[Paraview] Mesh edition / modification with paraview

[Cyril Giraudon]

Thanks a lot for this response Berk.

I will think about it. Not easy apparently.
The structured mesh edition (for FDTD purpose) is a particular task, and 
no library exists :-(.
I envisage to write an app based upon paraview, I need Paraview's large 
data handling capability.

Cheers,

Cyril Giraudon.


Berk Geveci a écrit :
>> Can the output of a filter be the input once modified and without a copy ?
>> (I don't want to create a new vtkDataSet each time an operation is executed)
>>     
>
> No, it can't. VTK is designed such that filters never change their
> input. Otherwise, the demand-driven pipeline paradigm breaks down.
>
> You can write a custom application based on VTK or ParaView that does
> not use the pipeline and can allow editing of meshes in place.
> However, this would probably take some significant amount of work.
> Another issue you would encounter is that VTK data structures are
> designed to be efficient in memory usage and time to setup but not for
> quick editing. This follows the demand-driven pipeline design.
>
> My recommendation would probably be to use VTK/ParaView in conjunction
> with another library that provides good support for mesh editing.
>
> Best,
> -berk
>
> On Mon, Feb 16, 2009 at 6:08 AM, cyril giraudon <cyril.giraudon at free.fr> wrote:
>   
>> Thanks David for your answer,
>>
>> Can the output of a filter be the input once modified and without a copy ?
>> (I don't want to create a new vtkDataSet each time an operation is executed)
>>
>> I'd like to handle a huge amount of data (1000^3 cubes minimum), is the
>> IO operation can be a problem for the save to disk task of the mesh ?
>>
>> Cheers,
>>
>> Cyril.
>>
>>
>> David E DeMarle a écrit :
>>     
>>> Yes.
>>>
>>> ParaView stores data in vtkDataSets, and each filter in ParaView takes
>>> in one or more vtkDataSets, looks at them, and produces one or more
>>> vtkDataSets (often by shallow copying the inputs).
>>>
>>> If you understand the vtkDataSet and vtkAlgorithm API's well enough,
>>> the operations you describe are fairly easy to accomplish. (See the
>>> python programmable filter wiki page for examples).
>>>
>>> However, providing a good UI that lets the user control which parts of
>>> the DataSet geometry and topology are modified is not altogether
>>> trivial. That would probably require significant use of vtkWidgets to
>>> create the visual editing tools, ParaView's Proxy/Property pattern to
>>> map the tools behavior over to the server side filter properties, and
>>> how ParaView's QT ObjectPanel interfaces exposes properties in the
>>> client application.
>>>
>>>
>>> On Fri, Feb 13, 2009 at 11:09 AM, Cyril Giraudon <cyril.giraudon at free.fr> wrote:
>>>
>>>       
>>>> Hello,
>>>>
>>>> Paraview is very well known in the data visualisation area.
>>>>
>>>> However, I'd like to know whether it is possible to write a plugin able to
>>>> modify a mesh, for instance to move a selected point of a mesh.
>>>> By extension, would it be possible to use paraview (with a new plugin) to
>>>> edit a structured orthogonal mesh in order to add/remove an edge, a face or
>>>> an element (a cube) ?
>>>>
>>>> Thanks a lot,
>>>>
>>>> Cyril Giraudon.
>>>>
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>>>
>>>
>>>       
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