meshio++

I/O for mesh files.

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There are various mesh formats available for representing unstructured meshes. meshio++ can read and write all of the following and smoothly converts between them:

Abaqus (.inp), ANSYS msh (.msh), Ansys/APDL coded database (.cdb, .inp), AVS-UCD (.avs), CGNS (.cgns), DOLFIN XML (.xml), COMSOL (.mphtxt), Exodus (.e, .exo), EnSight Gold (geometry, .case/.geo), FLAC3D (.f3grid), FLUX (mesh .pf3, field .dex), FreeFem++ (.msh), H5M (.h5m), HMF (.hmf, experimental, meshio++-specific), I-deas Universal / UNV (.unv), ANSYS Fluent interpolation (.ip), Kratos/MDPA (.mdpa), Medit (.mesh, .meshb), MED/Salome (.med), Modulef (mesh .mfm, field .mff), Nastran (bulk data, .bdf, .fem, .nas), Netgen (.vol, .vol.gz), Neuroglancer precomputed format, Gmsh (format versions 2.2, 4.0, and 4.1, .msh), OBJ (.obj), OFF (.off), OpenFOAM polyMesh (.foam, read-only), PERMAS (.post, .post.gz, .dato, .dato.gz), PLY (.ply), STL (.stl), Tecplot .dat, TetGen .node/.ele, Triangle .node/.ele/.poly, SVG (output only; 2D direct, 3D via skin projection) (.svg), TikZ (LaTeX output only; 2D direct, 3D via skin projection) (.tikz), SU2 (.su2), UGRID (.ugrid), VTK (.vtk), VTP (.vtp), VTU (.vtu), WKT (TIN) (.wkt), XDMF (.xdmf, .xmf).

meshio++ ships a C++20 core (built with pybind11 + scikit-build-core) that reads and writes most formats with zero-copy numpy at the I/O boundary, plus optional HDF5/netCDF acceleration and a selectable parallel backend (AUTO by default — prefers OpenMP, then STL+TBB, then sequential; override with -DMESHIOPLUSPLUS_PARALLEL_BACKEND=...). Every format has a pure-Python fallback, so behaviour and file compatibility are identical whether or not the native libraries are present. For a standalone C++ build use build/configure.sh (Linux/macOS) or build/configure.bat (Windows). Full docs (install, data model, per-format options, CLI) live at the documentation site (sources under doc/).

Install with

pip install meshioplusplus[all]

([all] pulls in all optional dependencies. By default, meshio++ only uses numpy.) You can then use the command-line tool

meshioplusplus convert    input.msh output.vtk   # convert between two formats

meshioplusplus info       input.xdmf             # show some info about the mesh

meshioplusplus compress   input.vtu              # compress the mesh file
meshioplusplus decompress input.vtu              # decompress the mesh file

meshioplusplus binary     input.msh              # convert to binary format
meshioplusplus ascii      input.msh              # convert to ASCII format

meshioplusplus merge      a.vtu b.vtu out.vtu    # merge meshes (optional --weld)

meshioplusplus transform  in.vtu out.vtu --translate 1,2,3   # affine transform
meshioplusplus clean      in.vtu out.vtu --weld              # weld / prune / de-dup
meshioplusplus crop       in.vtu out.vtu --bbox 0,0,0,1,1,1  # subset by region
meshioplusplus split      in.vtu 'out_{key}.vtu' --by type   # split by criterion
meshioplusplus stats      mesh.vtu                           # geometric statistics
meshioplusplus convert-cells in.msh out.vtu --mode simplexify  # hexes -> tetra
meshioplusplus refine     in.vtu out.vtu --levels 2          # uniform subdivision
meshioplusplus partition  in.vtu 'out_{part}.vtu' --nparts 4 # N balanced parts
meshioplusplus smooth     in.vtu out.vtu --iterations 20     # relax node positions

meshioplusplus data info  mesh.vtu                           # summarize data arrays
meshioplusplus data calc  in.vtu out.vtu --point "s = norm(v)"   # derive a field
meshioplusplus data to-cell  in.vtu out.vtu --keys T         # point -> cell average
meshioplusplus data normalize in.vtu out.vtu --cell damage --to 0,1

with any of the supported formats.

The same verbs are available as a standalone C++ binary that needs no Python: grab a ready-to-run, statically-linked build for Linux/macOS/Windows from the GitHub Releases page, or build it yourself with build/configure.sh --cli --build (or -DMESHIOPLUSPLUS_BUILD_CLI=ON). It links only the C++ core, so point/cell sets (and convert -s/-d) — which live only in the Python Mesh — are unavailable there; use the Python CLI for those.

In Python, simply do

import meshioplusplus

mesh = meshioplusplus.read(
    filename,  # string, os.PathLike, or a buffer/open file
    # file_format="stl",  # optional if filename is a path; inferred from extension
    # see meshioplusplus convert --help for all possible formats
)
# mesh.points, mesh.cells, mesh.cells_dict, ...

# mesh.vtk.read() is also possible

to read a mesh. To write, do

import meshioplusplus

# two triangles and one quad
points = [
    [0.0, 0.0],
    [1.0, 0.0],
    [0.0, 1.0],
    [1.0, 1.0],
    [2.0, 0.0],
    [2.0, 1.0],
]
cells = [
    ("triangle", [[0, 1, 2], [1, 3, 2]]),
    ("quad", [[1, 4, 5, 3]]),
]

mesh = meshioplusplus.Mesh(
    points,
    cells,
    # Optionally provide extra data on points, cells, etc.
    point_data={"T": [0.3, -1.2, 0.5, 0.7, 0.0, -3.0]},
    # Each item in cell data must match the cells array
    cell_data={"a": [[0.1, 0.2], [0.4]]},
)
mesh.write(
    "foo.vtk",  # str, os.PathLike, or buffer/open file
    # file_format="vtk",  # optional if first argument is a path; inferred from extension
)

# Alternative with the same options
meshioplusplus.write_points_cells("foo.vtk", points, cells)

For both input and output, you can optionally specify the exact file_format (in case you would like to enforce ASCII over binary VTK, for example).

Skin extraction

meshioplusplus.extract_skin derives the boundary surface of a 3D volume mesh (the Kratos SkinDetectionProcess face-hashing algorithm — faces occurring exactly once are boundary; points are compacted, point_data follows):

vol = meshioplusplus.read("part.msh")     # tetra/hexa/wedge/pyramid mesh
skin = meshioplusplus.extract_skin(vol)   # triangle/quad/... surface mesh

The STL and PLY writers do this automatically for volume meshes (pass skin=False for the legacy drop-volume-cells behavior), and the SVG/TikZ writers render 3D meshes by projecting the skin through an orthographic camera (azimuth/elevation/roll in degrees, default the classic CAD isometric view) with painter's-algorithm depth ordering — that is exactly how the Stanford-bunny logo above is drawn.

Surface extraction

meshioplusplus.extract_surface is the general form of skin extraction: it picks the dimension automatically (a volume mesh → boundary faces, a 2D surface mesh → boundary edges) and can record each facet's parent cell id (record_parent_ids=True). See the surface extraction docs (doc/extract_surface.md).

surf = meshioplusplus.extract_surface(vol)                  # faces (or edges for a 2D mesh)
edges = meshioplusplus.extract_surface(sheet, record_parent_ids=True)

Mesh quality

meshioplusplus.compute_quality scores every cell on a set of geometric quality metrics (area/volume, scaled Jacobian, aspect ratio, skewness, interior/dihedral angles, warpage) and flags inverted/degenerate cells; attach_quality writes them back as cell_data. See doc/mesh_quality.md.

report = meshioplusplus.compute_quality(mesh)
print(report["num_inverted"], "inverted cells")
annotated = meshioplusplus.attach_quality(mesh)   # metrics as cell_data

Reordering / renumbering

meshioplusplus.reorder renumbers nodes and elements to reduce sparse-matrix bandwidth (Reverse Cuthill–McKee) or improve cache locality (Morton / Hilbert space-filling curves). It is a pure permutation — geometry and all data preserved — and returns the applied node/cell permutations so external arrays can be remapped. compute_bandwidth measures the before/after connectivity bandwidth. See doc/reorder.md.

