[vtkusers] VTK Time support

[Dan Lipsa]

Evan,
Probably the easiest route is to directly use ParaView from python, instead
of trying to replicate ParaView behavior using VTK.

Checkout
http://www.paraview.org/paraview-guide/

You'll have to use pvpython so checkout all sections that mention this in
their title. For instance section 2.2.1 deals with temporal file series.

Dan



On Fri, May 22, 2015 at 4:17 PM, Evan Kao <tossin at gmail.com> wrote:

> Hello Dan,
>
> Thanks for the info.  In this case, the VTK counterparts seem to be
> straightforward, but I think there might be something going on in Paraview
> behind the scenes that I don't understand, especially since not all readers
> seem to be able to handle time-dependent data.
>
> For instance, reading in time-dependent EnSight data into ParaView and
> applying the Temporal Interpolator filter is pretty trivial.  But I can't
> figure out how to replicate this in VTK using the related filters
> vtkGenericEnSightReader and vtkTemporalInterpolator, since the former
> doesn't seem to innately read time series (it will can 1 timepoint at a
> time).
>
> I'm specifically wondering if I can there is a reader and corresponding
> data format that exists that would allow me to simply use its output as the
> input to a streaming filter like:
>
> reader = vtk.vtkSomeReader()
> reader.SetFileName(filename)
> ti = vtk.vtkTemporalInterpolator()
> ti.SetInputConnection(reader.GetOutputPort())
> ti.Update()
>
> But it seems like I probably can't avoid learning the VTK Pipeline and
> using vtkPythonAlgorithm or vtkProgrammableSource/Filter.
>
>
> On a related note, in my attempts to emulate some Paraview features, I've
> tried playing around with some of Paraview-specific VTK classes by
> importing from paraview.pvvtkextensions, but I get a TypeError ("method
> requires a VTK object") when I attempt to mix and match VTK objects that
> were created using another VTK library, e.g.:
>
> import paraview.pvvvtkextensions as pvvtk
> import vtk
>
> a = pvvtk.vtkPGenericEnsightReader()
> b = vtk.vtkTemporalInterpolator()
> b.SetInputConnection(a.GetOutputPort())
>
> TypeError: SetInputData argument 1: method requires a VTK object
>
> I noticed this occurs when I try to mix and match VTK versions (e.g. 6.1
> and 5.10), but in this case, both versions of VTK are the same (6.1).
> Paraview and VTK were both installed using binaries.  Why does this occur,
> and is there a way to avoid this?
>
> Thanks,
> Evan Kao
>
> On Fri, May 22, 2015 at 7:07 AM, Dan Lipsa <dan.lipsa at kitware.com> wrote:
>
>> You can see the vtk class used by a particular ParaView filter in
>> ./ParaViewCore/ServerManager/SMApplication/Resources/filters.xml
>>
>> Search for the filter name in name="..." attribute, the class will be
>> specified in class="...".
>> There is also a readers.xml file in the same folder to look for readers.
>>
>> Dan
>>
>>
>>
>> On Thu, May 21, 2015 at 6:45 PM, Evan Kao <tossin at gmail.com> wrote:
>>
>>> Thanks for the explanation.  I had another related question when it
>>> comes to reading (and possibly writing) data as a time series.  Is it
>>> possible to emulate in VTK say a very simple Paraview pipeline, where I
>>> basically just apply 2 classes, a reader and a streaming filter e.g. the
>>> equivalent of File > Open, Filters > Temporal Interpolator in Paraview?
>>> And if so, which readers/file formats could work?
>>>
>>
>>
>
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