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<TITLE>Re: [Paraview] particle tracking</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>This conversation has basically become academic, but it would also be pretty easy to create a filter that reported a bunch of time steps and just passed the same data every time. The particle tracer would thing it was a time varying data even though it was not.<BR>
<BR>
Jean’s solution is still easier (and more clever), though.<BR>
<BR>
-Ken<BR>
<BR>
<BR>
On 2/12/09 7:00 AM, "Berk Geveci" <<a href="berk.geveci@kitware.com">berk.geveci@kitware.com</a>> wrote:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Interesting. I guess the biggest challenge of doing this in our<BR>
pipeline would be finding the time range. Ideally, the integration<BR>
should continue until all particles leave the domain or get stuck in a<BR>
stagnant region. That would require integrating them first and then<BR>
looking at the largest integration time.<BR>
<BR>
While I was writing this, Jean's response showed up. It is pretty<BR>
ingenious :-) This is why I love ParaView. It allows you to do things<BR>
in ways developers did not foresee.<BR>
<BR>
-berk<BR>
<BR>
On Thu, Feb 12, 2009 at 8:42 AM, John Biddiscombe <<a href="biddisco@cscs.ch">biddisco@cscs.ch</a>> wrote:<BR>
> Berk<BR>
><BR>
> Oops. I didn't notice that it was a "steady state" flow field. The<BR>
> TemporalStremTRacer expects unsteady flows, however it would be quite simple<BR>
> to modify it to use a single step. (I think easier than taking streamlines<BR>
> and animating particles along them - though thinking about it, the<BR>
> streamtracer code does have all that conversion of cell units to time which<BR>
> would be useful).<BR>
><BR>
> One could subclass the temporaltreamtracer, suppress the time requests and<BR>
> interpolate over a single step, then output time dependent data where the<BR>
> particles animate along the path (- how many steps would one want?) -<BR>
> clicking the play button would just advect them along.<BR>
><BR>
> (Just thinking out loud).<BR>
><BR>
> JB<BR>
><BR>
> I don't think this answers Pei's question. To my knowledge the<BR>
> temporal stream tracer (i.e. particle tracker) works only for<BR>
> time-dependent data. Am I wrong? To animate particles in a<BR>
> steady-state flow field, I'd think that you would generate streamlines<BR>
> and then somehow animate particles along those. I can't think of<BR>
> anything that would do this out-of-box but writing a filter that does<BR>
> this would be pretty easy. Is this something more than a few users<BR>
> would want?<BR>
><BR>
> -berk<BR>
><BR>
> On Thu, Feb 12, 2009 at 12:22 AM, David E DeMarle<BR>
> <<a href="dave.demarle@kitware.com">dave.demarle@kitware.com</a>> wrote:<BR>
><BR>
><BR>
> Hi Pei-Ying,<BR>
><BR>
> You may want to try ParaView Meshless<BR>
> (<a href="https://twiki.cscs.ch/twiki/bin/view/ParaViewMeshless">https://twiki.cscs.ch/twiki/bin/view/ParaViewMeshless</a>). It is a<BR>
> version of ParaView with the cutting edge of John Biddiscombe's<BR>
> particle tracking work in it. Some of those features will be/have been<BR>
> integrated into the main paraview code, but I can not vouch for when<BR>
> that will happen.<BR>
><BR>
> cheers,<BR>
> Dave DeMarle<BR>
><BR>
><BR>
> 2008/12/25 Pei-Ying Hsieh <<a href="phsieh2005@yahoo.com">phsieh2005@yahoo.com</a>>:<BR>
><BR>
><BR>
> Dear PVers:<BR>
><BR>
> I have a steady state flow field. I am wondering if PV can do particle<BR>
> tracking animation.<BR>
><BR>
> what I am looking for is similar to pathlines, but, instead of showing the<BR>
> lines, I would like to do an animation of seed particles "flowing" through<BR>
> the flow field. Is this possible?<BR>
><BR>
> Thanks! and wish everyone here a Happy New Year!<BR>
><BR>
><BR>
> Pei<BR>
><BR>
><BR>
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><BR>
><BR>
> --<BR>
> David E DeMarle<BR>
> Kitware, Inc.<BR>
> R&D Engineer<BR>
> 28 Corporate Drive<BR>
> Clifton Park, NY 12065-8662<BR>
> Phone: 518-371-3971 x109<BR>
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> --<BR>
> John Biddiscombe, email:biddisco @ cscs.ch<BR>
> <a href="http://www.cscs.ch/">http://www.cscs.ch/</a><BR>
> CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07<BR>
> Via Cantonale, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82<BR>
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**** Kenneth Moreland<BR>
*** Sandia National Laboratories<BR>
*********** <BR>
*** *** *** email: <a href="kmorel@sandia.gov">kmorel@sandia.gov</a><BR>
** *** ** phone: (505) 844-8919<BR>
*** web: <a href="http://www.cs.unm.edu/~kmorel">http://www.cs.unm.edu/~kmorel</a><BR>
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