Can PyLith handle a mesh containing more than one element type in version 2.2? For example, can material 1 be composed of tetrahedrals and material 2 be composed of hexahedrals?
Neither PyLith v2 nor PyLith v3 can handle meshes with multiple cell types (tris, quads, hexes, or tets).
PyLith 3 is much closer to this. The infrastructure has the ability to have different cells types for different materials. However, it is not hooked up to the input stage. We can put it down for 3.1 if it is something that you need.