Summary

Add a utility to convert Netgen .vol mesh files to Gmsh .msh and VTK .vtu formats.

Replaces #87, which contained unrelated files.

Changes

3 files added in utils/vol_to_gmsh/:

• vol_to_gmsh.py - Converter supporting Gmsh 2.x and VTK formats
• test_vol_to_gmsh.py - pytest test suite
• README.md - Usage documentation

Usage

# As a script
python utils/vol_to_gmsh/vol_to_gmsh.py mesh.vol          # -> mesh.msh
python utils/vol_to_gmsh/vol_to_gmsh.py mesh.vol --vtk     # -> mesh.vtu

# As a library
from vol_to_gmsh import convert_vol_to_gmsh, convert_vol_to_vtk
convert_vol_to_gmsh("mesh.vol", "output.msh")

Test plan

• pytest utils/vol_to_gmsh/test_vol_to_gmsh.py -v
• Verify Gmsh format output contains $MeshFormat, $Nodes, $Elements
• Verify VTK .vtu output is valid