Adios VTX reader (VTU) doesn't support CellData
The VTX reader for unstructured grids (VTU) doesn't support cell data. This isn't stated in the limited available docs, but there is a TODO comment in the reader code (https://gitlab.kitware.com/vtk/vtk/-/blob/master/IO/ADIOS2/VTX/schema/vtk/VTXvtkVTU.cxx#L87).
Obviously this means cell data can't be visualised, but it also means the vtkOriginalCellIds
field can't be set.
Edited by Mathieu Westphal (Kitware)