# Hide Cells with Ghosting
# ========================

# Specify specific cells to hide when plotting.
# This is a lightweight alternative to thresholding to quickly hide cells in a
# mesh without creating a new mesh.
# Notably, the mesh must be cast to an `pyvista.UnstructuredGrid` type
# for this to work (use the `cast_to_unstructured_grid` filter).
import numpy as np
from pyvista import examples

vol = examples.load_channels()
mesh = vol.cast_to_unstructured_grid()

# Decide which cells are ghosted with a criteria (feel free to adjust this
# or manually create this array to hide specific cells).
ghosts = np.argwhere(mesh['facies'] < 1.0)

# This will act on the mesh inplace to mark those cell indices as ghosts
mesh.remove_cells(ghosts, inplace=True)

# Now we can plot the mesh and those cells will be hidden
mesh.plot(clim=[0, 4])

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