feat: carve Jajce river into terrain

docs/BUILD_IN_PUBLIC_PLAN.md

@@ -774,17 +774,23 @@ Completed:
     stable-ID resource anchors in a resource-specific horizontal grid. Exact
     expanding queries preserve current scoring and selected targets while the
     reviewed 1,800-source case inspects about 4.4 candidates instead of 1,800.
+36. `Jajce River 03`: the deterministic Terrain3D source now carves a raised
+    waterfall shelf, upper stream, plunge basin, and curved downstream channel.
+    Shared watercourse profiles keep generated terrain and both water ribbons
+    aligned; softened foam/mist and a smaller rock frame make the falls part of
+    the landform. A matched Metal capture records the change, and the rebaked
+    navigation mesh passes terrain-height and runtime route checks.
 
 Next:
 
-1. Sculpt a real Terrain3D river channel and waterfall shelf before adding a
+1. Prove one bounded foliage/resource authoring workflow at a riverbank or
-   broad foliage asset pass. Use Terrain3D particles for nearby grass and
+   forest edge. Use decorative Terrain3D/intentional instances for tree, fern,
-   intentional instancing for tree/fern/rock masses, then rebake and validate
+   flower, and rock masses, but create simulation-owned finite resources only
-   the required village/resource routes.
+   through selected stable-ID `ResourceNode` anchors.
-2. During that first larger foliage pass, prove a bounded authoring workflow
+2. Validate that villagers discover both nearby and farther authored anchors,
-   that places intentional stable-ID `ResourceNode` anchors beside decorative
+   preserve reachable interaction points, and keep the visual batch inside a
-   Terrain3D instances. Add livestock only with a real identity and interaction
+   measured presentation budget. Add livestock only with a real identity and
-   contract.
+   interaction contract.
 
 Do not start with GIS data, a full city, a large asset pack, or more NPC
 mechanics. The next proof is a beautiful stage for the systems that already

docs/LEARNING_ROADMAP.md

@@ -889,15 +889,29 @@ Unload/rebind state authority, stable tie order, moved anchors, reservations,
 player parity, and a deliberately far high-priority winner remain covered. See
 [Loaded Resource Discovery 01](benchmarks/LOADED_RESOURCE_DISCOVERY_01.md).
 
-The immediate next slice should pair this systems foundation with the authored
+The authored-watercourse slice is complete. `JajceWatercourse` now gives the
-world: sculpt the real Terrain3D river channel and waterfall shelf, rebake and
+deterministic terrain generator and both water ribbons one shared profile; the
-validate navigation, then use the first larger foliage/resource pass to prove a
+generated Terrain3D data contains an upper stream, raised waterfall shelf,
-bounded stable-ID anchor placement workflow alongside decorative Terrain3D
+plunge basin, and curved downstream channel. A matched Metal capture records
-instancing. Do not generalize the resource grid to people/buildings/events or
+the result, and the Terrain3D-derived navigation mesh was rebaked and validated
+against required village/resource routes.
+
+The immediate next slice should prove one bounded foliage/resource authoring
+workflow in the real world: build a restrained riverbank or forest-edge cluster
+with decorative Terrain3D/intentional instances, pair only selected harvestable
+trees or berry patches with stable-ID `ResourceNode` anchors, and verify nearby
+and farther loaded anchors remain discoverable through `ActiveWorldAdapter`.
+Keep decorative instances out of simulation state, measure the bounded visual
+cost, and do not generalize the resource grid to people/buildings/events or
 introduce active/abstract LOD before those consumers need it.
 
 Recently completed:
 
+- `Jajce River 03`: deterministic Terrain3D generation now carves the upper
+  stream, raised waterfall shelf, plunge basin, and curved downstream channel;
+  shared watercourse geometry keeps both water ribbons aligned, soft masked
+  mist replaces hard billboards, and the rebaked navigation mesh passes
+  terrain-height and runtime resource-route checks.
 - Loaded-resource spatial discovery: a resource-specific active-world grid
   preserves exact score winners and lifecycle authority while reducing the
   reviewed 1,800-anchor query from 6.45 ms to 46.94 µs.

docs/PROJECT_CONTEXT.md

@@ -341,8 +341,9 @@ but retain far sources whenever their authoritative metadata can still win.
 
 - a centered 512 m Terrain3D landscape split across four regions;
 - deterministic shaped terrain data and six game-owned surface layers;
-- a larger summit citadel, eight cascading houses, mill, full-span bridge,
+- a larger summit citadel, eight cascading houses, mill, full-span bridge, and
-  rock-framed waterfall, mist, smoke, and a Terrain3D-sampled river ribbon;
+  a deterministic Terrain3D watercourse with an upper stream, raised waterfall
+  shelf, rock-framed drop, plunge basin, mist, and curved downstream ribbon;
 - authored dirt path strips that make the current village task loop readable;
 - compact silhouette props for the ridge landmark, guard, study, and rest
   sites, plus a physical pantry whose empty/low/stocked arrangement follows
@@ -979,10 +980,12 @@ Raw samples and workload exclusions live in
 [Simulation scaling baseline 02](benchmarks/SIMULATION_SCALING_BASELINE_02.md)
 and [Loaded Resource Discovery 01](benchmarks/LOADED_RESOURCE_DISCOVERY_01.md).
 
