feat(tools): irregular strata and angular boulder blocks

Strata gain a dip, a slow seeded warp that bends and notches the beds, and
a per-bed thickness and hardness jitter with ordered boundaries, so walls
never invert. BoulderField gains an angularity parameter: elongated
super-ellipse slabs with flat tops, sharp shoulders, random heading and
tilt, footprint area preserved. Both sites are re-baked with the new
settings; the coral heads stay rounded.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

content/sites/zone1_vigilant.tres

@@ -33,14 +33,14 @@ footprint_m = Vector3(26, 6, 8)
 script = ExtResource("1_n3xpu")
 placement_id = &"secondary_item"
 kind = 2
-position_m = Vector3(-6, -63.26594, 160)
+position_m = Vector3(-6, -63.33776, 160)
 footprint_m = Vector3(1, 1, 1)
 
 [sub_resource type="Resource" id="Resource_aervf"]
 script = ExtResource("1_n3xpu")
 placement_id = &"debris_1"
 kind = 3
-position_m = Vector3(-12, -45.80824, 136)
+position_m = Vector3(-12, -45.58156, 136)
 yaw_radians = 0.4
 footprint_m = Vector3(3, 2, 2)
 
@@ -48,7 +48,7 @@ footprint_m = Vector3(3, 2, 2)
 script = ExtResource("1_n3xpu")
 placement_id = &"debris_2"
 kind = 3
-position_m = Vector3(-10, -47.295185, 139)
+position_m = Vector3(-10, -48.026417, 139)
 yaw_radians = 1.2
 footprint_m = Vector3(6, 2.5, 2.5)
 
@@ -56,14 +56,14 @@ footprint_m = Vector3(6, 2.5, 2.5)
 script = ExtResource("1_n3xpu")
 placement_id = &"debris_3"
 kind = 3
-position_m = Vector3(-9, -52.854576, 146)
+position_m = Vector3(-9, -52.89768, 146)
 footprint_m = Vector3(2, 1.5, 2)
 
 [sub_resource type="Resource" id="Resource_hd5cl"]
 script = ExtResource("1_n3xpu")
 placement_id = &"debris_4"
 kind = 3
-position_m = Vector3(-7, -58.174175, 152)
+position_m = Vector3(-7, -57.539745, 152)
 yaw_radians = 2.0
 footprint_m = Vector3(4, 1.5, 1.5)
 

docs/briefs/terrain-varied-landforms.md

@@ -84,14 +84,14 @@ ou `smoothstep`) et **mono-segment**. Il manque :
 |---|---|---|
 | `Canyon` | `path: PackedVector2Array`, `half_width_m`, `depth_m`, `wall_softness_m`, `edge_seed`, `edge_amplitude_m`, `floor_material` | tranchée à fond plat le long d'une polyligne ; parois `smoothstep` sur `wall_softness_m` ; distance au tracé perturbée par un bruit de contour ; se referme sur une demi-largeur à chaque bout ; impose `floor_material` (sable en général) sur le fond plat, même à travers une butte rocheuse |
 | `Outcrop` | `centre`, `radius_x_m`, `radius_z_m`, `height_m`, `wall_width_m`, `edge_seed`, `edge_amplitude_m`, `rock_top` | butte elliptique à sommet plat, flanc de largeur `wall_width_m`, contour perturbé ; matériau roche partout où elle dépasse 30 % de sa hauteur si `rock_top` |
-| `BoulderField` | `centre`, `radius_m`, `seed`, `count`, `boulder_radius_min_m`, `boulder_radius_max_m`, `height_ratio` | `count` demi-ellipsoïdes tirés par `RandomNumberGenerator` seedé dans le disque, combinés par **maximum** ; roche sur toute leur emprise |
+| `BoulderField` | `centre`, `radius_m`, `seed`, `count`, `boulder_radius_min_m`, `boulder_radius_max_m`, `height_ratio`, `angularity` (0–1) | `count` blocs tirés par `RandomNumberGenerator` seedé dans le disque, combinés par **maximum** ; roche sur toute leur emprise ; `angularity` 0 = demi-ellipsoïdes, 1 = dalles en super-ellipse allongées, orientées et basculées au hasard, sommet plat et épaules vives |
 | `Escarpment` | `path: PackedVector2Array`, `drop_m`, `softness_m`, `slope_beyond`, `edge_seed`, `edge_amplitude_m` | `Step` le long d'une polyligne : le terrain descend à **droite** du sens de parcours ; ligne de crête perturbée par un bruit de contour |
 
