fix(renderer): drain threaded loads on shutdown

Reviewed-on: #6

RENDER.md

@@ -2,6 +2,10 @@
 
 Воспроизводимый renderer baseline для текущей цели M00, regression manifest, метрики и правила сравнения описаны в [`docs/RENDER_BASELINE.md`](docs/RENDER_BASELINE.md). Baseline фиксирует текущее поведение и известные расхождения, но не заявляет parity с WoW 3.3.5a.
 
+Парные checkpoint PNG можно автоматически проверить через `src/tools/compare_render_checkpoints.gd`; reference-снимки оригинального клиента остаются вне Git, а автоматический tolerance не заменяет human fidelity approval.
+
+Paired run 2026-07-11 подтвердил крупный coordinate/placement gap: некоторые server-derived camera positions оказываются под terrain или внутри WMO/rocks OpenWC. До исправления этого расхождения perceptual metrics измеряют также несовпадение композиции, а не только материалы и свет.
+
 Цель renderer-работы в этом проекте: добиться ощущения производительности оригинального клиента WoW 3.3.5a в Godot, без видимых фризов при переходе ADT -> ADT и без постоянного отката видимых участков к низкому качеству.
 
 Этот документ фиксирует текущее состояние рендера, сделанные оптимизации и практические правила дальнейшей работы.

coordination/claims/M00-QAR-CAMERA-OCCLUDERS-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-CAMERA-OCCLUDERS-001 — Camera occluder diagnostic
+
+<!-- OPENWC_CLAIM:M00-QAR-CAMERA-OCCLUDERS-001:sindo-main-codex:2026-07-13 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-camera-occluders`
+- Lease expires UTC: 2026-07-13
+- Integrator: milestone integrator
+
+## Outcome
+
+Report scene-tree M2/WMO geometry that contains calibrated cameras or intersects each camera-to-target segment.
+
+## Non-goals
+
+- Changing placements, cameras, FOV, culling, or renderer behavior.
+- Claiming full coverage of RenderingServer RID-only instances.
+- Implementing a production visibility or collision service.
+
+## Paths
+
+- Exclusive: `src/tools/probe_render_camera_occluders.gd`
+- Shared/hotspots: renderer baseline documentation
+- Generated/ignored: local JSON probe reports
+
+## Contracts and data
+
+- Public API/events: headless diagnostic CLI only
+- Schema/format version: report schema 1
+- Migration/compatibility: none
+- Consumers: M00 fidelity workflow
+
+## Dependencies
+
+- Requires: calibrated five-point manifest and streaming scene
+- Blocks: placement versus camera-composition classification
+- External state: local extracted/cache data
+
+## Verification
+
+- Commands: camera occluder probe, coordination and documentation gates
+- Fixtures: five calibrated camera/target segments
+- Fidelity evidence: scene-tree bounds at paired build 12340 viewpoints
+- Performance budget: offline diagnostic
+
+## Documentation deliverables
+
+- Inline public API docs: probe header and output fields
+- Module specification: verification/source map
+- Data-flow diagram: occluder probe flow
+- Sequence/state/dependency diagrams: synchronous diagnostic; not applicable
+- Source map/status updates: baseline findings
+
+## Simplicity and naming
+
+- Important names introduced: `camera_containing_geometry`, `segment_intersecting_geometry`
+- Simplest considered solution: transformed published AABBs
+- Rejected complexity/abstractions: GPU visibility readback or new BVH
+- Unavoidable complexity and justification: RID-only geometry cannot be named by this probe
+- Measured optimization evidence: not applicable
+
+## Status
+
+- State: ready
+- Done: five-point scene-tree AABB probe, containment/intersection classification and documentation
+- Next: integrator review; calibrate reproducible reference camera direction/FOV separately
+- Blocked by:
+
+## Handoff
+
+- Commit: branch HEAD
+- Results: zero containing geometry at all five cameras; expected WMO/liquid target intersections; ADT/dense segments unobstructed
+- Remaining risks: RID-only instances are excluded; manual reference direction and FOV were not recorded exactly
+- Documentation updated: `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`

coordination/claims/M00-QAR-CAPTURE-SHUTDOWN-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-CAPTURE-SHUTDOWN-001 — Capture shutdown drain
+
+<!-- OPENWC_CLAIM:M00-QAR-CAPTURE-SHUTDOWN-001:sindo-main-codex:2026-07-14 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-capture-shutdown`
+- Lease expires UTC: 2026-07-14
+- Integrator: milestone integrator
+
+## Outcome
+
+Eliminate the reproducible capture-tool ObjectDB leak by completing owned threaded resource requests and draining deferred scene deletion before process exit.
+
+## Non-goals
+
+- Refactoring renderer resource ownership.
+- Hiding genuine RID or worker-task leaks.
+- Changing capture images, metrics, or streaming behavior.
+
+## Paths
+
+- Exclusive: capture tool shutdown sequence
+- Shared/hotspots: renderer baseline documentation
+- Generated/ignored: verbose Godot logs
+
+## Contracts and data
+
+- Public API/events: none
+- Schema/format version: unchanged
+- Migration/compatibility: none
+- Consumers: M00 baseline runner
+
+## Dependencies
+
+- Requires: reproducible verbose leak diagnostic
+- Blocks: clean M00 capture shutdown evidence
+- External state: none
+
+## Verification
+
+- Commands: identical verbose dry-run before/after, M00 dry-run, repository gates
+- Fixtures: ADT-boundary filtered capture
+- Fidelity evidence: no visual behavior change
+- Performance budget: blocking resource completion is restricted to shutdown; two SceneTree drain frames only
+
+## Documentation deliverables
+
+- Inline public API docs: shutdown rationale comment
+- Module specification: recovery/known-risk update
+- Data-flow diagram: unchanged
+- Sequence/state/dependency diagrams: shutdown sequence documented in baseline
+- Source map/status updates: baseline evidence
+
+## Simplicity and naming
+
+- Important names introduced: none
+- Simplest considered solution: await two SceneTree frames after `queue_free` and finish registered in-flight ResourceLoader requests during loader shutdown
+- Rejected complexity/abstractions: resource registry or manual child traversal
+- Unavoidable complexity and justification: deferred deletion requires frame drain
+- Measured optimization evidence: not applicable
+
+## Status
+
+- State: ready-for-review
+- Done: one leaked RefCounted reproduced; isolation attributed it to `StreamingWorldLoader`; active threaded tile request was confirmed as the retained object; all owned threaded resource registries now finish in-progress requests before clearing; two identical verbose ADT-boundary runs and the full M00 dry-run completed without ObjectDB leak diagnostics
+- Next: integrator review and merge
+- Blocked by:
+
+## Handoff
+
+- Commit: this work-package commit
+- Results: verbose filtered capture returned one report and zero `Leaked instance`/`ObjectDB instances leaked` lines on two consecutive runs; `run_render_baseline.ps1 -DryRun` passed all gates and seven checkpoints
+- Remaining risks:
+- Documentation updated: `docs/modules/world-renderer.md` shutdown sequence, ownership contract, recovery table and known-risk status

coordination/claims/M00-QAR-COORD-CALIBRATION-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-COORD-CALIBRATION-001 — Renderer coordinate calibration
+
+<!-- OPENWC_CLAIM:M00-QAR-COORD-CALIBRATION-001:sindo-main-codex:2026-07-13 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-coordinate-calibration`
+- Lease expires UTC: 2026-07-13
+- Integrator: milestone integrator
+
+## Outcome
+
+Record the five observed build 12340 camera positions as non-proprietary golden coordinates and determine whether the existing WoW/Godot position formula round-trips them.
+
+## Non-goals
+
+- Introducing the M01 production `CoordinateMapper` contract.
+- Changing terrain, placement, WMO, liquid, or streaming behavior.
+- Claiming camera composition parity from coordinate round-trip alone.
+
+## Paths
+
+- Exclusive: `src/tools/verify_render_coordinate_calibration.gd`
+- Shared/hotspots: `src/tools/render_baseline_manifest.json`, renderer baseline documentation
+- Generated/ignored: original-client screenshots and local reports
+
+## Contracts and data
+
+- Public API/events: none; headless diagnostic only
+- Schema/format version: additive checkpoint calibration metadata, manifest schema remains 1
+- Migration/compatibility: existing capture consumers ignore additive fields
+- Consumers: M00 fidelity workflow and future M01 golden fixtures
+
+## Dependencies
+
+- Requires: five accepted original-client build 12340 viewpoints
+- Blocks: diagnosis of paired camera/placement mismatch
+- External state: screenshots remain outside Git
+
+## Verification
+
+- Commands: coordinate calibration probe, baseline manifest, coordination and documentation gates
+- Fixtures: five `reference_wow_camera` values in renderer manifest
+- Fidelity evidence: positions were observed in build 12340 during the paired session
+- Performance budget: negligible headless arithmetic
+
+## Documentation deliverables
+
+- Inline public API docs: diagnostic script header
+- Module specification: renderer verification/source map update
+- Data-flow diagram: baseline calibration flow update
+- Sequence/state/dependency diagrams: not applicable; stateless synchronous probe
+- Source map/status updates: renderer module and baseline document
+
+## Simplicity and naming
+
+- Important names introduced: `reference_wow_camera`, `maximum_round_trip_error`
+- Simplest considered solution: direct formula probe over manifest fixtures
+- Rejected complexity/abstractions: production domain mapper before M01
+- Unavoidable complexity and justification: none
+- Measured optimization evidence: not applicable
+
+## Status
+
+- State: ready
+- Done: five golden camera points, headless round-trip probe, runner integration and documentation
+- Next: integrator review; diagnose terrain height/placement/composition separately
+- Blocked by:
+
+## Handoff
+
+- Commit: branch HEAD
+- Results: five points passed with maximum mapping/round-trip error 0.000015
+- Remaining risks: correct position arithmetic does not prove terrain height, placement or camera direction parity
+- Documentation updated: `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`

