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<p class="MsoPlainText">The data looks like rubbish to me. Points jump around in seemingly random sequences.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Either ...<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">1) time steps are too large<o:p></o:p></p>
<p class="MsoPlainText">2) ID's are not consistent so partice N is not being correctly tracked.<o:p></o:p></p>
<p class="MsoPlainText">3) (particles are being destroyed and recreated and reusing ID’s from previous particles)<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">using the test data you uploaded, I used ‘find data’ to extract particles between ID 1 and 50, then added a particlepathlines filter and let it run. Looks rubbish. Also you seem to have a periodic boundary, so I set the max step size
to 20, (your box seems to be 25 across), the max step size is useful for solving periodic boundaries and issue 3) above.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">you need better data to get a decent animation.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">JB<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><img width="746" height="671" id="Picture_x0020_1" src="cid:image001.jpg@01CBF512.CA9B1A50"><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span lang="EN-US">-----Original Message-----<br>
From: paraview-bounces@paraview.org [mailto:paraview-bounces@paraview.org] On Behalf Of Dan Lussier<br>
Sent: 06 April 2011 21:37<br>
To: paraview@paraview.org<br>
Subject: [Paraview] particle tracing and particle tails help</span><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Hi.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I am having a lot of trouble getting particle tracing to work - and
<o:p></o:p></p>
<p class="MsoPlainText">frustratingly can't even get any output to work so trouble shooting is
<o:p></o:p></p>
<p class="MsoPlainText">very difficult. I've broken down my situation below:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Setup:<o:p></o:p></p>
<p class="MsoPlainText">-------<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">* PV 3.11 from git<o:p></o:p></p>
<p class="MsoPlainText">* pv-Meshless plugin installed<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Data:<o:p></o:p></p>
<p class="MsoPlainText">-----<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">* time-aware XDMF files<o:p></o:p></p>
<p class="MsoPlainText">* particles represented in PV on unstructured mesh using XDMF
<o:p></o:p></p>
<p class="MsoPlainText">TopologyType="Polyvertex"<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">* Usually 100,000 to 10 million particles<o:p></o:p></p>
<p class="MsoPlainText"> - Reduced size sample files are available at:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">http://dl.dropbox.com/u/17666990/sample_particle_data.zip<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> - Each individual file is a single frame, which are assembled in a
<o:p></o:p></p>
<p class="MsoPlainText">XDMF temporal collection in dump_argon_state_rdfval2_TEMPORAL-
<o:p></o:p></p>
<p class="MsoPlainText">SUMMARY.xmf. This is the file that should be loaded to allow for
<o:p></o:p></p>
<p class="MsoPlainText">access to all frames.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Output<o:p></o:p></p>
<p class="MsoPlainText">--------<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I would like to be able to trace the path of a subset of particles
<o:p></o:p></p>
<p class="MsoPlainText">from within the larger dataset over time, and have its path traced out
<o:p></o:p></p>
<p class="MsoPlainText">in 3D space. This is in contrast to tracing the advection of trace
<o:p></o:p></p>
<p class="MsoPlainText">particles within a vector field, which is possible from what I
<o:p></o:p></p>
<p class="MsoPlainText">understand via the ParticlePathlines filter.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I have tried playing around with the ParticleTracer and <o:p>
</o:p></p>
<p class="MsoPlainText">ParticlePathlines filters in PV, but cannot get anything to work.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">One thing I'm wondering about is whether my particles jump around too
<o:p></o:p></p>
<p class="MsoPlainText">much (i.e. their displacement is too large between frames). It is
<o:p></o:p></p>
<p class="MsoPlainText">likely that this occurs because each frame represents the output from <o:p></o:p></p>
<p class="MsoPlainText">simulation code which may be separated by between 100 to 10000
<o:p></o:p></p>
<p class="MsoPlainText">simulation timesteps.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I have tried crawling through the PV mailing list archives but wasn't
<o:p></o:p></p>
<p class="MsoPlainText">able to find many comments that were current, and fit what I was
<o:p></o:p></p>
<p class="MsoPlainText">looking for. I am open to any suggestions on how I could get this
<o:p></o:p></p>
<p class="MsoPlainText">working using my data, and would really, really appreciate if someone
<o:p></o:p></p>
<p class="MsoPlainText">could point me towards some examples online that show the actual
<o:p></o:p></p>
<p class="MsoPlainText">pipelines with sample data to pull off something like this.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Dan<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">_______________________________________________<o:p></o:p></p>
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<p class="MsoPlainText">Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView<o:p></o:p></p>
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