Bounded smooth blends at junctions (3.1% of cells), QEF dual contouring on the exact crossings and
analytic normals, band-limited surface relief (bound 0.60 m, observed 0.40-0.44 m, R toggles it),
sparser strata. Exact signs vs the blended reference at every node, thin features kept, same hash
across worker counts. Mesh has 0 boundary edges but 3-7 overused edge groups: not collision-ready.
Near CPU total, 6 workers: 241 -> 836 ms. The new stages all run on ONE thread: blend index 186 ms,
blend evaluation 201 ms, dual contouring 322 ms, relief 61 ms.
Look: slab stack gone, joins rounder; chambers read as broad crumpled facets, junction seams still
flaky. Viewer built as interval_viewer2.exe (the owner had the first one open).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ
Standalone C++20 (MSVC /O2 /arch:AVX2), no Unreal. A 372-shape corpus (rooms at the hardest
profile's scale, winding tunnels, pillars, stalactites, shelves, floating masses, thin strata,
rotated shapes, crowded junctions, craters), built two ways: point-by-point reference vs column
intervals on 3 axes + 64-bit sign words + bit-scanned active cells + meshing from analytic crossings.
64 m near region at 25 cm (17.4 M nodes), 5 seeds, fresh processes:
workers near CPU total (median/p95/worst) interval stage mesh stage (single-threaded)
1 349 / 358 / 358 ms 154 ms 188 ms
6 241 / 280 / 288 ms 48 ms 191 ms
8 240 / 271 / 277 ms 43 ms 193 ms
Near mesh ~563k triangles, 13.5 MB; total output 19.9 MB; busiest line 58 candidates (< 64).
Correctness: 0 sign mismatches vs reference at every node, 0 missing crossings/open contours, thin
strata with no lattice node inside get explicit triangles (dropping them is caught), same hash on
1/6/8 workers and a repeated run. Far field: 47k nodes / 92k patches in ~8.6 ms, but fixed-grid
ellipsoid sheets, not a validated cave hierarchy: unproven. No noise detail in this corpus.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ
Fr0zkaandClaude Opus 5.5