[Paraview] Manually set UGrid point IDs for time-series plotting?

[David E DeMarle]

Sounds like a bug in the vtkXMLUnstructuredGridReader. Perhaps it  was
not updated to use vtkIdTypes. I will try to reproduce the bug and
look into it.

On 12/20/07, Eric Monson <emonson at cs.duke.edu> wrote:
> Hey Dave,
>
> I have now been able to successfully use the SetGlobalIds() method for
> my vtkUnstructuredGrid PointData, but there seem to be some issues
> with reading the *.vtu files into ParaView properly.
>
> ParaView recognizes that there are Global Ids set (the Use Global Ids
> check box becomes available in both the Plot Point Over Time and the
> Selection Inspector), but they don't seem to be valid for some reason.
> For example, when points are selected, the Selection Inspector shows
> the Index for the points, but if you check Use Global Ids the list
> goes blank (and plotting using these Global Ids doesn't work, and in
> the Selection Inspector if you try to uncheck Use Global Ids, ParaView
> crashes).
>
> ExodusII files seem to work fine in all these cases, but not VTK XML
> Unstructured Grids. If I save either box.ex2 or can.ex2 as a vtu file,
> then reload it, PV behaves just like with my data. (In case it helps,
> I noticed that the global IDs' Data Type are listed for ex2 files as
> "idtype", while they are listed as "int" for an unstructured grid
> loaded from a vtu file.)
>
> Any clues as to where the problem might lie (me, VTK, ParaView...)?
>
> Thanks,
> -Eric
>
>
> On Dec 13, 2007, at 11:04 AM, David E DeMarle wrote:
>
> > Hello,
> >
> > vtkDataSetAttributes::SetGlobalIds(vtkDataArray*da) will flag the
> > array of ids as "the ids" and then the plot over time filters will be
> > able to use them instead of using the index into the cell/point
> > arrays.
> >
> > hth,
> > Dave DeMarle
> >
> > On 12/13/07, Eric Monson <emonson at cs.duke.edu> wrote:
> >> Hello,
> >>
> >> I'm wondering if there is any way of manually setting point ID values
> >> within a vtkUnstructuredGrid? (I'm using Python to populate a UGrid
> >> from HDF5 data and then writing to *.vtu and *.pvd files for multiple
> >> time steps.)
> >>
> >> I'm visualizing a time series of points diffusing in a space, where
> >> some particles appear and disappear over time. This presents a
> >> problem
> >> when I want to plot with Extract Points Over Time, because the point
> >> "index" that ParaView sees isn't consistent (doesn't correspond to a
> >> single particle) over the whole time series.
> >>
> >> I have a scalar array of IDs associated with the point data, which I
> >> successfully use with John Biddiscombe's Temporal Trails Filter
> >> (since
> >> it has an option for using a scalar array for ID), but I don't know
> >> how to use that same info for XY plotting.
> >>
> >> I see that the ExodusII reader puts some global ID info into a
> >> vtkModelMetadata object and packs it into the UGrid field data.
> >> (Then,
> >> I'm guessing that the Extract Points Over Time might be able to sense
> >> this and "un-grey" the Use Global Ids check box...?) Is there any
> >> other way (besides using a vtkExodusIIReader) to do the equivalent
> >> process, such that the info will be viewable by the plotting
> >> routines?
> >>
> >> Thanks a lot,
> >> -Eric
> >>
> >> -----------------------------------------------------
> >> Eric E. Monson
> >> Duke Visualization Technology Group
> >>
> >>
> >> _______________________________________________
> >> ParaView mailing list
> >> ParaView at paraview.org
> >> http://www.paraview.org/mailman/listinfo/paraview
> >>
>
>