[Paraview] Particle tracer

Thu Apr 19 02:19:24 EDT 2012

If using a VTU works and a VTR crashes, then it's definitely a bug.

I've been working on temporal fixes for a long time (i.e. not working hard), and eventually I will commit something that resolves this, but in the meantime, you should use vtu.

JB

From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Mohamad M. Nasr-Azadani
Sent: 18 April 2012 22:09
To: Burlen Loring
Cc: paraview at paraview.org
Subject: Re: [Paraview] Particle tracer

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<mailto: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=15 however 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<mailto: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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