coordination/claims/M00-QAR-FOV-SWEEP-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-FOV-SWEEP-001 — Empirical camera FOV sweep
+
+<!-- OPENWC_CLAIM:M00-QAR-FOV-SWEEP-001:sindo-main-codex:2026-07-14 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-fov-sweep`
+- Lease expires UTC: 2026-07-14
+- Integrator: milestone integrator
+
+## Outcome
+
+Support a bounded empirical FOV sweep when build 12340 does not expose a readable camera FOV CVar.
+
+## Non-goals
+
+- Claiming exact WoW FOV from a single manually aimed screenshot.
+- Changing runtime player camera defaults.
+- Automating yaw/pitch registration or image warping.
+
+## Paths
+
+- Exclusive: FOV/filter CLI additions in checkpoint tools
+- Shared/hotspots: renderer baseline documentation
+- Generated/ignored: local sweep PNGs and JSON reports
+
+## Contracts and data
+
+- Public API/events: additive `--camera-fov` and comparator `--only` CLI options
+- Schema/format version: unchanged
+- Migration/compatibility: existing commands retain defaults
+- Consumers: M00 fidelity workflow
+
+## Dependencies
+
+- Requires: build 12340 reference JPG and paired-image comparator
+- Blocks: empirical projection ranking
+- External state: original screenshots remain outside Git
+
+## Verification
+
+- Commands: synthetic comparator test, capture dry-run with override, bounded real sweep
+- Fixtures: `elwynn_adt_boundary` reference
+- Fidelity evidence: ranked perceptual metrics with manual-direction limitation
+- Performance budget: offline diagnostic
+
+## Documentation deliverables
+
+- Inline public API docs: CLI headers
+- Module specification: verification/source map if needed
+- Data-flow diagram: FOV sweep flow
+- Sequence/state/dependency diagrams: not applicable
+- Source map/status updates: baseline findings
+
+## Simplicity and naming
+
+- Important names introduced: `camera_fov_override`, `only_filter`
+- Simplest considered solution: reuse capture and comparator
+- Rejected complexity/abstractions: computer vision registration framework
+- Unavoidable complexity and justification: multiple captures are required because client FOV is inaccessible
+- Measured optimization evidence: not applicable
+
+## Status
+
+- State: ready
+- Done: client FOV access audit, capture override, comparator filter/regression, dedicated-camera ownership fix and bounded sweep
+- Next: integrator review; obtain reproducible yaw/pitch/zoom metadata before changing normative FOV
+- Blocked by:
+
+## Handoff
+
+- Commit: branch HEAD
+- Results: corrected ranking 26=0.079588, 38=0.079633, 50=0.084353, 62=0.088360, 86=0.097993; plateau is inconclusive
+- Remaining risks: build 12340 FOV is inaccessible through tested APIs; manual direction/framing dominates metrics
+- Documentation updated: `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`

coordination/claims/M00-QAR-TERRAIN-HEIGHT-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-TERRAIN-HEIGHT-001 — Terrain height diagnostic
+
+<!-- OPENWC_CLAIM:M00-QAR-TERRAIN-HEIGHT-001:sindo-main-codex:2026-07-13 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-terrain-height`
+- Lease expires UTC: 2026-07-13
+- Integrator: milestone integrator
+
+## Outcome
+
+Measure rendered terrain height and camera clearance at the five build 12340 golden checkpoints without changing renderer behavior.
+
+## Non-goals
+
+- Adding a runtime terrain-query API or collision system.
+- Changing terrain geometry, coordinate mapping, placements, or cameras.
+- Implementing the M01 CoordinateMapper.
+
+## Paths
+
+- Exclusive: `src/tools/probe_render_terrain_height.gd`
+- Shared/hotspots: renderer baseline documentation and runner
+- Generated/ignored: local JSON probe reports
+
+## Contracts and data
+
+- Public API/events: headless diagnostic CLI only
+- Schema/format version: report schema 1
+- Migration/compatibility: none
+- Consumers: M00 fidelity diagnosis
+
+## Dependencies
+
+- Requires: calibrated renderer manifest and active terrain meshes
+- Blocks: classification of under-terrain camera gaps
+- External state: local extracted/cache data
+
+## Verification
+
+- Commands: terrain probe, M00 dry-run, coordination and documentation gates
+- Fixtures: five calibrated manifest checkpoints
+- Fidelity evidence: camera clearance against rendered OpenWC terrain
+- Performance budget: offline diagnostic only
+
+## Documentation deliverables
+
+- Inline public API docs: script CLI header
+- Module specification: verification/source map
+- Data-flow diagram: terrain probe flow
+- Sequence/state/dependency diagrams: synchronous diagnostic; not applicable
+- Source map/status updates: baseline and renderer module
+
+## Simplicity and naming
+
+- Important names introduced: `terrain_height`, `camera_clearance`
+- Simplest considered solution: CPU ray against already loaded mesh
+- Rejected complexity/abstractions: new parser, physics collision, runtime query service
+- Unavoidable complexity and justification: tile-local ray transform is required by mesh ownership
+- Measured optimization evidence: not applicable
+
+## Status
+
+- State: ready
+- Done: active-mesh terrain probe, four clearance measurements, isolated waterfall missing-mesh confirmation and documentation
+- Next: integrator review; placement/composition diagnosis for four points and tile 30_49 ownership diagnosis remain separate packages
+- Blocked by:
+
+## Handoff
+
+- Commit: branch HEAD
+- Results: four cameras are 12.034..90.178 units above terrain; waterfall tile has no accessible terrain mesh after 10-second settle
+- Remaining risks: mesh ray does not measure WMO/M2 occlusion; waterfall missing mesh requires streaming ownership investigation
+- Documentation updated: `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`

coordination/claims/M00-QAR-TILE-OWNERSHIP-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-TILE-OWNERSHIP-001 — Waterfall terrain tile ownership
+
+<!-- OPENWC_CLAIM:M00-QAR-TILE-OWNERSHIP-001:sindo-main-codex:2026-07-13 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-waterfall-tile-ownership`
+- Lease expires UTC: 2026-07-13
+- Integrator: milestone integrator
+
+## Outcome
+
+Identify the runtime transition that prevents waterfall tile `30_49` from exposing a terrain mesh to the height probe.
+
+## Non-goals
+
+- Changing streaming budgets or terrain behavior.
+- Rebuilding caches or modifying extracted assets.
+- Adding a production terrain query service.
+
+## Paths
+
+- Exclusive: terrain probe runtime ownership diagnostics
+- Shared/hotspots: renderer baseline documentation
+- Generated/ignored: local probe reports and caches
+
+## Contracts and data
+
+- Public API/events: additive diagnostic JSON fields
+- Schema/format version: terrain report remains schema 1
+- Migration/compatibility: additive fields only
+- Consumers: M00 fidelity diagnosis
+
+## Dependencies
+
+- Requires: merged terrain-height probe and local cache inventory
+- Blocks: waterfall terrain ownership classification
+- External state: local extracted/cache data
+
+## Verification
+
+- Commands: isolated waterfall probe, coordination and documentation gates
+- Fixtures: checkpoint tile `30_49`
+- Fidelity evidence: runtime state correlated with build 12340 waterfall viewpoint
+- Performance budget: offline diagnostic
+
+## Documentation deliverables
+
+- Inline public API docs: diagnostic output fields
+- Module specification: verification/source map if behavior changes
+- Data-flow diagram: update ownership transition if needed
+- Sequence/state/dependency diagrams: document observed tile transition
+- Source map/status updates: baseline findings
+
+## Simplicity and naming
+
+- Important names introduced: `available`, `queued_index`, `loading`, `state_present`, `mesh_source`
+- Simplest considered solution: inspect existing loader registries read-only
+- Rejected complexity/abstractions: new tracing framework
+- Unavoidable complexity and justification: none
+- Measured optimization evidence: not applicable
+
+## Status
+
+- State: ready
+- Done: raw/cache inventory, isolated runtime state, mesh AABB/local probe and nearby sampling diagnosis
+- Next: integrator review; placement/composition remains the actual paired-camera gap
+- Blocked by:
+
+## Handoff
+
+- Commit: branch HEAD
+- Results: tile 30_49 ownership and meshes are healthy; exact ray misses a triangle seam/edge, while a 2-unit offset samples terrain at 113.872
+- Remaining risks: nearby estimate is diagnostic and must not become a gameplay terrain-query contract
+- Documentation updated: `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`

coordination/claims/M00-QAR-VISUAL-DIFF-001.md

@@ -0,0 +1,78 @@
+# M00-QAR-VISUAL-DIFF-001 — Renderer checkpoint visual diff
+
+<!-- OPENWC_CLAIM:M00-QAR-VISUAL-DIFF-001:sindo-main-codex:2026-07-13 -->
+
+## Ownership
+
+- Target: M00
+- Program: QAR
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m00-checkpoint-diff`
+- Lease expires UTC: 2026-07-13
+- Integrator: milestone integrator
+
+## Outcome
+
+Provide a deterministic, headless perceptual comparison for paired renderer checkpoint PNGs, with machine-readable results and synthetic regression coverage.
+
+## Non-goals
+
+- Supplying or committing original-client screenshots.
+- Claiming visual parity or replacing human approval.
+- Image registration, camera correction, or temporal animation matching.
+
+## Paths
+
+- Exclusive: `src/tools/compare_render_checkpoints.gd`
+- Shared/hotspots: `src/tools/render_baseline_manifest.json`, `tools/run_render_baseline.ps1`, `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`, `RENDER.md`
+- Generated/ignored: comparison reports, diff PNGs, original-client captures
+
+## Contracts and data
+
+- Public API/events: headless CLI arguments and JSON report documented in renderer baseline docs
+- Schema/format version: comparison report schema 1; baseline manifest schema remains 1
+- Migration/compatibility: additive manifest budget fields
+- Consumers: developers and CI
+
+## Dependencies
+
+- Requires: Godot `Image` API and M00 checkpoint naming contract
+- Blocks: automated portion of original-client paired comparison
+- External state: approved build 12340 screenshots remain unavailable
+
+## Verification
+
+- Commands: headless self-test; manifest verification; documentation and coordination gates
+- Fixtures: tool-generated identical and changed 2x2 PNGs
+- Fidelity evidence: algorithm is deterministic; real-client evidence remains a manual/external input
+- Performance budget: offline checkpoint operation, linear in pixel count
+
+## Documentation deliverables
+
+- Inline public API docs: CLI usage in script header
+- Module specification: update renderer verification and source map
+- Data-flow diagram: update baseline documentation
+- Sequence/state/dependency diagrams: not stateful or asynchronous; not applicable
+- Source map/status updates: renderer module and RENDER notes
+
+## Simplicity and naming
+
+- Important names introduced: `mean_perceptual_error`, `changed_pixel_ratio`
+- Simplest considered solution: direct Godot Image iteration with no dependency
+- Rejected complexity/abstractions: external image library, SSIM window pipeline, image registration
+- Unavoidable complexity and justification: sRGB linearization avoids comparing encoded channel values directly
+- Measured optimization evidence: not required for offline seven-checkpoint comparison
+
+## Status
+
+- State: ready
+- Done: comparator, runner integration, manifest tolerance contract, synthetic regression, five local build 12340 references, three viewpoint calibrations, corrected visual capture and first paired report
+- Next: integrator review; coordinate/placement gap should be resolved before tolerance calibration
+- Blocked by: real paired screenshots only for final human fidelity approval
+
+## Handoff
+
+- Commit: branch HEAD
+- Results: ten pairs compared with no missing candidates; mean error 0.0707..0.1746 and changed ratio 0.5504..0.8187; human review identified under-terrain/inside-geometry camera mismatches
+- Remaining risks: coordinate/placement mismatch blocks meaningful tolerance calibration; synthetic animation, dusk and full human approval remain incomplete
+- Documentation updated: `docs/RENDER_BASELINE.md`, `docs/modules/world-renderer.md`, `RENDER.md`

docs/RENDER_BASELINE.md

@@ -24,6 +24,46 @@
 - `<checkpoint>__cold_process.png` — первый визит в текущем процессе;
 - `<checkpoint>__warm_revisit.png` — повторный визит в том же процессе после обхода контрольных точек.
 
