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visualization.py
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visualization.py
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__copyright__ = """
Copyright (C) 2014 Andreas Kloeckner
Copyright (C) 2020 Alexandru Fikl
"""
__license__ = """
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""
import logging
from dataclasses import dataclass
from functools import singledispatch
from typing import Any, Dict, List, Optional, Tuple
import numpy as np
from arraycontext import flatten
from modepy.shapes import Hypercube, Shape, Simplex
from pytools import memoize_method
from pytools.obj_array import make_obj_array
from meshmode.dof_array import DOFArray
from meshmode.transform_metadata import DiscretizationFlattenedDOFAxisTag
logger = logging.getLogger(__name__)
__doc__ = """
.. autofunction:: make_visualizer
.. autoclass:: Visualizer
.. autofunction:: write_nodal_adjacency_vtk_file
"""
# {{{ helpers
def separate_by_real_and_imag(names_and_fields, real_only):
"""
:arg names_and_fields: input data array must be already flattened into a
single :mod:`numpy` array using :func:`_resample_to_numpy`.
"""
for name, field in names_and_fields:
if isinstance(field, np.ndarray) and field.dtype.char == "O":
assert len(field.shape) == 1
from pytools.obj_array import (
obj_array_imag_copy,
obj_array_real_copy,
obj_array_vectorize,
)
if field[0].dtype.kind == "c":
if real_only:
yield (name,
obj_array_vectorize(obj_array_real_copy, field))
else:
yield (f"{name}_r",
obj_array_vectorize(obj_array_real_copy, field))
yield (f"{name}_i",
obj_array_vectorize(obj_array_imag_copy, field))
else:
yield (name, field)
else:
if field.dtype.kind == "c":
if real_only:
yield (name, field.real.copy())
else:
yield (f"{name}_r", field.real.copy())
yield (f"{name}_i", field.imag.copy())
else:
yield (name, field)
def _stack_object_array(vec, *, by_group=False):
if not by_group:
return np.stack(vec)
return make_obj_array([
np.stack([ri[igrp] for ri in vec])
for igrp in range(vec[0].size)
])
def _resample_to_numpy(conn, vis_discr, vec, *, stack=False, by_group=False):
"""
:arg stack: if *True* object arrays are stacked into a single
:class:`~numpy.ndarray`.
:arg by_group: if *True*, the per-group arrays in a :class:`DOFArray`
are flattened separately. This can be used to write each group as a
separate mesh (in supporting formats).
"""
# "stack" exists as mainly as a workaround for Xdmf. See here:
# https://github.com/inducer/pyvisfile/pull/12#discussion_r550959081
# for (minimal) discussion.
if isinstance(vec, np.ndarray) and vec.dtype.char == "O":
from pytools.obj_array import obj_array_vectorize
r = obj_array_vectorize(
lambda x: _resample_to_numpy(conn, vis_discr, x, by_group=by_group),
vec)
return _stack_object_array(r, by_group=by_group) if stack else r
if isinstance(vec, DOFArray):
actx = vec.array_context
vec = conn(vec)
from numbers import Number
if by_group:
if isinstance(vec, Number):
return make_obj_array([
np.full(grp.ndofs, vec) for grp in conn.to_discr.groups
])
elif isinstance(vec, DOFArray):
if __debug__:
from meshmode.dof_array import check_dofarray_against_discr
check_dofarray_against_discr(vis_discr, vec)
return make_obj_array([
actx.to_numpy(ivec).reshape(-1) for ivec in vec
])
else:
raise TypeError(f"unsupported array type: {type(vec).__name__}")
else:
if isinstance(vec, Number):
nnodes = sum(grp.ndofs for grp in conn.to_discr.groups)
return np.full(nnodes, vec)
elif isinstance(vec, DOFArray):
if __debug__:
from meshmode.dof_array import check_dofarray_against_discr
check_dofarray_against_discr(vis_discr, vec)
return actx.to_numpy(actx.tag_axis(0,
DiscretizationFlattenedDOFAxisTag(),
flatten(vec, actx)))
else:
raise TypeError(f"unsupported array type: {type(vec).__name__}")
def preprocess_fields(names_and_fields):
"""Gets arrays out of dataclasses and removes empty arrays."""
from dataclasses import fields, is_dataclass
def is_empty(field):
return field is None or (isinstance(field, np.ndarray)
and field.dtype.char == "O" and len(field) == 0)
result = []
for name, field in names_and_fields:
if is_dataclass(field):
for attr in fields(field):
value = getattr(field, attr.name)
if not is_empty(value):
result.append((f"{name}_{attr.name}", value))
elif not is_empty(field):
result.append((name, field))
return result
@dataclass(frozen=True)
class _VisConnectivityGroup:
"""
.. attribute:: vis_connectivity
An array of shape ``(nelements, nsubelements, primitive_element_size)``.