out = meshioplusplus.reorder(mesh, method="rcm")            # "morton" / "hilbert" too
out, node_perm, cell_perms = meshioplusplus.reorder(mesh, return_permutation=True)
print(meshioplusplus.compute_bandwidth(mesh), "->", meshioplusplus.compute_bandwidth(out))

Comparison (diff)

meshioplusplus.diff compares two meshes and reports whether they are equivalent within a tolerance (abs_err <= atol + rtol*|expected|), with a structured breakdown (points, cells, data, named sets) and an overall verdict (identical / equal within tolerance / different); meshes_equal is the boolean wrapper for test suites. An optional unordered=True mode matches nodes by spatial proximity, so a shuffled node order still compares equal. See doc/diff.md.

assert meshioplusplus.meshes_equal(a, b, atol=1e-8)         # ideal in a regression test
report = meshioplusplus.diff(a, b, unordered=True)          # tolerant to shuffled node order
print(report["verdict"])

The meshioplusplus diff a.vtu b.vtu CLI verb sets a nonzero exit code when meshes differ, for direct use in CI / Makefiles.

Merge / combine

meshioplusplus.merge combines two or more meshes into one: it concatenates points (offsetting connectivity so indices stay valid), merges cell blocks by type, concatenates data (per a configurable data_policy), and tags each cell's origin. With weld=True it fuses coincident nodes across inputs within atol using a spatial hash (never O(N²)) — the standard way to stitch adjacent blocks into a watertight mesh. Overlapping set / field-data names are namespaced by source id. See doc/merge.md.

combined = meshioplusplus.merge([a, b, c])                 # concatenate
welded = meshioplusplus.merge([left, right], weld=True, atol=1e-8)  # fuse the shared interface

Editing (transform / clean / crop / split) and statistics

A bundle of dependency-free mesh-editing utilities:

  • meshioplusplus.transform — apply an affine transform (translate / scale / rotate / 4×4 matrix / unit-scale) to the points; connectivity and data are carried through. See doc/transform.md.
  • meshioplusplus.clean — weld coincident points (spatial hash), drop degenerate and duplicate cells, and remove orphaned points, in one toggleable pass. See doc/clean.md.
  • meshioplusplus.crop — extract the part of a mesh inside a bounding box or half-space, pruning unused points (mode="all"/"any"). See doc/crop.md.
  • meshioplusplus.split — partition a mesh into several by cell type, connected component (flood-fill), or region (cell_sets / integer tag). See doc/split.md.
  • meshioplusplus.compute_stats — geometric statistics (bounding box, centroid, per-type counts, area, signed/unsigned volume, inverted cells) — the geometric complement to info. See doc/stats.md.
out = meshioplusplus.transform(mesh, rotate=("z", 90))
out = meshioplusplus.clean(mesh, weld=True, atol=1e-8)
sub = meshioplusplus.crop(mesh, bbox=[0, 0, 0, 1, 1, 1])
pieces = meshioplusplus.split(mesh, by="type")             # {"triangle": ..., ...}
s = meshioplusplus.compute_stats(mesh)                     # dict of measures

Cell conversion (linearize / simplexify / elevate)

meshioplusplus.convert_cells converts a mesh's element representation — which cell types it is built from — while leaving the object it describes intact. See doc/convert_cells.md.

  • mode="linearize" — every higher-order cell becomes its linear base (tetra10 → tetra, hexahedron27 → hexahedron), keeping the corner connectivity verbatim and pruning the nodes that become unreferenced.
  • mode="simplexify" — every cell is decomposed into simplices of the same topological dimension (quad → 2 triangle, hexahedron → 6 tetra, wedge → 3, pyramid → 2, an n-gon into an (n−2)-triangle fan). No points are added, each parent's cell_data is replicated to its children, and every emitted simplex is positively oriented with volume conserved.
  • mode="elevate" — every linear cell is promoted to its serendipity quadratic counterpart (triangle → triangle6, hexahedron → hexahedron20), adding one node per unique edge at the edge midpoint with point_data set to the endpoint mean.
linear = meshioplusplus.convert_cells(mesh, mode="linearize")
tets = meshioplusplus.convert_cells(mesh, mode="simplexify")   # hexes -> tetra
quadratic = meshioplusplus.convert_cells(mesh, mode="elevate")

Each mode is idempotent on cells it does not apply to, so it is safe on a mixed-order mesh, and output is byte-identical across mesh backends and thread counts.

