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import pathlib
import numpy as np
import pytest
import meshplex
from .mesh_tri.helpers import assert_mesh_consistency, compute_all_entities
def get_mesh0():
# _____________
# | _/ \_ |
# | _/ \_ |
# |/_________\|
# |\_ _/|
# | \_ _/ |
# |___ \_/____|
#
points = [
[0.0, 0.0],
[1.0, 0.0],
[1.0, 1.0],
[0.0, 1.0],
[0.0, 0.5],
[0.5, 0.0],
[1.0, 0.5],
[0.5, 1.0],
]
cells = [
[0, 5, 4],
[5, 1, 6],
[6, 2, 7],
[7, 3, 4],
[5, 6, 4],
[6, 7, 4],
]
mesh = meshplex.Mesh(points, cells)
mesh.create_facets()
return mesh
def get_mesh1():
# _____________
# |\_ _/|
# | \_ _/ |
# | \_/ |
# | _/ \_ |
# | _/ \_ |
# |/_________\|
#
points = [[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0], [0.5, 0.5]]
cells = [[0, 1, 4], [1, 2, 4], [2, 3, 4], [0, 4, 3]]
return meshplex.Mesh(points, cells)
def get_mesh2():
this_dir = pathlib.Path(__file__).resolve().parent
mesh0 = meshplex.read(this_dir / "meshes" / "pacman.vtu")
return meshplex.Mesh(mesh0.points[:, :2], mesh0.cells("points"))
@pytest.mark.parametrize(
"remove_idx,expected_num_cells,expected_num_edges",
[
# remove corner cell
[[0], 5, 11],
# remove corner cell
[[0, 4], 4, 10],
# remove interior cells
[[4, 5], 4, 12],
# remove no cells at all
[[], 6, 13],
],
)
def test_remove_cells(remove_idx, expected_num_cells, expected_num_edges):
mesh = get_mesh0()
assert len(mesh.cells("points")) == 6
assert len(mesh.edges["points"]) == 13
# remove a corner cell
mesh.remove_cells(remove_idx)
assert len(mesh.cells("points")) == expected_num_cells
assert len(mesh.edges["points"]) == expected_num_edges
assert_mesh_consistency(mesh)
@pytest.mark.skip(reason="result is hardware-dependent")
def test_remove_cells_boundary():
mesh = get_mesh1()
assert np.all(mesh.is_boundary_point == [True, True, True, True, False])
assert np.all(mesh.is_boundary_facet_local[0] == [False, False, False, False])
assert np.all(mesh.is_boundary_facet_local[1] == [False, False, False, True])
assert np.all(mesh.is_boundary_facet_local[2] == [True, True, True, False])
assert np.all(
mesh.is_boundary_facet == [True, True, False, True, False, True, False, False]
)
assert np.all(mesh.is_boundary_cell)
assert np.all(mesh.facets_cells_idx == [0, 1, 0, 2, 1, 3, 2, 3])
# cell id:
assert np.all(mesh.facets_cells["boundary"][1] == [0, 3, 1, 2])
# local edge:
assert np.all(mesh.facets_cells["boundary"][2] == [2, 1, 2, 2])
# cell id:
assert np.all(
mesh.facets_cells["interior"][1:3].T == [[0, 3], [0, 1], [1, 2], [2, 3]]
)
# local edge:
assert np.all(
mesh.facets_cells["interior"][3:5].T == [[1, 2], [0, 1], [0, 1], [0, 0]]
)
# now lets remove some cells
mesh.remove_cells([0])
assert_mesh_consistency(mesh)
assert np.all(mesh.is_boundary_point)
assert np.all(mesh.is_boundary_facet_local[0] == [False, False, False])
assert np.all(mesh.is_boundary_facet_local[1] == [True, False, True])
assert np.all(mesh.is_boundary_facet_local[2] == [True, True, True])
assert np.all(
mesh.is_boundary_facet == [True, True, True, True, True, False, False]
)
assert np.all(mesh.is_boundary_cell)
def test_remove_boundary_cell():
mesh = get_mesh0()
mesh.remove_boundary_cells(
lambda ibc: np.all(mesh.cell_centroids[ibc] > 0.5, axis=1)
)
assert mesh.cells("points").shape[0] == 5
def test_remove_all():
points = [[0.0, 0.0], [1.0, 0.0], [0.0, 1.0]]
cells = [[0, 1, 2]]
mesh = meshplex.Mesh(points, cells)
assert np.all(mesh.is_point_used)
mesh.remove_cells([0])
assert_mesh_consistency(mesh)
assert not np.any(mesh.is_point_used)
@pytest.mark.parametrize(
"mesh0, remove_cells",
[
(get_mesh0(), [0]),
(get_mesh1(), [0, 1]),
(get_mesh2(), [0, 3, 57, 59, 60, 61, 100]),
],
)
def test_reference(mesh0, remove_cells):
# some dummy calls to make sure the respective value are computed before the cell
# removal and then updated
compute_all_entities(mesh0)
# now remove some cells
mesh0.remove_cells(remove_cells)
assert_mesh_consistency(mesh0)
def test_remove_duplicate():
# lines
points = [0.0, 0.1, 0.7, 1.0]
cells = [[0, 1], [1, 2], [2, 1], [0, 1], [3, 2]]
mesh = meshplex.Mesh(points, cells)
n = mesh.remove_duplicate_cells()
assert n == 2
assert np.all(mesh.cells("points") == [[0, 1], [1, 2], [3, 2]])
# triangle
points = [[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0]]
cells = [[0, 2, 3], [0, 1, 2], [0, 2, 1]]
mesh = meshplex.Mesh(points, cells)
n = mesh.remove_duplicate_cells()
assert n == 1
assert np.all(mesh.cells("points") == [[0, 2, 3], [0, 1, 2]])
# tetrahedra
points = [[0.0, 0.0, 0.0], [1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]]
cells = [[0, 1, 2, 3], [3, 1, 2, 0]]
mesh = meshplex.Mesh(points, cells)
n = mesh.remove_duplicate_cells()
assert n == 1
assert np.all(mesh.cells("points") == [[0, 1, 2, 3]])
if __name__ == "__main__":
test_remove_cells_boundary()
|
