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from __future__ import annotations
import pathlib
import platform
from requests.exceptions import HTTPError
import meshio
import numpy as np
import pytest
import pyvista as pv
from pyvista import examples
@pytest.fixture
def empty():
return pv.UnstructuredGrid()
@pytest.fixture
def cow_ugrid():
return examples.download_cow().cast_to_unstructured_grid()
@pytest.fixture
def points_only(cow_ugrid):
cow_ugrid.cells = np.array((), dtype=int)
assert cow_ugrid.n_cells == 0
return cow_ugrid
@pytest.fixture
def airplane_ugrid(airplane):
return airplane.cast_to_unstructured_grid()
@pytest.fixture
def uniform_ugrid(uniform):
return uniform.cast_to_unstructured_grid()
@pytest.fixture
def uniform2d():
return pv.ImageData(dimensions=(10, 10, 1)).cast_to_unstructured_grid()
@pytest.fixture
def hybrid():
cells = [
8, 0, 1, 2, 3, 4, 5, 6, 7,
5, 4, 5, 6, 7, 8,
4, 4, 8, 7, 9,
4, 5, 6, 8, 10,
6, 1, 11, 5, 2, 12, 6,
6, 13, 0, 4, 14, 3, 7,
30, 7,
3, 5, 6, 10,
3, 11, 12, 15,
3, 5, 11, 15,
3, 5, 15, 10,
3, 6, 10, 15,
3, 6, 15, 12,
4, 11, 12, 6, 5,
30, 7,
3, 4, 7, 9,
3, 13, 14, 16,
3, 4, 16, 13,
3, 4, 9, 16,
3, 7, 9, 16,
3, 7, 16, 14,
4, 13, 14, 7, 4,
] # fmt: skip
return pv.UnstructuredGrid(
cells,
[
pv.CellType.HEXAHEDRON,
pv.CellType.PYRAMID,
pv.CellType.TETRA,
pv.CellType.TETRA,
pv.CellType.WEDGE,
pv.CellType.WEDGE,
pv.CellType.POLYHEDRON,
pv.CellType.POLYHEDRON,
],
[
[0.0, 0.0, 0.0],
[1.0, 0.0, 0.0],
[1.0, 1.0, 0.0],
[0.0, 1.0, 0.0],
[0.0, 0.0, 1.0],
[1.0, 0.0, 1.0],
[1.0, 1.0, 1.0],
[0.0, 1.0, 1.0],
[0.5, 0.5, 1.5],
[0.0, 0.5, 1.5],
[1.0, 0.5, 1.5],
[2.0, 0.0, 0.0],
[2.0, 1.0, 0.0],
[-1.0, 0.0, 0.0],
[-1.0, 1.0, 0.0],
[2.0, 0.5, 1.0],
[-1.0, 0.5, 1.0],
],
)
@pytest.fixture
def quad_pixel_hex_voxel():
return (
examples.cells.Quadrilateral()
+ examples.cells.Pixel()
+ examples.cells.Hexahedron()
+ examples.cells.Voxel()
)
@pytest.fixture
def mesh2d():
return meshio.Mesh(
points=[[0.0, 0.0], [1.0, 0.0], [0.0, 1.0], [1.0, 1.0]],
cells=[('triangle', [[0, 1, 2], [1, 3, 2]])],
cell_sets={'tri1': [[0]], 'tri2': [[1]]},
)
@pytest.fixture
def polyhedron():
return meshio.Mesh(
points=[
[0.3568221, -0.49112344, 0.79465446],
[-0.3568221, -0.49112344, 0.79465446],
[0.3568221, 0.49112344, -0.79465446],
[-0.3568221, 0.49112344, -0.79465446],
[0.0, 0.98224693, 0.18759243],
[0.0, 0.60706198, 0.79465446],
[0.0, -0.60706198, -0.79465446],
[0.0, -0.98224693, -0.18759243],
[0.93417233, 0.30353101, 0.18759247],
[0.93417233, -0.30353101, -0.18759247],
[-0.93417233, 0.30353101, 0.18759247],
[-0.93417233, -0.30353101, -0.18759247],
[-0.57735026, 0.18759249, 0.79465446],
[0.57735026, -0.79465446, 0.18759249],
[-0.57735026, -0.18759249, -0.79465446],
[0.57735026, 0.79465446, -0.18759249],
[0.57735026, 0.18759249, 0.79465446],
[-0.57735026, 0.79465446, -0.18759249],
[-0.57735026, -0.79465446, 0.18759249],
[0.57735026, -0.18759249, -0.79465446],
[0.3568221, 0.49112344, -1.0],
[0.57735026, -0.18759249, -1.0],
[0.0, -0.60706198, -1.0],
[-0.57735026, -0.18759249, -1.0],
[-0.3568221, 0.49112344, -1.0],
[0.3568221, -0.49112344, 1.0],
[0.57735026, 0.18759249, 1.0],
[0.0, 0.60706198, 1.0],
