Read FEniCS/Dolfin Meshes

PyVista leverages meshio to read many mesh formats not natively supported by VTK including the FEniCS/Dolfin XML format.

import pyvista as pv
from pyvista import examples

Let’s download an example FEniCS/Dolfin mesh from our example data repository. This will download an XML Dolfin mesh and save it to PyVista’s data directory.

saved_file = examples.download_file("dolfin_fine.xml")
print(saved_file)

/home/runner/.cache/pyvista_3/dolfin_fine.xml

As shown, we now have an XML Dolfin mesh save locally. This filename can be passed directly to PyVista’s pyvista.read() method to be read into a PyVista mesh.

dolfin = pv.read(saved_file)
dolfin

UnstructuredGrid	Information
N Cells	5400
N Points	2868
X Bounds	0.000e+00, 1.000e+00
Y Bounds	0.000e+00, 1.000e+00
Z Bounds	0.000e+00, 0.000e+00
N Arrays	0

Now we can do stuff with that Dolfin mesh!

qual = dolfin.compute_cell_quality()
qual.plot(show_edges=True, cpos="xy")