test(M00): diagnose waterfall tile ownership

Work-Package: M00-QAR-TILE-OWNERSHIP-001
Agent: sindo-main-codex
Tests: strict five-point terrain probe, coordination and documentation gates
Fidelity: tile 30_49 ownership is healthy; exact ray miss classified as triangle seam

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`

docs/RENDER_BASELINE.md

@@ -138,3 +138,23 @@ flowchart LR
 ```
 
 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.

docs/modules/world-renderer.md

@@ -223,6 +223,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 - Direct camera path remains until M01/M03.
 - Original-client paired fidelity evidence incomplete.
 - 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.
 - D3D12 descriptor and shutdown RID/resource issues remain.
 - M2/WMO/material/particle/ribbon/portal parity incomplete.
 - Public API is mostly exported configuration rather than stable contracts.
@@ -243,6 +244,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `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 |
 
 ## Related decisions and references
 

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