[-0.57735026, 0.18759249, 1.0],
[-0.3568221, -0.49112344, 1.0],
],
cells=[
(
'polyhedron20',
[
[
[0, 16, 5, 12, 1],
[1, 18, 7, 13, 0],
[2, 19, 6, 14, 3],
[3, 17, 4, 15, 2],
[4, 5, 16, 8, 15],
[5, 4, 17, 10, 12],
[6, 7, 18, 11, 14],
[7, 6, 19, 9, 13],
[8, 16, 0, 13, 9],
[9, 19, 2, 15, 8],
[10, 17, 3, 14, 11],
[11, 18, 1, 12, 10],
],
],
),
(
'polyhedron10',
[
[
[2, 19, 6, 14, 3],
[20, 21, 19, 2],
[21, 22, 6, 19],
[22, 23, 14, 6],
[23, 24, 3, 14],
[24, 20, 2, 3],
[20, 21, 22, 23, 24],
],
[
[0, 16, 5, 12, 1],
[0, 16, 26, 25],
[16, 5, 27, 26],
[5, 12, 28, 27],
[12, 1, 29, 28],
[1, 0, 25, 29],
[25, 26, 27, 28, 29],
],
],
),
],
)
fixture_names = [
'hexbeam',
'airplane_ugrid',
'uniform_ugrid',
'uniform2d',
'hybrid',
'mesh2d',
'polyhedron',
'cow_ugrid',
'empty',
'points_only',
'quad_pixel_hex_voxel',
]
@pytest.mark.parametrize('mesh_in_name', fixture_names)
def test_meshio(request, mesh_in_name):
mesh_in = request.getfixturevalue(mesh_in_name)
if isinstance(mesh_in, meshio.Mesh):
mesh_in = pv.from_meshio(mesh_in)
mesh = pv.from_meshio(pv.to_meshio(mesh_in))
# Assert mesh is still the same
assert np.allclose(mesh_in.points, mesh.points)
if (mesh_in.celltypes == pv.CellType.PIXEL).all():
cells = mesh_in.cells.reshape((mesh_in.n_cells, 5))[:, [0, 1, 2, 4, 3]].ravel()
assert np.allclose(cells, mesh.cells)
elif (mesh_in.celltypes == pv.CellType.VOXEL).all():
cells = mesh_in.cells.reshape((mesh_in.n_cells, 9))[:, [0, 1, 2, 4, 3, 5, 6, 8, 7]].ravel()
assert np.allclose(cells, mesh.cells)
# Mixed cell types with voxels or pixels
elif np.isin(mesh_in.celltypes, [pv.CellType.PIXEL, pv.CellType.VOXEL]).any():
cells_in = []
for cell_type, cell in mesh_in.cells_dict.items():
for indices in cell:
# Pixel
if cell_type == pv.CellType.PIXEL:
cells_in.extend([len(indices), *indices[[0, 1, 3, 2]].tolist()])
# Voxel
elif cell_type == pv.CellType.VOXEL:
cells_in.extend([len(indices), *indices[[0, 1, 3, 2, 4, 5, 7, 6]].tolist()])
else:
cells_in.extend([len(indices), *indices.tolist()])
cells_out = [
i
for cell in mesh.cells_dict.values()
for indices in cell
for i in [len(indices), *indices.tolist()]
]
assert cells_in == cells_out
else:
assert np.allclose(mesh_in.cells, mesh.cells)
for k, v in mesh_in.point_data.items():
assert np.allclose(v, mesh.point_data[k.replace(' ', '_')])
for k, v in mesh_in.cell_data.items():
assert np.allclose(v, mesh.cell_data[k.replace(' ', '_')])
def test_pathlib_read_write(tmpdir, sphere):
path = pathlib.Path(str(tmpdir.mkdir('tmpdir').join('tmp.vtk')))
pv.save_meshio(path, sphere)
assert path.is_file()
mesh = pv.read_meshio(path)
assert isinstance(mesh, pv.UnstructuredGrid)
assert mesh.points.shape == sphere.points.shape
def test_file_format(hexbeam):
from meshio._exceptions import ReadError
from meshio._exceptions import WriteError
with pytest.raises(ReadError):
_ = pv.read_meshio(examples.hexbeamfile, file_format='bar')
with pytest.raises((KeyError, WriteError)):
pv.save_meshio('foo.bar', hexbeam, file_format='bar')
with pytest.raises((KeyError, WriteError)):
pv.save_meshio('foo.npy', hexbeam, file_format='npy')
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