[Paraview] ParaView Digest, Vol 166, Issue 7

Thu Feb 8 06:58:27 EST 2018

come on! I've unsubscribed 3 times now, why do I still get these mails???

Richard Ott
ETH Zürich
PhD student

Sonneggstrasse 5

8092 Zürich

+41 44 633 89 06
richard.ott at erdw.ethz.ch

________________________________________
Von: ParaView [paraview-bounces at paraview.org]" im Auftrag von "paraview-request at paraview.org [paraview-request at paraview.org]
Gesendet: Mittwoch, 7. Februar 2018 18:00
An: paraview at paraview.org
Betreff: ParaView Digest, Vol 166, Issue 7

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Today's Topics:

   1. file naming of downloadable data files (th.lauke at arcor.de)
   2. Re: PythonFullExample does not send any data (Andy Bauer)
   3. Re: Using Probe Filter To Get The Average Value Around A
      Point (Jeremias Gonzalez)
   4. Re: Using Probe Filter To Get The Average Value Around A
      Point (Moreland, Kenneth)

----------------------------------------------------------------------

Message: 1
Date: Tue, 6 Feb 2018 18:32:54 +0100 (CET)
From: th.lauke at arcor.de
To: paraview at paraview.org
Subject: [Paraview] file naming of downloadable data files
Message-ID: <173864583.16224.1517938374185 at mail.vodafone.de>
Content-Type: text/plain; charset=UTF-8

Hi all,

the data files https://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v5.4&type=binary&os=Sources&downloadFile=ParaViewData-v5.4.1.tar.gz e.g. have a confusing file naming :(

What's the intention for this? Thus I could hardly identify the wanted file :[

Many thanks for an explanation
Thomas

------------------------------

Message: 2
Date: Tue, 6 Feb 2018 17:40:40 -0500
From: Andy Bauer <andy.bauer at kitware.com>
To: "Michalke, Simon" <simon.michalke at fau.de>
Cc: paraview at paraview.org
Subject: Re: [Paraview] PythonFullExample does not send any data
Message-ID:
        <CAMaOp+ErfV4gB9sd9Aft+902jJVkn7dhimiThbzOO2Qa3T-nJg at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi Simon,

I'm confused a to where the data is being sent from and to. If it's from
the simulation and to the adaptor then all of that would get done before
Catalyst would ever see it. If it's from the adaptor to Catalyst or to the
PV GUI through the Live connection you'll probably want to look at
coprocessing.py and grep through it for "live". I don't look too often at
the Live sections of the code so it would take a bit of time to go through
all of the details on it properly.

Best,
Andy

On Tue, Feb 6, 2018 at 10:44 AM, Michalke, Simon <simon.michalke at fau.de>
wrote:

> Thank you very much, it works now.
>
> Since I am getting the initial data via http and process it manually, is
> there a way to "directly" open a connection and send data? I think the
> coprocessor structure is not suitable for my case. Something like:
>
> con = openConnection()
>
> con.sendData(data)
> con.sendData(data)
> con.sendData(data)
>
> con.close()
>
> where data is something like vtkPolyData. Or, alternatively transfer the
> grid at the beginning and only send the data as vtk*Array itself after
> first initialization.
>
> Cheers,
> Simon
>
>
> Am 2018-02-06 14:18, schrieb Andy Bauer:
>
>> In  cpscript.py you will need to change the following line:
>> coprocessor.EnableLiveVisualization(False, 1)
>>
>> to:
>> coprocessor.EnableLiveVisualization(True, 1)
>>
>> As for building VTK objects through the Python API, the VTK Examples at
>> https://lorensen.github.io/VTKExamples/site/Python/ should have several
>> will help you out.
>>
>> Cheers,
>> Andy
>>
>> On Tue, Feb 6, 2018 at 4:37 AM, Michalke, Simon <simon.michalke at fau.de>
>> wrote:
>>
>> Hello,
>>>
>>> I am trying to code a tool to send live data from a simulation to
>>> paraview. I build my paraview with the latest superbuild and with system
>>> python (3.4m). Then I tried to run the "PythonFullExample". After
>>> un-commenting line 25 in fedriver.py:
>>> coprocessor.addscript("cpscript.py")
>>> the script still does not send any data. There are no error messages as
>>> well. I made sure that paraview is listening to the correct port.
>>>
>>> In general, I cannot find any python example on how to attach values to a
>>> poly element or a point.
>>>
>>> Regards,
>>> Simon Michalke
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Message: 3
Date: Tue, 6 Feb 2018 17:21:37 -0800
From: Jeremias Gonzalez <jgonzalez49 at ucmerced.edu>
To: "Moreland, Kenneth" <kmorel at sandia.gov>, ParaView
        <paraview at paraview.org>
Subject: Re: [Paraview] Using Probe Filter To Get The Average Value
        Around A Point
Message-ID: <607343c2-fbc3-6dfb-ec3d-0cc0182e51d7 at ucmerced.edu>
Content-Type: text/plain; charset=utf-8; format=flowed

Thank you very much for your explanations and suggestions. Responses
interspersed below.