 ### 4.3 Nouveau modificateur
 
 | Modificateur | Paramètres | Effet |
 |---|---|---|
-| `Strata` | `layer_height_m`, `sharpness` (0–1), `minimum_slope_degrees`, `full_slope_degrees`, `region_m: Rect2` (vide = partout) | quantifie l'élévation en gradins de `layer_height_m` là où la pente dépasse `minimum_slope_degrees` (plein effet à `full_slope_degrees`) ; `sharpness` 0 = aucun effet, 1 = marches franches ; le fond plat et le plateau ne bougent pas |
+| `Strata` | `layer_height_m`, `sharpness` (0–1), `minimum_slope_degrees`, `full_slope_degrees`, `region_m: Rect2` (vide = partout), `dip`, `warp_seed`, `warp_amplitude_m`, `thickness_variation` | quantifie l'élévation en gradins d'environ `layer_height_m` là où la pente dépasse `minimum_slope_degrees` (plein effet à `full_slope_degrees`) ; `sharpness` 0 = aucun effet, 1 = marches franches ; le fond plat et le plateau ne bougent pas ; `dip` incline la pile, le warp courbe et encoche les bancs, chaque banc a son épaisseur et sa dureté, les bornes restent ordonnées (pas d'inversion) |
 
 Formule : `f = frac(e / h)`, `f' = clamp((f - 0.5) / (1 - s) + 0.5, 0, 1)`,
 `e' = lerp(e, floor(e / h) * h + h * f', w)` avec

tests/unit/run_site_baker_tests.gd

@@ -8,7 +8,7 @@ const SiteTerrainData = preload("res://game/domain/sites/site_terrain_data.gd")
 
 const ZONE1_TERRAIN_PATH := "res://content/sites/zone1_vigilant_terrain.res"
 
-const TEST_COUNT := 48
+const TEST_COUNT := 53
 
 var _failures: Array[String] = []
 
@@ -24,6 +24,8 @@ func _init() -> void:
 	_test_boulder_field()
 	_test_strata()
 	_test_slope_roughness()
+	_test_irregular_strata()
+	_test_angular_boulders()
 
 	if _failures.is_empty():
 		print("Site baker unit tests: %d passed, 0 failed." % TEST_COUNT)
@@ -225,6 +227,72 @@ func _test_strata() -> void:
 	_expect(north_same and south_changed, "strata stay inside their region")
 