-The next slice should return to the authored Jajce stage: sculpt the real
+The authored Jajce watercourse and its Terrain3D-derived navigation rebake are
-Terrain3D river channel and waterfall shelf, rebake/validate navigation, and
+complete. The next slice should prove a bounded stable-ID resource-anchor
-use the following foliage expansion to prove a bounded stable-ID resource
+placement workflow beside decorative Terrain3D/intentional foliage instances
-anchor placement workflow beside decorative Terrain3D instances. Do not yet
+at one riverbank or forest edge. It should validate nearby and farther loaded
+resource discovery, reachable interaction points, and a measured presentation
+budget without making decorative instances authoritative. Do not yet
 generalize the resource grid or introduce active/abstract simulation LOD.
 
 The remaining simulation-garden target still aims for:

docs/baselines/JAJCE_RIVER_03.md

@@ -0,0 +1,80 @@
+# Jajce River 03
+
+Captured: 2026-07-17
+
+## Files
+
+- [before overview](jajce_river_03_before.png)
+- [after overview](jajce_river_03_after.png)
+- `tools/capture_jajce_lookdev.gd`
+- `tools/generate_jajce_terrain.gd`
+- `tools/bake_jajce_navigation.gd`
+
+The images use the same 1280×720 camera, fixed daylight value, warmup, and
+Metal renderer. They are a matched checkpoint rather than two independently
+composed beauty shots.
+
+## What changed
+
+The previous river was a turquoise presentation ribbon laid across a mostly
+flat valley. Its waterfall was held by a large freestanding rock frame, so the
+water feature read more like a prop than part of the landscape.
+
+The deterministic Terrain3D source now creates:
+
+- a raised shelf upstream of the falls;
+- a shallow upper stream widening toward the lip;
+- an approximately 12 m drop into a shaped plunge basin;
+- a curved downstream channel with visible banks; and
+- slope-driven rock texture around the drop and steeper channel edges.
+
+The waterfall frame is smaller and nested into that landform. Its foam is more
+restrained, and the mist uses a soft radial mask so individual particle quads
+do not appear against the dark cliff. The result remains deliberately reduced:
+citadel, roofs, shelf, falls, bridge, and river form one readable village-center
+composition without attempting a literal reconstruction of Jajce.
+
+## Deterministic authoring contract
+
+`JajceWatercourse` owns the shared center lines, widths, bed heights, shelf
+height, and water offset. `generate_jajce_terrain.gd` uses that profile to
+produce the checked-in Terrain3D regions; `TerrainRiverRibbon.gd` uses the same
+profile and samples the generated terrain for both water meshes. Changing the
+watercourse therefore has one explicit regeneration and navigation-rebake
+path instead of unrelated hand-tuned terrain and presentation coordinates.
+
+This is presentation and interaction geometry only. No resource IDs,
+simulation records, RNG streams, save data, or NPC decision rules changed.
+
+## Validation
+
+The focused watercourse scenario records an upper-stream height of 11.28 m, a
+12.43 m shelf bank, and a -0.65 m plunge basin. It also checks multiple points
+along the downstream bed and verifies both generated water ribbons remain
+within 3 cm of the Terrain3D surface plus the shared water offset.
+
+The navigation bake now contains 403 vertices and 620 polygons. The Jajce
+scaffold verifies required paths reach their destinations and track the new
+terrain heights, while the runtime integration scenario still completes real
+player resource gathering with all 18 finite resource anchors loaded.
+
+## Next visual/system proof
+
+The next pass should author one bounded riverbank or forest-edge foliage mass,
+using decorative Terrain3D/intentional instances for visual density and only a
+small selected set of stable-ID `ResourceNode` anchors for finite harvestable
+resources. Bank stones, ferns, flowers, and tree masses can improve the channel
+edge during that proof. Bridge, buildings, and fortress geometry remain
+prototype blockouts and should be replaced gradually rather than through a
+broad asset dump.
+
+## Capture command
+
+```bash
+HOME="$PWD/logs/quality/godot_profile" \
+APPDATA="$PWD/logs/quality/godot_profile" \
+LOCALAPPDATA="$PWD/logs/quality/godot_profile" \
+/Applications/Godot.app/Contents/MacOS/Godot \
+  --path "$PWD" --script res://tools/capture_jajce_lookdev.gd -- \
+  --output=res://docs/baselines/jajce_river_03_after.png
+```

docs/baselines/jajce_river_03_after.png.import

@@ -0,0 +1,40 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://r87qvthnulve"
+path="res://.godot/imported/jajce_river_03_after.png-43f5610f2e4f42d23b2a77674f846c7e.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://docs/baselines/jajce_river_03_after.png"
+dest_files=["res://.godot/imported/jajce_river_03_after.png-43f5610f2e4f42d23b2a77674f846c7e.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