.. attribute:: vtk_cell_type
.. attribute:: subelement_nr_base
Starting index for subelements in :attr:`vis_connectivity`.
"""
vis_connectivity: np.ndarray
vtk_cell_type: int
subelement_nr_base: int
@property
def nsubelements(self):
return self.nelements * self.nsubelements_per_element
@property
def nelements(self):
return self.vis_connectivity.shape[0]
@property
def nsubelements_per_element(self):
return self.vis_connectivity.shape[1]
@property
def primitive_element_size(self):
return self.vis_connectivity.shape[2]
def _check_discr_same_connectivity(discr, other):
if len(discr.groups) != len(other.groups):
return False
if not all(
sg.discretization_key() == og.discretization_key()
and sg.nelements == og.nelements
for sg, og in zip(discr.groups, other.groups)):
return False
return True
# }}}
# {{{ vtk submeshes
@singledispatch
def vtk_submesh_for_shape(shape: Shape, node_tuples):
raise NotImplementedError(type(shape).__name__)
@vtk_submesh_for_shape.register(Simplex)
def _(shape: Simplex, node_tuples):
import modepy as mp
return mp.submesh_for_shape(shape, node_tuples)
@vtk_submesh_for_shape.register(Hypercube)
def _(shape: Hypercube, node_tuples):
node_tuple_to_index = {nt: i for i, nt in enumerate(node_tuples)}
# NOTE: this can't use mp.submesh_for_shape because VTK vertex order is
# counterclockwise instead of z order
el_offsets = {
1: [(0,), (1,)],
2: [(0, 0), (1, 0), (1, 1), (0, 1)],
3: [
(0, 0, 0),
(1, 0, 0),
(1, 1, 0),
(0, 1, 0),
(0, 0, 1),
(1, 0, 1),
(1, 1, 1),
(0, 1, 1),
]
}[shape.dim]
from pytools import add_tuples
elements = []
for origin in node_tuples:
try:
elements.append(tuple(
node_tuple_to_index[add_tuples(origin, offset)]
for offset in el_offsets
))
except KeyError:
pass
return elements
# }}}
# {{{ vtk connectivity
class VTKConnectivity:
"""Connectivity for standard linear VTK element types.
.. attribute:: version
.. attribute:: cells
.. attribute:: groups
"""
def __init__(self, connection):
self.connection = connection
self.discr = connection.from_discr
self.vis_discr = connection.to_discr
@property
def version(self):
return "0.1"
@property
def simplex_cell_types(self):
import pyvisfile.vtk as vtk
return {
1: vtk.VTK_LINE,
2: vtk.VTK_TRIANGLE,
3: vtk.VTK_TETRA,
}
@property
def tensor_cell_types(self):
import pyvisfile.vtk as vtk
return {
1: vtk.VTK_LINE,
2: vtk.VTK_QUAD,
3: vtk.VTK_HEXAHEDRON,
}
def connectivity_for_element_group(self, grp):
import modepy as mp
from meshmode.mesh import _ModepyElementGroup
if isinstance(grp.mesh_el_group, _ModepyElementGroup):
shape = grp.mesh_el_group._modepy_shape
space = mp.space_for_shape(shape, grp.order)
assert type(space) == type(grp.mesh_el_group._modepy_space) # noqa: E721
node_tuples = mp.node_tuples_for_space(space)
el_connectivity = np.array(
vtk_submesh_for_shape(shape, node_tuples),
dtype=np.intp)
if isinstance(shape, Simplex):
vtk_cell_type = self.simplex_cell_types[shape.dim]
elif isinstance(shape, Hypercube):
vtk_cell_type = self.tensor_cell_types[shape.dim]
else:
raise TypeError(f"unsupported shape: {type(shape)}")
else:
raise NotImplementedError("visualization for element groups "
"of type '%s'" % type(grp.mesh_el_group).__name__)
assert len(node_tuples) == grp.nunit_dofs
return el_connectivity, vtk_cell_type
@property
@memoize_method
def cells(self):
return np.hstack([
vgrp.vis_connectivity.reshape(-1) for vgrp in self.groups
])
@property
@memoize_method
def groups(self):
"""
:return: a list of :class:`_VisConnectivityGroup` instances.
