Paraview Appended Encoded .vtu file not working

ParaView Support
1

I’m trying to get Paraview to work with with appended encoded vtk files but something is not correct in either the vtk file or paraview’s way of writing it.

Let’s say I have the following .vtu file that I open in Paraview:

<VTKFile type="UnstructuredGrid" version="1.0" byte_order="LittleEndian" header_type="UInt64">
  <UnstructuredGrid>
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Paraview opens and reads the data without any problem. Sometime I wish to share large files and the appended encoded should be a nice way of reducing the size of the file to be share so I try to write the data using Paraview. The paraview options for this are:

image
image575×589 33.2 KB

And this creates a nice and compact .vtu file. However, If i try to open the newly created appended encoded file in paraview, it fails with the following error.

ERROR: In vtkXMLParser.cxx, line 364
vtkXMLDataParser (0x55b165fa5a20): Error parsing XML in stream at line 43, column 21, byte index 2099: not well-formed (invalid token)

ERROR: In vtkXMLReader.cxx, line 576
vtkXMLUnstructuredGridReader (0x55b1645e9220): Error parsing input file.  ReadXMLInformation aborting.

Is this a bug in how the appended .vtu is being created by Paraview or a bug in Paraview related to how it reads appended and encoded data.

I’ve attached the appended encoded file created from paraview based on the ascii xml version above. According to the VTK file format specification, this looks like a valid file but I can’t figure out what is the problem or whether it’s related to Paraview’s reading or writing of the file. I would have expected paraview to be able to load any file it creates.

points_paraview_save_appended_encoded.vtu (14.9 KB)

2

Known issue caused by libexpat when using the ParaView 5.12 (or older) package or compiling yourself again a recent libexpat provided by distribution: vtkXMLDataParser broken by expat (#4) · Issues · Arch Linux / Packaging / Packages / paraview · GitLab

Current possible fix:

3

Thanks @mwestphal. I can confirm that the appended file works in the latest version of Paraview (5.12.1 - windows) but I’ve also been able to confirm that the paravis module of a much older SALOME version can read the .vtu file as well, so seems the writing is correct.