docs/baselines/jajce_river_03_before.png.import

@@ -0,0 +1,40 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://2whbruuqbywc"
+path="res://.godot/imported/jajce_river_03_before.png-1cca7b1c7659c390906ee3738cc8b95f.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://docs/baselines/jajce_river_03_before.png"
+dest_files=["res://.godot/imported/jajce_river_03_before.png-1cca7b1c7659c390906ee3738cc8b95f.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

tests/jajce_watercourse_terrain_test.gd

@@ -0,0 +1,117 @@
+extends SceneTree
+
+const JajceWatercourse := preload("res://world/jajce/JajceWatercourse.gd")
+
+var failures: Array[String] = []
+
+
+func _initialize() -> void:
+	call_deferred("_run")
+
+
+func _run() -> void:
+	var camera := Camera3D.new()
+	camera.current = true
+	root.add_child(camera)
+	var world: Node3D = load("res://world/jajce/JajceWorld.tscn").instantiate()
+	root.add_child(world)
+	await process_frame
+	for _frame in 4:
+		await physics_frame
+
+	var terrain := world.get_node("TerrainRoot/Terrain3D") as Terrain3D
+	_check(terrain != null, "Jajce watercourse validation requires Terrain3D")
+	if terrain == null:
+		_finish()
+		return
+
+	var shelf_z := -36.0
+	var shelf_center_x := JajceWatercourse.upper_stream_center_x(shelf_z)
+	var shelf_half_width := JajceWatercourse.upper_stream_half_width(shelf_z)
+	var shelf_stream_height := _terrain_height(terrain, shelf_center_x, shelf_z)
+	var shelf_bank_height := _terrain_height(
+		terrain, shelf_center_x + shelf_half_width + 4.0, shelf_z
+	)
+	var plunge_height := _terrain_height(
+		terrain, JajceWatercourse.PLUNGE_POOL_CENTER.x, JajceWatercourse.PLUNGE_POOL_CENTER.y
+	)
+	_check(shelf_stream_height >= 10.8, "Upper stream should remain on the raised waterfall shelf")
+	_check(
+		shelf_bank_height - shelf_stream_height >= 0.45,
+		"Upper stream should be visibly carved below its shelf bank"
+	)
+	_check(
+		shelf_stream_height - plunge_height >= 10.0,
+		"Waterfall shelf should create a readable drop into the plunge basin"
+	)
+
+	var downstream_samples := PackedFloat32Array([-10.0, 12.0, 34.0])
+	for world_z in downstream_samples:
+		var center_x := JajceWatercourse.downstream_center_x(world_z)
+		var half_width := JajceWatercourse.downstream_half_width(world_z)
+		var channel_height := _terrain_height(terrain, center_x, world_z)
+		var left_bank_height := _terrain_height(terrain, center_x - half_width - 5.0, world_z)
+		var right_bank_height := _terrain_height(terrain, center_x + half_width + 5.0, world_z)
+		_check(
+			channel_height <= JajceWatercourse.downstream_bed_height(world_z) + 0.08,
+			"Downstream bed should follow its authored profile at z=%.1f" % world_z
+		)
+		_check(
+			maxf(left_bank_height, right_bank_height) - channel_height >= 0.45,
+			"Downstream channel should read below a natural bank at z=%.1f" % world_z
+		)
+
+	var river_surface := world.get_node("WaterRoot/RiverSurface") as Node3D
+	_check_ribbon_tracks_terrain(
+		terrain, river_surface.get_node("RiverRibbon") as MeshInstance3D, "Downstream water"
+	)
+	_check_ribbon_tracks_terrain(
+		terrain, river_surface.get_node("UpperRiverRibbon") as MeshInstance3D, "Upper-stream water"
+	)
+
+	print(
+		(
+			"[TEST] Jajce watercourse samples | shelf=%.2f bank=%.2f pool=%.2f"
+			% [shelf_stream_height, shelf_bank_height, plunge_height]
+		)
+	)
+	_finish()
+
+
+func _terrain_height(terrain: Terrain3D, world_x: float, world_z: float) -> float:
+	return terrain.data.get_height(Vector3(world_x, 0.0, world_z))
+
+
+func _check_ribbon_tracks_terrain(
+	terrain: Terrain3D, ribbon: MeshInstance3D, label: String
+) -> void:
+	_check(ribbon != null and ribbon.mesh is ArrayMesh, "%s ribbon should be generated" % label)
+	if ribbon == null or not ribbon.mesh is ArrayMesh:
+		return
+	var arrays := ribbon.mesh.surface_get_arrays(0)
+	var vertices: PackedVector3Array = arrays[Mesh.ARRAY_VERTEX]
+	_check(not vertices.is_empty(), "%s ribbon should contain vertices" % label)
+	for vertex_index in range(0, vertices.size(), maxi(1, vertices.size() / 12)):
+		var world_vertex := ribbon.to_global(vertices[vertex_index])
+		var terrain_height := terrain.data.get_height(world_vertex)
+		if is_nan(terrain_height):
+			failures.append("%s ribbon sampled outside Terrain3D" % label)
+			return
+		if absf(world_vertex.y - terrain_height - JajceWatercourse.WATER_SURFACE_OFFSET) > 0.03:
+			failures.append("%s ribbon should hug the carved terrain" % label)
+			return
+
+
+func _check(condition: bool, message: String) -> void:
+	if not condition:
+		failures.append(message)
+
+
+func _finish() -> void:
+	if failures.is_empty():
+		print("[TEST] Jajce watercourse terrain passed")
+		quit(0)
+		return
+	for failure in failures:
+		push_error("[TEST] " + failure)
+	quit(1)