"""
# Assume that we're using modepy's default node ordering.
result = []
subel_nr_base = 0
node_nr_base = 0
for grp in self.vis_discr.groups:
el_connectivity, vtk_cell_type = \
self.connectivity_for_element_group(grp)
offsets = node_nr_base + np.arange(
0,
grp.nelements * grp.nunit_dofs,
grp.nunit_dofs).reshape(-1, 1, 1)
vis_connectivity = (offsets + el_connectivity).astype(np.intp)
vgrp = _VisConnectivityGroup(
vis_connectivity=vis_connectivity,
vtk_cell_type=vtk_cell_type,
subelement_nr_base=subel_nr_base)
result.append(vgrp)
subel_nr_base += vgrp.nsubelements
node_nr_base += grp.ndofs
return result
@property
@memoize_method
def cell_types(self):
nsubelements = sum(vgrp.nsubelements for vgrp in self.groups)
cell_types = np.empty(nsubelements, dtype=np.uint8)
cell_types.fill(255)
for vgrp in self.groups:
isubelements = np.s_[
vgrp.subelement_nr_base:
vgrp.subelement_nr_base + vgrp.nsubelements]
cell_types[isubelements] = vgrp.vtk_cell_type
assert (cell_types < 255).all()
return cell_types
class VTKLagrangeConnectivity(VTKConnectivity):
"""Connectivity for high-order Lagrange elements."""
@property
def version(self):
return "2.0"
@property
def simplex_cell_types(self):
import pyvisfile.vtk as vtk
return {
1: vtk.VTK_LAGRANGE_CURVE,
2: vtk.VTK_LAGRANGE_TRIANGLE,
3: vtk.VTK_LAGRANGE_TETRAHEDRON,
}
@property
def tensor_cell_types(self):
import pyvisfile.vtk as vtk
return {
1: vtk.VTK_LAGRANGE_CURVE,
2: vtk.VTK_LAGRANGE_QUADRILATERAL,
3: vtk.VTK_LAGRANGE_HEXAHEDRON,
}
def connectivity_for_element_group(self, grp):
from meshmode.mesh import SimplexElementGroup, TensorProductElementGroup
vtk_version = tuple(int(v) for v in self.version.split("."))
if isinstance(grp.mesh_el_group, SimplexElementGroup):
from pyvisfile.vtk.vtk_ordering import (
vtk_lagrange_simplex_node_tuples,
vtk_lagrange_simplex_node_tuples_to_permutation,
)
node_tuples = vtk_lagrange_simplex_node_tuples(
grp.dim, grp.order, vtk_version=vtk_version)
el_connectivity = np.array(
vtk_lagrange_simplex_node_tuples_to_permutation(node_tuples),
dtype=np.intp).reshape((1, 1, -1))
vtk_cell_type = self.simplex_cell_types[grp.dim]
elif isinstance(grp.mesh_el_group, TensorProductElementGroup):
from pyvisfile.vtk.vtk_ordering import (
vtk_lagrange_quad_node_tuples,
vtk_lagrange_quad_node_tuples_to_permutation,
)
node_tuples = vtk_lagrange_quad_node_tuples(
grp.dim, grp.order, vtk_version=vtk_version)
el_connectivity = np.array(
vtk_lagrange_quad_node_tuples_to_permutation(node_tuples),
dtype=np.intp).reshape((1, 1, -1))
vtk_cell_type = self.tensor_cell_types[grp.dim]
else:
raise NotImplementedError("visualization for element groups "
"of type '%s'" % type(grp.mesh_el_group).__name__)
assert len(node_tuples) == grp.nunit_dofs
return el_connectivity, vtk_cell_type
@property
@memoize_method
def cells(self):
connectivity = np.hstack([
grp.vis_connectivity.reshape(-1)
for grp in self.groups
])
grp_offsets = np.cumsum([0] + [
grp.ndofs for grp in self.vis_discr.groups
])
offsets = np.hstack([
grp_offset + np.arange(
grp.nunit_dofs,
grp.nelements * grp.nunit_dofs + 1,
grp.nunit_dofs)
for grp_offset, grp in zip(grp_offsets, self.vis_discr.groups)
])
return self.vis_discr.mesh.nelements, connectivity, offsets
# }}}
# {{{ visualizer
class Visualizer:
"""
.. automethod:: show_scalar_in_mayavi
.. automethod:: show_scalar_in_matplotlib_3d
.. automethod:: write_vtk_file
.. automethod:: write_parallel_vtk_file
.. automethod:: write_vtkhdf_file
.. automethod:: write_xdmf_file
.. automethod:: copy_with_same_connectivity
"""
def __init__(self, connection,
element_shrink_factor=None,
is_equidistant=False,
_vtk_linear_connectivity=None,
_vtk_lagrange_connectivity=None):
self.connection = connection
self.discr = connection.from_discr
