diff --git a/Standalone/Research/WorldAssemblerM3/Linux127/REPORT.md b/Standalone/Research/WorldAssemblerM3/Linux127/REPORT.md
new file mode 100644
index 0000000..19ccddc
--- /dev/null
+++ b/Standalone/Research/WorldAssemblerM3/Linux127/REPORT.md
@@ -0,0 +1,15 @@
+# Linux127 — smooth-tunnel merge
+
+Target: `aeb60bb` on `merge/smooth-tunnels`.
+
+Build, fast-tier, walkability, seam, floor, determinism, and capture checks pass. The UE moving comparison shows a repeatable coverage drop and is the item to review before landing.
+
+- Clang and GCC headless builds pass. UE builds pass: c743 baseline 157/157 actions; merge 29/29, using `-NoUBA -MaxParallelActions=4`.
+- Fast tier passes (259 checks; 5 diagnostic checks). Walkability is 21,425/21,425. Four seam pairs (4,900 shared samples) are bit-identical. Floor probe maximum is 7.884 mm.
+- All 18 owner4/owner2 Clang/GCC W1/W8/W12 hash runs match the L125 v225 baselines.
+- L80 timing protocol on a quiet machine (load 0.69, CPU idle 99.4%): five interleaved measurements per cell, W8/W12 across all four strates. Merge vs L125 is within -4.05% to +2.83% near-ready and -4.58% to +0.95% whole-view. Vs c743, S0 is slower (+10.90% to +14.33% near, +1.26% to +3.52% whole); the other six cells are faster.
+- UE startup reaches full LOD0–2 in all four strates: c743 2.232–2.726 s; merge 2.221–2.514 s. Far-apply CVar reads back as 1 and produces applies in every start and moving run.
+- Five 30 m/s movement runs per build: median near coverage 43.36% → 40.22%; far holes 3.14% → 3.46%; tick p99 11.25 → 10.80 ms; worst tick 13.97 → 13.27 ms. Both builds reach 100% near coverage and zero far holes after stopping. The lane works; moving coverage remains lower on the merge.
+- 23/23 L125 poses rendered and verified from the merge binary; 19 pass pixel quality, 4 show visible low-contrast geometry. See [`captures/INDEX.md`](captures/INDEX.md) and [`captures/COMPARE.html`](captures/COMPARE.html).
+
+No source fix was made. Logs and summaries are in `Saved/Linux/l127`. An early probe wrapper wrote to the L125 probe output; the L125 binary regenerated it, with restoration checksums recorded in `Saved/Linux/l127/restore-l125-probe.log`.
diff --git a/Standalone/Research/WorldAssemblerM3/Linux127/RunL127Captures.py b/Standalone/Research/WorldAssemblerM3/Linux127/RunL127Captures.py
new file mode 100644
index 0000000..8d34003
--- /dev/null
+++ b/Standalone/Research/WorldAssemblerM3/Linux127/RunL127Captures.py
@@ -0,0 +1,103 @@
+#!/usr/bin/env python3
+"""Render the exact 23 L119 camera views with the L127 merge candidate."""
+from __future__ import annotations
+
+import importlib.util
+import json
+import math
+import os
+import sys
+from pathlib import Path
+
+sys.dont_write_bytecode = True
+
+ROOT = Path(__file__).resolve().parents[4]
+RESEARCH = Path(__file__).resolve().parent
+CAPTURES = RESEARCH / "captures"
+SAVED = ROOT / "Saved/Linux/l127/captures"
+BASELINE_INDEX = (ROOT / "Standalone/Research/WorldAssemblerM3/Linux119"
+ / "captures/L119/capture-index.json")
+LAYOUT = ROOT / "Saved/Linux/l127/hashes/owner4-surface-world-w12-clang.layout.json"
+CLANG = ROOT / os.environ.get("L127_CAPTURE_CLANG",
+ "Saved/Linux/l127/bin-clang/VoxelForgeCoreHeadless-l127-clang")
+RENDERER = ROOT / os.environ.get("L127_CAPTURE_RENDERER",
+ "Saved/Linux/l127/bin-clang/VoxelForgeOffscreenCapture-l127-clang")
+HELPER_PATH = ROOT / "Standalone/Research/WorldAssemblerM3/Linux113/RunL113Captures.py"
+
+SPEC = importlib.util.spec_from_file_location("l113_capture_helpers", HELPER_PATH)
+if SPEC is None or SPEC.loader is None:
+ raise SystemExit("cannot load the verified L113 capture helpers")
+HELPERS = importlib.util.module_from_spec(SPEC)
+SPEC.loader.exec_module(HELPERS)
+HELPERS.RESEARCH = RESEARCH
+HELPERS.CAPTURES = CAPTURES
+HELPERS.SAVED = SAVED
+HELPERS.BINARIES = {"L127": CLANG}
+HELPERS.RENDERERS = {"L127": RENDERER}
+
+
+def main() -> int:
+ if any(not path.is_file() for path in (BASELINE_INDEX, LAYOUT, CLANG, RENDERER)):
+ raise SystemExit("missing L119 camera set, L127 layout, or capture binary")
+ baseline = json.loads(BASELINE_INDEX.read_text(encoding="utf-8"))
+ layout = json.loads(LAYOUT.read_text(encoding="utf-8"))
+ rows = []
+ CAPTURES.mkdir(parents=True, exist_ok=True)
