[Paraview] visualize traced particles

[David Larsson]

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.
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