[Paraview] SWKey: Help with VTK XML-Formatted "Writer" Routine.

[Samuel Key]

Hi Armin,

Thanks for pointing me to the relevant VTK Wiki page!

The information there cleared up my questions about how to incorporate 
an arbitrary n-vertex polyhedral finite element into the VTK 
XML-structured results file for ParaView.

My delayed reply can be attributed to the maelstrom of counters I had to 
introduce into my existing VTK XML Writer. It took a lot of time to get 
everything right. (Luckily, my software has an EnSight Writer that 
handles polyhedral finite elements and I was able to get ParaView to 
convert the 7-cell test mesh into a muti-block *.vtm collection for 
comparison.)

Regards,

Samuel Key
FMA Development, LLC
1005 39th Ave NE
Great Falls, Montana 59404
USA

On 2/17/2016 2:48 PM, Armin Wehrfritz wrote:
> On this wiki page you find information on how polyhedrons are stored 
> in unstructured XML files (search the page for vtkXMLUnstructuredGrid):
> http://www.vtk.org/Wiki/VTK/Polyhedron_Support
>
> Hope it helps.
>
> -Armin
>
>
>
> On 02/17/2016 09:59 PM, Samuel Key wrote:
>> My simulation software has a functioning VTK XML-formatted, "ascii"
>> output routine. To facilitate datum set transfers, I want to add
>> arbitrary, m-vertex polyhedral finite elements to the simulation
>> software's existing Writer (VTK_POLYHEDRON = 42).
>>
>> Originally, I used the VTK File Formats Version 4.2 to construct the
>> program's Writer. It is not clear to me what the XML structures should
>> contain with respect to the polyhedral finite elements.
>>
>> Three files are attached: (1) *.inp is an input snippet for a polyhedral
>> finite element used by the simulation software, (2) *.png is a ParaView
>> screenshot display for this polyhedron read in from an EnSight-formatted
>> file, and (3) *.vtu is a ParaView 'Save Data' output file for this
>> polyhedral finite element.
>>
>> Referring to the *.vtu file, I am having difficulty relating the
>> simulation software's and  EnSight's corresponding input description to
>> the ParaView output description, particularly, "connectivity" and 
>> "faces."
>>
>> Do you have any advice on how I should proceed?
>>
>> Note: The simulation software does not require the polygon faces to be
>> planar, nor the polyhedron volume to be convex. The simulation software
>> computes proper mean quadrature gradient/divergence operators for
>> non-planar facets and a restricted form of polyhedral star-convexity.
>>
>> Thanks in advance for the indicating how I should continue,
>>
>> Samuel Key
>> FMA Development, LLC
>> 1005 39th Ave NE
>> Great Falls, Montana 59404
>> USA
>>
>>
>>
>>
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>
> Visit other Kitware open-source projects at 
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>
> Please keep messages on-topic and check the ParaView Wiki at: 
> http://paraview.org/Wiki/ParaView
>
> Search the list archives at: http://markmail.org/search/?q=ParaView
>
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