tests/jajce_watercourse_terrain_test.gd.uid

@@ -0,0 +1 @@
+uid://bs5xfsxii5j8w

tests/jajce_world_scaffold_test.gd

@@ -1,5 +1,7 @@
 extends SceneTree
 
+const JajceWatercourse := preload("res://world/jajce/JajceWatercourse.gd")
+
 var failures: Array[String] = []
 
 
@@ -213,7 +215,7 @@ func _run() -> void:
 		"Waterfall mist particles should have visible billboard geometry"
 	)
 	_check(
-		waterfall_mist.position.distance_to(Vector3(25.0, 2.05, -24.0)) < 0.01,
+		waterfall_mist.position.distance_to(Vector3(25.0, 0.65, -21.5)) < 0.01,
 		"Waterfall mist should stay at the waterfall base instead of obscuring the village"
 	)
 	_check(world.has_node("WaterRoot/RiverSurface"), "WaterRoot should include a river surface")
@@ -222,10 +224,34 @@ func _run() -> void:
 		river_ribbon.mesh is ArrayMesh,
 		"River should build a lightweight ribbon from the current Terrain3D surface"
 	)
+	var upper_river_ribbon := (
+		world.get_node("WaterRoot/RiverSurface/UpperRiverRibbon") as MeshInstance3D
+	)
+	_check(
+		upper_river_ribbon.mesh is ArrayMesh,
+		"Waterfall shelf should expose a terrain-following upper stream"
+	)
 	_check(
 		world.has_node("WaterRoot/RiverSurface/PlungePool"),
 		"River should widen into a readable plunge pool beneath the waterfall"
 	)
+	var plunge_pool := world.get_node("WaterRoot/RiverSurface/PlungePool") as MeshInstance3D
+	var expected_pool_height: float = terrain.data.get_height(
+		Vector3(JajceWatercourse.PLUNGE_POOL_CENTER.x, 0.0, JajceWatercourse.PLUNGE_POOL_CENTER.y)
+	)
+	_check(
+		(
+			absf(
+				(
+					plunge_pool.global_position.y
+					- expected_pool_height
+					- JajceWatercourse.WATER_SURFACE_OFFSET
+				)
+			)
+			< 0.03
+		),
+		"Plunge-pool water should follow the carved basin height"
+	)
 	var environment: Environment = (
 		(world.get_node("WorldEnvironment") as WorldEnvironment).environment
 	)

tools/generate_jajce_terrain.gd

@@ -5,6 +5,7 @@ const HALF_SIZE := MAP_SIZE / 2
 const HEIGHT_SCALE := 40.0
 const DATA_DIRECTORY := "res://terrain/jajce/data"
 const TEXTURE_DIRECTORY := "res://terrain/jajce/textures"
+const Watercourse := preload("res://world/jajce/JajceWatercourse.gd")
 
 
 func _initialize() -> void:
@@ -41,13 +42,15 @@ func _generate() -> void:
 			var southern_hill := (
 				11.0 * _elliptical_peak(world_x, world_z, -35.0, -125.0, 130.0, 85.0)
 			)
-			var river_trench := -5.0 * exp(-pow((world_x - 25.0) / 18.0, 2.0))
 			var broad_slope := maxf(0.0, (-world_x - 30.0) * 0.035)
 			var detail := noise.get_noise_2d(world_x, world_z) * 2.4
 			var height := (
-				(ridge + eastern_hill + southern_hill + river_trench + broad_slope + detail)
+				(ridge + eastern_hill + southern_hill + broad_slope + detail) * outside_play_area
-				* outside_play_area
 			)
+			height = _shape_waterfall_shelf(height, world_x, world_z, detail)
+			height = _shape_upper_stream(height, world_x, world_z)
+			height = _shape_plunge_pool(height, world_x, world_z)
+			height = _shape_downstream_channel(height, world_x, world_z)
 			height_map.set_pixel(image_x, image_z, Color(height / HEIGHT_SCALE, 0.0, 0.0, 1.0))
 
 	terrain.data.import_images(
@@ -64,6 +67,44 @@ func _elliptical_peak(
 	return exp(-(pow((x - center_x) / width, 2.0) + pow((z - center_z) / depth, 2.0)))
 