self.vis_discr = connection.to_discr
if element_shrink_factor is None:
element_shrink_factor = 1.0
self.element_shrink_factor = element_shrink_factor
self.is_equidistant = is_equidistant
self._cached_vtk_linear_connectivity = _vtk_linear_connectivity
self._cached_vtk_lagrange_connectivity = _vtk_lagrange_connectivity
def copy_with_same_connectivity(self, actx, discr, skip_tests=False):
"""Makes a copy of the visualizer for a
:class:`~meshmode.discretization.Discretization` with the same group
structure as the original discretization. This can be useful when the
geometry is mapped (e.g. using :func:`~meshmode.mesh.processing.affine_map`)
and the connectivity can be reused.
The *"same group structure"* here means that the two discretizations
should have the same group types, number of elements, degrees of
freedom, etc.
:arg skip_tests: If *True*, no checks in the group structure of the
discretizations are performed.
"""
if not skip_tests:
if not _check_discr_same_connectivity(discr, self.discr):
raise ValueError("'discr' does not have matching group structures")
vis_discr = self.vis_discr.copy(actx=actx, mesh=discr.mesh)
conn = type(self.connection)(
discr, vis_discr,
groups=self.connection.groups,
is_surjective=self.connection.is_surjective)
return type(self)(
conn,
element_shrink_factor=self.element_shrink_factor,
is_equidistant=self.is_equidistant,
_vtk_linear_connectivity=self._cached_vtk_linear_connectivity,
_vtk_lagrange_connectivity=self._cached_vtk_lagrange_connectivity,
)
@memoize_method
def _vis_nodes_numpy(self):
actx = self.vis_discr._setup_actx
return np.array([
actx.to_numpy(actx.tag_axis(
0,
DiscretizationFlattenedDOFAxisTag(),
flatten(actx.thaw(ary), actx)))
for ary in self.vis_discr.nodes()
])
# {{{ mayavi
def show_scalar_in_mayavi(self, field, **kwargs):
# pylint: disable=import-error
import mayavi.mlab as mlab
do_show = kwargs.pop("do_show", True)
nodes = self._vis_nodes_numpy()
field = _resample_to_numpy(self.connection, self.vis_discr, field)
assert nodes.shape[0] == self.vis_discr.ambient_dim
connectivity = self._vtk_connectivity()
vis_connectivity = connectivity.groups[0].vis_connectivity
if self.vis_discr.dim == 1:
nodes = list(nodes)
# pad to 3D with zeros
while len(nodes) < 3:
nodes.append(0*nodes[0])
assert len(nodes) == 3
args = (*nodes, field)
# https://docs.enthought.com/mayavi/mayavi/auto/example_plotting_many_lines.html # noqa: E501
src = mlab.pipeline.scalar_scatter(*args)
src.mlab_source.dataset.lines = vis_connectivity.reshape(-1, 2)
lines = mlab.pipeline.stripper(src)
mlab.pipeline.surface(lines, **kwargs)
elif self.vis_discr.dim == 2:
nodes = list(nodes)
# pad to 3D with zeros
while len(nodes) < 3:
nodes.append(0*nodes[0])
args = (*nodes, vis_connectivity.reshape(-1, 3))
kwargs["scalars"] = field
mlab.triangular_mesh(*args, **kwargs)
else:
raise RuntimeError("meshes of bulk dimension %d are currently "
"unsupported" % self.vis_discr.dim)
if do_show:
mlab.show()
# }}}
# {{{ vtk
@property
def _vtk_linear_connectivity(self):
if self._cached_vtk_linear_connectivity is None:
self._cached_vtk_linear_connectivity = VTKConnectivity(self.connection)
return self._cached_vtk_linear_connectivity
@property
def _vtk_lagrange_connectivity(self):
assert self.is_equidistant
if self._cached_vtk_lagrange_connectivity is None:
self._cached_vtk_lagrange_connectivity = \
VTKLagrangeConnectivity(self.connection)
return self._cached_vtk_lagrange_connectivity
def _vtk_connectivity(self, use_high_order: bool = False) -> VTKConnectivity:
if use_high_order:
if not self.is_equidistant:
raise RuntimeError("Cannot visualize high-order Lagrange elements "
"using a non-equidistant visualizer. "
"Call 'make_visualizer' with 'force_equidistant=True'.")
return self._vtk_lagrange_connectivity
else:
return self._vtk_linear_connectivity
def write_parallel_vtk_file(self, mpi_comm, file_name_pattern, names_and_fields,
compressor=None, real_only=False,
overwrite=False, use_high_order=None,
par_manifest_filename=None):
r"""A convenience wrapper around :meth:`write_vtk_file` for
distributed-memory visualization.
:arg mpi_comm: An object that supports ``mpi_comm.Get_rank()``
and ``mpi_comm.Get_size()`` method calls, typically (but not
necessarily) an instance of ``mpi4py.Comm``. This is used
to determine the current rank as well as the total number
of files being written.
May also be *None* in which case a unit-size communicator
is assumed.
:arg file_name_pattern: A file name pattern (required to end in ``.vtu``)
that will be used with :meth:`str.format` with an (integer)
argument of ``rank`` to obtain the per-rank file name. Relative
path names are also supported.
:arg par_manifest_filename: as in :meth:`write_vtk_file`.
If not given, *par_manifest_filename* is synthesized by
substituting rank 0 into *file_name_pattern* and replacing the file
extension with ``.pvtu``.
See :meth:`write_vtk_file` for the meaning of the remainder of the
arguments.
.. versionadded:: 2020.2
"""
if mpi_comm is not None:
rank = mpi_comm.Get_rank()
nranks = mpi_comm.Get_size()
else:
rank = 0
nranks = 1
if par_manifest_filename is None:
par_manifest_filename = file_name_pattern.format(rank=0)
if not par_manifest_filename.endswith(".vtu"):
raise ValueError("file_name_pattern must produce file names "
"ending in '.vtu'")
par_manifest_filename = par_manifest_filename[:-4] + ".pvtu"
self.write_vtk_file(
file_name=file_name_pattern.format(rank=rank),
names_and_fields=names_and_fields,
compressor=compressor,
real_only=real_only,
overwrite=overwrite,
use_high_order=use_high_order,
par_manifest_filename=par_manifest_filename,
par_file_names=[
file_name_pattern.format(rank=rank)
for rank in range(nranks)
]
)
def write_vtk_file(self, file_name, names_and_fields,
compressor=None, real_only=False, overwrite=False,
use_high_order=None,
par_manifest_filename=None, par_file_names=None):
"""Write a Vtk XML file (typical extension ``.vtu``) containing
the visualization data in *names_and_fields*. Can optionally also write
manifests for distributed memory simulation (typical extension
``.pvtu``). See also :meth:`write_parallel_vtk_file` for a convenience
wrapper.
:arg names_and_fields: A list of tuples ``(name, value)``, where
*name* is a string and *value* is a
:class:`~meshmode.dof_array.DOFArray` or a constant,
or an object array of those.
*value* may also be a data class (see :mod:`dataclasses`),
whose attributes will be inserted into the visualization
with their names prefixed by *name*.
If *value* is *None*, then there is no data to write and the
corresponding *name* will not appear in the data file.
If *value* is *None*, it should be *None* collectively across all
ranks for parallel writes; otherwise the behavior of this routine
is undefined.