 
+func _test_irregular_strata() -> void:
+	# 45 degree plane at 0.5 m per cell, beds of 2 m with dip, warp and thickness variation.
+	var recipe := _small_recipe()
+	recipe.columns = 81
+	recipe.rows = 81
+	recipe.cell_size_m = 0.5
+	recipe.origin_x_m = -20.0
+	recipe.origin_z_m = -20.0
+	recipe.primitives.append(SiteTerrainBaker.SlopedPlane.new(30.3, 1.0, 0.0, 0.0, 0.0))
+	var regular_recipe := _small_recipe()
+	regular_recipe.columns = 81
+	regular_recipe.rows = 81
+	regular_recipe.cell_size_m = 0.5
+	regular_recipe.origin_x_m = -20.0
+	regular_recipe.origin_z_m = -20.0
+	regular_recipe.primitives.append(SiteTerrainBaker.SlopedPlane.new(30.3, 1.0, 0.0, 0.0, 0.0))
+	regular_recipe.modifiers.append(SiteTerrainBaker.Strata.new(2.0, 0.9, 20.0, 35.0, Rect2()))
+	var regular := SiteTerrainBaker.bake(regular_recipe)
+	recipe.modifiers.append(SiteTerrainBaker.Strata.new(2.0, 0.9, 20.0, 35.0, Rect2(), Vector2(0.0, 0.05), 11, 1.0, 0.6))
+	var irregular := SiteTerrainBaker.bake(recipe)
+	var monotonic := true
+	var ledges := 0
+	var on_ledge := false
+	var off_grid_ledges := 0
+	for column in range(10, 70):
+		var here := irregular.elevations_m[irregular.index_of(column, 40)]
+		var next := irregular.elevations_m[irregular.index_of(column + 1, 40)]
+		# Ledges follow the bent beds, so a ledge may tilt back a little; the wall
+		# itself must never step down.
+		monotonic = monotonic and next >= here - 0.3
+		if next - here < 0.1:
+			if not on_ledge:
+				ledges += 1
+				var nearest_regular := roundf(here / 2.0) * 2.0
+				if absf(here - nearest_regular) > 0.2:
+					off_grid_ledges += 1
+			on_ledge = true
+		else:
+			on_ledge = false
+	_expect(monotonic, "irregular strata never cut a back-step deeper than 0.3 m")
+	_expect(ledges >= 4, "irregular strata still cut distinct ledges (%d)" % ledges)
+	_expect(off_grid_ledges >= 2, "irregular bed boundaries leave the regular 2 m grid (%d of %d)" % [off_grid_ledges, ledges])
+	var north := irregular.elevations_m[irregular.index_of(40, 10)]
+	var south := irregular.elevations_m[irregular.index_of(40, 70)]
+	var regular_north := regular.elevations_m[regular.index_of(40, 10)]
+	var regular_south := regular.elevations_m[regular.index_of(40, 70)]
+	_expect(absf((south - north) - (regular_south - regular_north)) > 0.3, "dip and warp move the ledges along the wall")
+
+
+func _test_angular_boulders() -> void:
+	var round := SiteTerrainBaker.BoulderField.new(Vector2.ZERO, 0.0, 21, 1, 5.0, 5.0, 1.0, 0.0)
+	var angular := SiteTerrainBaker.BoulderField.new(Vector2.ZERO, 0.0, 21, 1, 5.0, 5.0, 1.0, 1.0)
+	_expect(round.boulders() == angular.boulders(), "angularity changes the shape, not the placement")
+	var round_ring := 0.0
+	var angular_ring := 0.0
+	var bounded := true
+	for step in 16:
+		var angle := TAU * float(step) / 16.0
+		round_ring += round.elevation_delta(1.5 * cos(angle), 1.5 * sin(angle))
+		var height := angular.elevation_delta(1.5 * cos(angle), 1.5 * sin(angle))
+		angular_ring += height
+		bounded = bounded and height <= 5.0 * (1.0 + SiteTerrainBaker.BoulderField.MAXIMUM_TILT) + 0.001
+	_expect(angular_ring > round_ring, "angular blocks have flatter tops than half-ellipsoids")
+	_expect(bounded, "angular block height stays within the tilt bound")
+
+
 func _test_slope_roughness() -> void:
 	var recipe := _small_recipe()
 	recipe.primitives.append(SiteTerrainBaker.SlopedPlane.new(30.0, 0.0, 0.0, 0.0, 0.0))

tools/site_terrain_baker.gd

@@ -309,14 +309,31 @@ class Outcrop extends Primitive:
 		return NO_MATERIAL
 
 
-## count half-ellipsoid boulders scattered uniformly in a disc by a seeded generator.
+## count boulders scattered uniformly in a disc by a seeded generator. Boulders combine
-## Boulders combine by maximum, so overlapping blocks never pile into one mound, and every
+## by maximum, so overlapping blocks never pile into one mound, and every cell they cover
-## cell they cover is rock.
+## is rock. angularity 0 gives half-ellipsoids; towards 1 the blocks become elongated
+## super-ellipses with flat tops, sharp shoulders, a random heading and a tilt, like
+## fallen slabs. The footprint area is preserved whatever the elongation.
 class BoulderField extends Primitive:
+	const MAXIMUM_ASPECT := 2.2
+	const MAXIMUM_TILT := 0.35
+
+	## One block: centre, radius, heading, elongation, outline exponent, shoulder
+	## exponent and tilt across its long axis.
+	class Block extends RefCounted:
+		var centre: Vector2
+		var radius_m: float
+		var yaw: float
+		var aspect: float
+		var outline_power: float
+		var shoulder_power: float
+		var tilt: float
+
 	var centre: Vector2
 	var radius_m: float
 	var height_ratio: float
-	var _boulders := PackedVector3Array()  # x, z, radius
+	var angularity: float
+	var _blocks: Array[Block] = []
 	var _reach_m: float
 