On 2/5/2018 4:57 PM, Moreland, Kenneth wrote:
> Jeremias,
>
> When you set a radius and number of points in the probe filter, then the filter will randomly sample the volume within the defined sphere the number of times requested. The resulting values are the field values at those randomly sampled locations. >
> An easy way to get an average of your samples is to run the result of the probe filter through the descriptive statistics filter. Look at the "Statistical Model" table and it will report the mean value for each field. (Note that if you are using ParaView 5.4 there is a bug, #17627, that shows the Statistical Model table wrong by default. You have to also change the Composite Data Set Index parameter in the Display part of the properties panel to select only the Derived Statistics block.)
>
> A couple of caveats to this approach. First, because the sampling is random, don't expect the exact same answer every time you run it. Second, if one of the samples happens to lie outside of the mesh, that sample will be filled with 0's for all fields. That will throw off the average value.

Is there a probe setting that will simply grab all the points living in
the original mesh within the radius of the sphere I choose?

>
> That said, another approach you might want to take is to first filter the data in a way that blurs out the noise first. One way you can do that is to run the Point Volume Interpolator filter. Change the Kernel to something like Gaussian (the default Voronoi filter will not do the averaging that you want). Set the radius appropriately. You can then probe the resulting data set with a single value (radius 0) and immediate see the "averaged" result.
>
> -Ken

I don't seem to be finding any information on what exactly the Gaussian
kernel does with the data, so how close is it to the plain averaging I
would like it to be doing?

------------------------------

Message: 4
Date: Wed, 7 Feb 2018 02:45:33 +0000
From: "Moreland, Kenneth" <kmorel at sandia.gov>
To: Jeremias Gonzalez <jgonzalez49 at ucmerced.edu>
Cc: ParaView <paraview at paraview.org>
Subject: Re: [Paraview] Using Probe Filter To Get The Average Value
        Around A Point
Message-ID: <352A5591-BA22-4421-A2C3-1ADDA46D2F1D at sandia.gov>
Content-Type: text/plain; charset="utf-8"

As far as I know, there is no way to get the probe filter to get all points within a radius as you describe. You may instead consider the Point Data to Cell Data Filter. That will for each cell take the values of all attached points and average them.

The point volume interpolator filter will create a grid (by default 100^3) and, in gaussian kernel mode, will ?splat? a gaussian function onto the grid from every point. Another way to think of it is that a 3D gaussian function is convolved with a 3D function comprising an impulse function at every point in the mesh scaled by the field value (and then sampled on the grid).

-Ken

Sent from my iPad

> On Feb 6, 2018, at 8:21 PM, Jeremias Gonzalez <jgonzalez49 at ucmerced.edu> wrote:
>
> Thank you very much for your explanations and suggestions. Responses interspersed below.
>
>> On 2/5/2018 4:57 PM, Moreland, Kenneth wrote:
>> Jeremias,
>> When you set a radius and number of points in the probe filter, then the filter will randomly sample the volume within the defined sphere the number of times requested. The resulting values are the field values at those randomly sampled locations. >
>> An easy way to get an average of your samples is to run the result of the probe filter through the descriptive statistics filter. Look at the "Statistical Model" table and it will report the mean value for each field. (Note that if you are using ParaView 5.4 there is a bug, #17627, that shows the Statistical Model table wrong by default. You have to also change the Composite Data Set Index parameter in the Display part of the properties panel to select only the Derived Statistics block.)
>> A couple of caveats to this approach. First, because the sampling is random, don't expect the exact same answer every time you run it. Second, if one of the samples happens to lie outside of the mesh, that sample will be filled with 0's for all fields. That will throw off the average value.
>
> Is there a probe setting that will simply grab all the points living in the original mesh within the radius of the sphere I choose?
>
>> That said, another approach you might want to take is to first filter the data in a way that blurs out the noise first. One way you can do that is to run the Point Volume Interpolator filter. Change the Kernel to something like Gaussian (the default Voronoi filter will not do the averaging that you want). Set the radius appropriately. You can then probe the resulting data set with a single value (radius 0) and immediate see the "averaged" result.
>> -Ken
>
> I don't seem to be finding any information on what exactly the Gaussian kernel does with the data, so how close is it to the plain averaging I would like it to be doing?

------------------------------

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