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

[David E DeMarle]

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
>