VoxelForge/Standalone/Research/WorldAssemblerM3/Linux91/REPORT.md

Linux 91 — passage source floor

Acceptance bar declared before measurement

For every owner stratum and LOD0–2: zero density sign flips, maximum edge-interpolated surface displacement ≤1 cm, maximum paired mesh-vertex normal-angle change ≤2°, and all passage audits passing. Capture and inspect moved surfaces. Measure source-field gradients at surface crossings. Apply any candidate floor only to the source passed into passage composition, preserving other field features.

Result

No tested floor is acceptable; stop before the census and prototype. The comparison clamped only the passage-composition source. Each floor changed samples and meshes, so this is not a no-op. Each stratum covered its full desired near set at LOD0–2: S0 1,408 tiles (512/448/448); FI 1,216 (512/448/256); TN 1,344 (512/448/384); S3 1,344 (512/448/384). There were 174,736,448 total density samples per floor across the four strata.

The 0.25 m core voxel makes the proposed reach c·Q + 0.24 m: c=2/3/4/6 gives 0.74/0.99/1.24/1.74 m. No smallest acceptable c exists.

c (vox)	Stratum	Changed samples	Sign flips	Max / mean displacement (cm)	Max normal change (°)	Changed mesh tiles
2	S0	22.17M	212	89.72 / 1.62	36.65	237
2	FI	25.76M	124	91.67 / 1.06	84.80	155
2	TN	16.46M	124	95.01 / 1.54	79.33	164
2	S3	4.03M	0	185.92 / 9.47	116.43	198
3	S0	21.98M	121	71.62 / 0.81	34.46	210
3	FI	25.66M	54	72.08 / 0.47	80.24	147
3	TN	16.36M	54	76.92 / 0.67	80.24	151
3	S3	4.01M	0	180.36 / 6.60	118.75	189
4	S0	21.79M	91	58.19 / 0.38	35.29	141
4	FI	25.55M	6	59.35 / 0.16	82.15	107
4	TN	16.27M	6	62.94 / 0.24	82.15	134
4	S3	3.99M	0	175.11 / 4.60	120.47	189
6	S0	21.40M	65	38.24 / 0.08	35.24	121
6	FI	1.67M	0	43.78 / 0.04	81.05	101
6	TN	2.52M	0	43.78 / 0.05	81.05	128
6	S3	2.23M	0	165.43 / 1.88	120.10	180

The route-near moved-crossing classifier tagged wall/floor/mouth changes at every floor. Totals across strata (wall, floor, mouth, other) were: c2 (4,806, 2,527, 7,587, 96,946); c3 (3,547, 2,046, 7,343, 81,736); c4 (2,215, 1,371, 7,252, 70,981); c6 (665, 272, 2,461, 33,139). These region labels use nearest-route-chord heuristics. Normal maxima compare index-paired vertices; normal changes in tiles with incompatible vertex/index pairing were unmeasured (183/151/141/112 tiles for c2/c3/c4/c6).

The source gradient is near distance-like at the median, but has steep outliers. Central differences use a 1-voxel step at source |d|≤2 crossings outside the approximate passage region:

| Stratum | Samples | p50 / p90 / max |∇d| (vox/vox) | |:---|---:|---:| | S0 | 7,137 | 1.205 / 1.815 / 4.741 | | FI | 1,929 | 1.001 / 511.674 / 893.726 | | TN | 2,142 | 0.993 / 1.047 / 893.726 | | S3 | 3,079 | 0.932 / 1.036 / 444.254 |

Thus the distance-field hypothesis holds around the median, not across the measured tails. Even c6 still has 65 sign flips overall, up to 165.43 cm displacement, and up to 120.47° paired normal change. S3 has zero flips at every floor but substantial crossing motion, showing that sign preservation alone does not bound the surface change.

Matched baseline/c6 captures were generated for all four strata at the audit cameras: S0, FI, TN, S3, with corresponding *-c6.png files beside them. The views are qualitative and do not resolve the measured local shifts.

Census, prototype, readiness

The L90 census was not rerun at 2 m or 4 m bricks because no acceptable c was found. The compiled evaluator prototype on passage/1-2/0 and W8/W12 LOD0–2 timing were not run. Passage walkability audits were not run after the effect gate failed. No production clamp was adopted; its diagnostic floor defaults off and is confined to passage composition. Therefore no version bump, hash repin, or fast-tier/same-world adoption run was made. Same-world peers and cross-compiler equality remain unmeasured for the rejected candidate. Existing production hashes/default behavior were not intentionally changed.

Runs and evidence

• Clang 19 standalone build passed; source stamp: 93fac418c7497299b43bd183625ba2117ec8096b2daeb6ea2f74f0171b348597.
• All four clamp audits covered the expected complete near tile sets, with zero generation failures and invalid comparisons. Their exit code 14 marks the threshold failure, not a crash.
• All 16 baseline/c6 export and capture steps passed. No process exceeded 30 minutes. All headless runs used taskset -c 0-11 and prlimit --as=6442450944.
• The first standalone build launch failed before compiling because its log directory did not exist; after creating it, the Clang build passed. No Unreal build was run because the clamp failed the effect gate before production integration.
• Detailed counts/logs: Saved/Linux/l91/clamp-effects/; captures/logs: Saved/Linux/l91/captures/; census runner remains unexecuted at RunL91CandidateCensus.py.