Transitioning from mesh.xml to mesh.xdmf, from dolfin-convert to meshio

mesh
3

This can be done using meshio and writing the explicit data to xdmf file.

import meshio
msh = meshio.read("test.msh")

meshio.write("mesh.xdmf", meshio.Mesh(points=msh.points, cells={"tetra": msh.cells["tetra"]}))
meshio.write("mf.xdmf", meshio.Mesh(points=msh.points, cells={"triangle": msh.cells["triangle"]},
                                    cell_data={"triangle": {"name_to_read": msh.cell_data["triangle"]["gmsh:physical"]}}))

from dolfin import * 
mesh = Mesh()
with XDMFFile("mesh.xdmf") as infile:
    infile.read(mesh)
mvc = MeshValueCollection("size_t", mesh, 2) 
with XDMFFile("mf.xdmf") as infile:
    infile.read(mvc, "name_to_read")
mf = cpp.mesh.MeshFunctionSizet(mesh, mvc)
File("dolfinmesh.pvd").write(mesh)
File("dolfincellfunc.pvd").write(mf)
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