[Paraview] Regarding filtering of point data array

[Cory Quammen]

Vaibhav,

It's a little involved, but you can filter with the Threshold filter
as Andrew recommends. Attached is a state file showing the pipeline.

First, we apply a Mask filter. We do not want to mask any points, so
we set the On Ratio to 1 and set the Maximum Number of Points to some
high number. The important part here is that we need to generate cells
that the Threshold filter can operate on. Hence we turn on the
Generate Vertices and Single Vertex Per Cell option.

Next, you create a Calculator filter to extract the X coordinate, then
filter the result with a Threshold filter applied to the X coordinate
array. The same is done for Y and Z.

You probably found that the Clip filter does this very quickly with a
box Clip Type setting, but for your application the Box parameters are
not very intuitive.

HTH,
Cory

On Tue, Nov 8, 2016 at 1:07 AM, Andrew <antech777 at gmail.com> wrote:
> Hello. Possibly Threshold filter will help you. To limit points by 3
> coordinates try to define 3 Threshold filters in series.
>
> 2016-04-03 18:55 GMT+03:00 Vaibhav Agrawal
> <vaibhav.agrawal at postgrad.curtin.edu.au>:
>>
>> Hi Paraview-Help,
>>
>> I am working on the DEM simulations of bubbling fluidized bed using
>> MFIX-DEM software.
>>
>> The output files of my simulations are of two type – one containing the
>> cell data such gas – volume fraction, pressure etc and other file containing
>> the point data such as particle positions and particle velocity. I want to
>> filter my point data file, on the basis of positions, i.e., I want to create
>> a subset of all the particles available at that time step, whose positions
>> (X,Y,Z) lies within a certain range ([Xmin, Xmax], [Ymin, Ymax], [Zmin,
>> Zmax]). For e.g. let’s suppose I have an point data array of size 20X7,
>> where my 2nd,3rd and 4th columns contains the X, Y, X position of particles.
>> I want to filter this point data array on the basis of particle position
>> (X,Y,Z) such that my new point data array will be smaller in dimension
>> (let’s say 6X7), and will have only those points, whose 2nd, 3rd, 4th column
>> contains the values which lies in the user defined range. I hope I am able
>> to define my problem clearly.
>>
>>
>>
>> I have tried using some filters like clip, slice etc, but didn’t worked
>> out well.
>>
>> Is there any way - filters/python script to do this? If yes, how should I
>> proceed to sort out my problem?
>>
>> For your reference, I am attaching here a raw file generated by MFIX-DEM,
>> which has a point data array, which I want to filter. Because of point data
>> array, you won’t see anything In the render view, but you’ll see the point
>> data array in Spreadsheet view
>>
>>
>>
>> Thanks and Regards
>>
>> Vaibhav Agrawal
>> PhD | Department of Chemical Engineering
>>
>> Faculty of Science and Engineering
>>
>> Curtin University
>> Mobile | +61451818978
>> Email | Vaibhav.Agrawal at postgrad.curtin.edu.au
>> Web | http://curtin.edu.au
>>
>>
>> Curtin University is a trademark of Curtin University of Technology.
>> CRICOS Provider Code 00301J (WA), 02637B (NSW)
>>
>>
>>
>>
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>
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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