In Python you can do something like create a Threshold filter to # create a new 'Threshold'
threshold1 = Threshold(Input=streamTracer1) threshold1.Scalars = ['CELLS', 'SeedIds'] threshold1.ThresholdRange = [1.0, 2.0] threshold1.CellData['ReasonForTermination'].GetRange() This will give you the range of values in the threshold output for the ReasonForTermination array. You can query the number of seeds for the high resolution line source with <streamtracer>.SeedType.Resolution On Tue, Mar 14, 2017 at 4:31 PM, Liang Wang <frank0...@gmail.com> wrote: > 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 <frank0...@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.ba...@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 <frank0...@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. >>>> >>>> _______________________________________________ >>>> Powered by www.kitware.com >>>> >>>> Visit other Kitware open-source projects at >>>> http://www.kitware.com/opensource/opensource.html >>>> >>>> Please keep messages on-topic and check the ParaView Wiki at: >>>> http://paraview.org/Wiki/ParaView >>>> >>>> Search the list archives at: http://markmail.org/search/?q=ParaView >>>> >>>> Follow this link to subscribe/unsubscribe: >>>> http://public.kitware.com/mailman/listinfo/paraview >>>> >>>> >>> >> >
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