Source code for felupe.mesh._read
# -*- coding: utf-8 -*-
"""
This file is part of FElupe.
FElupe is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
FElupe is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FElupe. If not, see <http://www.gnu.org/licenses/>.
"""
import numpy as np
from ._container import MeshContainer
from ._mesh import Mesh
[docs]
def read(
filename, file_format=None, cellblock=None, dim=None, merge=False, decimals=None
):
"""Read a mesh from a file using :func:`meshio.read` and create a
:class:`~felupe.MeshContainer`.
Parameters
----------
filename : str
The filename of the mesh file.
file_format : str or None, optional
The file format of the mesh file (default is None).
cellblock : list of int or None, optional
Read only a subset of the cellblocks from the mesh file (default is None). If
None, all cell blocks are added to the :class:`~felupe.MeshContainer`.
dim : int or None, optional
If provided, the dimension to trim the points array to (default is None). If
None, the points array is unchanged.
merge : bool, optional
Flag to merge duplicate mesh points. This changes the cells arrays of the
meshes. Default is False.
decimals : float or None, optional
Precision decimals for merging duplicated mesh points. Only relevant if
merge=True. Default is None.
Returns
-------
MeshContainer
A mesh container created with :func:`meshio.read`.
Examples
--------
>>> import felupe as fem
>>>
>>> mesh = fem.Rectangle(n=3)
>>> mesh.write(filename="mesh.xdmf")
>>> container = fem.mesh.read("mesh.xdmf")
>>> container
<felupe mesh container object>
Number of points: 9
Number of cells:
quad: 4
>>> container.meshes[0]
<felupe Mesh object>
Number of points: 9
Number of cells:
quad: 4
See Also
--------
meshio.read : Reads an unstructured mesh with added data.
felupe.Mesh.write : Write the mesh to a file.
"""
from meshio import read as meshio_read
m = meshio_read(filename=filename, file_format=file_format)
if dim is None:
dim = m.points.shape[1]
points = m.points[:, :dim]
if cellblock is None:
cellblock = slice(None)
cells = m.cells[cellblock]
if not isinstance(cells, list):
cells = [cells]
if len(cells) > 0:
meshes = [Mesh(points, c.data, c.type) for c in cells]
else:
meshes = [Mesh(points, np.zeros((0, 0), dtype=int), None)]
return MeshContainer(meshes, merge=merge, decimals=decimals)