[Paraview] XMLUnstructuredGridWriter and VTK_POLYHEDRON elements

[Insley, Joseph A.]

Hi,

I have a serial vtu dataset provided by one of my users.  Their current code can produce this in either ascii or inline binary.  I am currently trying to convert this to appended binary (ultimately to pvtu with appended binary).
I'm having trouble, which I now believe may stem from the data containing VTK_POLYHEDRON.

I have a simple python script that I use with pvbatch to do this conversion, but I see the same results when I load the original data set with ParaView (4.1.0, in client/server mode), and use the Save Data option and save as vtu.
I get the same results for each input format (ascii or inline binary), and output format (ascii, binary, appended).

The first few lines of the original vtu file look like this:

<?xml version="1.0"?>
  <VTKFile type="UnstructuredGrid" version="0.1" byte_order="BigEndian">
  <UnstructuredGrid>
    <Piece NumberOfPoints="1699427" NumberOfCells="384126">

The first few lines of the converted file look like this:

offset="177748206"ructuredGrid" version="0.1" byte_order="LittleEndian">
  <UnstructuredGrid>
    <Piece NumberOfPoints="1699427"              NumberOfCells="384126"              >


Something is clearly getting jumbled at the beginning of the converted file.  If I manually edit the header of the file to read  <VTKFile type="UnstructuredGrid", there are still problems with the file.  In that case the info tab in ParaView reports the correct number of points and cells, but no geometry is drawn.   I have successfully converted other vtu files using this same method.  The primary difference that I've been able to identify is that the files that are not converting happily contain VTK_POLYHEDRON elements.

Has anyone else seen similar behavior?

Thanks,
joe

===================================================
joseph a. insley                                                          insley at anl.gov<mailto:insley at anl.gov>
argonne leadership computing facility                       (630) 252-5649
argonne national laboratory



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