[vtkusers] Writing a pvts file properly

[aygo]

Hi all,

I'm trying to understand how to write a .pvts file properly. I have 50x50x50
point data on a cubic, uniform grid. The data is split into four different
processors, each having a slice (in the z direction) of the grid point
positions and point values (pressure, velocity, density). There is no
overlap between the datasets of each processor.

I can write .vts files using the vtk library just fine. Paraview reads each
one of them just fine. The vts file of the first processor "output_0.vts"
looks like this:

<?xml version="1.0"?>
<VTKFile type="StructuredGrid" version="0.1" byte_order="LittleEndian"
compressor="vtkZLibDataCompressor">
   <StructuredGrid WholeExtent="0 49 0 49 0 11">
     <Piece Extent="0 49 0 49 0 11">
       <PointData>
         <DataArray type="Float64" Name="Density" format="appended"
RangeMin="0.001178"             RangeMax="0.001178"                
offset="0"                   />
         <DataArray type="Float64" Name="u" format="appended"
RangeMin="-9960.5735066"        RangeMax="9960.5735066"         o   
ffset="916"                 />
         <DataArray type="Float64" Name="v" format="appended"
RangeMin="-9960.5735066"        RangeMax="9960.5735066"         o   
ffset="113492"              />
         <DataArray type="Float64" Name="w" format="appended" RangeMin="0"                   
RangeMax="0"                    o    ffset="229092"              />
         <DataArray type="Float64" Name="Pressure" format="appended"
RangeMin="955826.16262"         RangeMax="1043825.5135"            
offset="229684"              />
       </PointData>
       <CellData>
       </CellData>
       <Points>
         <DataArray type="Float64" Name="Points" NumberOfComponents="3"
format="appended" RangeMin="0.10882796185"        Range   
Max="8.9148192623"         offset="265460"              />
       </Points>
     </Piece>
   </StructuredGrid>
   <AppendedData encoding="base64">
   </AppendedData>
</VTKFile>

now I'd like to write the corresponding pvts file. What I have so far is the
following:

<?xml version="1.0"?>
<VTKFile type="PStructuredGrid" version="0.1" byte_order="LittleEndian"
compressor="vtkZLibDataCompressor">
  <PStructuredGrid WholeExtent="0 49 0 49 0 49" GhostLevel="1">
    <PPoints>
      <DataArray type="Float64" Name="Points" NumberOfComponents="3"/>
    </PPoints>
    <PPointData>
      <DataArray type="Float64" Name="Density"/>
      <DataArray type="Float64" Name="u"/>
      <DataArray type="Float64" Name="v"/>
      <DataArray type="Float64" Name="w"/>
      <DataArray type="Float64" Name="Pressure"/>
    </PPointData>
    <Piece Extent="0 49 0 49 0 11" Source="output_0.vts"/>
    <Piece Extent="0 49 0 49 12 23" Source="output_1.vts"/>
    <Piece Extent="0 49 0 49 24 35" Source="output_2.vts"/>
    <Piece Extent="0 49 0 49 36 49" Source="output_3.vts"/>
  </PStructuredGrid>
</VTKFile>

When I open this in paraview I get the error message:
"vtkXMLPStructuredGridReader (0x896d9c0): No available piece provides data
for the following extents:
    0 49  0 49  11 12
    0 49  0 49  23 24
    0 49  0 49  35 36
The UpdateExtent cannot be filled."

It's basically complaining that I don't provide data for the extents
separating the pieces... Do I have to or is there some modification to the
file I can make so that it works out? The data from two neighboring
processors do not overlap (is that a crime for paraview/vtk?) but the points
values at the boundary are one Mesh_spacing away from each other. 

Best



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