[Paraview] StreamTracer: Combined ReasonForTermination or select individual polylines?

[Liang Wang]

A follow-up question: How to perform the `Find Data` by `criteria` in
Python? I tried to record a macro but only got

extractSelection1 = ExtractSelection(Input=tube1,
    Selection=None)

On Tue, Mar 14, 2017 at 3:47 PM, Liang Wang <frank0734 at gmail.com> wrote:

> Thank you, Andy.
>
>
> I):
>
> I'm using 5.3 and your example is what I would get. But what I want is a
> way to tell if the two streamlines from the same seed point are terminated
> for different reasons. It might be more clear from the image I attached. I
> would like to tell
>
> 1) closed field lines that have both ends terminated on the sphere surface
> (the red tubes)
> 2) semi-open field lines that have on the ends terminated on the sphere
> surface, the other goes out-of-domain (the red and blue tubes)
> 3) open field lines that have both ends out-of-bound (not shown in the
> image, would be blue tubes)
>
> (Or, ideal, I would be happier to be able to tell if the open end of the
> semi-open field lines goes out of the southern or northern bound)
>
> Indeed, I saw people doing this in Mayavi-based python (see
> https://github.com/KristoforMaynard/Viscid/blob/
> dev/viscid/cython/streamline.pyx and http://kristoformaynard.
> github.io/Viscid/docs/master/examples/mayavi.html). One obstacle I can
> see is that ParaView (or vtk?) probably treats the two streamlines from the
> same seed point independently, thus it won't be easy to tag them together.
>
> II):
>
> I realize that I am demanding too much. I tried your way of `Find Data`,
> and now I am able to manually choose individual streamlines, which is
> already helpful.
>
>
>
> On Tue, Mar 14, 2017 at 3:17 PM, Andy Bauer <andy.bauer at kitware.com>
> wrote:
>
>> Hi,
>>
>> What version of ParaView are you using?
>>
>> From my testing it looks like each direction for the stream tracer seeds
>> has a separate reason for termination in PV 5.3 -- see the attached image.
>> The domain is a box with length 20 on each side, the velocity is [1, 0, 0],
>> the seeds are a line source going from min to max of the bounding box
>> ([-10, -10, -10] to [10,10,10]).  The red is for when the maximum
>> streamline length has exceeded my specified max length of 5 and the blue is
>> for when the streamline exited the domain.
>>
>> Is there a case where the same reason for termination value is being used
>> for multiple termination criteria?
>>
>> You can use the SeedIds cell data array in the Threshold filter or use
>> the Edit->Find Data option to select a given streamline from the seed id.
>>
>> Cheers,
>> Andy
>>
>>
>>
>> On Tue, Mar 14, 2017 at 2:24 PM, Liang Wang <frank0734 at gmail.com> wrote:
>>
>>> If the IntegrationDirection is set to BOTH, the two segments of the
>>> streamlines from the seed might terminate for different reasons. For
>>> example, one end might end due to STAGNATION, the other due
>>> to OUT_OF_DOMAIN. When coloring by ReasonForTermination, then the two
>>> segments are colored differently.
>>>
>>> My question is: Can a user create more cases of ReasonForTermination so
>>> that we can tell examples like above? Or, how can I select individual
>>> streamlines by its SeedIds (I tried IdsSelection, but that appears to work
>>> for cell/point data only, not for polydata?)
>>>
>>> My current solution is to use threshold filter to select lines in the
>>> different regions and apply different solid colors. But it would be nice if
>>> I can handle a few different cases more directly, even if that involves
>>> some coding in C++ or Python.
>>>
>>> Thanks.
>>>
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>
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