[Paraview] Is it possible to group vtkImageData objects?

[Cory Quammen]

On Fri, Oct 20, 2017 at 10:10 AM, A . <super_achie at hotmail.com> wrote:

> Thanks for your reply. I can see this work for vtkImageData objects having
> the same dimensions. What would you advise when working with vtkImageData
> objects of varying dimensions? In that case the attribute data will not
> 'fit' a single vtkImageData object.
>
For that case, nothing comes to mind that will let you stored several
different vtkImageData objects in a single file. Even if a
vtkMultiBlockDataSet worked for your other needs, it would actually be
saved out as one .vti file for each block plus a top-level .vtm file that
points to the .vti files.

Sorry,
Cory


> Best,
>
> Jimmy
>
>
> ------------------------------
> *Van:* Cory Quammen <cory.quammen at kitware.com>
> *Verzonden:* vrijdag 20 oktober 2017 14:48
> *Aan:* A .
> *CC:* paraview at paraview.org
> *Onderwerp:* Re: [Paraview] Is it possible to group vtkImageData objects?
>
> Hi Jimmy,
>
> Try "Append Attributes". This will yield a single vtkImageData that has
> several point data arrays, or "attributes". As long as the input
> vtkImageData have the same dimensions, this filter will do what you like.
> You can then pick which array you want to view with the Volume
> representation.
>
> To extract a vtkImageData with one or a subset of the appended arrays, you
> can use "Extract Component" or "Pass Arrays", respectively.
>
> HTH,
> Cory
>
> On Fri, Oct 20, 2017 at 7:29 AM, A . <super_achie at hotmail.com> wrote:
>
>> Dear community,
>>
>>
>> Is it possible with ParaView to group vtkImageData objects in a single
>> file format? I would like to import a couple of regular grids (i.e.
>> vtkImageData objects) as a single file, rather than as grid_1.pvti,
>> grid_2.pvti, etc... Once imported I would like to simply select which grid
>> to visualize (with volume rendering).
>>
>>
>> I tried the following structures already:
>>
>>
>>
>>    1. vktMultiBlockDataSet containing N vtkImageData objects as child
>>    blocks.
>>    2. vtkMultiBlockDataSet containing 1 vtkMultiPieceDataSet, which
>>    contains N vtkImageData objects as child pieces
>>
>>
>> The first structure kind of works, but in order to visualize one
>> vtkImageData I need to "Extract Block" and "Resample to Image", which
>> doesn't result in the exact same image when doing volume rendering.
>> The second structure mixes my vtkImageData into a single data object. I
>> cannot do something like "Extract Piece".
>>
>> The main reason I want to have a single data structure containing all my
>> grids is so that I can pass it to my Python CoProcess Catalyst pipeline.
>> The number of grids can vary so I cannot simply hardcode the pipeline for a
>> fixed number of grids.
>>
>> If there is a way to make this work, please let me know!
>>
>> Best,
>> Jimmy
>>
>>
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>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>



-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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