[vtkusers] vtkExodusIIReader: Extract time step value?

[Nico Schlömer]

This

from vtk import *
rdr = vtkExodusIIReader()
rdr.SetFileName('/path/to/ParaViewData/Data/can.ex2')
rdr.Update()
rdr.GetOutputInformation(0)

yields and error saying that "GetOutputInformation" isn't a member of
vtkExodusIIReader.
>From <http://www.vtk.org/doc/nightly/html/classvtkExodusIIReader-members.html>
I see that it should be there though. Might this be a bug in the
Python interface? This is with VTK 5.8.0.

--Nico



On Sat, Sep 8, 2012 at 6:26 PM, David Thompson
<david.thompson at kitware.com> wrote:
> Hi Nico,
>
>> after having read a particular (integer) time step from an Exodus file
>> with the vtkExodusIIReader,
>> http://www.vtk.org/doc/nightly/html/classvtkExodusIIReader.html, how
>> do I extract the actual (float/double) time value that's associated
>> with it?
>
>
> Filters that generate temporal data should set the vtkStreamingDemandDrivenPipeline::TIME_STEPS() key on their corresponding output's vtkInformation object. Access to any vtkAlgorithm's output information is available via the GetOutputInformation() method.
>
> Using the exodus reader on can.ex2 as an example, here's a vtkpython script to get time step information:
>
> from vtk import *
> rdr = vtkExodusIIReader()
> rdr.SetFileName('/path/to/ParaViewData/Data/can.ex2')
> rdr.Update()
> rdr.GetOutputInformation(0).Get(vtkStreamingDemandDrivenPipeline.TIME_STEPS())
>
> This returns a vector of doubles. You can use the integer time step as an index into the vector.
>
>         David