:arg overwrite: If *True*, silently overwrite existing
files.
:arg use_high_order: Writes arbitrary order Lagrange VTK elements.
These elements are described in
`this blog post <https://blog.kitware.com/modeling-arbitrary-order-lagrange-finite-elements-in-the-visualization-toolkit/>`__
and are available in VTK 8.1 and newer.
:arg par_manifest_filename: If not *None* write a distributed-memory
manifest with this file name if *file_name* matches the first entry in
*par_file_names*.
:arg par_file_names: A list of file names of visualization files to
include in the distributed-memory manifest.
.. versionchanged:: 2020.2
- Added *par_manifest_filename* and *par_file_names*.
- Added *use_high_order*.
"""
if use_high_order is None:
use_high_order = False
from pyvisfile.vtk import (
VF_LIST_OF_COMPONENTS,
AppendedDataXMLGenerator,
DataArray,
ParallelXMLGenerator,
UnstructuredGrid,
)
nodes = self._vis_nodes_numpy()
names_and_fields = preprocess_fields(names_and_fields)
names_and_fields = [
(name, _resample_to_numpy(
self.connection, self.vis_discr, fld))
for name, fld in names_and_fields
]
# {{{ shrink elements
if abs(self.element_shrink_factor - 1.0) > 1.0e-14:
node_nr_base = 0
for vgrp in self.vis_discr.groups:
nodes_view = (
nodes[:, node_nr_base:node_nr_base + vgrp.ndofs]
.reshape(nodes.shape[0], vgrp.nelements, vgrp.nunit_dofs))
el_centers = np.mean(nodes_view, axis=-1)
nodes_view[:] = (
(self.element_shrink_factor * nodes_view)
+ (1-self.element_shrink_factor)
* el_centers[:, :, np.newaxis])
node_nr_base += vgrp.ndofs
# }}}
# {{{ create grid
connectivity = self._vtk_connectivity(use_high_order)
cells = connectivity.cells
if isinstance(cells, tuple):
cells = (cells[0],
DataArray("connectivity", cells[1]),
DataArray("offsets", cells[2]))
nodes = nodes.reshape(self.vis_discr.ambient_dim, -1)
points = DataArray("points", nodes, vector_format=VF_LIST_OF_COMPONENTS)
grid = UnstructuredGrid(
(nodes.shape[1], points),
cells=cells,
cell_types=connectivity.cell_types)
for name, field in separate_by_real_and_imag(names_and_fields, real_only):
grid.add_pointdata(
DataArray(name, field, vector_format=VF_LIST_OF_COMPONENTS)
)
# }}}
# {{{ write
# {{{ write either both the vis file and the manifest, or neither
import os
responsible_for_writing_par_manifest = (
par_file_names
and par_file_names[0] == file_name)
if os.path.exists(file_name):
if overwrite:
# we simply overwrite below, no need to remove
pass
else:
raise FileExistsError("output file '%s' already exists"
% file_name)
if (responsible_for_writing_par_manifest
and par_manifest_filename is not None):
if os.path.exists(par_manifest_filename):
if overwrite:
# we simply overwrite below, no need to remove
pass
else:
raise FileExistsError("output file '%s' already exists"
% par_manifest_filename)
else:
pass
# }}}
with open(file_name, "w") as outf:
generator = AppendedDataXMLGenerator(
compressor=compressor,
vtk_file_version=connectivity.version)
generator(grid).write(outf)
if par_file_names is not None:
if par_manifest_filename is None:
raise ValueError("must specify par_manifest_filename if "
"par_file_names are given")
if responsible_for_writing_par_manifest:
parfile_relnames = [
os.path.relpath(pn, start=os.path.dirname(par_manifest_filename))
for pn in par_file_names]
with open(par_manifest_filename, "w") as outf:
generator = ParallelXMLGenerator(parfile_relnames)
generator(grid).write(outf)
# }}}
# }}}
# {{{ vtkhdf
def write_vtkhdf_file(self,
file_name: str, names_and_fields: List[Tuple[str, Any]], *,
comm=None,
use_high_order: bool = False,
real_only: bool = False,
overwrite: bool = False,
h5_file_options: Optional[Dict[str, Any]] = None,
dset_options: Optional[Dict[str, Any]] = None) -> None:
"""Write a VTK HDF5 file (typical extension ``'.hdf'``) containing
the visualization fields in *names_and_fields*.