 
+func _shape_waterfall_shelf(height: float, x: float, z: float, detail: float) -> float:
+	var horizontal_mask := 1.0 - smoothstep(10.0, 28.0, absf(x - Watercourse.WATERFALL_CENTER.x))
+	var upstream_mask := smoothstep(-76.0, -54.0, z)
+	var drop_mask := 1.0 - smoothstep(-25.0, -21.0, z)
+	var shelf_mask := horizontal_mask * upstream_mask * drop_mask
+	var shelf_height := Watercourse.SHELF_TOP_HEIGHT + detail * 0.08
+	return lerpf(height, maxf(height, shelf_height), shelf_mask)
+
+
+func _shape_upper_stream(height: float, x: float, z: float) -> float:
+	if z < Watercourse.UPPER_STREAM_START_Z or z > Watercourse.UPPER_STREAM_END_Z:
+		return height
+	var center_x := Watercourse.upper_stream_center_x(z)
+	var half_width := Watercourse.upper_stream_half_width(z)
+	var channel_mask := 1.0 - smoothstep(half_width, half_width + 3.2, absf(x - center_x))
+	var target_height := minf(height, Watercourse.upper_stream_bed_height(z))
+	return lerpf(height, target_height, channel_mask)
+
+
+func _shape_plunge_pool(height: float, x: float, z: float) -> float:
+	var offset := Vector2(x, z) - Watercourse.PLUNGE_POOL_CENTER
+	var elliptical_distance := Vector2(offset.x / 10.5, offset.y / 7.8).length()
+	var basin_mask := 1.0 - smoothstep(0.68, 1.15, elliptical_distance)
+	var cliff_front_mask := smoothstep(-25.0, -20.5, z)
+	var target_height := minf(height, Watercourse.PLUNGE_POOL_BED_HEIGHT)
+	return lerpf(height, target_height, basin_mask * cliff_front_mask)
+
+
+func _shape_downstream_channel(height: float, x: float, z: float) -> float:
+	if z < Watercourse.DOWNSTREAM_START_Z or z > Watercourse.DOWNSTREAM_END_Z:
+		return height
+	var center_x := Watercourse.downstream_center_x(z)
+	var half_width := Watercourse.downstream_half_width(z)
+	var bank_mask := 1.0 - smoothstep(half_width, half_width + 4.5, absf(x - center_x))
+	var target_height := minf(height, Watercourse.downstream_bed_height(z))
+	return lerpf(height, target_height, bank_mask)
+
+
 func _generate_texture(
 	file_name: String, dark_color: Color, light_color: Color, seed_value: int
 ) -> void:

world/jajce/JajceWatercourse.gd

@@ -0,0 +1,49 @@
+class_name JajceWatercourse
+extends RefCounted
+
+const WATERFALL_CENTER := Vector2(25.0, -24.0)
+const SHELF_TOP_HEIGHT := 12.4
+const UPPER_STREAM_START_Z := -58.0
+const UPPER_STREAM_END_Z := -25.0
+const PLUNGE_POOL_CENTER := Vector2(25.0, -19.5)
+const PLUNGE_POOL_BED_HEIGHT := -0.65
+const DOWNSTREAM_START_Z := -20.0
+const DOWNSTREAM_END_Z := 42.0
+const WATER_SURFACE_OFFSET := 0.32
+
+
+static func downstream_progress(world_z: float) -> float:
+	return clampf(inverse_lerp(DOWNSTREAM_START_Z, DOWNSTREAM_END_Z, world_z), 0.0, 1.0)
+
+
+static func downstream_center_x(world_z: float) -> float:
+	var progress := downstream_progress(world_z)
+	var downstream_curve := smoothstep(0.58, 1.0, progress) * 12.0
+	return WATERFALL_CENTER.x + sin(progress * TAU) * 1.4 + downstream_curve
+
+
+static func downstream_half_width(world_z: float) -> float:
+	var progress := downstream_progress(world_z)
+	var base_width := lerpf(4.8, 3.8, smoothstep(0.0, 0.62, progress))
+	return base_width + smoothstep(0.78, 1.0, progress) * 0.8
+
+
+static func downstream_bed_height(world_z: float) -> float:
+	return lerpf(-0.55, -1.3, downstream_progress(world_z))
+
+
+static func upper_stream_progress(world_z: float) -> float:
+	return clampf(inverse_lerp(UPPER_STREAM_START_Z, UPPER_STREAM_END_Z, world_z), 0.0, 1.0)
+
+
+static func upper_stream_center_x(world_z: float) -> float:
+	var progress := upper_stream_progress(world_z)
+	return WATERFALL_CENTER.x + sin(progress * PI * 1.6) * 0.9
+
+
+static func upper_stream_half_width(world_z: float) -> float:
+	return lerpf(2.8, 4.4, smoothstep(0.55, 1.0, upper_stream_progress(world_z)))
+
+
+static func upper_stream_bed_height(world_z: float) -> float:
+	return lerpf(11.55, 11.15, upper_stream_progress(world_z))

