[Paraview] Combination of polygonal-data and unstructured grid?

[Armin Wehrfritz]

Hi Stefan,

IIRC there is a .vtu file containing polyhderal cells in the VTK DATA
repository.

Otherwise, I attached a .xmf and a .vtu file containing each containing
identical data, i.e. 2 hexahedral and 2 polyhderal cell.
Please note that the white-space in these files has no meaning, and that
for the .xmf file you need a recent ParaView nightly build.

Best regards,
Armin





On 09/27/2016 07:42 AM, Stefan Melber wrote:
> Hi Armin,
>
> sounds thats the thing i searched for! Will check it out today and see
> if it does the job. Is there a demo-xml file around with such polyhedral
> cells?
>
> Best regards and thank you,
>
>       Stefan
>
>
>> Hi Stefan,
>>
>> If I understand your problem correctly, then you are looking for
>> polyhedral cells (i.e. N face cells, where each face is a M edge
>> polygon). Polyhedral cells are commonly used in Computational Fluid
>> Dynamics codes, as e.g. OpenFOAM, and VTK/ParaView support them already
>> for quite some time (i.e. since around 2010), see [1] for more details.
>>
>>> My problem is now i have a set of complex shaped volumes (dual-grid
>>> data) which cannot be found in the list of cell types for
>>> unstructured grid data. Therefore i use the polygonal data and color
>>> each cell with one color. Of course for further analysis (e.g.
>>> integration of the cell volumes, volume gradient and so on) i need a
>>> way to give a set of (closed surface) poly-data elements a kind
>>> connection to form a volume to handle them together.
>> In which file format do you store your data?
>>
>> For example, the unstructured VTK XML format [2] has support for
>> polyhedral cells. An alternative would be the XDMF file format [3] to
>> which I recently added polyhedral cell support [4,5]. Please note that
>> the latest release versions of VTK (7.0) or ParaView (5.1) don't support
>> the polyhedral cells in XDMF yet, but the nightly builds and the
>> upcoming releases (i.e. VTK 7.1 and ParaView 5.2) will have this feature.
>>
>> Cheers,
>> Armin
>>
>>
>> [1] http://www.vtk.org/Wiki/VTK/Polyhedron_Support
>> [2] http://www.vtk.org/Wiki/VTK_XML_Formats
>> [3] http://www.xdmf.org
>> [4]
>> https://gitlab.kitware.com/xdmf/xdmf/commit/0a9fbd0590dff8a677c86754169cd2ccd72fe4b1
>>
>> [5]
>> https://gitlab.kitware.com/vtk/vtk/commit/802c9b61de28e560c2659d2af76660bbb49c68be
>>
>>
>>
>
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