[vtkusers] Example .vti file

[Jack Poulson]

Okay, I have toyed around and gotten the pvti/vti files almost working, but
when I load the pvti file and add a filter (i.e., threshold), then set it to
color based upon my "cell_scalars" data, only one of my four process's data
is displayed. I have been guessing as to what the appropriate WholeExtent
and Extent choices are for each of the four processes. For completeness,
here is a sketch of the parallel file and the four serial files (one for
each quadrant of the square slab). I would greatly appreciate any help.

slab.pvti:
<?xml version="1.0"?>
<VTKFile type="PImageData" version="0.1" byte_order="LittleEndian">
 <PImageData WholeExtent="0 640 0 640 0 1" Origin="0 0 0 " Spacing = "1 1 1"
GhostLevel="0">
  <PCellData Scalars="cell_scalars">
   <PDataArray type="Float64" Name="cell_scalars"/>
  </PCellData>
  <Piece Extent="0 320 0 320 0 1" Source="slab_0.vti"/>
  <Piece Extent="0 320 320 640 0 1" Source="slab_1.vti"/>
  <Piece Extent="320 640 0 320 0 1" Source="slab_2.vti"/>
  <Piece Extent="320 640 320 640 0 1" Source="slab_3.vti"/>
 </PImagData>
</VTKFile>

slab_0.vti:
<?xml_version="1.0"?>
<VTKFile type="ImageData" version="0.1" byte_order="LittleEndian">
 <ImageData WholeExtent="0 640 0 640 0 1" Origin="0 0 0" Spacing="1 1 1">
  <Piece Extent="0 320 0 320 0 1">
   <CellData Scalars="cell_scalars">
    <DataArray type="Float64" Name="cell_scalars" format="ascii">
...data is here...
    </DataArray>
   </CellData>
  </Piece>
 </ImageData>
</VTKFile>

slab_1.vti:
<?xml_version="1.0"?>
<VTKFile type="ImageData" version="0.1" byte_order="LittleEndian">
 <ImageData WholeExtent="0 640 0 640 0 1" Origin="0 0 0" Spacing="1 1 1">
  <Piece Extent="0 320 320 640 0 1">
   <CellData Scalars="cell_scalars">
    <DataArray type="Float64" Name="cell_scalars" format="ascii">
...data is here...
    </DataArray>
   </CellData>
  </Piece>
 </ImageData>
</VTKFile>

slab_2.vti:
<?xml_version="1.0"?>
<VTKFile type="ImageData" version="0.1" byte_order="LittleEndian">
 <ImageData WholeExtent="0 640 0 640 0 1" Origin="0 0 0" Spacing="1 1 1">
  <Piece Extent="320 640 0 320 0 1">
   <CellData Scalars="cell_scalars">
    <DataArray type="Float64" Name="cell_scalars" format="ascii">
...data is here...
    </DataArray>
   </CellData>
  </Piece>
 </ImageData>
</VTKFile>

slab_3.vti:
<?xml_version="1.0"?>
<VTKFile type="ImageData" version="0.1" byte_order="LittleEndian">
 <ImageData WholeExtent="0 640 0 640 0 1" Origin="0 0 0" Spacing="1 1 1">
  <Piece Extent="320 640 320 640 0 1">
   <CellData Scalars="cell_scalars">
    <DataArray type="Float64" Name="cell_scalars" format="ascii">
...data is here...
    </DataArray>
   </CellData>
  </Piece>
 </ImageData>
</VTKFile>

Thanks again,
Jack

On Fri, Feb 11, 2011 at 9:28 AM, Jack Poulson <jack.poulson at gmail.com>wrote:

> I have been scouring the web and the VTK documentation for an example of an
> XML vtkImageData file (and preferably a .pvti/.vti pairing), but I cannot
> seem to find one.
>
> I know that you guys heavily recommend using vtkXMLPImageDataWriter, but I
> have a parallel code that I would like to dump out .pvti and .vti files from
> without requiring the user to link to VTK.
>
> Does anyone know where I can read a precise specification or find an
> example file? Even a trivial ascii/binary/appended data version would
> suffice.
>
> Thank you in advance,
> Jack
>
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