world/jajce/JajceWatercourse.gd.uid

@@ -0,0 +1 @@
+uid://dl3523bi00bto

world/jajce/TerrainRiverRibbon.gd

@@ -1,15 +1,16 @@
 extends Node3D
 
+const Watercourse := preload("res://world/jajce/JajceWatercourse.gd")
+
 @export var terrain_path := NodePath("../../TerrainRoot/Terrain3D")
 @export var river_material: Material
-@export_range(6.0, 20.0, 0.5) var river_width := 8.0
 @export_range(2, 12, 1) var width_segments := 6
 @export_range(8, 96, 1) var length_segments := 36
-@export var local_start_z := -25.0
+@export_range(8, 64, 1) var upper_length_segments := 18
-@export var local_end_z := 40.0
+@export_range(0.05, 0.5, 0.01) var water_offset := Watercourse.WATER_SURFACE_OFFSET
-@export_range(0.05, 0.5, 0.01) var water_offset := 0.18
 
 @onready var river_ribbon: MeshInstance3D = $RiverRibbon
+@onready var upper_river_ribbon: MeshInstance3D = $UpperRiverRibbon
 
 
 func _ready() -> void:
@@ -22,22 +23,48 @@ func _build_terrain_ribbon() -> void:
 		push_warning("TerrainRiverRibbon: terrain or material is unavailable")
 		return
 
+	river_ribbon.mesh = _build_ribbon(
+		terrain,
+		Watercourse.DOWNSTREAM_START_Z,
+		Watercourse.DOWNSTREAM_END_Z,
+		length_segments,
+		false
+	)
+	upper_river_ribbon.mesh = _build_ribbon(
+		terrain,
+		Watercourse.UPPER_STREAM_START_Z,
+		Watercourse.UPPER_STREAM_END_Z,
+		upper_length_segments,
+		true
+	)
+	_align_pool_to_terrain(terrain)
+
+
+func _build_ribbon(
+	terrain: Terrain3D, start_z: float, end_z: float, segment_count: int, is_upper: bool
+) -> ArrayMesh:
 	var vertices := PackedVector3Array()
 	var normals := PackedVector3Array()
 	var uvs := PackedVector2Array()
 	var indices := PackedInt32Array()
 	var row_size := width_segments + 1
-	for z_index in length_segments + 1:
+	for z_index in segment_count + 1:
-		var progress := float(z_index) / float(length_segments)
+		var progress := float(z_index) / float(segment_count)
-		var local_z := lerpf(local_start_z, local_end_z, progress)
+		var world_z := lerpf(start_z, end_z, progress)
-		var downstream_curve := smoothstep(0.58, 1.0, progress) * 12.0
+		var center_x := (
-		var center_offset := sin(progress * TAU) * 1.4 + downstream_curve
+			Watercourse.upper_stream_center_x(world_z)
-		var downstream_taper := lerpf(1.0, 0.45, smoothstep(0.65, 1.0, progress))
+			if is_upper
-		var half_width := river_width * lerpf(0.52, 0.45, progress) * downstream_taper
+			else Watercourse.downstream_center_x(world_z)
+		)
+		var half_width := (
+			Watercourse.upper_stream_half_width(world_z)
+			if is_upper
+			else Watercourse.downstream_half_width(world_z)
+		)
 		for x_index in width_segments + 1:
 			var across := float(x_index) / float(width_segments)
-			var local_x := center_offset + lerpf(-half_width, half_width, across)
+			var world_x := center_x + lerpf(-half_width, half_width, across)
-			var world_sample := to_global(Vector3(local_x, 0.0, local_z))
+			var world_sample := Vector3(world_x, 0.0, world_z)
 			var terrain_height := terrain.data.get_height(world_sample)
 			if is_nan(terrain_height):
 				terrain_height = global_position.y
@@ -47,7 +74,7 @@ func _build_terrain_ribbon() -> void:
 			normals.append(Vector3.UP)
 			uvs.append(Vector2(across, progress))
 
-	for z_index in length_segments:
+	for z_index in segment_count:
 		for x_index in width_segments:
 			var top_left := z_index * row_size + x_index
 			var top_right := top_left + 1
@@ -66,17 +93,20 @@ func _build_terrain_ribbon() -> void:
 	var mesh := ArrayMesh.new()
 	mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
 	mesh.surface_set_material(0, river_material)
-	river_ribbon.mesh = mesh
+	return mesh
-	_align_pool_to_terrain(terrain)
 
 
 func _align_pool_to_terrain(terrain: Terrain3D) -> void:
 	var pool := $PlungePool as MeshInstance3D
-	var pool_sample := to_global(Vector3(pool.position.x, 0.0, pool.position.z))
+	var pool_sample := Vector3(
+		Watercourse.PLUNGE_POOL_CENTER.x, 0.0, Watercourse.PLUNGE_POOL_CENTER.y
+	)
 	var pool_height := terrain.data.get_height(pool_sample)
 	if is_nan(pool_height):
 		return
 	var local_surface := to_local(Vector3(pool_sample.x, pool_height + water_offset, pool_sample.z))
-	for node_name in [&"PlungePool", &"FoamRing", &"FoamAtFall"]:
+	pool.position = local_surface
-		var surface := get_node(NodePath(node_name)) as MeshInstance3D
+	var foam_ring := $FoamRing as MeshInstance3D
-		surface.position.y = local_surface.y
+	foam_ring.position = local_surface + Vector3(0.0, 0.1, 0.0)
+	var foam_at_fall := $FoamAtFall as MeshInstance3D
+	foam_at_fall.position = local_surface + Vector3(0.0, 0.13, -2.7)

