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

[Samuel Key]

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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  PHEL   1,99, 1, 1 =  1  2  3  4  5  6 $ PHEL's  POLYG n-tuple
  POLYG  1  1  1  1,4,20,3,2,17         $ POLYG's POINT m-tuple
  POLYG  2  1  2  2,3,7,6
  POLYG  3  1  3  5,18,6,7,19,8
  POLYG  4  1  4  1,5,8,4
  POLYG  5  1  5  1,17,2,6,18,5
  POLYG  6  1  6  3,20,4,8,19,7
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<VTKFile type="UnstructuredGrid" version="1.0" byte_order="LittleEndian" header_type="UInt64">
  <UnstructuredGrid>
    <Piece NumberOfPoints="12" NumberOfCells="1">
      <PointData>
      </PointData>
      <CellData>
      </CellData>
      <Points>
        <DataArray type="Float32" Name="Points" NumberOfComponents="3" format="ascii" RangeMin="0.46457400363" RangeMax="1.2312306844">
          0.24899999797 0.34200000763 0.19200000167 0.8259999752 0.2879999876 0.2879999876
          0.85000002384 0.64899998903 0.26300001144 0.27300000191 0.75 0.23000000417
          0.31999999285 0.18600000441 0.64300000668 0.67699998617 0.30500000715 0.68300002813
          0.7879999876 0.6930000186 0.6439999938 0.16500000656 0.74500000477 0.70200002193
          0.54750001431 0.21500000358 0.25 0.48849999905 0.45600000024 0.65299999714
          0.47650000453 0.71899998188 0.67299997807 0.56150001287 0.69999998808 0.24699999392
        </DataArray>
      </Points>
      <Cells>
        <DataArray type="Int64" Name="connectivity" format="ascii" RangeMin="0" RangeMax="11">
          0 3 11 2 1 8
          6 5 4 9 10 7
        </DataArray>
        <DataArray type="Int64" Name="offsets" format="ascii" RangeMin="12" RangeMax="12">
          12
        </DataArray>
        <DataArray type="UInt8" Name="types" format="ascii" RangeMin="42" RangeMax="42">
          42
        </DataArray>
        <DataArray type="Int64" Name="faces" format="ascii" RangeMin="0" RangeMax="11">
          6 6 0 3 11 2
          1 8 4 1 2 6
          5 6 4 9 5 6
          10 7 4 0 4 7
          3 6 0 8 1 5
          9 4 6 2 11 3
          7 10 6
        </DataArray>
        <DataArray type="Int64" Name="faceoffsets" format="ascii" RangeMin="39" RangeMax="39">
          39
        </DataArray>
      </Cells>
    </Piece>
  </UnstructuredGrid>
</VTKFile>