Refinement

meshioplusplus.refine subdivides every cell into congruent children of the same cell type, increasing a mesh's resolution: line → 2, triangle → 4, quad → 4, tetra → 8, wedge → 8, hexahedron → 8, with levels=n applying the templates n times. See doc/refine.md.

New nodes sit at the midpoints of the parent's edges, quad faces and (hexahedron only) body, and carry the mean of that entity's corner values for every point_data array — so a linear field is interpolated exactly. Mid-edge and quad-face-centre nodes are shared between every cell touching the entity, so the refined mesh has no hanging nodes; each parent's cell_data row is replicated to its children.

fine = meshioplusplus.refine(mesh)                      # one level
finer = meshioplusplus.refine(mesh, levels=2)           # 64x the cells in 3D
tagged = meshioplusplus.refine(mesh, record_parent_ids=True)

Children inherit the parent's orientation (zero newly-inverted cells for a well-oriented input), and volume is conserved — exactly for tetra always, and for wedge/hexahedron when the parent is affine. Higher-order cells, pyramid, and ragged blocks have no same-type subdivision and raise by name.

Partitioning

meshioplusplus.partition decomposes a mesh into exactly N balanced pieces for domain decomposition — the count-driven complement to the criterion-driven split. See doc/partition.md.

  • SFC (the default fallback, always available, dependency-free): cells are cut into contiguous ranges along a Hilbert space-filling curve of their centroids — equal-weight part sizes differ by at most one cell, weights=<cell_data> balances a per-cell cost instead, and the assignment is deterministic and byte-identical across mesh backends and thread counts.
  • KaHIP (the optional quality path): the shared-face dual graph goes through KaHIP's serial kaffpa(), which actively minimizes the edge cut. Configure imbalance (default 3%), mode (fast/eco/strong, default eco — eco/strong carry the quality) and seed. KaHIP is MIT-licensed like meshio++ itself, so enabling it changes nothing about licensing; it is bring-your-own (-DMESHIOPLUSPLUS_WITH_KAHIP=ON + KAHIP_ROOT, Conan with_kahip, vcpkg feature kahip — next to the HDF5/zstd-style optional deps), links only the serial interface (no MPI), and pip install meshioplusplus[kahip] gives pure-Python installs the same quality path via the MIT kahip wheel. Requesting it where absent fails by name — never a silent downgrade.
pieces = meshioplusplus.partition(mesh, 4)                    # list of 4 meshes
labels = meshioplusplus.partition_labels(mesh, 4)             # per-block Int64 part ids
quality = meshioplusplus.partition(mesh, 16, method="kahip", mode="strong")

Pieces keep the input's block structure 1:1, so they recombine into the input: every cell lands in exactly one piece (ghost_layers is reserved for halo growth and raises for now).

Smoothing

meshioplusplus.smooth relaxes point coordinates toward their edge-neighbour centroids to improve element shape, leaving topology and every data value alone: only the points move. See doc/smooth.md.

Both operators are driven by the same centroid displacement. Laplacian (x <- x + lambda*L(x)) smooths strongly per pass but shrinks — over 40 iterations on a jittered 8×8 quad grid it contracts the bounding box by 57%. Taubin (the default) follows each +lambda pass with a larger-magnitude -mu pass that deliberately un-shrinks, leaving the same grid 3.6% smaller. Neighbours are the nodes joined by an actual cell edge, not the element clique, so a structured hex block is a fixed point rather than being bevelled toward a sphere. Boundary nodes, feature nodes (incident boundary facet normals differing by more than feature_angle), an optional frozen mask, and the nodes of blocks whose edge topology is unknown are all pinned by default, and the inversion guard rejects any move that would turn a valid cell inverted.