world/jajce/WaterBody.tscn

@@ -17,22 +17,22 @@ rings = 2
 [sub_resource type="StandardMaterial3D" id="Material_foam"]
 transparency = 1
 shading_mode = 0
-albedo_color = Color(0.8, 0.93, 0.86, 0.46)
+albedo_color = Color(0.8, 0.93, 0.86, 0.22)
 emission_enabled = true
 emission = Color(0.34, 0.56, 0.48, 1)
-emission_energy_multiplier = 0.18
+emission_energy_multiplier = 0.06
 roughness = 0.74
 
 [sub_resource type="TorusMesh" id="Mesh_foam_ring"]
 material = SubResource("Material_foam")
-inner_radius = 4.8
+inner_radius = 5.15
-outer_radius = 5.65
+outer_radius = 5.5
 rings = 28
 ring_segments = 10
 
 [sub_resource type="PlaneMesh" id="Mesh_foam_patch"]
 material = SubResource("Material_foam")
-size = Vector2(10.5, 2.2)
+size = Vector2(6, 1.5)
 subdivide_width = 8
 subdivide_depth = 2
 
@@ -44,18 +44,18 @@ river_material = SubResource("ShaderMaterial_water")
 [node name="RiverRibbon" type="MeshInstance3D" parent="."]
 cast_shadow = 0
 
+[node name="UpperRiverRibbon" type="MeshInstance3D" parent="."]
+cast_shadow = 0
+
 [node name="PlungePool" type="MeshInstance3D" parent="."]
-position = Vector3(0, -0.02, -25)
 scale = Vector3(1.25, 1, 0.82)
 mesh = SubResource("Mesh_plunge_pool")
 
 [node name="FoamRing" type="MeshInstance3D" parent="."]
-position = Vector3(0, 0.09, -25)
 scale = Vector3(1.25, 0.12, 0.82)
 cast_shadow = 0
 mesh = SubResource("Mesh_foam_ring")
 
 [node name="FoamAtFall" type="MeshInstance3D" parent="."]
-position = Vector3(0, 0.12, -25.8)
 cast_shadow = 0
 mesh = SubResource("Mesh_foam_patch")

world/jajce/WaterfallBody.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=10 format=3]
+[gd_scene load_steps=12 format=3]
 
 [ext_resource type="Shader" path="res://world/jajce/materials/waterfall.gdshader" id="1_waterfall_shader"]
 
@@ -7,7 +7,7 @@ shader = ExtResource("1_waterfall_shader")
 
 [sub_resource type="QuadMesh" id="Mesh_waterfall_body"]
 material = SubResource("ShaderMaterial_waterfall")
-size = Vector2(10.8, 14)
+size = Vector2(9.6, 11.4)
 subdivide_width = 18
 subdivide_depth = 28
 
@@ -32,50 +32,74 @@ size = Vector3(4.8, 5.5, 3.4)
 
 [sub_resource type="BoxMesh" id="Mesh_lip"]
 material = SubResource("Material_rock_moss")
-size = Vector3(11.6, 0.7, 3.2)
+size = Vector3(10.4, 0.65, 3.0)
+
+[sub_resource type="StandardMaterial3D" id="Material_lip_foam"]
+transparency = 1
+shading_mode = 0
+albedo_color = Color(0.82, 0.95, 0.87, 0.72)
+emission_enabled = true
+emission = Color(0.46, 0.72, 0.62, 1)
+emission_energy_multiplier = 0.22
+roughness = 0.62
+
+[sub_resource type="PlaneMesh" id="Mesh_lip_foam"]
+material = SubResource("Material_lip_foam")
+size = Vector2(9.2, 1.45)
+subdivide_width = 8
+subdivide_depth = 2
 
 [node name="WaterfallBody" type="Node3D"]
-position = Vector3(25, 8.9, -24)
+position = Vector3(25, 5.8, -24)
 
 [node name="RockFrame" type="Node3D" parent="."]
 