This function requires ``h5py`` and has support for parallel writes
through ``mpi4py``.
:arg comm: an ``mpi4py.Comm``-like interface that supports
``Get_rank``, ``Get_size``, ``scan`` and ``reduce``. The last two
are required to gather global information about the points and
cells in the discretizations.
:arg h5_file_options: a :class:`dict` passed directly to
:class:`h5py.File` that allows controlling chunking, compatibility, etc.
:arg dataset_options: a :class:`dict` passed directly to
:meth:`h5py.Group.create_dataset`.
"""
# {{{ setup
try:
import h5py
except ImportError as exc:
raise ImportError("'write_vtkhdf_file' requires 'h5py'") from exc
if h5_file_options is None:
h5_file_options = {}
if comm is not None:
h5_file_options["comm"] = comm
if "driver" not in h5_file_options:
h5_file_options["driver"] = "mpio"
else:
if h5_file_options["driver"] != "mpio":
raise ValueError(
"parallel HDF5 requires the 'mpio' driver: "
f"driver is '{h5_file_options['driver']}'")
import os
if os.path.splitext(file_name)[-1] != ".hdf":
raise ValueError(f"'file_name' extension must be '.hdf': {file_name}")
if dset_options is None:
dset_options = {}
names_and_fields = preprocess_fields(names_and_fields)
names_and_fields = [
(name, _resample_to_numpy(
self.connection, self.vis_discr, fld))
for name, fld in names_and_fields
]
if comm is None:
mpisize = 1
mpirank = 0
else:
mpisize = comm.Get_size()
mpirank = comm.Get_rank()
# }}}
# {{{ write
# https://gitlab.kitware.com/vtk/vtk/-/merge_requests/7552/diffs?commit_id=ff63361e1e625bf5f8ff82a4063a9bc5b9f35818#92f6af7573e5302296e4d465fea1d411d4a2611d
# https://docs.vtk.org/en/latest/design_documents/VTKFileFormats.html#vtkhdf-file-format
def create_dataset(grp, name, data, *, shape, offset):
if data.ndim == 2 and data.shape[1] < 3:
# NOTE: Paraview 5.10 (with bundled VTK 9.0.20210922) seems to
# be hardcoded to 3D somewhere for the VTKHDF format, so we
# pad the point arrays as well.
data = np.pad(data, ((0, 0), (0, 3 - shape[1])))
shape = (shape[0], 3)
dset = grp.create_dataset(name, shape, dtype=data.dtype, **dset_options)
dset[offset:offset + data.shape[0]] = data
return dset
with h5py.File(file_name, "w", **h5_file_options) as h5:
root = h5.create_group("VTKHDF")
root.attrs.create("Version", [1, 0])
nodes = np.stack(self._vis_nodes_numpy()).T
# {{{ local connectivity
connectivity = self._vtk_connectivity(use_high_order)
cell_types = connectivity.cell_types
try:
cell_count, cell_connectivity, cell_offsets = connectivity.cells
cell_offsets = np.append([0], cell_offsets)
except ValueError:
from pyvisfile.vtk import CELL_NODE_COUNT
cell_count = cell_types.size
cell_connectivity = connectivity.cells
cell_offsets = np.cumsum(np.append([0],
np.vectorize(CELL_NODE_COUNT.get)(cell_types)),
dtype=cell_connectivity.dtype)
# }}}
# {{{ determine partitions
node_count = nodes.shape[0]
conn_count = cell_connectivity.size
if comm is None:
global_cell_offset = 0
global_node_offset = 0
global_conn_offset = 0
global_cell_count = cell_count
global_node_count = node_count
global_conn_count = conn_count
else:
from mpi4py import MPI
# FIXME: should be able to do all these in one go
global_cell_offset = comm.scan(cell_count) - cell_count
global_node_offset = comm.scan(node_count) - node_count
global_conn_offset = comm.scan(conn_count) - conn_count
global_cell_count = comm.allreduce(cell_count, op=MPI.SUM)
global_node_count = comm.allreduce(node_count, op=MPI.SUM)
global_conn_count = comm.allreduce(conn_count, op=MPI.SUM)
# }}}
# {{{ write mesh