relaxed = meshioplusplus.smooth(mesh)                          # 10 Taubin iterations
harder = meshioplusplus.smooth(mesh, iterations=40)            # shrink-free even so
lap = meshioplusplus.smooth(mesh, method="laplacian", lambda_=0.4)  # note the underscore
out, report = meshioplusplus.smooth(mesh, return_report=True)  # nodes moved, max displacement

lambda_ carries a trailing underscore because lambda is a Python keyword, and a negative value means "this method's own default" (0.5 Laplacian, 0.33 Taubin). Point and cell counts, connectivity, cell_data, field_data, point_data values and the points array's dtype all come through unchanged, and output is byte-identical across mesh backends and thread counts.

These operations are exposed across every binding surface (Python, C API, Fortran, WASM) and as the CLI verbs meshioplusplus quality, meshioplusplus extract-surface, meshioplusplus reorder, meshioplusplus diff, meshioplusplus merge, meshioplusplus transform, meshioplusplus clean, meshioplusplus crop, meshioplusplus split, meshioplusplus stats, meshioplusplus convert-cells, meshioplusplus refine, meshioplusplus partition, and meshioplusplus smooth.

Data operations (rename / average / calc / condition / summarize)

A second bundle operates on the data arrays a mesh carries (point_data / cell_data / field_data) rather than on its geometry, which none of them ever modifies:

  • meshioplusplus.data_rename / data_drop / data_keep — rewrite which arrays a mesh carries and under what names; values, dtypes and shapes are copied verbatim. See doc/data_manage.md.
  • meshioplusplus.point_data_to_cell_data / cell_data_to_point_data — move data between locations by averaging, optionally weighted by cell area/volume. See doc/data_average.md.
  • meshioplusplus.data_calc — derive a new array from an elementwise expression (+ - * /, parentheses, abs/sqrt/min/max/norm) evaluated by a hand-written parser — no external parser library, no arbitrary-code path. See doc/data_calc.md.
  • meshioplusplus.data_condition — clamp, normalize to a target range, or standardize to zero mean / unit standard deviation, per component or by row magnitude. See doc/data_condition.md.
  • meshioplusplus.data_info — a read-only per-array summary (dtype, shape, components, min/max/mean, NaN/inf counts) — the data-side complement to info and compute_stats. See doc/data_info.md.
out = meshioplusplus.data_calc(mesh, "norm(velocity)", location="point", output="speed")
out = meshioplusplus.point_data_to_cell_data(out, keys=["speed"], suffix="_c")
out = meshioplusplus.data_condition(out, "cell", ["speed_c"], mode="normalize")
out = meshioplusplus.data_rename(out, "point", "T", "temperature")
arrays = meshioplusplus.data_info(out)                     # list of per-array dicts

These are likewise exposed across every binding surface, and as the nine CLI verbs under the meshioplusplus data group (info, rename, drop, keep, to-cell, to-point, calc, clamp, normalize). See doc/data_operations.md.

Time series

The XDMF format supports time series with a shared mesh. You can write times series data using meshio++ with

with meshioplusplus.xdmf.TimeSeriesWriter(filename) as writer:
    writer.write_points_cells(points, cells)
    for t in [0.0, 0.1, 0.21]:
        writer.write_data(t, point_data={"phi": data})

and read it with

with meshioplusplus.xdmf.TimeSeriesReader(filename) as reader:
    points, cells = reader.read_points_cells()
    for k in range(reader.num_steps):
        t, point_data, cell_data = reader.read_data(k)

Interactive viewer

Try it in your browser

the meshio++ browser viewer

The browser viewer — reading, rendering and converting entirely client-side.

