[Paraview] XDMF Reader

[David E DeMarle]

Put the co-rect-mesh (image data) inside a grid collection (multiblock).

Paraview's pipeline doesn't deal well with image data that changes
dimensions over time. This is not limited to xdmf. When inside a
multiblock, a different pipeline layer takes over and it works out.

On Sep 6, 2017 5:09 AM, "D Haley" <mycae at gmx.com> wrote:

>
> Dear Paraview List,
>
> I'm trying to read some HDF files, which contain dense voxel data. In my
> calculations, I write out the HDF and wrapper XDMF data to store
> timestep and other metadata.
>
> This all works fine, until I want to have 2 different voxel sizes at 2
> different timesteps (different number of voxels in each dimension).
>
> When loading up the data as a series of time-steps, everything works
> until I reach the first set of data from the new size. When loading the
> data, the values in the voxels seem to become invalid, and the bounding
> box around the data starts moving in the direction of (1,1,1).
>
> I can load each timestep individually correctly, it is just when I try
> to load the entire timeseries that it fails.
>
> Does anyone know a solution for this? I have raw voxel grids in the
> program that generates the data, so I need to wrap them in something to
> provide a timestep. I'd rather avoid having to interface with VTK, as
> the code I am working on does not have a VTK dependency - I'm just
> post-processing with paraview.
>
> I'm opening the series via:
> File->Open, then select the tree item data-..xmdf
>
> each file is written as:
>
> data-1.hdf.xmdf
> data-2.hdf.xmdf
> ....
>
> The XMDF files contain something like this
>
> Before problem timestep:
> ==========
> <?xml version="1.0" ?>
> <!DOCTYPE Xdmf SYSTEM "Xdmf.dtd" []>
> <Xdmf xmlns:xi="http://www.w3.org/2003/XInclude" Version="2.2">
> <Domain>
> <Grid Name="Data" GridType="Uniform">
> <Topology TopologyType="3DCORECTMesh" Dimensions="39 39 39"/>
> <Geometry GeometryType="ORIGIN_DXDYDZ">
> <DataItem Name="Origin" Dimensions="3" NumberType="Float" Precision="4"
> Format="XML">-1.26667 -1.26667 -1.26667</DataItem>
> <DataItem Name="Spacing" Dimensions="3" NumberType="Float" Precision="4"
> Format="XML">0.0666667 0.0666667 0.0666667</DataItem>
> </Geometry>
> <Attribute Name="second 0" AttributeType="Scalar" Center="Node">
> <DataItem Format="HDF" NumberType="Float" Precision="4" Dimensions="39
> 39 39">data-59.hdf:/voxels</DataItem></Attribute>
> </Grid>
> </Domain>
> </Xdmf>
> ==========
>
> After problem timestep:
> ==========
> <?xml version="1.0" ?>
> <!DOCTYPE Xdmf SYSTEM "Xdmf.dtd" []>
> <Xdmf xmlns:xi="http://www.w3.org/2003/XInclude" Version="2.2">
> <Domain>
> <Grid Name="Data" GridType="Uniform">
> <Topology TopologyType="3DCORECTMesh" Dimensions="31 31 31"/>
> <Geometry GeometryType="ORIGIN_DXDYDZ">
> <DataItem Name="Origin" Dimensions="3" NumberType="Float" Precision="4"
> Format="XML">-1 -1 -1</DataItem>
> <DataItem Name="Spacing" Dimensions="3" NumberType="Float" Precision="4"
> Format="XML">0.0666667 0.0666667 0.0666667</DataItem>
> </Geometry>
> <Attribute Name="second 0" AttributeType="Scalar" Center="Node">
> <DataItem Format="HDF" NumberType="Float" Precision="4" Dimensions="31
> 31 31">data-60.hdf:/voxels</DataItem></Attribute>
> </Grid>
> </Domain>
> </Xdmf>
> ==========
>
>
> Thanks!
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