Re: [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).

On 08/29/2013 06:01 AM, Matteo Parsani wrote:

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.

Dear ParaView users,




Any idea what's the problem?

Thank you.

Best Regards



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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.

solution_appended.vtu
Description: Binary data

<?xml version="1.0"?>
<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="appended" RangeMin="1.4142135624"         RangeMax="1.4142135624"         offset="0"                   />
      </Points>
      <Cells>
        <DataArray type="Int64" Name="connectivity" format="appended" RangeMin=""                     RangeMax=""                     offset="136"                 />
        <DataArray type="Int64" Name="offsets" format="appended" RangeMin=""                     RangeMax=""                     offset="184"                 />
        <DataArray type="UInt8" Name="types" format="appended" RangeMin=""                     RangeMax=""                     offset="200"                 />
      </Cells>
    </Piece>
  </UnstructuredGrid>
  <AppendedData encoding="base64">
   _YAAAAAAAAAAAAPA/AAAAAAAA8L8AAAAAAAAAAAAAAAAAAPC/AAAAAAAA8L8AAAAAAAAAAAAAAAAAAPC/AAAAAAAA8D8AAAAAAAAAAAAAAAAAAPA/AAAAAAAA8D8AAAAAAAAAAA==IAAAAAAAAAAAAAAAAQAAAAAAAAACAAAAAAAAAAMAAAAAAAAACAAAAAQAAAAAAAAAAQAAAAk=
  </AppendedData>
</VTKFile>

<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>

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