+## Парное визуальное сравнение
+
+Одобренные снимки оригинального клиента хранятся вне Git. Если каталог с ними доступен локально, единый запуск может сразу сравнить PNG с одинаковыми именами:
+
+```powershell
+.\tools\run_render_baseline.ps1 `
+  -ReferenceCheckpointDirectory 'D:\private-fixtures\wow-3.3.5a-checkpoints'
+```
+
+Результат записывается в `user://render_baseline/visual_comparison.json`. Другой путь задаётся через `-VisualComparisonReport`. `-DryRun` несовместим с визуальным сравнением, потому что не создаёт PNG. Runner сохраняет обычный performance capture в нормативном `1280×900`, затем отдельно снимает visual candidates в `2560×1440`; разрешение можно переопределить через `-VisualComparisonWidth` и `-VisualComparisonHeight`, не меняя performance baseline.
+
+Отдельный запуск сравнения:
+
+```powershell
+godot --headless --path . `
+  --script res://src/tools/compare_render_checkpoints.gd -- `
+  --reference 'D:\private-fixtures\wow-3.3.5a-checkpoints' `
+  --candidate "$env:APPDATA\Godot\app_userdata\OpenWC\render_baseline" `
+  --output user://render_baseline/visual_comparison.json
+```
+
+Reference-каталог принимает JPG/JPEG/PNG оригинального клиента с именем checkpoint, например `goldshire_dense_m2.jpg`. Диагностические кадры с префиксом `diagnostic_` игнорируются. Один reference автоматически сопоставляется с `<checkpoint>__cold_process.png` и `<checkpoint>__warm_revisit.png` OpenWC.
+
+Сравнение переводит sRGB в linear color space, вычисляет взвешенную ошибку яркости/цвета для каждого пикселя, среднюю ошибку кадра и долю пикселей выше локального порога. Нормативные defaults находятся в `comparison_budgets` manifest: mean error `0.015`, changed-pixel ratio `0.01`, pixel error threshold `0.04`. Любое превышение, несовпадение размеров, отсутствие пары или пустой reference-каталог возвращает ненулевой exit code.
+
+Автоматический pass не является доказательством parity: animation phase, weather, camera alignment и intentional gaps требуют human approval. Для проверки алгоритма без proprietary данных используется:
+
+```powershell
+godot --headless --path . --script res://src/tools/compare_render_checkpoints.gd -- --self-test
+```
+
+```mermaid
+flowchart LR
+    R[Private approved reference PNGs] --> C[Checkpoint comparator]
+    N[New baseline PNGs] --> C
+    M[Manifest tolerance defaults] --> C
+    C --> J[JSON metrics and pass/fail]
+    J --> H[Human fidelity approval]
+```
+
 `cold_process` не означает очищенный Windows filesystem cache. Поле `cache_state` и полный inventory обязаны интерпретироваться вместе с результатом. Удаление или принудительная пересборка cache не входит в baseline-команду. Для отдельного запуска после контролируемой очистки безопасного локального cache следует передать осмысленную метку, например `-CacheState rebuilt-clean`; proprietary source assets команда не изменяет.
 
 ## Контрольные точки и детерминизм
@@ -38,7 +78,7 @@
 - синтетический native-animation probe `GryphonRoost01.m2`;
 - тот же Elwynn overview в 19:00 для sky transition.
 
-Зафиксированы camera/target/player position, viewport, FOV, quality preset и время мира. Для temporal shader/animation кадров SHA-256 служит идентификатором артефакта, но не pass-критерием: будущая автоматическая визуальная проверка должна использовать perceptual diff и согласованный tolerance. Синтетический animation probe существует только внутри capture tool и не меняет runtime streaming scene.
+Зафиксированы camera/target/player position, viewport, FOV, quality preset и время мира. Для temporal shader/animation кадров SHA-256 служит идентификатором артефакта, но не самостоятельным pass-критерием: автоматическая визуальная проверка использует perceptual diff и согласованный tolerance. Синтетический animation probe существует только внутри capture tool и не меняет runtime streaming scene.
 
 ## Метрики и budget
 
@@ -74,3 +114,83 @@ Baseline пока не имеет approved парных кадров ориги
 - возможная смена D3D12 на Vulkan при ошибке descriptor heap — фактический backend всегда берётся из `report.json`.
 
 Парное сравнение с клиентом 3.3.5a должно использовать те же map position, local time и weather. Каждый gap регистрируется как terrain/material, placement, animation, lighting, liquid или culling; baseline сам по себе gap не закрывает.
+
+Локальная сессия build 12340 от 2026-07-11 откалибровала три непригодные исходные позиции: dense-M2 camera была полностью закрыта кронами, large-WMO camera находилась у дымохода кузни, liquid camera попадала под terrain оригинального клиента. Manifest теперь содержит проверенные replacement camera positions. Пять approved локальных reference JPG хранятся вне Git; synthetic animated probe и dusk checkpoint всё ещё требуют отдельной процедуры.
+
+Первый paired run после калибровки создал десять сравнений (пять reference × cold/warm), без missing pairs. Все пары ожидаемо превысили строгий tolerance: mean perceptual error `0.0707..0.1746`, changed-pixel ratio `0.5504..0.8187`. Human inspection показал, что это пока не чистая material/lighting ошибка: при тех же WoW-derived координатах OpenWC terrain-overview camera находится под terrain/placements, WMO camera — внутри таверны, liquid camera — внутри скал; ADT и dense-M2 композиции также существенно смещены. До исправления coordinate/placement mismatch эти значения являются gap evidence, а не основанием расширять tolerance.
+
+Capture tool строит camera basis явно из target и world-up. Это исключает неоднозначный roll `look_at` при автоматической съёмке. `ViewportTexture.get_image()` сохраняется без дополнительного vertical flip для Godot 4.6.1.
+
+## Coordinate calibration
+
+Пять принятых build 12340 viewpoints записаны в manifest как `reference_wow_camera`. Они содержат только числовые world coordinates и не включают proprietary данные. Headless probe:
+
+```powershell
+godot --headless --path . --script res://src/tools/verify_render_coordinate_calibration.gd
+```
+
+```mermaid
+flowchart LR
+    O[Observed build 12340 WoW XYZ] --> W[WoW to Godot formula]
+    W --> G[Manifest Godot camera XYZ]
+    G --> R[Godot to WoW round-trip]
+    R --> E[Maximum numeric error]
+```
+
+На пяти точках maximum mapping/round-trip error равен `0.000015`. Это исключает текущую формулу `gx = center - wy`, `gy = wz`, `gz = center - wx` как источник крупного paired mismatch. Результат не доказывает renderer parity: следующая диагностика должна отдельно проверить terrain height, placement transforms и фактическое camera direction/FOV. Production `CoordinateMapper` остаётся задачей M01; M00 probe не создаёт второй публичный coordinate contract.
+
+## Terrain height diagnostic
+
+Rendered terrain проверяется без нового runtime API: offline probe использует уже загруженный tile mesh, строит `TriangleMesh` и выполняет вертикальный ray в tile-local space.
+
+```powershell
+godot --headless --path . --script res://src/tools/probe_render_terrain_height.gd -- --wait 2
+```
+
+```mermaid
+flowchart LR
+    C[Calibrated camera XZ] --> S[Streaming tile state]
+    S --> M[Active terrain mesh]
+    M --> T[Tile-local TriangleMesh ray]
+    T --> H[Terrain height and camera clearance]
+```
+
+Измеренный clearance: terrain overview `89.044`, ADT boundary `44.788`, dense M2 `90.178`, large WMO `12.034`, waterfall примерно `76.128` Godot units. Следовательно, все пять камер находятся над rendered terrain; visual obstruction принадлежит placements/WMO/composition, а не terrain height.
+
+Waterfall XZ сначала давал `no_intersection`, хотя tile `30_49` был available, полностью загружен, имел `control_splat_cache` quality mesh и LOD0 mesh, а probe находился внутри mesh AABB. Ray со смещением `2.0` units пересёк тот же mesh на высоте `113.872`; точная XZ попала на triangle seam/edge numerical miss. Probe теперь сообщает `sampled_nearby`, distance и source tile вместо ложного streaming ownership gap. `--require-all` остаётся строгим режимом для действительно неснятых точек.
+
+## Camera occluder diagnostic
+
+Scene-tree placement composition проверяется transformed AABB без изменения renderer:
+
+```powershell
+godot --headless --path . --script res://src/tools/probe_render_camera_occluders.gd -- --wait 3
+```
+
+```mermaid
+flowchart LR
+    C[Calibrated camera] --> A[Published Mesh/MultiMesh AABBs]
+    T[Manifest target] --> S[Camera-to-target segment]
+    A --> P[Camera containment test]
+    A --> I[Segment intersection test]
+    S --> I
+    P --> J[JSON occluder report]
+    I --> J
+```
+
+Ни одна из пяти камер не находится внутри опубликованной scene-tree geometry. Terrain-overview segment пересекает четыре Stormwind WMO groups, large-WMO segment — три Goldshire Inn groups, waterfall segment — liquid surface; ADT boundary и dense-M2 segments не пересекают placement AABB. Поэтому прежнее визуальное впечатление «камера внутри WMO/placements» не подтверждается. Основной paired gap сейчас — неточно воспроизведённые manual look direction/target/FOV reference-кадров: например, автоматический Goldshire target направляет луч через фасад внутрь WMO, тогда как reference был вручную скадрирован на весь фасад. Probe охватывает только scene-tree MeshInstance/MultiMesh; RID-only instances не имеют доступного semantic path и явно исключены из coverage.
+
+## Empirical FOV sweep
+
+В build 12340 `GetCVar("cameraFoV")` возвращает `nil`, а `/console cameraFoV` и `ConsoleExec("cameraFoV")` не выдают значения. Поэтому capture tool поддерживает additive `--camera-fov`, а comparator — `--only`, позволяющий ограничить sweep одним reference checkpoint.
+
+```mermaid
+flowchart LR
+    F[Candidate vertical FOV] --> C[Dedicated checkpoint camera]
+    C --> P[Filtered checkpoint PNGs]
+    R[One original-client reference] --> D[Perceptual comparator --only]
+    P --> D
+    D --> M[Ranked metrics]
+```
+
+Первый sweep обнаружил capture defect: разные FOV иногда создавали одинаковые hashes, потому что scene camera могла перехватить viewport после входа в tree. Capture теперь вызывает `camera.make_current()` после добавления world и перед каждым checkpoint. После исправления ADT-boundary ranking стал: `26° → 0.079588`, `38° → 0.079633`, `50° → 0.084353`, `62° → 0.088360`, `86° → 0.097993` mean error. Plateau `26–38°` и несовпавший changed-pixel optimum показывают доминирование manual look direction/framing; эти данные не обосновывают изменение нормативного manifest FOV `62°`. Для настоящей калибровки reference capture должен сохранять воспроизводимые yaw/pitch/zoom или независимый projection fixture.

