Add support for Polyhedron cells
Elements of type Polyhedron (i.e. N face cells, where each face is a M edge polygon) are in the following format: [nCellFaces, nFace0Pts, id0_0, id0_1, ..., nFace1Pts, id1_0, id1_1, ..., ...]
This has first been proposed in a MR to VTK (vtk/vtk!1255 (closed)), which contains the necessary changes to VTK. The VTK MR also has example/test files attached that demonstrated the functionality.
Ping: @demarle