The VTU file format expects all pieces to have exactly the same data
arrays. Seems to me what you want is a multiblock dataset, *.vtm,
which can have muliple datasets with different arrays.

On Fri, Feb 3, 2017 at 7:43 AM, Emrah Ersan Erdogan
<emrahersanerdo...@gmail.com> wrote:
> Hi,
>
> I have two small problems and since I am just a newbie I really appreciate 
> any help.
>
> In the first piece I want to create only the geometry and in the second piece 
> some points (these are gauss points actually) and with some data.
>
> First problem is, paraview does not see “strain” when it is defined as given 
> below. However, if I swap the point dataset to the first piece it works: on 
> the wrong points of course.
> Second, it is apparently not possible to show the geometry and point values 
> at the same time. Do you think I need to define two separate files and "light 
> them up" separately on main paraview screen?
>
> Thanks a bunch!
>
> Ersan
>
> <?xml version="1.0"?>
> <VTKFile type="UnstructuredGrid" version="0.1" byte_order="LittleEndian">
>    <UnstructuredGrid>
>       <Piece NumberOfPoints="4" NumberOfCells="1">
>          <Points>
>             <DataArray type="Float64" NumberOfComponents="3" format="ascii">
>                0.00 0.00 0.00 1.00 0.00 0.00 1.00 1.00 0.00 0.00 1.00 0.00
>             </DataArray>
>          </Points>
>          <Cells>
>             <DataArray type="Int64" Name="connectivity" format="ascii">
>                0 1 2 3
>             </DataArray>
>             <DataArray type="Int64" Name="offsets" format="ascii">
>                4
>             </DataArray>
>             <DataArray type="UInt8" Name="types" format="ascii">
>                9
>             </DataArray>
>          </Cells>
>          <PointData Tensors="strain">
>          </PointData>
>          <CellData>
>          </CellData>
>       </Piece>
>       <Piece NumberOfPoints="4" NumberOfCells="0">
>          <Points>
>             <DataArray type="Float64" NumberOfComponents="3" format="ascii">
>                0.25 0.25 0.00 0.75 0.25 0.00 0.75 0.75 0.00 0.25 0.75 0.00
>             </DataArray>
>          </Points>
>          <Cells>
>             <DataArray type="Int64" Name="connectivity" format="ascii">
>             </DataArray>
>             <DataArray type="Int64" Name="offsets" format="ascii">
>            </DataArray>
>             <DataArray type="UInt8" Name="types" format="ascii">
>             </DataArray>
>          </Cells>
>          <PointData Tensors="strain">
>             <DataArray type="Float64" Name="strain" NumberOfComponents="9" 
> format="ascii">
>                2.0 3.0 0.0
>                3.0 2.0 0.0
>                0.0 0.0 0.0
>
>                1.0 2.0 0.0
>                2.0 1.0 0.0
>                0.0 0.0 0.0
>
>                5.0 4.0 0.0
>                4.0 1.0 0.0
>                0.0 0.0 0.0
>
>                3.0 6.0 0.0
>                6.0 7.0 0.0
>                0.0 0.0 0.0
>             </DataArray>
>          </PointData>
>          <CellData>
>          </CellData>
>       </Piece>
>    </UnstructuredGrid>
> </VTKFile>
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