docs/modules/world-renderer.md

@@ -7,7 +7,7 @@
 | Status | Partial |
 | Target/work package | M00 active; декомпозиция M01–M03 |
 | Owners | Renderer workstream / milestone integrator |
-| Last verified | `93bfe11` + M00 worktree baseline, 2026-07-10 |
+| Last verified | M00 visual-diff worktree, 2026-07-11 |
 | Profiles/capabilities | `Performance`, `Balanced`, `High`, `Custom`; Blizzlike fidelity incomplete |
 
 ## Purpose
@@ -141,6 +141,9 @@ sequenceDiagram
     Stream->>Budget: enqueue finalize operations
     Budget->>Render: attach bounded terrain/M2/WMO/liquid work
     Stream->>Render: evict outside retention range
+    Stream->>Worker: shutdown: wait for WorkerThreadPool tasks
+    Stream->>Stream: shutdown: finish registered ResourceLoader requests
+    Stream->>Render: clear queues, nodes, caches and RIDs
 ```
 
 ## Ownership, threading and resources
@@ -149,7 +152,7 @@ sequenceDiagram
 - Worker tasks не должны менять SceneTree и shared Resource concurrently.
 - Parsed/grouped results передаются обратно через guarded result queues.
 - Mesh/material/node/RID finalization выполняется main thread и ограничивается exported budgets.
-- Shutdown/map switch обязан отменить/дождаться jobs и освободить RIDs; M00 всё ещё фиксирует leaked-resource risk.
+- Shutdown/map switch обязан дождаться WorkerThreadPool jobs и зарегистрированных threaded ResourceLoader requests до очистки очередей, nodes, caches и RIDs.
 - Cache resources считаются immutable после публикации.
 
 ## Errors, cancellation and recovery
@@ -162,7 +165,7 @@ sequenceDiagram
 | Main-thread hitch | Named section timing | Frame spike, work remains queued | `HITCH` log | Lower budget/fix finalize path |
 | D3D12 descriptor exhaustion | Rendering backend error | Render failure/fallback backend | Godot error + baseline report | Dedup resources/fix settings |
 | Teleport/map change | Focus/session transition | Old jobs become stale | Target/session generation | Cancel/drop stale results |
-| Shutdown leak | Godot leak/RID diagnostics | Resource retained | Shutdown report | Ownership cleanup before DONE |
+| Shutdown leak | Godot leak/RID diagnostics | Resource retained | Verbose shutdown report | Drain owned worker and resource requests before clearing registries |
 
 ## Configuration and capabilities
 
@@ -192,9 +195,9 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 
 ## Verification
 
-- Unit/contract tests: material mapping, unique-ID dedupe, placement probes, baseline manifest.
+- Unit/contract tests: material mapping, unique-ID dedupe, placement probes, baseline manifest, five-point coordinate calibration, synthetic perceptual checkpoint diff.
 - Integration/E2E: Eastern Kingdoms/Kalimdor streaming scenes and seven cold/warm checkpoints.
-- Fidelity evidence: current fixed-position captures exist; approved original-client paired screenshots are still missing.
+- Fidelity evidence: пять локальных build 12340 reference JPG откалибровали terrain/ADT/M2/WMO/liquid viewpoints; automated paired-image metrics exist, но synthetic animation/dusk и полный human approval ещё не закрыты.
 - Performance budgets: M00 report records cold/warm p95 and max hitch; no final acceptance threshold yet.
 - Manual diagnostics: [`../RENDER_BASELINE.md`](../RENDER_BASELINE.md) and [`../../RENDER.md`](../../RENDER.md).
 
@@ -222,7 +225,11 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 - Monolithic streamer mixes planning, jobs, caches and presentation.
 - Direct camera path remains until M01/M03.
 - Original-client paired fidelity evidence incomplete.
-- D3D12 descriptor and shutdown RID/resource issues remain.
+- Первый paired run выявил coordinate/placement mismatch: несколько совпадающих server-derived camera positions оказываются под terrain или внутри WMO/rocks OpenWC.
+- Terrain-height probe исключил under-terrain состояние для всех пяти точек; waterfall exact-XZ miss классифицирован как TriangleMesh seam/edge и подтверждён nearby sample в 2 units.
+- Camera-occluder probe не нашёл camera containment в пяти точках; paired mismatch локализован прежде всего в manual look direction/target/FOV calibration, с явным ограничением по RID-only geometry.
+- Empirical FOV sweep выявил, что checkpoint camera должна явно вызывать `make_current()`; после исправления projection ranking остаётся inconclusive из-за неизвестного manual yaw/pitch/framing reference.
+- D3D12 descriptor issues remain; the capture-path anonymous `RefCounted` shutdown leak is regression-covered by a clean verbose dry-run, while other RID/resource diagnostics still require independent evidence.
 - M2/WMO/material/particle/ribbon/portal parity incomplete.
 - Public API is mostly exported configuration rather than stable contracts.
 
@@ -239,6 +246,11 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/native/src/*_loader.cpp` | Native binary parsing |
 | `src/tools/build_*cache.gd`, `src/tools/bake_*cache.gd` | Offline cache generation |
 | `tools/run_render_baseline.ps1` | Unified M00 baseline runner |
+| `src/tools/compare_render_checkpoints.gd` | Offline JPG/PNG paired-image perceptual metrics and JSON pass/fail report |
+| `src/tools/capture_render_checkpoints.gd` | Deterministic no-roll checkpoint camera, performance and visual capture |
+| `src/tools/verify_render_coordinate_calibration.gd` | Build 12340 camera-coordinate golden point round-trip diagnostic |
+| `src/tools/probe_render_terrain_height.gd` | Offline active-mesh terrain height and camera-clearance report |
+| `src/tools/probe_render_camera_occluders.gd` | Scene-tree placement containment and camera-to-target AABB intersection report |
 
 ## Related decisions and references
 

src/scenes/streaming/streaming_world_loader.gd

@@ -2073,7 +2073,7 @@ func _wait_for_tile_tasks() -> void:
 			var path: String = String(pending.get("path", ""))
 			if not path.is_empty():
 				var status := ResourceLoader.load_threaded_get_status(path)
-				if status == ResourceLoader.THREAD_LOAD_LOADED:
+				if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 					ResourceLoader.load_threaded_get(path)
 	_tile_loading_tasks.clear()
 
@@ -2094,7 +2094,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_m2_mesh_load_requests.clear()
 	_m2_mesh_finalize_queue.clear()
@@ -2105,7 +2105,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_m2_animation_load_requests.clear()
 	_m2_animation_finalize_queue.clear()
@@ -2115,7 +2115,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_wmo_scene_load_requests.clear()
 
@@ -2124,7 +2124,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_wmo_render_load_requests.clear()
 	_wmo_render_missing_cache.clear()
@@ -2137,7 +2137,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_terrain_upgrade_tasks.clear()
 
@@ -2148,7 +2148,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_terrain_control_splat_cache_tasks.clear()
 
@@ -2162,7 +2162,7 @@ func _wait_for_tile_tasks() -> void:
 		if path.is_empty():
 			continue
 		var status := ResourceLoader.load_threaded_get_status(path)
-		if status == ResourceLoader.THREAD_LOAD_LOADED:
+		if status == ResourceLoader.THREAD_LOAD_IN_PROGRESS or status == ResourceLoader.THREAD_LOAD_LOADED:
 			ResourceLoader.load_threaded_get(path)
 	_terrain_splat_cache_tasks.clear()
 	_terrain_splat_result_mutex.lock()

src/tools/capture_render_checkpoints.gd

@@ -2,6 +2,7 @@ extends SceneTree
 
 const DEFAULT_MANIFEST_PATH := "res://src/tools/render_baseline_manifest.json"
 const M2_NATIVE_ANIMATED_BUILDER := preload("res://addons/mpq_extractor/loaders/m2_native_animated_builder.gd")
+const SHUTDOWN_DRAIN_FRAMES := 2
 
 
 func _initialize() -> void:
@@ -22,10 +23,13 @@ func _capture_async() -> void:
 	var measure_seconds := float(_arg(args, "--measure", str(manifest.get("default_measure_seconds", 3.0))))
 	var revision := _arg(args, "--revision", "worktree")
 	var cache_state := _arg(args, "--cache-state", "existing")
+	var camera_fov_override := float(_arg(args, "--camera-fov", str(manifest.get("camera_fov", 62.0))))
 	var headless := DisplayServer.get_name().to_lower() == "headless"
 	var dry_run := args.has("--dry-run") or headless
 	var viewport: Array = manifest.get("viewport", [1280, 900])
-	get_root().size = Vector2i(maxi(16, int(viewport[0])), maxi(16, int(viewport[1])))
+	var viewport_width := int(_arg(args, "--viewport-width", str(viewport[0])))
+	var viewport_height := int(_arg(args, "--viewport-height", str(viewport[1])))
+	get_root().size = Vector2i(maxi(16, viewport_width), maxi(16, viewport_height))
 
 	var abs_output_dir := ProjectSettings.globalize_path(output_dir)
 	DirAccess.make_dir_recursive_absolute(abs_output_dir)
@@ -53,7 +57,7 @@ func _capture_async() -> void:
 	var camera := Camera3D.new()
 	camera.name = "CheckpointCamera"
 	camera.current = true
-	camera.fov = float(manifest.get("camera_fov", 62.0))
+	camera.fov = camera_fov_override
 	camera.far = 50000.0
 	camera.position = _vector3(first.get("camera", [0.0, 0.0, 0.0]))
 	(world as Node3D).add_child(camera)
@@ -63,6 +67,7 @@ func _capture_async() -> void:
 	get_root().add_child(world)
 	await process_frame
 	await process_frame
+	camera.make_current()
 
 	var player := world.get_node_or_null("ThirdPersonPlayer") as Node3D
 	if player != null:
@@ -80,6 +85,7 @@ func _capture_async() -> void:
 		"created_utc": Time.get_datetime_string_from_system(true, true),
 		"dry_run": dry_run,
 		"cache_state": cache_state,
+		"camera_fov": camera_fov_override,
 		"environment": _environment_metadata(),
 		"comparison_budgets": manifest.get("comparison_budgets", {}),
 		"cache_contract": manifest.get("cache_contract", {}),
@@ -107,7 +113,8 @@ func _capture_async() -> void:
 				probe.scale = Vector3.ONE * float(checkpoint.get("probe_scale", 1.0))
 
 			camera.global_position = _vector3(checkpoint.get("camera", [0.0, 0.0, 0.0]))
-			camera.look_at(_vector3(checkpoint.get("target", [0.0, 0.0, 0.0])), Vector3.UP)
+			_orient_camera_without_roll(camera, _vector3(checkpoint.get("target", [0.0, 0.0, 0.0])))
