[vtkusers] problem creating a vtu file with a VTK polyhedron

[Bill Lorensen]

Try building this example and run with your data. For one thing, your
faces are ordered incorrectly.

https://lorensen.github.io/VTKExamples/site/Cxx/IO/ReadUnstructuredGrid/


On Sun, Dec 10, 2017 at 5:30 AM,  <JFSLB at gmx.de> wrote:
> Dear VTK users,
> I am trying to generate a vtu file that contains a single cell of type VTK_POLYHEDRON. The file I generated loads successfully in paraview but two edges of one face are not renderred correctly. The wireframe is displayed corretly. The cell consists of seven polygonal faces. I have made sure that the surface is water tight and that every edge is used exactly twice. I have also inverted the orientation of the polygons but that did not improve the situation.
>
> Can someone see an error in the vtu file below?
>
> Thanks!
>
>
>
> <VTKFile type="UnstructuredGrid" version="1.0" byte_order="LittleEndian" header_type="UInt64">
> <UnstructuredGrid>
> <Piece NumberOfPoints="10" NumberOfCells="1">
> <CellData Scalars="level">
> <DataArray type="Float32" Name="level" format="ascii" RangeMin="0" RangeMax="6">
> 0
> </DataArray>
> </CellData>
> <Points>
> <DataArray type="Float32" Name="Points" NumberOfComponents="3" format="ascii" RangeMin="-1" RangeMax="1">
> 0.0204729 -0.000857723 0.0396787
> 0.0206677 -0.000857723 0.038172
> 0.0212252 -0.000857723 0.038172
> 0.0212252 -0.000857723 0.0396787
> 0.0207424 0.0006489 0.038172
> 0.0207424 0.0006489 0.0387988
> 0.0206286 0.0006489 0.0396787
> 0.0212252 0.0006489 0.0396787
> 0.0212252 0.0006489 0.038172
> 0.0207501 -6.0656e-05 0.038172
> </DataArray>
> </Points>
> <Cells>
> <DataArray type="Int64" Name="connectivity" format="ascii" RangeMin="0" RangeMax="6">
> 0 1 2 3 4 5 6
> </DataArray>
> <DataArray type="Int64" Name="offsets" format="ascii" RangeMin="7" RangeMax="7">
> 7 </DataArray>
> <DataArray type="UInt8" Name="types" format="ascii" RangeMin="42" RangeMax="42">
> 42
> </DataArray>
> <DataArray type="Int64" Name="faces" format="ascii" RangeMin="0" RangeMax="9">
> 7
> 4 3 2 1 0
> 5 8 7 6 5 4
> 5 1 2 8 4 9
> 4 7 3 0 6
> 4 3 7 8 2
> 3 4 5 9
> 5 0 1 9 5 6
> </DataArray>
> <DataArray type="Int64" Name="faceoffsets" format="ascii" RangeMin="38" RangeMax="38">
> 38
> </DataArray>
> </Cells>
> </Piece>
> </UnstructuredGrid>
> </VTKFile>
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