One call, two backends:

import meshioplusplus

mesh = meshioplusplus.read("part.msh")
meshioplusplus.view(mesh)                      # pick a backend automatically
meshioplusplus.view(mesh, backend="polyscope") # a native desktop window
meshioplusplus.view(mesh, backend="browser")   # vtk.js, in a browser or notebook

The desktop backend is Polyscope, an optional Python-only extra (pip install meshioplusplus[viewer]). It draws solids you can slice into, colours by any point or cell array, and renders headless screenshots for CI and docs:

meshioplusplus.screenshot(mesh, "part.png", color_by="temperature")
the example bracket in Polyscope, coloured by scaled Jacobian

The bundled example.msh bracket coloured by element quality — this image is generated by screenshot() itself.

The browser backend needs nothing extra. The same app is hosted as a live demo: drag in any supported format, colour by point or cell data, and convert and download to another format — all client-side, with no server and no upload. Since it runs the WebAssembly build, every format meshio++ reads works there too.

From the command line:

meshioplusplus view part.msh
meshioplusplus screenshot part.msh part.png --size 1600 1200

See the viewer docs for how volume meshes are handled and what each backend can and cannot do.

ParaView plugin

gmsh paraview *A Gmsh file opened with ParaView.*

If you have downloaded a binary version of ParaView, you may proceed as follows.

  • Install meshio++ for the Python major version that ParaView uses (check pvpython --version)
  • Open ParaView
  • Find the file paraview-meshioplusplus-plugin.py of your meshio++ installation (on Linux: ~/.local/share/paraview-5.9/plugins/) and load it under Tools / Manage Plugins / Load New
  • Optional: Activate Auto Load

You can now open all meshio++-supported files in ParaView.

Benchmarks

How much does the C++ core help? The benchmark/ folder times read/write conversions against the original pure-Python meshio on the formats both support (same in-memory mesh, same machine). The headline input is the bundled example.msh — a real Gmsh bracket (~52k nodes, ~293k cells).

meshio vs meshio++ speedup on example.msh

meshio++'s biggest wins are the parallel and text paths: VTU binary+zlib ~16× write (the zlib blocks run across cores via an OpenMP backend with dynamic scheduling — hybrid P+E-core CPUs load-balance too), VTU ASCII ~7× write / ~5× read, and mixed-topology XDMF read ~10×. The binary and HDF5 formats that used to be slower — VTK/Gmsh binary, UGRID, and MED — are now at or above parity after an optimisation pass (bulk-buffered binary I/O, single-instruction bswap endianness conversion, a real parallel backend, an Eigen-backed MED transpose, zero-copy cell reconstruction that moves the connectivity buffer straight into the mesh, and uninitialised reader buffers + thread-parallel block copies so nothing is written twice); binary reads now match or beat numpy's fromfile — Gmsh ~1.7×, single-type VTK ~1.45×, and even mixed-topology VTK ~1.1×. Output stays byte-identical throughout.

The speedup is per-element: text/parallel formats climb out of the small-mesh regime and plateau (large meshes realise the full speedup):

speedup vs mesh size

Full methodology and a reproducible notebook are on the Benchmarks doc page (source: benchmark/01_benchmark.ipynb).

Reading only what you need

import meshioplusplus

mesh = meshioplusplus.read("big.vtu", points_only=True)   # geometry, no data arrays
mesh = meshioplusplus.read("big.vtu", arrays=["u", "p"])  # only these arrays
meta = meshioplusplus.read_metadata("big.vtu")            # counts/names, no heavy arrays

VTU, VTP, XDMF and Gmsh skip the unwanted array bodies outright; other formats are read in full and filtered, and meta["fell_back_to_full_read"] says which happened. Large files can also be memory-mapped (automatic above 16 MiB), which roughly halves peak memory during a read. See selective reads and memory-mapped reading.

VTK XML output can additionally use lz4 (ParaView-readable) or zstd (a meshio++ extension) instead of zlib, when built with -DMESHIOPLUSPLUS_WITH_LZ4=ON / -DMESHIOPLUSPLUS_WITH_ZSTD=ON. zlib remains the default. See compression codecs.

Installation

meshio++ is available from the Python Package Index, so simply run

pip install meshioplusplus

to install.

Additional dependencies (netcdf4, h5py) are required for some of the output formats and can be pulled in by

pip install meshioplusplus[all]

For JavaScript / browser use, the C++ core also ships as a WebAssembly npm package covering 29 of the formats above:

npm install @meshioplusplus/wasm

See the WebAssembly / JavaScript doc page for usage and the format-support table.