+			camera.make_current()
 			if player != null:
 				player.global_position = _vector3(checkpoint.get("player", checkpoint.get("target", [0.0, 0.0, 0.0])))
 			_set_sky_time(world, float(checkpoint.get("time_hours", 13.0)))
@@ -135,7 +142,6 @@ func _capture_async() -> void:
 			await RenderingServer.frame_post_draw
 
 			var image := get_root().get_texture().get_image()
-			image.flip_y()
 			var file_name := "%s__%s.png" % [checkpoint_name, pass_name]
 			var abs_path := abs_output_dir.path_join(file_name)
 			var err := image.save_png(abs_path)
@@ -162,6 +168,10 @@ func _capture_async() -> void:
 	print("RENDER_BASELINE report=%s results=%d" % [report_path, captured])
 
 	world.queue_free()
+	# SceneTree deletion is deferred. Allow the world and its queued children
+	# to run their shutdown paths before engine teardown.
+	for unused_frame in SHUTDOWN_DRAIN_FRAMES:
+		await process_frame
 	if captured <= 0:
 		push_error("No checkpoints selected. --only filter was: %s" % only)
 		quit(1)
@@ -196,6 +206,15 @@ func _measure_frames(seconds: float, world: Node) -> Dictionary:
 	}
 
 
+func _orient_camera_without_roll(camera: Camera3D, target_position: Vector3) -> void:
+	var forward := (target_position - camera.global_position).normalized()
+	var right := forward.cross(Vector3.UP).normalized()
+	if right.is_zero_approx():
+		right = Vector3.RIGHT
+	var corrected_up := right.cross(forward).normalized()
+	camera.global_basis = Basis(right, corrected_up, -forward)
+
+
 func _result_record(checkpoint: Dictionary, pass_name: String, load_time_ms: float, metrics: Dictionary, sha256: String) -> Dictionary:
 	return {
 		"name": checkpoint.get("name", "checkpoint"),

src/tools/compare_render_checkpoints.gd

@@ -0,0 +1,249 @@
+extends SceneTree
+
+## Compares original-client JPG/PNG references with OpenWC checkpoint PNGs.
+## Usage: godot --headless --path . --script res://src/tools/compare_render_checkpoints.gd --
+##   --reference <directory> --candidate <directory> [--output <report.json>]
+##   [--pixel-threshold 0.04] [--mean-threshold 0.015] [--changed-ratio-threshold 0.01]
+## Use --self-test for a synthetic regression check that writes only under user://.
+
+const REPORT_SCHEMA_VERSION := 1
+const DEFAULT_PIXEL_THRESHOLD := 0.04
+const DEFAULT_MEAN_THRESHOLD := 0.015
+const DEFAULT_CHANGED_RATIO_THRESHOLD := 0.01
+
+
+func _initialize() -> void:
+	var arguments := _parse_arguments(OS.get_cmdline_user_args())
+	if arguments.has("error"):
+		push_error("RENDER_CHECKPOINT_DIFF: %s" % arguments.error)
+		quit(2)
+		return
+	if arguments.get("self_test", false):
+		quit(_run_self_test())
+		return
+
+	var reference_directory := String(arguments.get("reference", ""))
+	var candidate_directory := String(arguments.get("candidate", ""))
+	if reference_directory.is_empty() or candidate_directory.is_empty():
+		push_error("RENDER_CHECKPOINT_DIFF: --reference and --candidate are required")
+		quit(2)
+		return
+
+	var report := _compare_directories(reference_directory, candidate_directory, arguments)
+	var output_path := String(arguments.get("output", ""))
+	if not output_path.is_empty() and not _write_report(output_path, report):
+		quit(2)
+		return
+	print("RENDER_CHECKPOINT_DIFF %s compared=%d failed=%d missing=%d" % [
+		"PASS" if report.passed else "FAIL",
+		report.compared_count,
+		report.failed_count,
+		report.missing_count,
+	])
+	quit(0 if report.passed else 1)
+
+
+func _parse_arguments(raw_arguments: PackedStringArray) -> Dictionary:
+	var parsed := {
+		"pixel_threshold": DEFAULT_PIXEL_THRESHOLD,
+		"mean_threshold": DEFAULT_MEAN_THRESHOLD,
+		"changed_ratio_threshold": DEFAULT_CHANGED_RATIO_THRESHOLD,
+	}
+	var index := 0
+	while index < raw_arguments.size():
+		var argument := raw_arguments[index]
+		if argument == "--self-test":
+			parsed.self_test = true
+			index += 1
+			continue
+		if argument not in ["--reference", "--candidate", "--output", "--only", "--pixel-threshold", "--mean-threshold", "--changed-ratio-threshold"]:
+			return {"error": "unknown argument: %s" % argument}
+		if index + 1 >= raw_arguments.size():
+			return {"error": "missing value for %s" % argument}
+		var key := argument.trim_prefix("--").replace("-", "_")
+		var value := raw_arguments[index + 1]
+		if key.ends_with("threshold"):
+			if not value.is_valid_float():
+				return {"error": "%s requires a number" % argument}
+			parsed[key] = float(value)
+		else:
+			parsed[key] = value
+		index += 2
+	return parsed
+
+
+func _compare_directories(reference_directory: String, candidate_directory: String, options: Dictionary) -> Dictionary:
+	reference_directory = ProjectSettings.globalize_path(reference_directory)
+	candidate_directory = ProjectSettings.globalize_path(candidate_directory)
+	var reference_files := _reference_image_file_names(reference_directory)
+	var only_filter := String(options.get("only", "")).to_lower()
+	var results: Array[Dictionary] = []
+	var failed_count := 0
+	var missing_count := 0
+	for file_name in reference_files:
+		if not only_filter.is_empty() and not file_name.get_basename().to_lower().contains(only_filter):
+			continue
+		var reference_path := reference_directory.path_join(file_name)
+		var checkpoint_name := file_name.get_basename()
+		var candidate_file_names := _candidate_file_names(candidate_directory, checkpoint_name)
+		if candidate_file_names.is_empty():
+			results.append({"checkpoint": checkpoint_name, "reference": file_name, "status": "missing_candidate"})
+			missing_count += 1
+			continue
+		for candidate_file_name in candidate_file_names:
+			var candidate_path := candidate_directory.path_join(candidate_file_name)
+			var comparison := _compare_images(reference_path, candidate_path, options)
+			comparison.checkpoint = checkpoint_name
+			comparison.reference = file_name
+			comparison.candidate = candidate_file_name
+			results.append(comparison)
+			if comparison.status != "passed":
+				failed_count += 1
+	var no_reference_images := reference_files.is_empty()
+	return {
+		"schema_version": REPORT_SCHEMA_VERSION,
+		"passed": not no_reference_images and failed_count == 0 and missing_count == 0,
+		"reference_directory": reference_directory,
+		"candidate_directory": candidate_directory,
+		"pixel_threshold": options.pixel_threshold,
+		"mean_threshold": options.mean_threshold,
+		"changed_ratio_threshold": options.changed_ratio_threshold,
+		"compared_count": results.size() - missing_count,
+		"failed_count": failed_count,
+		"missing_count": missing_count,
+		"no_reference_images": no_reference_images,
+		"results": results,
+	}
+
+
+func _compare_images(reference_path: String, candidate_path: String, options: Dictionary) -> Dictionary:
+	var reference_image := Image.load_from_file(reference_path)
+	var candidate_image := Image.load_from_file(candidate_path)
+	if reference_image == null or candidate_image == null or reference_image.is_empty() or candidate_image.is_empty():
+		return {"status": "load_error"}
+	if reference_image.get_size() != candidate_image.get_size():
+		return {
+			"status": "size_mismatch",
+			"reference_size": [reference_image.get_width(), reference_image.get_height()],
+			"candidate_size": [candidate_image.get_width(), candidate_image.get_height()],
+		}
+
+	var error_sum := 0.0
+	var changed_pixel_count := 0
+	var pixel_count := reference_image.get_width() * reference_image.get_height()
+	for y in reference_image.get_height():
+		for x in reference_image.get_width():
+			var perceptual_error := _perceptual_color_error(reference_image.get_pixel(x, y), candidate_image.get_pixel(x, y))
+			error_sum += perceptual_error
+			if perceptual_error > float(options.pixel_threshold):
+				changed_pixel_count += 1
+	var mean_perceptual_error := error_sum / float(pixel_count)
+	var changed_pixel_ratio := float(changed_pixel_count) / float(pixel_count)
+	var passed := mean_perceptual_error <= float(options.mean_threshold) and changed_pixel_ratio <= float(options.changed_ratio_threshold)
+	return {
+		"status": "passed" if passed else "threshold_exceeded",
+		"width": reference_image.get_width(),
+		"height": reference_image.get_height(),
+		"mean_perceptual_error": mean_perceptual_error,
+		"changed_pixel_ratio": changed_pixel_ratio,
+	}
+
+
+func _perceptual_color_error(reference_color: Color, candidate_color: Color) -> float:
+	var reference_linear := reference_color.srgb_to_linear()
+	var candidate_linear := candidate_color.srgb_to_linear()
+	var red_delta := absf(reference_linear.r - candidate_linear.r)
+	var green_delta := absf(reference_linear.g - candidate_linear.g)
+	var blue_delta := absf(reference_linear.b - candidate_linear.b)
+	var alpha_delta := absf(reference_linear.a - candidate_linear.a)
+	return 0.2126 * red_delta + 0.7152 * green_delta + 0.0722 * blue_delta + 0.25 * alpha_delta
+
+
+func _reference_image_file_names(directory_path: String) -> Array[String]:
+	var directory := DirAccess.open(directory_path)
+	if directory == null:
+		return []
+	var file_names: Array[String] = []
+	for file_name in directory.get_files():
+		var lower_name := file_name.to_lower()
+		if not lower_name.begins_with("diagnostic_") and (lower_name.ends_with(".png") or lower_name.ends_with(".jpg") or lower_name.ends_with(".jpeg")):
+			file_names.append(file_name)
+	file_names.sort()
+	return file_names
+
+
+func _candidate_file_names(candidate_directory: String, checkpoint_name: String) -> Array[String]:
+	var candidates: Array[String] = []
+	for pass_name in ["cold_process", "warm_revisit"]:
+		var file_name := "%s__%s.png" % [checkpoint_name, pass_name]
+		if FileAccess.file_exists(candidate_directory.path_join(file_name)):
+			candidates.append(file_name)
+	if candidates.is_empty():
+		var exact_file_name := "%s.png" % checkpoint_name
+		if FileAccess.file_exists(candidate_directory.path_join(exact_file_name)):
+			candidates.append(exact_file_name)
+	return candidates
+
+
+func _write_report(output_path: String, report: Dictionary) -> bool:
