dolfinx::io Namespace Reference

Support for file IO. More...

Namespaces
	cells
	Functions for the re-ordering of input mesh topology to the DOLFINx ordering, and transpose orderings for file output.
	xdmf_function
	Low-level methods for reading/writing XDMF files.
	xdmf_mesh
	Low-level methods for reading XDMF files.
	xdmf_read
	Low-level methods for reading XDMF files.

Classes
class	ADIOS2Writer
	Base class for ADIOS2-based writers. More...
class	FidesWriter
	Output of meshes and functions compatible with the Fides Paraview reader, see https://fides.readthedocs.io/en/latest/paraview/paraview.html. More...
class	VTXWriter
	Writer for meshes and functions using the ADIOS2 VTX format, see https://adios2.readthedocs.io/en/latest/ecosystem/visualization.html#using-vtk-and-paraview. More...
class	HDF5Interface
	This class provides an interface to some HDF5 functionality. More...
class	VTKFile
	Output of meshes and functions in VTK/ParaView format. Isoparametric meshes of arbitrary degree are supported. For finite element functions, cell-based (DG0) and Lagrange (point-based) functions can be saved. For vertex-based functions the output must be isoparametic, i.e. the geometry and the finite element functions must be defined using the same basis. More...
class	XDMFFile
	Read and write mesh::Mesh, fem::Function and other objects in XDMF. More...

Functions
std::tuple< std::vector< double >, std::array< std::size_t, 2 >, std::vector< std::int64_t >, std::vector< std::uint8_t >, std::vector< std::int64_t >, std::array< std::size_t, 2 > >	vtk_mesh_from_space (const fem::FunctionSpace &V)
	Given a FunctionSpace, create a topology and geometry based on the dof coordinates. More...
std::pair< std::vector< std::int64_t >, std::array< std::size_t, 2 > >	extract_vtk_connectivity (const mesh::Mesh &mesh)
	Extract the cell topology (connectivity) in VTK ordering for all cells the mesh. The 'topology' includes higher-order 'nodes'. The index of a 'node' corresponds to the index of DOLFINx geometry 'nodes'. More...

Detailed Description

Support for file IO.

IO to files for checkpointing and visualisation.

Function Documentation

extract_vtk_connectivity()

std::pair< std::vector< std::int64_t >, std::array< std::size_t, 2 > > extract_vtk_connectivity

(

const mesh::Mesh &

mesh

)

Extract the cell topology (connectivity) in VTK ordering for all cells the mesh. The 'topology' includes higher-order 'nodes'. The index of a 'node' corresponds to the index of DOLFINx geometry 'nodes'.

Parameters

[in]

mesh

The mesh

Returns

The cell topology in VTK ordering and in term of the DOLFINx geometry 'nodes'

Note

The indices in the return array correspond to the point indices in the mesh geometry array

Even if the indices are local (int32), both Fides and VTX require int64 as local input

vtk_mesh_from_space()

std::tuple< std::vector< double >, std::array< std::size_t, 2 >, std::vector< std::int64_t >, std::vector< std::uint8_t >, std::vector< std::int64_t >, std::array< std::size_t, 2 > > vtk_mesh_from_space

(

const fem::FunctionSpace &

V

)

Given a FunctionSpace, create a topology and geometry based on the dof coordinates.

Precondition

V must be a (discontinuous) Lagrange space

Parameters

[in]

V

The function space

Returns

Mesh data

1. node coordinates (shape={num_nodes, 3}), row-major storage
2. node coordinates shape
3. unique global ID for each node (a node that appears on more than one rank will have the same global ID)
4. ghost index for each node (0=non-ghost, 1=ghost)
5. cells (shape={num_cells, nodes_per_cell)}), row-major storage
6. cell shape (shape={num_cells, nodes_per_cell)})