[Paraview] Programmable Source & MultiBlockDataSet

Mon Apr 26 06:10:07 EDT 2010

... I answer myself : I have to use the req_timestep variable, and do
something like

> ModulePerso.ReadMultiBlockFromV3D(*'filename%s'%(req_timestep)*)

If that could help other people, there is on the internet a presentation
that explains quite well how time is managed in Paraview, especially slide
32.
http://www.itk.org/Wiki/images/2/20/IEEE08_Time-In-ParaView.ppt

Le 26 avril 2010 10:39, Aurélien Marsan <aur.marsan at gmail.com> a écrit :

> Thank for this example.
>
> But I'm trying to apply this to my case, and have one question again .....
> :-|
>
>  # TODO: Generate the data as you want.
>
> ---> That should be the DataSet at one timestep ?
> How does the programmable source handle the change of the filename to read
> ?
> Should I use a command sort of "executive.GetActiveTimeStep()" when I
> define the filename to read ?
>
> Le 23 avril 2010 20:48, Utkarsh Ayachit <utkarsh.ayachit at kitware.com> a
> écrit :
>
>> I've added an example to the Wiki showing how to produce timesteps
>> from programmable source.
>>
>> http://www.paraview.org/Wiki/Here_are_some_more_examples_of_simple_ParaView_3_python_filters.#Producing_Data_with_Timesteps_.28Source.29
>>
>> There's one caveat currently. The GUI does not realize the timesteps
>> being produced, so you will have to manually adjust the time ranges
>> for the animation using the Animation View.
>>
>> Utkarsh
>>
>> 2010/4/23 Aurélien Marsan <aur.marsan at gmail.com>:
>> > Yet I understand why it's not possible to work with TemporalDataSet in
>> > Paraview.
>> > The output of the PVDReader is a MultiBlockDataSet, and the PVDReader
>> > redirect the reader based on the time value.
>> >
>> > ... Is it possible to create a programmable source that would be aware
>> of
>> > the timestep ?
>> > Or do I have to abandon python and write a reader in the C++ source ?
>> >
>> > Le 23 avril 2010 17:15, Aurélien Marsan <aur.marsan at gmail.com> a écrit
>> :
>> >>
>> >> ah....
>> >>
>> >> So : I use file in format v3d.
>> >> For a mesh that contains two blocks, they would be called called
>> >> block1_timestep1.v3d, block2_timestep1.v3d, block1_timestep2.v3d,
>> >> block2_timestep2.v3d, etc...
>> >>
>> >> Actually, I open these v3d_files with a python tool that I have
>> >> writen, translate them as vtk.vtkStructuredGrid, and write several
>> files on
>> >> the disk as TimeStep1.vtm, TimeStep2.vtm and Simulation.pvd
>> >> But this takes a lot a disk space, and reading/writing takes a lot of
>> >> time.
>> >>
>> >> So I would like to open the v3d file directly in paraview.
>> >> That's why I though to use a Programmable Source in order to read all
>> v3d
>> >> files and create a "Temporal Data Set".
>> >>
>> >> Le 23 avril 2010 16:35, Utkarsh Ayachit <utkarsh.ayachit at kitware.com>
>> a
>> >> écrit :
>> >>>
>> >>> Temporal DataSet! Filters shouldn't be producing temporal dataset
>> >>> explicitly. Why do you need it?
>> >>>
>> >>> Utkarsh
>> >>>
>> >>> 2010/4/23 Aurélien Marsan <aur.marsan at gmail.com>:
>> >>> > thanks !
>> >>> > And so, could you add "Temporal Data Set" to this commit ?
>> >>> > Le 23 avril 2010 16:28, Utkarsh Ayachit <
