"""
.. _extract_cells_inside_surface_example:

Extract Cells Inside Surface
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Extract the cells inside or outside a closed surface using
:meth:`~pyvista.DataSetFilters.select_interior_points`.

"""

# %%

# sphinx_gallery_thumbnail_number = 2
from __future__ import annotations

import pyvista as pv
from pyvista import examples

mesh = examples.download_cow()

cpos = pv.CameraPosition(
    position=(13.0, 7.6, -13.85),
    focal_point=(0.44, -0.4, -0.37),
    viewup=(-0.28, 0.9, 0.3),
)

dargs = dict(show_edges=True)
# Rotate the mesh to have a second mesh
rot = mesh.rotate_y(90, inplace=False)

pl = pv.Plotter()
pl.add_mesh(mesh, color='Crimson', **dargs)
pl.add_mesh(rot, color='mintcream', opacity=0.35, **dargs)
pl.camera_position = cpos
pl.show()

# %%
# Mark points inside with 1 and outside with a 0
select = mesh.select_interior_points(rot)

select
# %%
# Extract two meshes, one completely inside and one completely outside the
# enclosing surface.

inside = select.threshold(0.5)
outside = select.threshold(0.5, invert=True)

# %%
# display the results

pl = pv.Plotter()
pl.add_mesh(outside, color='Crimson', **dargs)
pl.add_mesh(inside, color='green', **dargs)
pl.add_mesh(rot, color='mintcream', opacity=0.35, **dargs)

pl.camera_position = cpos
pl.show()
# %%
# .. tags:: filter