Hi.

I am having a lot of trouble getting particle tracing to work - and frustratingly can't even get any output to work so trouble shooting is very difficult. I've broken down my situation below:

Setup:
-------

* PV 3.11 from git
* pv-Meshless plugin installed

Data:
-----

* time-aware XDMF files
* particles represented in PV on unstructured mesh using XDMF TopologyType="Polyvertex"

* Usually 100,000 to 10 million particles
        - Reduced size sample files are available at:

http://dl.dropbox.com/u/17666990/sample_particle_data.zip

- Each individual file is a single frame, which are assembled in a XDMF temporal collection in dump_argon_state_rdfval2_TEMPORAL- SUMMARY.xmf. This is the file that should be loaded to allow for access to all frames.


Output
--------

I would like to be able to trace the path of a subset of particles from within the larger dataset over time, and have its path traced out in 3D space. This is in contrast to tracing the advection of trace particles within a vector field, which is possible from what I understand via the ParticlePathlines filter.

I have tried playing around with the ParticleTracer and ParticlePathlines filters in PV, but cannot get anything to work.

One thing I'm wondering about is whether my particles jump around too much (i.e. their displacement is too large between frames). It is likely that this occurs because each frame represents the output from simulation code which may be separated by between 100 to 10000 simulation timesteps.

I have tried crawling through the PV mailing list archives but wasn't able to find many comments that were current, and fit what I was looking for. I am open to any suggestions on how I could get this working using my data, and would really, really appreciate if someone could point me towards some examples online that show the actual pipelines with sample data to pull off something like this.

Thanks,

Dan

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