>> utkarsh.ayachit at kitware.com> a
>> >>> > écrit :
>> >>> >
>> >>> >> I've just committed a change to ParaView to allow setting output
>> type
>> >>> >> to be a multiblock dataset.
>> >>> >>
>> >>> >> Commit id: c7472789ba86210e190f398a90eebc081a66d40c
>> >>> >>
>> >>> >> Utkarsh
>> >>> >>
>> >>> >> 2010/4/23 Aurélien Marsan <aur.marsan at gmail.com>:
>> >>> >> > I found a solution to do what I wanted to do. Not really elegant,
>> >>> >> > but it
>> >>> >> > works.
>> >>> >> > The best would be to encode the reader in the source code.... but
>> I
>> >>> >> > don't
>> >>> >> > know how to do, and have no time for now.
>> >>> >> >
>> >>> >> > First, I use the tool Source -> Data Object Generator, and create
>> a
>> >>> >> > MultiBlockDataSet.
>> >>> >> >>
>> >>> >> >> MB{}
>> >>> >> >
>> >>> >> >
>> >>> >> > Then, I use a Programmable Filter, and set the Output Data Type
>> >>> >> > "Same as
>> >>> >> > Input".
>> >>> >> > So I can use this script.
>> >>> >> >
>> >>> >> >>
>> >>> >> >> from Moduleperso import *
>> >>> >> >> m = MultiBlocFromV3D(........)       # This is a personnal
>> reader
>> >>> >> >> in
>> >>> >> >> python, that returns a vtkMultiBlockDataSet
>> >>> >> >> self.GetOutputDataObject(0).DeepCopy(m)
>> >>> >> >
>> >>> >> >
>> >>> >> > Hope this will help some people who don't want to go in source
>> >>> >> > code...
>> >>> >> >
>> >>> >> > Le 23 avril 2010 14:07, Aurélien Marsan <aur.marsan at gmail.com> a
>> >>> >> > écrit :
>> >>> >> >>
>> >>> >> >> Maybe I have found a way to avoid the Programmable Source...
>> >>> >> >>
>> >>> >> >> But Is it possible to export an object created in the python
>> shell
>> >>> >> >> directly into the pipeline of the paraview interface ?
>> >>> >> >>
>> >>> >> >> Le 22 avril 2010 15:36, Aurélien Marsan <aur.marsan at gmail.com>
>> a
>> >>> >> >> écrit
>> >>> >> >> :
>> >>> >> >>>
>> >>> >> >>> Hi,
>> >>> >> >>>
>> >>> >> >>> A new thing I don't know how to do with Paraview.
>> >>> >> >>> I have written a personnal reader, that creates
>> vtkStructuredGrid
>> >>> >> >>> from
>> >>> >> >>> files written in so called format "v3d". So I'm able to
>> construct
>> >>> >> >>> a
>> >>> >> >>> MutliBlockDataSet, that is composed of all the Blocks I'm
>> working
>> >>> >> >>> with.
>> >>> >> >>>
>> >>> >> >>> I would like to use "Programmable Source", so we don't need to
>> >>> >> >>> write
>> >>> >> >>> the
>> >>> >> >>> file on the disk before to open it with Paraview.
>> >>> >> >>> Does "Programmable Source" work with MultiBlockDataSet ? I
>> don't
>> >>> >> >>> see
>> >>> >> >>> this
>> >>> >> >>> class in the Output Data Set Type that we can choose...
>> >>> >> >>>
>> >>> >> >>> And is it correct if I write in the Script of the Programmable
>> >>> >> >>> Filter
>> >>> >> >>> :
>> >>> >> >>>
>> >>> >> >>> from perso import *
>> >>> >> >>> multiblock = MultiBlockDataSetFromV3D(.....)
>> >>> >> >>> self.GetOutput().DeepCopy(multiblock)
>> >>> >> >>>
>> >>> >> >>> Thanks for help.
>> >>> >> >>>
>> >>> >> >>> A.MARSAN
>> >>> >> >
>> >>> >> >
>> >>> >> > _______________________________________________
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>> >>> >
>> >>> >
>> >>
>> >
>> >
>>
>
>
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