[Paraview] Multipiece unstructured grid field data (PVTU reader)

[Yves Rogez]

Hello,

I've saved data as multi piece unstructured grid (pvtu) format which is 
composed of a set of vtu files and one pvtu.
When I load the pvtu using a vtkPXMLUnstructuredGridReader, I get the 
compound data of all the vtu files. This is true for point and cell 
data, but field data does not have the same behaviour. Indeed, it seems 
that only the last vtu file field data appears in the final data set.

I see in the vtk sources that the code used for field data is a little 
bit different (as seen in int vtkXMLPDataReader::ReadPieceData()in file 
vtkXMLPDataReader.cxx:380). Field data use a simple copy for each piece, 
and point/cell data use specific methods that offsets the memcpy of 
arrays for each piece in the resulting data set...

Is there a mean to get the compound field data in final data set ? How 
can I retrieve all my pieces field data ?

Thanks in advance for your support,

Yves