+	var absolute_path := ProjectSettings.globalize_path(output_path)
+	var error := DirAccess.make_dir_recursive_absolute(absolute_path.get_base_dir())
+	if error != OK:
+		push_error("RENDER_CHECKPOINT_DIFF: cannot create report directory: %s" % error_string(error))
+		return false
+	var report_file := FileAccess.open(absolute_path, FileAccess.WRITE)
+	if report_file == null:
+		push_error("RENDER_CHECKPOINT_DIFF: cannot write report: %s" % output_path)
+		return false
+	report_file.store_string(JSON.stringify(report, "  "))
+	return true
+
+
+func _run_self_test() -> int:
+	var root := "user://render_checkpoint_diff_self_test"
+	var reference_directory := root.path_join("reference")
+	var identical_directory := root.path_join("identical")
+	var changed_directory := root.path_join("changed")
+	for directory_path in [reference_directory, identical_directory, changed_directory]:
+		DirAccess.make_dir_recursive_absolute(ProjectSettings.globalize_path(directory_path))
+		_clear_directory_files(directory_path)
+	var reference_image := Image.create(2, 2, false, Image.FORMAT_RGBA8)
+	reference_image.fill(Color(0.25, 0.5, 0.75, 1.0))
+	var changed_image := reference_image.duplicate()
+	changed_image.set_pixel(0, 0, Color.WHITE)
+	if reference_image.save_jpg(reference_directory.path_join("synthetic.jpg"), 1.0) != OK:
+		push_error("RENDER_CHECKPOINT_DIFF SELF_TEST: cannot save JPG reference")
+		return 1
+	for pass_name in ["cold_process", "warm_revisit"]:
+		if reference_image.save_png(identical_directory.path_join("synthetic__%s.png" % pass_name)) != OK:
+			return 1
+		if changed_image.save_png(changed_directory.path_join("synthetic__%s.png" % pass_name)) != OK:
+			return 1
+	var options := {
+		"pixel_threshold": DEFAULT_PIXEL_THRESHOLD,
+		"mean_threshold": DEFAULT_MEAN_THRESHOLD,
+		"changed_ratio_threshold": DEFAULT_CHANGED_RATIO_THRESHOLD,
+	}
+	var identical_report := _compare_directories(reference_directory, identical_directory, options)
+	var changed_report := _compare_directories(reference_directory, changed_directory, options)
+	if not identical_report.passed or changed_report.passed:
+		push_error("RENDER_CHECKPOINT_DIFF SELF_TEST: expected identical pass and changed failure")
+		return 1
+	if reference_image.save_jpg(reference_directory.path_join("ignored.jpg"), 1.0) != OK:
+		return 1
+	var filtered_options := options.duplicate()
+	filtered_options["only"] = "synthetic"
+	var filtered_report := _compare_directories(reference_directory, identical_directory, filtered_options)
+	if not filtered_report.passed or filtered_report.compared_count != 2:
+		push_error("RENDER_CHECKPOINT_DIFF SELF_TEST: --only must exclude unrelated references")
+		return 1
+	print("RENDER_CHECKPOINT_DIFF SELF_TEST PASS")
+	return 0
+
+
+func _clear_directory_files(directory_path: String) -> void:
+	var directory := DirAccess.open(directory_path)
+	if directory == null:
+		return
+	for file_name in directory.get_files():
+		directory.remove(file_name)

src/tools/probe_render_camera_occluders.gd

@@ -0,0 +1,166 @@
+extends SceneTree
+
+## Reports published scene-tree geometry around calibrated renderer cameras.
+## Usage: godot --headless --path . --script res://src/tools/probe_render_camera_occluders.gd --
+##   [--wait 3.0] [--output user://render_camera_occluders/report.json]
+
+const MANIFEST_PATH := "res://src/tools/render_baseline_manifest.json"
+const MAX_REPORTED_INTERSECTIONS := 20
+
+
+func _initialize() -> void:
+	_run_async.call_deferred()
+
+
+func _run_async() -> void:
+	var arguments := OS.get_cmdline_user_args()
+	var wait_seconds := float(_argument(arguments, "--wait", "3.0"))
+	var output_path := _argument(arguments, "--output", "user://render_camera_occluders/report.json")
+	var only_filter := _argument(arguments, "--only", "").to_lower()
+	var manifest := _load_json(MANIFEST_PATH)
+	var packed_scene: PackedScene = load(String(manifest.get("scene", "")))
+	if packed_scene == null:
+		push_error("CAMERA_OCCLUDER_PROBE: cannot load streaming scene")
+		quit(1)
+		return
+	var world := packed_scene.instantiate() as Node3D
+	var camera := Camera3D.new()
+	camera.name = "OccluderProbeCamera"
+	camera.current = true
+	world.add_child(camera)
+	world.set("camera_path", NodePath(camera.name))
+	world.set("debug_streaming", false)
+	get_root().add_child(world)
+	await process_frame
+	await process_frame
+
+	var results: Array[Dictionary] = []
+	for checkpoint_variant in manifest.get("checkpoints", []):
+		if not (checkpoint_variant is Dictionary):
+			continue
+		var checkpoint: Dictionary = checkpoint_variant
+		if not checkpoint.has("reference_wow_camera"):
+			continue
+		var checkpoint_name := String(checkpoint.get("name", "checkpoint"))
+		if not only_filter.is_empty() and not checkpoint_name.to_lower().contains(only_filter):
+			continue
+		var camera_position := _vector3(checkpoint.get("camera", []))
+		var target_position := _vector3(checkpoint.get("target", []))
+		camera.global_position = camera_position
+		if world.has_method("_refresh_streaming_targets_at"):
+			world.call("_refresh_streaming_targets_at", camera_position, true)
+		await create_timer(maxf(0.1, wait_seconds)).timeout
+		var geometry_nodes: Array[Node3D] = []
+		_collect_geometry_nodes(world, geometry_nodes)
+		var containing: Array[Dictionary] = []
+		var intersecting: Array[Dictionary] = []
+		for geometry_node in geometry_nodes:
+			var world_aabb := _geometry_world_aabb(geometry_node)
+			if world_aabb.size.is_zero_approx():
+				continue
+			var record := _geometry_record(geometry_node, world_aabb, camera_position)
+			if world_aabb.has_point(camera_position):
+				containing.append(record)
+			var intersection = world_aabb.intersects_segment(camera_position, target_position)
+			if intersection != null:
+				record["intersection_distance"] = camera_position.distance_to(intersection as Vector3)
+				intersecting.append(record)
+		intersecting.sort_custom(func(a: Dictionary, b: Dictionary) -> bool:
+			return float(a.intersection_distance) < float(b.intersection_distance))
+		if intersecting.size() > MAX_REPORTED_INTERSECTIONS:
+			intersecting.resize(MAX_REPORTED_INTERSECTIONS)
+		var result := {
+			"name": checkpoint_name,
+			"geometry_node_count": geometry_nodes.size(),
+			"camera_containing_geometry": containing,
+			"segment_intersecting_geometry": intersecting,
+		}
+		results.append(result)
+		print("CAMERA_OCCLUDERS name=%s geometry=%d containing=%d segment=%d" % [
+			checkpoint_name, geometry_nodes.size(), containing.size(), intersecting.size()])
+
+	var report := {
+		"schema_version": 1,
+		"created_utc": Time.get_datetime_string_from_system(true, true),
+		"wait_seconds": wait_seconds,
+		"coverage": "scene_tree_only; RenderingServer RID-only instances are excluded",
+		"results": results,
+	}
+	if not _write_json(output_path, report):
+		quit(1)
+		return
+	world.queue_free()
+	quit(0 if not results.is_empty() else 1)
+
+
+func _collect_geometry_nodes(node: Node, output: Array[Node3D]) -> void:
+	if node is MeshInstance3D:
+		var mesh_instance := node as MeshInstance3D
+		if mesh_instance.mesh != null and not mesh_instance.name.begins_with("TileLOD"):
+			output.append(mesh_instance)
+	elif node is MultiMeshInstance3D:
+		var multimesh_instance := node as MultiMeshInstance3D
+		if multimesh_instance.multimesh != null:
+			output.append(multimesh_instance)
+	for child in node.get_children():
+		_collect_geometry_nodes(child, output)
+
+
+func _geometry_world_aabb(node: Node3D) -> AABB:
+	if node is MeshInstance3D:
+		return node.global_transform * (node as MeshInstance3D).mesh.get_aabb()
+	if node is MultiMeshInstance3D:
+		return node.global_transform * (node as MultiMeshInstance3D).multimesh.get_aabb()
+	return AABB()
+
+
+func _geometry_record(node: Node3D, world_aabb: AABB, camera_position: Vector3) -> Dictionary:
+	var node_path := String(node.get_path())
+	var category := "geometry"
+	if node_path.contains("/M2s/") or node is MultiMeshInstance3D:
+		category = "m2"
+	elif node_path.contains("/WMOs/"):
+		category = "wmo"
+	return {
+		"category": category,
+		"node_path": node_path,
+		"distance_to_center": camera_position.distance_to(world_aabb.get_center()),
+		"aabb_position": _vector3_array(world_aabb.position),
+		"aabb_size": _vector3_array(world_aabb.size),
+	}
+
+
+func _vector3(value_variant) -> Vector3:
+	if not (value_variant is Array) or value_variant.size() != 3:
+		return Vector3.ZERO
+	return Vector3(float(value_variant[0]), float(value_variant[1]), float(value_variant[2]))
+
+
+func _vector3_array(value: Vector3) -> Array[float]:
+	return [value.x, value.y, value.z]
+
+
+func _argument(arguments: PackedStringArray, name: String, default_value: String) -> String:
+	var index := arguments.find(name)
+	if index >= 0 and index + 1 < arguments.size():
+		return arguments[index + 1]
+	return default_value
+
+
+func _load_json(path: String) -> Dictionary:
+	var file := FileAccess.open(path, FileAccess.READ)
+	if file == null:
+		return {}
+	var parsed = JSON.parse_string(file.get_as_text())
+	return parsed if parsed is Dictionary else {}
+
+
+func _write_json(path: String, value: Dictionary) -> bool:
+	var absolute_path := ProjectSettings.globalize_path(path)
+	if DirAccess.make_dir_recursive_absolute(absolute_path.get_base_dir()) != OK:
+		return false
+	var file := FileAccess.open(absolute_path, FileAccess.WRITE)
+	if file == null:
+		return false
+	file.store_string(JSON.stringify(value, "  "))
+	return true

src/tools/probe_render_terrain_height.gd

@@ -0,0 +1,250 @@
+extends SceneTree
+
+## Measures camera clearance against the active rendered terrain mesh.
+## Usage: godot --path . --script res://src/tools/probe_render_terrain_height.gd --
+##   [--wait 3.0] [--output user://render_terrain_height/report.json]
+
+const MANIFEST_PATH := "res://src/tools/render_baseline_manifest.json"
+const TILE_SIZE := 533.33333
+const RAY_HEIGHT := 5000.0
+
+
+func _initialize() -> void:
+	_run_async.call_deferred()
+
+
