[Paraview] visualize traced particles

[Cory Quammen]

David,

It is subtle, but the reason is that the Threshold filter works only
on data with cells, not directly on points. The typical solution is to
apply the Glyph filter, then the Threshold filter.

There really should be a Threshold Points filter in ParaView because
this comes up time and time again.

Thanks,
Cory

On Mon, Jun 13, 2016 at 10:12 AM, David Larsson
<david.larsson at sth.kth.se> wrote:
> Hi Cory,
>
> thanks for the helpful info.
>
> As an initial test step, I loaded the traced particles as a csv table and converted the spatial coordinates to data points (as you suggested). I can then see time as a variable in the scroll list gui, also enabling me to see different time points as different colors (i.e. with differently annoted values), as seen in the attachment.
>
> What I would like to is to select a given time points and see where my particles are at that time. I thought that would be easily achievable with a "Threshold" filter, but even though I can see that the time data range spans (in this case) [0.478, 0.522], whenever I threshold within that time (e.g. [min, max]: [0.478, 0.5]) all my particles disappear. Do you know why that is? Or is there another way I could do to select a specified time step?
>
> I've also added the actual csv-file if that helps.
>
> Thansk for all suggestions,
>
> /David
>
> ________________________________________
> Från: Cory Quammen <cory.quammen at kitware.com>
> Skickat: den 8 juni 2016 16:45
> Till: David Larsson
> Kopia: paraview at paraview.org
> Ämne: Re: [Paraview] visualize traced particles
>
> David,
>
> Sure, this is possible. To view pathlines, you'll need to either write
> a kind of file reader, probably a python Programmable Source, or
> convert your file into a format ParaView can read, such as an XML
> polydata file. The pathlines can be stored as vtkPolyLine cells in a
> vtkPolyData.
>
> If you just want to view the particles, you can likely read the file
> directly using the CSV reader. Assuming your data is in the format
>
> x y z t
>
> the file will be read as a table. You'll need to convert the table to
> points using the Table to Points filter. Choose the X, Y, and Z
> columns for your data. The time column will be added as a variable
> associated with the point.
>
> HTH,
> Cory
>
> On Thu, Jun 2, 2016 at 5:26 PM, David Larsson <david.larsson at sth.kth.se> wrote:
>> Dear Paraview community,
>>
>>
>> in an external program, I've traced particles inside a 3D(+time) flow field
>> and extracted each particles spatial position (x,y,z) in time.
>>
>>
>> I have this data saved in an ascii-output where each particle position (with
>> time) is simply written out.
>>
>>
>> Now to my question: is there any convenient way of visualizing these
>> pathlines in paraview? Can I load and look at that kind of data in a direct
>> way? Or can you even visualize how the particle progresses in space over
>> time?
>>
>>
>> Thanks for your help.
>>
>>
>> /David
>>
>>
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>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.



-- 
Cory Quammen
R&D Engineer
Kitware, Inc.