# Parallel Files
# ==============

# The VTK library supports parallel file formats. Reading meshes broken up into
# several files is natively supported by VTK and PyVista.
from pathlib import Path

import pyvista as pv
from pyvista import examples

# Let's go ahead and download the sample dataset containing an
# `pyvista.UnstructuredGrid` broken up into several files.
# Let's inspect where this downloaded our dataset by setting `load=False` and
# looking at the directory containing the file we downloaded.
filename = examples.download_blood_vessels(load=False)
path = Path(filename).parent
list(path.iterdir())

list((path / 'T0000000500').iterdir())

# Note that a `.pvtu` file is available alongside a directory. This
# directory contains all the parallel files or pieces that make the whole mesh.
# We can simply read the `.pvtu` file and VTK will handle putting the mesh
# together. In PyVista, this is accomplished through `pyvista.read()`.
mesh = pv.read(filename)
mesh

# Plot the pieced together mesh
mesh.plot(scalars='node_value', categories=True)

mesh.plot(scalars='density')

# ----------------------------------------------------------------------
# Generated by sphinx-examples-as-code https://github.com/pyvista/sphinx-examples-as-code