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  • 1 commit
  • 2 files changed
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Commits on Sep 24, 2026

  1. geometry-mesh-lib: new triangle-mesh geometry library (STL/OFF/PLY) 

    New library in the style of interoff-lib, based on the mesh support of
Union_mesh / union-lib, not (yet) a drop-in replacement for either:

* Readers: STL ASCII and binary (binary detected from the file size, so
  headers starting with "solid" work), OFF/NOFF/COFF with polygons of any
  size and per-face properties, PLY ascii/binary little/big endian with
  extra elements/properties skipped and scalar face properties kept.
  STEP is rejected with a message to export STL/OFF/PLY.
* Init: scale (e.g. 1e-3 for mm), interoff-style resize/centre, hash-based
  vertex welding (O(N)), ear-clipping triangulation (non-convex polygons),
  unit normals, area, volume, topology (edges, boundary / non-manifold
  edges, Euler characteristic), consistent orientation with outward
  normals for closed meshes, bounding box/sphere, BVH.
* Ray tracing: gmesh_intersect (all hits sorted, caller-sized buffer, no
  allocation per ray), gmesh_intersect_t0t3 (off_intersect convention),
  gmesh_inside (deterministic parity test, no random numbers). Hits on
  shared edges/vertices are reported once; parallel rays never give
  inf/NaN hits.
* gmesh_display (each polygon edge once, or JSON polyhedron),
  gmesh_face_prop, gmesh_print_info, gmesh_free.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01BJS7ARkNN9yyhSDmmigudu
    Peter Willendrup @claude
    Peter Willendrup and claude committed Sep 24, 2026
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