[Paraview] particle tracking

[Moreland, Kenneth]

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.

Jean's solution is still easier (and more clever), though.

-Ken


On 2/12/09 7:00 AM, "Berk Geveci" <berk.geveci at kitware.com> wrote:

Interesting. I guess the biggest challenge of doing this in our
pipeline would be finding the time range. Ideally, the integration
should continue until all particles leave the domain or get stuck in a
stagnant region. That would require integrating them first and then
looking at the largest integration time.

While I was writing this, Jean's response showed up. It is pretty
ingenious :-) This is why I love ParaView. It allows you to do things
in ways developers did not foresee.

-berk

On Thu, Feb 12, 2009 at 8:42 AM, John Biddiscombe <biddisco at cscs.ch> wrote:
> Berk
>
> Oops. I didn't notice that it was a "steady state" flow field. The
> TemporalStremTRacer expects unsteady flows, however it would be quite simple
> to modify it to use a single step. (I think easier than taking streamlines
> and animating particles along them - though thinking about it, the
> streamtracer code does have all that conversion of cell units to time which
> would be useful).
>
> One could subclass the temporaltreamtracer, suppress the time requests and
> interpolate over a single step, then output time dependent data where the
> particles animate along the path (- how many steps would one want?) -
> clicking the play button would just advect them along.
>
> (Just thinking out loud).
>
> JB
>
> I don't think this answers Pei's question. To my knowledge the
> temporal stream tracer (i.e. particle tracker) works only for
> time-dependent data. Am I wrong? To animate particles in a
> steady-state flow field, I'd think that you would generate streamlines
> and then somehow animate particles along those. I can't think of
> anything that would do this out-of-box but writing a  filter that does
> this would be pretty easy. Is this something more than a few users
> would want?
>
> -berk
>
> On Thu, Feb 12, 2009 at 12:22 AM, David E DeMarle
> <dave.demarle at kitware.com> wrote:
>
>
> Hi Pei-Ying,
>
> You may want to try ParaView Meshless
> (https://twiki.cscs.ch/twiki/bin/view/ParaViewMeshless). It is a
> version of ParaView with the cutting edge of John Biddiscombe's
> particle tracking work in it. Some of those features will be/have been
> integrated into the main paraview code, but I can not vouch for when
> that will happen.
>
> cheers,
> Dave DeMarle
>
>
> 2008/12/25 Pei-Ying Hsieh <phsieh2005 at yahoo.com>:
>
>
> Dear PVers:
>
> I have a steady state flow field.  I am wondering if PV can do particle
> tracking animation.
>
> what I am looking for is similar to pathlines, but, instead of showing the
> lines, I would like to do an animation of seed particles "flowing" through
> the flow field.  Is this possible?
>
> Thanks! and wish everyone here a Happy New Year!
>
>
> Pei
>
>
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>
> --
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
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> --
> John Biddiscombe,                            email:biddisco @ cscs.ch
> http://www.cscs.ch/
> CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
> Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82
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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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