VoxelForge/Standalone/Research/WorldAssemblerM3/Linux69/REPORT.md

Linux69 — owner four-strata captures and spawn trace

Captures

The L68 exports were limited to a small clip radius and LOD0 (max-clip-level=0, max-level=0). The camera frustum extended beyond those tiles, while the renderer cleared empty pixels to RGB (0.035, 0.055, 0.075). Unmeshed space therefore looked nearly black.

L69 exports use a 90° player-view frustum, radius 3 and LODs through 8. A coverage probe samples a 17×9 ray grid at 50 points per ray, every 4 m from 1 m through 197 m. Nine views needed one overlapping mesh patch. All 16 ended with zero uncovered probe samples. The renderer clear color is now sky blue (RGB (0.30, 0.48, 0.62)). A tile coverage failure aborts before rendering, so a missing export cannot silently become a black capture. This is a sampled coverage check, not a per-pixel proof.

The negative control removes 8 tiles from the strate 0 arrival mesh. It reports 480 uncovered samples and fails before rendering. Control mesh: Saved/Linux/l69/controls/strate0-arrival.truncated.vfmesh.

The coverage probe only answers whether mesh tiles cover its sampled frustum points. No real hole was confirmed in the captures. The engine trace blocker below is a solid passage sample. Blue pixels indicate an unoccluded ray through covered tiles; this round did not add a separate classifier for open sky versus a terrain breach.

All JPEGs are below 300 KB; combined size is 447,288 bytes.

Strate	View	File	Bytes	What it shows
0	Arrival	strate0-arrival.jpg	40,064	Player-eye view at the surface arrival, facing into the route.
0	Route	strate0-route.jpg	38,567	Player-height view along the surface route toward the passage.
0	Departure mouth	strate0-departure-mouth.jpg	35,055	Inside the upper mouth looking outward.
0	Overview	strate0-overview.jpg	23,395	Elevated view, 70 m above the arrival, looking down at the route.
1	Arrival	strate1-arrival.jpg	24,524	Player-eye view at the strate 1 arrival, facing into its route.
1	Route	strate1-route.jpg	29,602	Player-height view along the passage.
1	Departure mouth	strate1-departure-mouth.jpg	26,090	Inside the upper mouth looking outward.
1	Overview	strate1-overview.jpg	25,960	Elevated view, 70 m above the arrival, looking down at the route.
2	Arrival	strate2-arrival.jpg	20,339	Player-eye view at the strate 2 arrival, facing into its route.
2	Route	strate2-route.jpg	20,244	Player-height view along the passage.
2	Departure mouth	strate2-departure-mouth.jpg	33,125	Inside the upper mouth looking outward.
2	Overview	strate2-overview.jpg	25,668	Elevated view, 70 m above the arrival, looking down at the route.
3	Arrival	strate3-arrival.jpg	24,307	Player-eye view at the strate 3 arrival, facing into its route.
3	Route	strate3-route.jpg	23,966	Player-height view along the passage.
3	Departure mouth	strate3-departure-mouth.jpg	35,034	Inside the lower mouth looking outward.
3	Overview	strate3-overview.jpg	21,348	Elevated view, 70 m above the arrival, looking down at the route.

In-engine spawn trace

The host rebuilt successfully on Linux. The trace harness was prepared for 3 rotated/interleaved trials per strate, spawning at each arrival. No strate 0 attempt produced a valid Core trace; the other strata were not run. Engine metrics are therefore unavailable, including walkable ring, LOD0 ring, full set, worker-seconds, LOD0 p50/p95, and generateTile / mesh-copy / RMC timings.

Strate	Arrival spawn (m)	Headless whole-view median	Valid engine trials	Walkable ring	LOD0 ring	Full set	Worker-s	LOD0 p50 / p95	generateTile / mesh copy / RMC
0	(0, 0, -374.939)	1.074 s	0/3 (attempts blocked)	N/A	N/A	N/A	N/A	N/A	N/A
1	(25.837, 3.199, -737.000)	1.503 s	0/3 (not run)	N/A	N/A	N/A	N/A	N/A	N/A
2	(19.166, -14.200, -753.374)	0.577 s	0/3 (not run)	N/A	N/A	N/A	N/A	N/A	N/A
3	(-20.063, -5.068, -900.354)	0.210 s	0/3 (not run)	N/A	N/A	N/A	N/A	N/A	N/A

No engine/headless percentage comparison is available, so no >30% gap can be assessed. The default engine-generated four-strate plan failed passage validation at the solid Core voxel (-172, -138, -1794) (25 cm per voxel; approximately (-43.0, -34.5, -448.5) m). This is a blocked centerline point, not a hole. The saved owner manifest lacked layout_chunk_width_q; regenerating and combining its current SurfaceWorld plan with the saved FloatingIslands plan got past parsing, but UE rejected the island plan bounds. The imported slot is strate 1 chunks [-79, -16], while the live slot resolves to [-93, -64]. A floating-islands-only headless export also failed because it could not resolve a SurfaceWorld strate. I stopped without bypassing the production checks.

Failed runs and build notes

• Radius 4 exports, with max clip level 8 and then 7, exceeded the 160-million-node shape safety bound. Radius 3 plus overlapping patches covered the views.
• The UE host toolchain failed under the 6 GiB address-space limit during CoreCLR startup, so host build and UE runs used the requested 6 GiB RSS limit. The host build passed after using the local VFHost/PluginDeps plugin mirror; the final incremental build compiled the spawn-coordinate parser.
• The first UE trace launch exposed comma parsing in the new spawn argument. The parser was corrected and the host rebuilt. One RSS-capped launch exited when AndroidFileServer failed to map; disabling that unrelated plugin let the commandlet run. The generated-settings plan hit the solid-centerline failure above. Manifest attempts then encountered the stale schema and stale island bounds; none reached valid spawn tracing.
• No attempted run exceeded 30 minutes. Logs are under Saved/Linux/l69.

No world recipe, geometry, or peer-determinism inputs changed. The only Source/ edit is Source/VoxelForgeEditor/Private/VoxelForgeExploreCommandlet.cpp, adding a finite XYZ spawn override for the trace; it compiled in the Linux host build. Standalone/Source/StreamBenchmarkHeadless.cpp also writes the canonical manifest after plan assembly for trace setup; its Linux rebuild passed. Other capture-only edits are in Standalone/Source/LinuxOffscreenCapture.cpp and Standalone/Source/StreamBenchmarkPipeline.h.