[Paraview] Particle tracer

Fri Apr 20 08:23:52 EDT 2012

Berk,

Could you spare a minute to let me know what changes you are making.  I don't see how you can the interface more usable, since it is already great :)
[My own copies has changed quite a bit (I need to finish the temporal rework of the pipeline as well, everything is broken at the moment - and the modular changes will make things much worse - I only have stuff for the old VTK, not the modular version. Will everything be horribly broken when I switch to the modular version)]

JB

From: paraview-bounces at paraview.org [mailto:paraview-bounces at paraview.org] On Behalf Of Berk Geveci
Sent: 19 April 2012 22:30
To: Mohamad M. Nasr-Azadani
Cc: paraview at paraview.org
Subject: Re: [Paraview] Particle tracer

Leo and I will have an answer for you guys soon. FYI we just started working on the particle tracker with the purpose of cleaning it up as well as making its interface easier to use.

Best,
-berk
On Wed, Apr 18, 2012 at 4:08 PM, Mohamad M. Nasr-Azadani <mmnasr at gmail.com<mailto:mmnasr at gmail.com>> wrote:
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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