 [node name="WestCliff" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(-7.2, -0.45, -1)
+position = Vector3(-6.1, -0.15, -0.9)
 rotation_degrees = Vector3(0, 8, -3)
+scale = Vector3(0.72, 0.86, 0.8)
 mesh = SubResource("Mesh_cliff_side")
 
 [node name="EastCliff" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(7.2, -0.25, -1.2)
+position = Vector3(6.2, 0.05, -1.1)
 rotation_degrees = Vector3(0, -7, 4)
+scale = Vector3(0.68, 0.88, 0.76)
 mesh = SubResource("Mesh_cliff_side")
 
 [node name="WestCrownRock" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(-5.0, 7.45, -1.25)
+position = Vector3(-4.9, 5.8, -1.2)
 rotation_degrees = Vector3(8, -14, -11)
-scale = Vector3(0.85, 0.62, 0.9)
+scale = Vector3(0.82, 0.58, 0.88)
 mesh = SubResource("Mesh_rock_lobe")
 
 [node name="EastCrownRock" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(5.1, 7.55, -1.4)
+position = Vector3(4.8, 5.9, -1.35)
 rotation_degrees = Vector3(-6, 12, 9)
-scale = Vector3(0.82, 0.6, 0.86)
+scale = Vector3(0.78, 0.58, 0.84)
 mesh = SubResource("Mesh_rock_lobe")
 
 [node name="WestLowerRock" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(-5.9, -4.8, 0.1)
+position = Vector3(-5.35, -5.0, 0.15)
 rotation_degrees = Vector3(7, 14, 12)
+scale = Vector3(0.88, 0.72, 0.9)
 mesh = SubResource("Mesh_rock_lobe")
 
 [node name="EastLowerRock" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(6.0, -4.4, 0)
+position = Vector3(5.45, -4.75, 0)
 rotation_degrees = Vector3(-4, -12, -9)
+scale = Vector3(0.9, 0.74, 0.88)
 mesh = SubResource("Mesh_rock_lobe")
 
 [node name="RiverLip" type="MeshInstance3D" parent="RockFrame"]
-position = Vector3(0, 7.05, 0.2)
+position = Vector3(0, 5.42, -0.2)
 mesh = SubResource("Mesh_lip")
 
+[node name="LipFoam" type="MeshInstance3D" parent="RockFrame"]
+position = Vector3(0, 5.74, -0.85)
+cast_shadow = 0
+mesh = SubResource("Mesh_lip_foam")
+
 [node name="FallingWater" type="MeshInstance3D" parent="."]
-position = Vector3(0, 0, 1.05)
+position = Vector3(0, 0, 1.1)
 cast_shadow = 0
 mesh = SubResource("Mesh_waterfall_body")

world/jajce/WaterfallMist.tscn

@@ -1,4 +1,6 @@
-[gd_scene load_steps=4 format=3]
+[gd_scene load_steps=5 format=3]
+
+[ext_resource type="Texture2D" path="res://world/jajce/materials/mist_soft.svg" id="1_mist_texture"]
 
 [sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_mist"]
 lifetime_randomness = 0.35
@@ -7,26 +9,27 @@ gravity = Vector3(0, -0.35, 0)
 initial_velocity_min = 0.25
 initial_velocity_max = 1.2
 scale_min = 0.08
-scale_max = 2.0
+scale_max = 1.35
-color = Color(0.82, 0.94, 0.96, 0.35)
+color = Color(0.82, 0.94, 0.96, 0.22)
 emission_shape = 1
 emission_box_extents = Vector3(5.8, 1.5, 1.35)
 
 [sub_resource type="StandardMaterial3D" id="Material_mist"]
-albedo_color = Color(0.82, 0.94, 0.96, 0.28)
+albedo_color = Color(0.82, 0.94, 0.96, 0.3)
 transparency = 1
 shading_mode = 0
+albedo_texture = ExtResource("1_mist_texture")
 billboard_mode = 1
 cull_mode = 0
 
 [sub_resource type="QuadMesh" id="Mesh_mist"]
 material = SubResource("Material_mist")
-size = Vector2(1.8, 1.8)
+size = Vector2(1.45, 1.45)
 
 [node name="WaterfallMist" type="GPUParticles3D"]
-position = Vector3(25, 2.05, -24)
+position = Vector3(25, 0.65, -21.5)
 emitting = true
-amount = 96
+amount = 56
 lifetime = 3.0
 one_shot = false
 preprocess = 1.5

world/jajce/materials/mist_soft.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="64" height="64" viewBox="0 0 64 64">
+  <defs>
+    <radialGradient id="mist" cx="50%" cy="48%" r="50%">
+      <stop offset="0" stop-color="#dff4ef" stop-opacity="0.82"/>
+      <stop offset="0.42" stop-color="#c8e7e3" stop-opacity="0.48"/>
+      <stop offset="0.76" stop-color="#b8d9d7" stop-opacity="0.14"/>
+      <stop offset="1" stop-color="#b8d9d7" stop-opacity="0"/>
+    </radialGradient>
+  </defs>
+  <circle cx="32" cy="32" r="31" fill="url(#mist)"/>
+</svg>

world/jajce/materials/mist_soft.svg.import

@@ -0,0 +1,43 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c0ie27xnkmfd8"
+path="res://.godot/imported/mist_soft.svg-8d0454048e96ea4cac3f1157714c34e4.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://world/jajce/materials/mist_soft.svg"
+dest_files=["res://.godot/imported/mist_soft.svg-8d0454048e96ea4cac3f1157714c34e4.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false