# Examples from pyvista.UnstructuredGrid
# ======================================

import pyvista as pv
from pyvista import examples
import vtk

# Create an empty grid
grid = pv.UnstructuredGrid()

# Copy a vtkUnstructuredGrid
vtkgrid = vtk.vtkUnstructuredGrid()
grid = pv.UnstructuredGrid(vtkgrid)

# From a filename.
grid = pv.UnstructuredGrid(examples.hexbeamfile)
grid.plot(show_edges=True)

# From arrays. Here we create a single tetrahedron.
cells = [4, 0, 1, 2, 3]
celltypes = [pv.CellType.TETRA]
points = [
    [1.0, 1.0, 1.0],
    [1.0, -1.0, -1.0],
    [-1.0, 1.0, -1.0],
    [-1.0, -1.0, 1.0],
]
grid = pv.UnstructuredGrid(cells, celltypes, points)
grid.plot(show_edges=True)

# See the Creating an Unstructured Grid example for more details
# on creating unstructured grids within PyVista.

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