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

[Eric Monson]

Hey Dave,

Thanks for the answer -- I hadn't seen that one before.

That would solve it, but the SetGlobalIds method (for vtkPointData or  
vtkDataSetAttributes) doesn't seem to be available in the Python  
wrappers.

Does anyone know how to set the global Id attribute from Python?

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
>>
>>
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