C / Fortran API

For HPC codes written in C or Fortran, the C++ core also builds as an installable shared library (libmeshioplusplus, pure-C99 header, pkg-config + find_package support) with a modern OO Fortran 2008 module on top:

./build/configure.sh --fortran --tests --build     # --c-api for the C API alone
cmake --install build/cpp-release --prefix /opt/meshioplusplus

mio_mesh* m = mio_read("in.msh", NULL);
printf("%lld points\n", (long long)mio_mesh_num_points(m));
mio_write("out.vtu", m, NULL);
mio_mesh_free(m);

use meshioplusplus
type(mio_mesh) :: m
call m%read("in.msh")
call m%write("out.vtu")
call m%free()

The C API is also packaged for Conan (root conanfile.py) and vcpkg (overlay port under ports/meshioplusplus/), both driving the same install/find_package path:

conan create . -o meshioplusplus/*:with_hdf5=True
vcpkg install meshioplusplus --overlay-ports=ports

Full mesh access (build meshes from raw arrays, zero-copy readback) is covered on the C API and Fortran doc pages.

Single-header C++

The whole C++ core is also amalgamated into one self-contained, STB-style header — single_include/meshioplusplus/meshioplusplus.hpp — with pugixml bundled and no external dependencies by default. Drop it in, no CMake or linking required:

// in exactly ONE .cpp:
#define MESHIOPLUSPLUS_IMPLEMENTATION
#include "meshioplusplus/meshioplusplus.hpp"
// elsewhere: just #include it (declarations only)

g++ -std=c++20 -I single_include main.cpp

It is generated by ./tools/amalgamate.sh and kept in sync by CI. See the single-header doc page (optional HDF5/netCDF/zlib formats via MESHIOPLUSPLUS_HAS_* macros).

C++ mesh backends

Standalone C++ builds (no Python) can swap the in-memory mesh structure at compile time via MESHIOPLUSPLUS_MESH_BACKEND — every format works identically under each backend:

  • MESHIO (default; the Python extension and PyPI wheels always use it) — mirrors the Python meshio.Mesh;
  • NATIVE — the fastest pure-C++ structure (canonical Float64/Int64 storage, cell-type enum, CSR ragged blocks); the WebAssembly build uses it;
  • KRATOS — a Kratos Multiphysics-style ModelPart (Nodes/Elements/Conditions/SubModelParts) plus a header-only templated bridge that populates a real Kratos::ModelPart with no Kratos build dependency.
./build/configure.sh --mesh-backend NATIVE --tests --build

See the C++ mesh backends doc page.

Testing

To run the meshio++ unit tests, check out this repository, install it with the test extras, and type

pytest tests/

License

meshio++ is published under the MIT license.

Acknowledgements

meshio++ is a fork of meshio by Nico Schlömer and its contributors (MIT). meshio is where the Mesh data model, the cell-type naming, and the great majority of the format readers and writers come from; this fork adds a C++20 core, an operations layer, and the C/Fortran/WebAssembly bindings on top of that foundation. The original copyright is retained in LICENSE.

Some code and test fixtures also come from Simvia's meshlane fork of meshio (MIT), credited per-change in CITATION.cff and CHANGELOG.md.

The C++ core is dependency-free by design. Everything below is either optional, bundled, or confined to one binding or tool.

Runtime dependencies (Python)

Project Used for License
NumPy the array type the whole data model is built on BSD-3-Clause
Rich CLI output formatting MIT

Optional dependencies

Project Extra Used for License
Polyscope [viewer] the desktop viewer and screenshot() MIT
h5py [all] the Python fallback for CGNS, H5M, MED, XDMF BSD-3-Clause
netCDF4 [all] the Python fallback for Exodus MIT
KaHIP [kahip] / CMake the quality graph-partitioning backend MIT
zstandard, lz4 [codecs] the Python fallback for the optional VTK block codecs BSD-3-Clause / BSD-2-Clause

