SQMesh is an open-source CAD-to-CFD/FEA meshing toolkit — STEP/IGES import, surface and volume meshing, boundary layers, and Python/C++ integration in one SDK. Maintained by Suzhou AI Lab and Shuqian Tech.

• Geometry — STEP / IGES / STL import, OCC-free access layer (topology traversal, UV queries, projection, curvature sampling)
• Surface meshing — Auto CFD Surface Mesher (sizing-field driven, honors minimum_length / maximum_length / distortion_angle / growth_rate / proximity)
• Volume meshing — Tetrahedral Volume Mesher
• Boundary-layer meshing — Boundary Layer Mesher with prismatic inflation for CFD workflows
• Mesh I/O — MSH 2.2 / 4.1, OBJ, NASTRAN, optional CGNS
• C++17 SDK with Python bindings (sqmesh.base / sqmesh.geo / sqmesh.mesh)

• CMake ≥ 3.20
• A C++17 compiler (MSVC 2019+ on Windows, GCC 9+ / Clang 10+ on Linux/macOS)
• Python ≥ 3.9 (only if -DSQMESH_BUILD_PYTHON_BINDINGS=ON)

On Windows the easiest route is vcpkg:

# one-time vcpkg bootstrap
git clone https://github.com/microsoft/vcpkg.git C:\vcpkg
C:\vcpkg\bootstrap-vcpkg.bat

# install SQMesh's dependencies for the x64 Windows triplet
C:\vcpkg\vcpkg install opencascade:x64-windows spdlog:x64-windows
# (optional) CGNS I/O
C:\vcpkg\vcpkg install cgns:x64-windows

On Linux / macOS, use the system package manager or vcpkg classic mode:

# Ubuntu / Debian
sudo apt install libocct-foundation-dev libocct-modeling-algorithms-dev \
                 libocct-modeling-data-dev libocct-data-exchange-dev \
                 libspdlog-dev libcgns-dev

# macOS (Homebrew)
brew install opencascade spdlog cgns

Pass the vcpkg toolchain so CMake's find_package(OpenCASCADE) / find_package(spdlog) resolve against the installed packages:

cmake -S . -B build_occ ^
  -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake ^
  -DVCPKG_TARGET_TRIPLET=x64-windows ^
  -DSQMESH_ENABLE_OCC=ON ^
  -DSQMESH_BUILD_TESTS=ON ^
  -DCMAKE_BUILD_TYPE=Release
cmake --build build_occ --config Release -j
ctest --test-dir build_occ -C Release --output-on-failure

On Linux / macOS drop the VCPKG_TARGET_TRIPLET and use forward slashes:

cmake -S . -B build_occ \
  -DCMAKE_TOOLCHAIN_FILE=$HOME/vcpkg/scripts/buildsystems/vcpkg.cmake \
  -DSQMESH_ENABLE_OCC=ON -DSQMESH_BUILD_TESTS=ON \
  -DCMAKE_BUILD_TYPE=Release
cmake --build build_occ -j

If you installed OCCT / spdlog without vcpkg (system packages, manual install), drop the toolchain line and instead point CMake at the install roots via CMAKE_PREFIX_PATH / OpenCASCADE_DIR / CASROOT.

Mesh a STEP / IGES file end to end with the bundled example:

./build_occ/examples/Release/surface_mesh_example \
    path/to/model.step <min_length> <max_length> [distortion_angle] [growth_rate] [proximity]

The output is a surface mesh (surface_mesh.obj) in the current directory. To generate a volume mesh with boundary layers, use volume_mesh_example:

./build_occ/examples/Release/volume_mesh_example \
    path/to/model.step <min_length> <max_length> <distortion_angle> \
    <growth_rate> <proximity> <auto_topo> \
    <bl_first_height> <bl_growth_rate> <bl_num_layers> \
    <tet_max_length> <tet_growth_rate> <material_point> [bl_mode] [bl_aspect]

Link against the C++ SDK in your own project by including <sqmesh/sqmesh.hpp> and the sqmesh CMake target. See examples/surface_mesh_example.cpp and examples/volume_mesh_example.cpp for complete references covering context setup, geometry import, surface meshing, volume meshing, and mesh export.

SQMesh is licensed under GNU Affero General Public License v3.0 or later — see LICENSE. Third-party components and attribution are documented in NOTICE and THIRD_PARTY_LICENSES.md.

The original contributor list before this public release is preserved below:

• Ruihan Zhang (@alderpaw)
• Wu Ping (@pingwusu)