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

[Liang Wang]

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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