+ SAVED.mkdir(parents=True, exist_ok=True)
+ for view in baseline["captures"]:
+ row = HELPERS.capture("L127", view, layout)
+ row["variant"] = "L127-merge-v225"
+ if view["kind"] == "rock-floor-close":
+ scene = ROOT / row["scene"]
+ anchor = HELPERS.nearest_surface_anchor(scene, view["target"], margin_m=5.0,
+ preferred_normal=(0.0, 0.0, 1.0), minimum_alignment=0.85)
+ alignment = HELPERS.dot(anchor["normal"], (0.0, 0.0, 1.0))
+ camera_distance = math.dist(row["camera_actual_m"], anchor["position_m"])
+ row.update({"floor_anchor_position_m": anchor["position_m"],
+ "floor_anchor_normal": anchor["normal"],
+ "closeup_camera_to_floor_distance_m": camera_distance,
+ "closeup_floor_normal_alignment": alignment,
+ "verified_upward_floor_normal": alignment >= 0.85})
+ if (not row["verified"] or not 2.0 <= camera_distance <= 3.2
+ or anchor["distance_m"] > 0.25 or alignment < 0.85
+ or row["drawn_triangles"] <= 0
+ or row["pixel_quality_status"] not in
+ ("pass", "low_contrast_geometry_visible")):
+ raise RuntimeError(f"L127 floor close-up failed at {view['name']}")
+ rows.append(row)
+ if len(rows) != len(baseline["captures"]) or len(rows) != 23:
+ raise RuntimeError(f"expected all 23 L119 views, captured {len(rows)}")
+ index = CAPTURES / "L127" / "capture-index.json"
+ index.parent.mkdir(parents=True, exist_ok=True)
+ index.write_text(json.dumps({"captures": rows}, indent=2) + "\n",
+ encoding="utf-8")
+
+ html = ["",
+ "L119 / L127 tunnel capture comparison",
+ "",
+ "L119 / L127 merge: identical views
"]
+ old_by_name = {Path(row["capture"]).name: row for row in baseline["captures"]}
+ for row in rows:
+ name = Path(row["capture"]).name
+ old = old_by_name[name]
+ old_path = os.path.relpath(ROOT / "Standalone/Research/WorldAssemblerM3/Linux119"
+ / old["capture"], CAPTURES)
+ new_path = os.path.relpath(RESEARCH / row["capture"], CAPTURES)
+ html.extend(["", f"{row['passage']} — {row['station']}
",
+ f"{row['kind']} · L119 {old['pixel_quality_status']} · "
+ f"L127 {row['pixel_quality_status']}
", "",
+ f"
L119
",
+ f"
L127 merge
",
+ "
L119 / L127 merge: identical views
+
+passage/0-1/0 — rock-floor/401.7m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — rock-floor/792.8m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — rock-floor/1634.5m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — rock-floor/27.0m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — rock-floor/52.9m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — rock-floor/78.9m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/2-3/0 — rock-floor/323.4m
+rock-floor-close · L119 low_contrast_geometry_visible · L127 low_contrast_geometry_visible
+
+
L119
+
L127 merge
+
passage/2-3/0 — rock-floor/333.4m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/2-3/0 — rock-floor/343.4m
+rock-floor-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — section-1/4m-outside
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — section-1/4m-interior-wall
+open-air-close · L119 low_contrast_geometry_visible · L127 low_contrast_geometry_visible
+
+
L119
+
L127 merge
+
passage/0-1/0 — section-2/4m-outside
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — section-2/4m-interior-wall
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — section-3/4m-outside
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/0-1/0 — section-3/4m-interior-wall
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — section-1/4m-outside
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — section-1/4m-interior-wall
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — section-2/4m-outside
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/1-2/0 — section-2/4m-interior-wall
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/2-3/0 — section-1/4m-outside
+open-air-close · L119 low_contrast_geometry_visible · L127 low_contrast_geometry_visible
+
+
L119
+
L127 merge
+
passage/2-3/0 — section-1/4m-interior-wall
+open-air-close · L119 low_contrast_geometry_visible · L127 low_contrast_geometry_visible
+
+
L119
+
L127 merge
+
passage/2-3/0 — section-2/4m-outside
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+
passage/2-3/0 — section-2/4m-interior-wall
+open-air-close · L119 pass · L127 pass
+
+
L119
+
L127 merge
+