashes.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#1F497D">Dave</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:Tahoma;mso-fareast-language:EN-GB">From:</span></b><span style="font-size:10.0pt;font-family:Tahoma;mso-fareast-language:EN-GB"> Moreland, Kenneth [mailto:kmorel@sandia.gov]
<br>
<b>Sent:</b> Monday, November 14, 2016 10:30 PM<br>
<b>To:</b> David I. Robinson<br>
<b>Cc:</b> paraview@paraview.org<br>
<b>Subject:</b> Re: [EXTERNAL] [Paraview] animating particle pathlines</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in">
That sounds like a job for the "Temporal Particles To Pathlines" filter. <o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:.5in">-Ken<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> <o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:.5in">Sent from my iPad so blame autocorrect.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:.5in">
<br>
On Nov 14, 2016, at 10:54 AM, David I. Robinson <<a href="mailto:d.robinson@hrwallingford.com">d.robinson@hrwallingford.com</a>> wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C">Hello,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C">I’m trying to visualise lagrangian particle pathlines. I have run an openFoam simulation with particle tracking and would like to view the paths that
the particles take. I have read lots of discussion of this on the internet, but without much success. I can load the data in Paraview and assign glyphs, but I can’t visualise the pathlines taken by the particles.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C">I am cautious that Paraview might have some functionality for interpolating particle tracking from the eulerian data. I might end-up visualising this
approximation, rather than the lagrangian data calculated on a timestep-by-timestep basis by openFoam. (Although an ability to do either or both would be useful!)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C">So far, my best luck seems to have come from masking my data and then using the particlepath filter, using the un-masked data as my input and the masked
data as a seed. This is OK, but requires me to incrementally increase the finished time to observe the particle paths.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C">Can you offer any help?</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C;mso-fareast-language:EN-GB">Dr David Robinson</span></b><span style="font-size:10.0pt;font-family:Arial;color:#3C3C3C;mso-fareast-language:EN-GB"><br>
Engineer, Coastal Structures<br>
<br>
E: <a href="mailto:d.robinson@hrwallingford.com"><span style="color:black">d.robinson@hrwallingford.com</span></a><br>
T: +44 (0)1491 822397</span><o:p></o:p></p>
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