[Paraview] Particle tracer

Wed Apr 18 16:08:55 EDT 2012

Hi Burlen,

I am hoping that Utkarsh could help figure things out.
If you elaborate more on what you do and what happens, I could at least
share my experience.
I use *.vtr type files to generate particle trace and pathlines.
The problem I have/had is that as soon as I apply any Temporal Filter to
the *.vtr file series, it either gives me error message or crashes.
I was very very very lucky that I found out that for the same dataset, if I
use *.vtu format, no problems or crashing occurred. So, for now, I just
used a Clip filter to extract my data into a *.vtu format and rewrite them,
re-read them and do the ParticleTrace and ParticlePathlines.
That was my experience.

Let me know if I could be of any help.
Good luck,
Mohamad

On Wed, Apr 18, 2012 at 11:15 AM, Burlen Loring <bloring at lbl.gov> wrote:

> **
> Hi Mohamad,
>
> I've been quietly following this thread in hopes that your interest in
> particle tracing will spark a response from the developers. I was unable to
> generate pathlines in image data in vti format I beleive I was using 3.10.0
> at the time. It was not clear to me if there was a bug or if I had the
> pipeline built incorrectly out of my own ignorance on how this works in PV.
> I posted a question with test data hoping for some advise,
> http://paraview.markmail.org/message/ek67niwr7xagaajz?q=burlen+order:date-backward&page=15however I did not receive any reply.
>
> Burlen
>
>
> On 04/07/2012 05:28 AM, Mohamad M. Nasr-Azadani wrote:
>
> I apologize for some mistakes.
> The Powerpoint I was refering to can be found here.
>
>  *paraview*.org/Wiki/images/2/20/IEEE08_*Time-In-ParaView*.ppt
>
>
>  Best,
> Mohamad
>
>  On Sat, Apr 7, 2012 at 5:22 AM, Mohamad M. Nasr-Azadani <mmnasr at gmail.com
> > wrote:
>
>> Hi all,
>>
>>  This is what I doing:
>>
>>  1- Load the PVD file (which holds the real time information associated
>> with each *.vtr file)
>>
>>  <?xml version="1.0"?>
>>  <VTKFile type="Collection" version="0.1" byte_order="LittleEndian"
>> compressor="vtkZLibDataCompressor">
>>    <Collection>
>>     <DataSet timestep="0.0" group="" part="0" file="vel_vec_0.vtr"/>
>>     <DataSet timestep="0.2" group="" part="0" file="vel_vec_1.vtr"/>
>>     <DataSet timestep="0.4" group="" part="0" file="vel_vec_2.vtr"/>
>>     <DataSet timestep="0.6" group="" part="0" file="vel_vec_3.vtr"/>
>>     <DataSet timestep="0.8" group="" part="0" file="vel_vec_4.vtr"/>
>>     <DataSet timestep="1.0" group="" part="0" file="vel_vec_5.vtr"/>
>>     <DataSet timestep="1.2" group="" part="0" file="vel_vec_6.vtr"/>
>>     <DataSet timestep="1.4" group="" part="0" file="vel_vec_7.vtr"/>
>>     <DataSet timestep="1.6" group="" part="0" file="vel_vec_8.vtr"/>
>>     <DataSet timestep="1.8" group="" part="0" file="vel_vec_9.vtr"/>
>>     <DataSet timestep="2.0" group="" part="0" file="vel_vec_10.vtr"/>
>>   </Collection>
>> </VTKFile>
>>
>>
>>  2- Click on my data and create a "Temporal Cache" with "Cache Size=2".
>>
>>  3- From "Sources", I create a "Line".
>>
>>  4- Click on TemporalCache1 and create a ParticleTracer.
>>      When the menu pops up, I choose
>>              a) Input: TemporalCache1
>>              b) Source: Line1
>>       Right after I click Ok, this is the message I get (note that this
>> message is shown even before giving me the chance to change any flags on
>> the "Properties" section related to the "ParticleTracer1".
>>
>> /home/utkarsh/Kitware/superbuild/paraview/src/paraview/VTK/Filtering/vtkStreamingDemandDrivenPipeline.cxx,
>> line 934
>>
>> vtkPVPostFilterExecutive (0x4db4870): No maximum number of pieces has
>> been set in the information for output port 0 on algorithm
>> vtkPVPostFilter(0x4777fd0).
>>
>>
>>    Luckily, Paraview does not crash and I can continue.
>> After doing some research, I am guessing that this has something to do
>> with the time conflicts (Pipeline fed into the filter and the animation
>> viewer time).
>>
>>  *Observation:* Right after I create the ParticleTracer and receive the
>> error message, the time shown in the animation viewer is increased from
>> "0.0" to "0.2". Why?
>>
>>  5- Recommended by the powerpoint, I set
>>          a) Time Step: True (1)
>>          b) Ignore Pipeline Time: True (1)
>>
>>
>>  6- Now, I use "Animation View" as directed by the same powerpoint to
>> feed the time into the ParticleTracer1 filter.
>>          a) Mode: Sequence
>>          b) Create a keyframe for "ParticleTracer1". Double click on the
>> bar and set:
>>                     1: time: 0.2, (interpolation ramp), value: 1
>>                     2: time: 1.8, (), value: 9
>>
>>  Note: I have varied all the combinations listed above to
>> include/exclude the last/first steps. No luck! Nothing really happening.
>>
>> 7- Play animation. Result: nothing happening? What is going on?
>>
>>
>>  *Observation: Using Paraview 3.8, I could see the animation without
>> adjusting any parameters in the "Animation View" menu. Just the annoying
>> error message was shown. However, I could do the same thing with Paraview
>> 3.14, but it crashes after a few timesteps. *
>> *
>> *
>> Anybody could share some hints on how to go about this?
>>
>>  Thanks,
>> Mohanad
>>
>>
>>
>>
>>
>>
>
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