forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
e4290c7366
Profile-driven (thin-ribs: 76% of the improvement in the topological operations, most of it in face removal walking whole edge rings to find one neighbour; pinhole-block: 44% in the smoothing passes). Same results, less work: - face removal finds the sandwiched face across a ring edge through the tetrahedron it already holds (O(1) instead of an edge ring), keeps the candidate tetrahedra of ring edges between rounds and updates the removed worst incrementally; - Klincsek's table for edge removal starts at the quality to beat, so triangles that cannot help are never evaluated; - a change clock per vertex: a topological operation (per tetrahedron, per edge, per face and side) or a smoothing that failed is not tried again until a tetrahedron it reads changes (exact: the operations are functions of that region; checked by re-running them); - the quality of a live tetrahedron is cached per slot until one of its vertices is touched; - smoothing line searches stop at the first tetrahedron that does not beat the worst, and gradients are computed only near the worst; - the journal saves the free list's tail instead of the whole list. For the clock to be exact, the quality is the same bits for every listing of a tetrahedron with the same orientation (corners in a canonical even order), and a closed edge ring starts at its smallest vertex. Changed results: - smoothing uses the analytic gradient of the smallest dihedral sine (Klingner and Shewchuk 2007 §3.1; Freitag and Ollivier-Gooch 1997) instead of central differences (kept for flat or inverted tetrahedra); - the composite insertion runs its topological passes on the new vertex's tetrahedra below the threshold, and smooths the neighbours whose star has one, as the passes do. Tests: analytic gradient against central differences, quality the same for every even reordering, cached qualities equal fresh ones after improvement, rollbacks restore every slot; the washer fingerprint moves (the same on arm64 and x86-64). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo