The outcrop machinery (3-D: #525/#526; 2-D: PR #552) is restricted to axis-aligned box walls, and the restriction is ours, not gmsh's. OCC's intersect clips against any tool solid — a disk, cylinder, or revolved shell works exactly like addBox — and gmsh can mesh cap patches on curved OCC surfaces or in a local chart. What blocks a curved outcrop (a fault daylighting on an annulus top, a spherical surface) is that the wall is represented as the pair (axis, value) threaded through everything:
- band identification is coordinate-equality against the plane/line value (
_split_skin_band);
- the post-mesh snap is per-axis (
_occ_assembly_2d / _occ_assembly_3d);
- the carve's open-wall tests are
X[:, axis] == value (victim protection, ring checks, the 2-D splice, the 3-D bowl);
- the 3-D cap is meshed flat in the wall plane's uv coordinates.
Generalising means replacing the pair with a small wall descriptor — implicit function for membership, projection for the snap, chart for the cap — a bounded refactor: one concept, several touch points, each already isolated behind a named test in the 2-D path.
The annulus fault studies are the first customer. Corner/box-edge outcrop (a zone meeting two walls) is a separate, genuinely harder problem and stays refused regardless.
Underworld development team with AI support from Claude Code
The outcrop machinery (3-D: #525/#526; 2-D: PR #552) is restricted to axis-aligned box walls, and the restriction is ours, not gmsh's. OCC's
intersectclips against any tool solid — a disk, cylinder, or revolved shell works exactly likeaddBox— and gmsh can mesh cap patches on curved OCC surfaces or in a local chart. What blocks a curved outcrop (a fault daylighting on an annulus top, a spherical surface) is that the wall is represented as the pair(axis, value)threaded through everything:_split_skin_band);_occ_assembly_2d/_occ_assembly_3d);X[:, axis] == value(victim protection, ring checks, the 2-D splice, the 3-D bowl);Generalising means replacing the pair with a small wall descriptor — implicit function for membership, projection for the snap, chart for the cap — a bounded refactor: one concept, several touch points, each already isolated behind a named test in the 2-D path.
The annulus fault studies are the first customer. Corner/box-edge outcrop (a zone meeting two walls) is a separate, genuinely harder problem and stays refused regardless.
Underworld development team with AI support from Claude Code