Bundled and build-time

Project Used for License
pugixml XML parsing in the C++ core (vendored in cpp/third_party/) MIT
Eigen the MED Fortran↔C transpose (git submodule, optional) MPL-2.0
pybind11 the Python bindings BSD-3-Clause
scikit-build-core the CMake-driven build backend Apache-2.0
Emscripten the WebAssembly build MIT / NCSA
GoogleTest the C++ test suite BSD-3-Clause
zlib, Zstandard, LZ4 optional compression codecs zlib / BSD-3-Clause / BSD-2-Clause
HDF5, netCDF optional native paths for HDF5/netCDF-backed formats BSD-3-Clause / MIT-like

Browser viewer (isolated under viewer/)

Project Used for License
vtk.js all rendering, colour maps and the scalar bar BSD-3-Clause
Vite the app build MIT
vite-plugin-singlefile the self-contained wheel-bundled build MIT
Playwright the end-to-end tests and the documentation screenshots Apache-2.0

Also

Kratos Multiphysics (BSD-3-Clause) is the source of the skin-detection algorithm, the EnSight writer logic, the KaHIP partitioning approach and the FindKaHIP.cmake module, all these 3 implementation are from the original author of this project as well. Also thanks to its ModelPart design informs the KRATOS mesh backend. VTK and Verdict (both BSD-3-Clause) define the mesh-quality formulas. The documentation is built with VitePress (MIT) and Doxygen (GPL-2.0, used as a tool only). The logo renders the Stanford Bunny ("Stanford Bunny — Digitized!" by MakerBot, CC-BY).

Thank you to all of them.

Project links

Data verified by PyPI on Jul 21, 2026
Data provided by the project maintainers, verified at the time the release was uploaded to PyPI.

Key dates

PyPI data
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  • Released:
Newer release available (10.17.0)

1 maintainer

PyPI data
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Avatar for loumalouomega from gravatar.com loumalouomega

Credits

Author: Vicente Mataix Ferrándiz

GitHub Statistics

Data verified by PyPI on Jul 21, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License

MIT License (The MIT License (MIT))

Requires

Python >=3.8

Provides Extra

codecs kahip viewer all

Tags

mesh file formats scientific engineering fem finite elements

Classifiers

Report project as malware

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MD5 05c345d4d7811d0bd3c3ac25997bd5a6
BLAKE2b-256 25b281dc547595da29fd0f593582f9c6e47c0ae39fe8f81b57632311e4526059

See more details on using hashes here.

Provenance

The following attestation bundles were made for meshioplusplus-7.10.0-cp39-cp39-macosx_13_0_arm64.whl:

Publisher: wheels.yml on loumalouomega/meshioplusplus

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

10.17.0

21 files

10.14.0

21 files

10.9.0

21 files

10.6.0

21 files

10.0.0

21 files

9.27.0

21 files

9.25.0

21 files

9.22.0

21 files

9.14.0

21 files

9.12.0

21 files

9.11.0

21 files

9.10.0

21 files

9.9.0

21 files

9.8.0

21 files

9.7.0

21 files

9.6.0

21 files

9.4.1

21 files

9.4.0

21 files

9.3.0

21 files

9.2.0

21 files

9.1.0

21 files

9.0.0

21 files

8.7.0

21 files

8.5.0

21 files

8.4.0

21 files

8.3.0

21 files

8.0.0

21 files

7.16.0

21 files

7.15.0

21 files

7.14.0

21 files

7.13.0

21 files

7.12.0

21 files

This release

7.10.0 This release

21 files

7.7.0

21 files

7.6.0

21 files

7.5.0

21 files

7.4.0

21 files

7.3.0

21 files

7.2.1

21 files

7.2.0

21 files

7.1.0

21 files

7.0.0

21 files

6.9.0

17 files

6.8.0

17 files

6.7.0

17 files

6.6.3

17 files

6.6.1

17 files

6.6.0

17 files

6.5.0

17 files

6.4.0

17 files

6.3.2

17 files

6.3.1

17 files

6.3.0

17 files

6.2.0

17 files

6.1.0

17 files

6.0.5

17 files

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