+func _run_async() -> void:
+	var arguments := OS.get_cmdline_user_args()
+	var wait_seconds := float(_argument(arguments, "--wait", "3.0"))
+	var output_path := _argument(arguments, "--output", "user://render_terrain_height/report.json")
+	var only_filter := _argument(arguments, "--only", "").to_lower()
+	var require_all := arguments.has("--require-all")
+	var manifest := _load_json(MANIFEST_PATH)
+	if manifest.is_empty():
+		quit(1)
+		return
+	var packed_scene: PackedScene = load(String(manifest.get("scene", "")))
+	if packed_scene == null:
+		push_error("TERRAIN_HEIGHT_PROBE: cannot load streaming scene")
+		quit(1)
+		return
+	var world := packed_scene.instantiate() as Node3D
+	if world == null:
+		push_error("TERRAIN_HEIGHT_PROBE: streaming scene root is not Node3D")
+		quit(1)
+		return
+	var camera := Camera3D.new()
+	camera.current = true
+	world.add_child(camera)
+	world.set("camera_path", NodePath(camera.name))
+	world.set("debug_streaming", false)
+	get_root().add_child(world)
+	await process_frame
+	await process_frame
+
+	var results: Array[Dictionary] = []
+	for checkpoint_variant in manifest.get("checkpoints", []):
+		if not (checkpoint_variant is Dictionary):
+			continue
+		var checkpoint: Dictionary = checkpoint_variant
+		if not checkpoint.has("reference_wow_camera"):
+			continue
+		if not only_filter.is_empty() and not String(checkpoint.get("name", "")).to_lower().contains(only_filter):
+			continue
+		var camera_position := _vector3(checkpoint.get("camera", []))
+		camera.global_position = camera_position
+		if world.has_method("_refresh_streaming_targets_at"):
+			world.call("_refresh_streaming_targets_at", camera_position, true)
+		await create_timer(maxf(0.1, wait_seconds)).timeout
+		var terrain_sample := _sample_terrain(world, camera_position)
+		terrain_sample["name"] = checkpoint.get("name", "checkpoint")
+		terrain_sample["camera_y"] = camera_position.y
+		if terrain_sample.has("terrain_height"):
+			terrain_sample["camera_clearance"] = camera_position.y - float(terrain_sample.terrain_height)
+		results.append(terrain_sample)
+
+	var report := {
+		"schema_version": 1,
+		"created_utc": Time.get_datetime_string_from_system(true, true),
+		"wait_seconds": wait_seconds,
+		"results": results,
+	}
+	if not _write_json(output_path, report):
+		quit(1)
+		return
+	var sampled_count := 0
+	for result in results:
+		if result.has("terrain_height"):
+			sampled_count += 1
+		print("TERRAIN_HEIGHT name=%s status=%s camera_y=%.3f terrain=%s clearance=%s" % [
+			result.get("name", "checkpoint"),
+			result.get("status", "unknown"),
+			float(result.get("camera_y", 0.0)),
+			str(result.get("terrain_height", "n/a")),
+			str(result.get("camera_clearance", "n/a")),
+		])
+	print("TERRAIN_HEIGHT_PROBE sampled=%d total=%d report=%s" % [sampled_count, results.size(), output_path])
+	world.queue_free()
+	var failed := sampled_count == 0 or (require_all and sampled_count != results.size())
+	quit(1 if failed else 0)
+
+
+func _sample_terrain(world: Node3D, world_position: Vector3) -> Dictionary:
+	var tile_coordinate := Vector2i(
+		int(floor(world_position.x / TILE_SIZE)),
+		int(floor(world_position.z / TILE_SIZE)))
+	var tile_states: Dictionary = world.get("_tile_states")
+	var highest_terrain_height := -INF
+	var intersected_tile_key := ""
+	var ready_mesh_count := 0
+	for tile_y in range(tile_coordinate.y - 1, tile_coordinate.y + 2):
+		for tile_x in range(tile_coordinate.x - 1, tile_coordinate.x + 2):
+			var tile_key := "%d_%d" % [tile_x, tile_y]
+			if not tile_states.has(tile_key):
+				continue
+			var state: Dictionary = tile_states[tile_key]
+			var terrain_height_variant = _intersect_terrain_state(state, world_position)
+			if terrain_height_variant == null:
+				continue
+			ready_mesh_count += 1
+			var terrain_height := float(terrain_height_variant)
+			if terrain_height > highest_terrain_height:
+				highest_terrain_height = terrain_height
+				intersected_tile_key = tile_key
+	if not is_finite(highest_terrain_height):
+		var missing_result := {
+			"status": "no_intersection" if ready_mesh_count > 0 else "mesh_not_ready",
+			"tile": "%d_%d" % [tile_coordinate.x, tile_coordinate.y],
+		}
+		missing_result.merge(_tile_runtime_diagnostic(world, String(missing_result.tile), world_position), true)
+		if bool(missing_result.get("quality_mesh_present", false)) or bool(missing_result.get("tile_lod_mesh_present", false)):
+			missing_result["status"] = "no_intersection"
+			missing_result.merge(_nearest_terrain_sample(world, world_position), true)
+			if missing_result.get("nearest_sample_distance", null) != null:
+				missing_result["status"] = "sampled_nearby"
+				missing_result["terrain_height"] = float(missing_result.nearest_sample_height)
+		return missing_result
+	return {
+		"status": "sampled",
+		"tile": intersected_tile_key,
+		"terrain_height": highest_terrain_height,
+	}
+
+
+func _intersect_terrain_state(state: Dictionary, world_position: Vector3):
+	var terrain_mesh: Mesh = state.get("quality_terrain_mesh", null)
+	if terrain_mesh == null:
+		terrain_mesh = state.get("tile_lod_mesh", null)
+	if terrain_mesh == null:
+		return null
+	var triangle_mesh := terrain_mesh.generate_triangle_mesh()
+	if triangle_mesh == null:
+		return null
+	var tile_root := state.get("root", null) as Node3D
+	if tile_root == null:
+		return null
+	var inverse_transform := tile_root.global_transform.affine_inverse()
+	var local_ray_origin := inverse_transform * Vector3(world_position.x, RAY_HEIGHT, world_position.z)
+	var local_ray_direction := inverse_transform.basis * Vector3.DOWN
+	var intersection: Dictionary = triangle_mesh.intersect_ray(local_ray_origin, local_ray_direction)
+	if intersection.is_empty():
+		return null
+	var local_hit: Vector3 = intersection.get("position", Vector3.ZERO)
+	var world_hit := tile_root.global_transform * local_hit
+	return world_hit.y
+
+
+func _tile_runtime_diagnostic(world: Node3D, tile_key: String, world_position: Vector3) -> Dictionary:
+	var available_tiles: Dictionary = world.get("_available_tiles")
+	var loading_tasks: Dictionary = world.get("_tile_loading_tasks")
+	var tile_states: Dictionary = world.get("_tile_states")
+	var load_queue: Array = world.get("_tile_load_queue")
+	var queued_index := -1
+	for index in load_queue.size():
+		var request: Dictionary = load_queue[index]
+		if String(request.get("key", "")) == tile_key:
+			queued_index = index
+			break
+	var diagnostic := {
+		"available": available_tiles.has(tile_key),
+		"queued_index": queued_index,
+		"loading": loading_tasks.has(tile_key),
+		"state_present": tile_states.has(tile_key),
+		"load_queue_size": load_queue.size(),
+	}
+	if tile_states.has(tile_key):
+		var state: Dictionary = tile_states[tile_key]
+		var quality_mesh: Mesh = state.get("quality_terrain_mesh", null)
+		var tile_lod_mesh: Mesh = state.get("tile_lod_mesh", null)
+		diagnostic["quality_mesh_present"] = quality_mesh != null
+		diagnostic["tile_lod_mesh_present"] = tile_lod_mesh != null
+		diagnostic["quality_source"] = String(state.get("quality_terrain_source", ""))
+		diagnostic["tile_lod"] = int(state.get("tile_lod", -1))
+		var tile_root := state.get("root", null) as Node3D
+		if tile_root != null:
+			var local_position := tile_root.global_transform.affine_inverse() * world_position
+			diagnostic["tile_root_position"] = _vector3_array(tile_root.global_position)
+			diagnostic["probe_local_position"] = _vector3_array(local_position)
+		var diagnostic_mesh := quality_mesh if quality_mesh != null else tile_lod_mesh
+		if diagnostic_mesh != null:
+			var mesh_aabb := diagnostic_mesh.get_aabb()
+			diagnostic["mesh_aabb_position"] = _vector3_array(mesh_aabb.position)
+			diagnostic["mesh_aabb_size"] = _vector3_array(mesh_aabb.size)
+	return diagnostic
+
+
+func _nearest_terrain_sample(world: Node3D, world_position: Vector3) -> Dictionary:
+	var tile_states: Dictionary = world.get("_tile_states")
+	for radius in [2.0, 5.0, 10.0, 20.0, 40.0]:
+		for offset in [Vector2(radius, 0.0), Vector2(-radius, 0.0), Vector2(0.0, radius), Vector2(0.0, -radius)]:
+			var sample_position := world_position + Vector3(offset.x, 0.0, offset.y)
+			var sample_tile := Vector2i(
+				int(floor(sample_position.x / TILE_SIZE)),
+				int(floor(sample_position.z / TILE_SIZE)))
+			var sample_key := "%d_%d" % [sample_tile.x, sample_tile.y]
+			if not tile_states.has(sample_key):
+				continue
+			var height_variant = _intersect_terrain_state(tile_states[sample_key], sample_position)
+			if height_variant != null:
+				return {
+					"nearest_sample_distance": radius,
+					"nearest_sample_height": float(height_variant),
+					"nearest_sample_tile": sample_key,
+				}
+	return {"nearest_sample_distance": null}
+
+
+func _vector3_array(value: Vector3) -> Array[float]:
+	return [value.x, value.y, value.z]
+
+
+func _vector3(value_variant) -> Vector3:
+	if not (value_variant is Array) or value_variant.size() != 3:
+		return Vector3.ZERO
+	return Vector3(float(value_variant[0]), float(value_variant[1]), float(value_variant[2]))
+
+
+func _argument(arguments: PackedStringArray, name: String, default_value: String) -> String:
+	var index := arguments.find(name)
+	if index >= 0 and index + 1 < arguments.size():
+		return arguments[index + 1]
+	return default_value
+
+
+func _load_json(path: String) -> Dictionary:
+	var file := FileAccess.open(path, FileAccess.READ)
+	if file == null:
+		return {}
+	var parsed = JSON.parse_string(file.get_as_text())
+	return parsed if parsed is Dictionary else {}
+
+
+func _write_json(path: String, value: Dictionary) -> bool:
+	var absolute_path := ProjectSettings.globalize_path(path)
+	if DirAccess.make_dir_recursive_absolute(absolute_path.get_base_dir()) != OK:
+		return false
+	var file := FileAccess.open(absolute_path, FileAccess.WRITE)
+	if file == null:
+		return false
+	file.store_string(JSON.stringify(value, "  "))
+	return true

src/tools/render_baseline_manifest.json

@@ -5,6 +5,7 @@
   "map": "Azeroth",
