[Paraview] Write binary inline vtu file

[Burlen Loring]

It looks like you're running afoul of VTK specific terminology. the 
designers of the VTK XML file formats have done something confusing. 
They called the format that uses base64 encoding( 
http://en.wikipedia.org/wiki/Base64) "binary". There's an alternate 
format that can use raw binary encoding called "appended" where data 
arrays are stored at the end of the file. the "appended" format supports 
either base64 or raw binary encoding, while the "binary" format only 
supports base64.

This is documented in the file formats guide ( 
http://www.vtk.org/VTK/img/file-formats.pdf).

With your ascii formatted file you can use ParaView to generate examples 
of the other formats. Load your ascii formatted file and then use 
File->Save Data to save it as vtu in the desired format. I've done this 
to help refresh my memory about this, see the attached.

On 08/29/2013 06:01 AM, Matteo Parsani wrote:
> Dear ParaView users,
> I have succesfully written a ParaView writer to output an unstructured 
> grid data set. I am using Fortran 95.
> I am trying now to do exactly the same thing but writing Float64 
> binary file.
>
> In attachment tow example of output vtu file. The frist one is ascii 
> and I can read it with paraview. The second one is binary and I have 
> error when I read it.
>
> Any idea what's the problem?
>
> Thank you.
>
> Best Regards
>
>
>
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<VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
  <UnstructuredGrid>
    <Piece NumberOfPoints="4" NumberOfCells="1">
      <PointData>
      </PointData>
      <CellData>
      </CellData>
      <Points>
        <DataArray type="Float64" Name="Points" NumberOfComponents="3" format="binary" RangeMin="1.4142135624" RangeMax="1.4142135624">
          YAAAAAAAAAAAAPA/AAAAAAAA8L8AAAAAAAAAAAAAAAAAAPC/AAAAAAAA8L8AAAAAAAAAAAAAAAAAAPC/AAAAAAAA8D8AAAAAAAAAAAAAAAAAAPA/AAAAAAAA8D8AAAAAAAAAAA==
        </DataArray>
      </Points>
      <Cells>
        <DataArray type="Int64" Name="connectivity" format="binary" RangeMin="0" RangeMax="3">
          IAAAAAAAAAAAAAAAAQAAAAAAAAACAAAAAAAAAAMAAAAAAAAA
        </DataArray>
        <DataArray type="Int64" Name="offsets" format="binary" RangeMin="4" RangeMax="4">
          CAAAAAQAAAAAAAAA
        </DataArray>
        <DataArray type="UInt8" Name="types" format="binary" RangeMin="9" RangeMax="9">
          AQAAAAk=
        </DataArray>
      </Cells>
    </Piece>
  </UnstructuredGrid>
</VTKFile>