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"""
.. _ghost_cells_example:
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 :class:`pyvista.UnstructuredGrid` type
for this to work (use the ``cast_to_unstructured_grid`` filter).
"""
from __future__ import annotations
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])
# %%
# .. tags:: plot
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