   "quality_preset": "High",
   "viewport": [1280, 900],
+  "fidelity_comparison_viewport": [2560, 1440],
   "camera_fov": 62.0,
   "default_wait_seconds": 8.0,
   "default_measure_seconds": 3.0,
@@ -14,7 +15,10 @@
     "max_hitch_ms_max_regression_percent": 10.0,
     "load_time_ms_max_regression_percent": 10.0,
     "memory_bytes_max_regression_percent": 10.0,
-    "visual_diff": "perceptual comparison required; exact PNG hashes are evidence, not an animated-scene pass criterion"
+    "visual_mean_perceptual_error_max": 0.015,
+    "visual_changed_pixel_ratio_max": 0.01,
+    "visual_pixel_error_threshold": 0.04,
+    "visual_diff": "automated thresholds require human approval; exact PNG hashes are evidence, not an animated-scene pass criterion"
   },
   "required_coverage": [
     "terrain",
@@ -39,6 +43,7 @@
       "name": "elwynn_terrain_overview",
       "coverage": ["terrain"],
       "camera": [16680.0, 180.0, 26220.0],
+      "reference_wow_camera": [-9153.334, 386.666, 180.0],
       "target": [16800.0, 62.0, 26400.0],
       "player": [16800.0, 58.0, 26400.0],
       "time_hours": 13.0
@@ -47,6 +52,7 @@
       "name": "elwynn_adt_boundary",
       "coverage": ["adt_boundary"],
       "camera": [17020.0, 105.0, 26590.0],
+      "reference_wow_camera": [-9523.334, 46.666, 105.0],
       "target": [17066.666, 62.0, 26666.666],
       "player": [17060.0, 58.0, 26660.0],
       "time_hours": 13.0
@@ -54,7 +60,8 @@
     {
       "name": "goldshire_dense_m2",
       "coverage": ["dense_m2"],
-      "camera": [16835.0, 135.0, 26435.0],
+      "camera": [16956.666, 150.0, 26466.666],
+      "reference_wow_camera": [-9400.0, 110.0, 150.0],
       "target": [17015.0, 62.0, 26525.0],
       "player": [17015.0, 58.0, 26525.0],
       "time_hours": 13.0
@@ -62,7 +69,8 @@
     {
       "name": "goldshire_inn_large_wmo",
       "coverage": ["large_wmo"],
-      "camera": [16942.0, 82.0, 26503.0],
+      "camera": [17013.666, 72.0, 26451.666],
+      "reference_wow_camera": [-9385.0, 53.0, 72.0],
       "target": [17042.27, 66.0, 26530.91],
       "player": [17042.27, 58.0, 26530.91],
       "time_hours": 13.0
@@ -70,7 +78,8 @@
     {
       "name": "elwynn_waterfall_liquid",
       "coverage": ["liquid"],
-      "camera": [16445.0, 125.0, 26295.0],
+      "camera": [16481.666, 190.0, 26366.666],
+      "reference_wow_camera": [-9300.0, 585.0, 190.0],
       "target": [16518.84, 68.0, 26427.27],
       "player": [16518.84, 55.0, 26427.27],
       "time_hours": 13.0

src/tools/verify_render_baseline_manifest.gd

@@ -20,6 +20,8 @@ func _initialize() -> void:
 	_expect(int(manifest.get("schema_version", 0)) == 1, "manifest schema must be version 1", failures)
 	_expect(String(manifest.get("profile", "")) == "Blizzlike335", "manifest profile must be Blizzlike335", failures)
 	_expect(ResourceLoader.exists(String(manifest.get("scene", ""))), "streaming scene must exist", failures)
+	var fidelity_viewport: Array = manifest.get("fidelity_comparison_viewport", [])
+	_expect(fidelity_viewport.size() == 2 and int(fidelity_viewport[0]) > 0 and int(fidelity_viewport[1]) > 0, "fidelity comparison viewport must contain positive width and height", failures)
 
 	var covered := {}
 	var names := {}
@@ -42,6 +44,11 @@ func _initialize() -> void:
 		var required := String(required_variant)
 		_expect(covered.has(required), "missing checkpoint coverage: %s" % required, failures)
 
+	var comparison_budgets: Dictionary = manifest.get("comparison_budgets", {})
+	for threshold_name in ["visual_mean_perceptual_error_max", "visual_changed_pixel_ratio_max", "visual_pixel_error_threshold"]:
+		var threshold := float(comparison_budgets.get(threshold_name, -1.0))
+		_expect(threshold >= 0.0 and threshold <= 1.0, "%s must be between 0 and 1" % threshold_name, failures)
+
 	var contract: Dictionary = manifest.get("cache_contract", {})
 	var actual_versions := {
 		"baked_terrain": STREAMING_LOADER.REQUIRED_BAKED_TILE_FORMAT_VERSION,

src/tools/verify_render_coordinate_calibration.gd

@@ -0,0 +1,88 @@
+extends SceneTree
+
+## Verifies observed build 12340 camera coordinates against the current renderer
+## WoW X/Y/Z to Godot X/Y/Z convention. This diagnostic does not define the
+## future M01 production CoordinateMapper contract.
+
+const MANIFEST_PATH := "res://src/tools/render_baseline_manifest.json"
+const WOW_WORLD_CENTER := 17066.666
+const MAXIMUM_POSITION_ERROR := 0.002
+
+
+func _initialize() -> void:
+	var manifest := _load_manifest()
+	if manifest.is_empty():
+		quit(1)
+		return
+
+	var failures: Array[String] = []
+	var calibrated_count := 0
+	var maximum_round_trip_error := 0.0
+	for checkpoint_variant in manifest.get("checkpoints", []):
+		if not (checkpoint_variant is Dictionary):
+			continue
+		var checkpoint: Dictionary = checkpoint_variant
+		var reference_wow_camera_variant = checkpoint.get("reference_wow_camera", null)
+		if not (reference_wow_camera_variant is Array):
+			continue
+		var reference_wow_camera: Array = reference_wow_camera_variant
+		var checkpoint_name := String(checkpoint.get("name", "checkpoint"))
+		if reference_wow_camera.size() != 3:
+			failures.append("%s reference_wow_camera must contain three coordinates" % checkpoint_name)
+			continue
+		var expected_godot_camera := _array_to_vector3(checkpoint.get("camera", []))
+		var reference_wow_position := _array_to_vector3(reference_wow_camera)
+		var mapped_godot_position := _wow_to_godot(reference_wow_position)
+		var round_trip_wow_position := _godot_to_wow(mapped_godot_position)
+		var mapping_error := mapped_godot_position.distance_to(expected_godot_camera)
+		var round_trip_error := round_trip_wow_position.distance_to(reference_wow_position)
+		maximum_round_trip_error = maxf(maximum_round_trip_error, maxf(mapping_error, round_trip_error))
+		if mapping_error > MAXIMUM_POSITION_ERROR:
+			failures.append("%s maps %.6f units away from manifest camera" % [checkpoint_name, mapping_error])
+		if round_trip_error > MAXIMUM_POSITION_ERROR:
+			failures.append("%s round-trip error is %.6f" % [checkpoint_name, round_trip_error])
+		calibrated_count += 1
+
+	if calibrated_count < 5:
+		failures.append("expected at least five build 12340 camera calibrations, found %d" % calibrated_count)
+	if not failures.is_empty():
+		for failure in failures:
+			push_error("RENDER_COORDINATE_CALIBRATION: %s" % failure)
+		quit(1)
+		return
+	print("RENDER_COORDINATE_CALIBRATION PASS points=%d maximum_error=%.6f" % [calibrated_count, maximum_round_trip_error])
+	quit(0)
+
+
+func _wow_to_godot(wow_position: Vector3) -> Vector3:
+	return Vector3(
+		WOW_WORLD_CENTER - wow_position.y,
+		wow_position.z,
+		WOW_WORLD_CENTER - wow_position.x
+	)
+
+
+func _godot_to_wow(godot_position: Vector3) -> Vector3:
+	return Vector3(
+		WOW_WORLD_CENTER - godot_position.z,
+		WOW_WORLD_CENTER - godot_position.x,
+		godot_position.y
+	)
+
+
+func _array_to_vector3(value_variant) -> Vector3:
+	if not (value_variant is Array) or value_variant.size() != 3:
+		return Vector3.ZERO
+	return Vector3(float(value_variant[0]), float(value_variant[1]), float(value_variant[2]))
+
+
+func _load_manifest() -> Dictionary:
+	var manifest_file := FileAccess.open(MANIFEST_PATH, FileAccess.READ)
+	if manifest_file == null:
+		push_error("Cannot open renderer baseline manifest: %s" % MANIFEST_PATH)
+		return {}
+	var parsed = JSON.parse_string(manifest_file.get_as_text())
+	if not (parsed is Dictionary):
+		push_error("Renderer baseline manifest is not a JSON object")
+		return {}
+	return parsed

tools/run_render_baseline.ps1

@@ -5,6 +5,10 @@ param(
     [string]$CacheState = "existing",
     [double]$WaitSeconds = 8.0,
     [double]$MeasureSeconds = 3.0,
+    [string]$ReferenceCheckpointDirectory,
+    [string]$VisualComparisonReport = "user://render_baseline/visual_comparison.json",
+    [int]$VisualComparisonWidth = 2560,
+    [int]$VisualComparisonHeight = 1440,
     [switch]$DryRun
 )
 
@@ -42,6 +46,7 @@ try {
     Invoke-GodotStep "render-materials" @("--headless", "--path", ".", "--script", "res://src/tools/verify_render_materials.gd")
     Invoke-GodotStep "m2-unique-dedupe" @("--headless", "--path", ".", "--script", "res://src/tools/verify_m2_unique_dedupe.gd")
     Invoke-GodotStep "baseline-manifest" @("--headless", "--path", ".", "--script", "res://src/tools/verify_render_baseline_manifest.gd")
+    Invoke-GodotStep "coordinate-calibration" @("--headless", "--path", ".", "--script", "res://src/tools/verify_render_coordinate_calibration.gd")
 
     $captureArgs = @(
         "--path", ".",
@@ -57,6 +62,33 @@ try {
         $captureArgs = @("--headless") + $captureArgs + @("--dry-run")
     }
     Invoke-GodotStep "capture" $captureArgs
+    if ($ReferenceCheckpointDirectory) {
+        if ($DryRun) {
+            throw "Reference checkpoint comparison requires PNG capture; remove -DryRun"
+        }
+		$visualCandidateOutput = "$Output/visual_comparison_candidates"
+		$visualCaptureArgs = @(
+			"--path", ".",
+			"--script", "res://src/tools/capture_render_checkpoints.gd",
+			"--",
+			"--output", $visualCandidateOutput,
+			"--cache-state", $CacheState,
+			"--revision", $revision,
+			"--wait", $WaitSeconds.ToString([Globalization.CultureInfo]::InvariantCulture),
+			"--measure", $MeasureSeconds.ToString([Globalization.CultureInfo]::InvariantCulture),
+			"--viewport-width", $VisualComparisonWidth.ToString(),
+			"--viewport-height", $VisualComparisonHeight.ToString()
+		)
+		Invoke-GodotStep "visual-capture" $visualCaptureArgs
+        Invoke-GodotStep "visual-comparison" @(
+            "--headless", "--path", ".",
+            "--script", "res://src/tools/compare_render_checkpoints.gd",
+            "--",
+            "--reference", $ReferenceCheckpointDirectory,
+            "--candidate", $visualCandidateOutput,
+            "--output", $VisualComparisonReport
+        )
+    }
     Write-Host "Renderer baseline completed. Report: $Output/report.json"
 } finally {
     Pop-Location