The legacy VTK file reader for unstructured grids had a bug when reading
cells of type voxel. VTK-m does not support the voxel cell type in
unstructured grids (i.e. explicit cell sets), so it has to convert them to
hexahedron cells. A bug in the reader was mangling the cell array index
during this conversion.
Sandia National Laboratories recently changed management from the
Sandia Corporation to the National Technology & Engineering Solutions
of Sandia, LLC (NTESS). The copyright statements need to be updated
accordingly.