 	func _init(
@@ -326,40 +343,69 @@ class BoulderField extends Primitive:
 		p_count: int,
 		p_boulder_radius_min_m: float,
 		p_boulder_radius_max_m: float,
-		p_height_ratio: float
+		p_height_ratio: float,
+		p_angularity: float = 0.0
 	) -> void:
 		centre = p_centre
 		radius_m = p_radius_m
 		height_ratio = p_height_ratio
-		_reach_m = p_radius_m + p_boulder_radius_max_m
+		angularity = clampf(p_angularity, 0.0, 1.0)
+		_reach_m = p_radius_m + p_boulder_radius_max_m * sqrt(lerpf(1.0, MAXIMUM_ASPECT, angularity))
 		var generator := RandomNumberGenerator.new()
 		generator.seed = p_seed
 		for _index in p_count:
 			var distance := p_radius_m * sqrt(generator.randf())
 			var angle := TAU * generator.randf()
-			var boulder_radius := generator.randf_range(p_boulder_radius_min_m, p_boulder_radius_max_m)
+			var block := Block.new()
-			_boulders.append(Vector3(
+			block.centre = p_centre + Vector2(distance * cos(angle), distance * sin(angle))
-				p_centre.x + distance * cos(angle),
+			block.radius_m = generator.randf_range(p_boulder_radius_min_m, p_boulder_radius_max_m)
-				p_centre.y + distance * sin(angle),
+			# Draw every shape number even at angularity 0 so a field keeps the same
-				boulder_radius
+			# positions and radii when its angularity is changed.
-			))
+			var yaw := TAU * generator.randf()
+			var aspect := generator.randf_range(1.0, MAXIMUM_ASPECT)
+			var outline := generator.randf_range(3.0, 6.0)
+			var shoulder := generator.randf_range(3.0, 6.0)
+			var tilt := generator.randf_range(-MAXIMUM_TILT, MAXIMUM_TILT)
+			block.yaw = yaw
+			block.aspect = lerpf(1.0, aspect, angularity)
+			block.outline_power = lerpf(2.0, outline, angularity)
+			block.shoulder_power = lerpf(2.0, shoulder, angularity)
+			block.tilt = tilt * angularity
+			_blocks.append(block)
 
+	## Centre x, centre z and radius of every block, in generation order.
 	func boulders() -> PackedVector3Array:
-		return _boulders
+		var result := PackedVector3Array()
+		for block in _blocks:
+			result.append(Vector3(block.centre.x, block.centre.y, block.radius_m))
+		return result
 
 	func elevation_delta(x_m: float, z_m: float) -> float:
 		if Vector2(x_m, z_m).distance_to(centre) > _reach_m:
 			return 0.0
 		var highest := 0.0
-		for boulder in _boulders:
+		for block in _blocks:
-			var dx := x_m - boulder.x
+			highest = maxf(highest, _block_height(block, x_m, z_m))
-			var dz := z_m - boulder.y
-			var squared := dx * dx + dz * dz
-			var radius_squared := boulder.z * boulder.z
-			if squared < radius_squared:
-				highest = maxf(highest, boulder.z * height_ratio * sqrt(1.0 - squared / radius_squared))
 		return highest
 
+	func _block_height(block: Block, x_m: float, z_m: float) -> float:
+		var dx := x_m - block.centre.x
+		var dz := z_m - block.centre.y
+		var long_axis_m := block.radius_m * sqrt(block.aspect)
+		if dx * dx + dz * dz >= long_axis_m * long_axis_m:
+			return 0.0
+		var short_axis_m := block.radius_m / sqrt(block.aspect)
+		var along := (cos(block.yaw) * dx + sin(block.yaw) * dz) / long_axis_m
+		var across := (-sin(block.yaw) * dx + cos(block.yaw) * dz) / short_axis_m
+		var outline := pow(
+			pow(absf(along), block.outline_power) + pow(absf(across), block.outline_power),
+			1.0 / block.outline_power
+		)
+		if outline >= 1.0:
+			return 0.0
+		var profile := pow(1.0 - pow(outline, block.shoulder_power), 1.0 / block.shoulder_power)
+		return maxf(block.radius_m * height_ratio * profile * (1.0 + block.tilt * along), 0.0)
+
 	func material_at(x_m: float, z_m: float) -> int:
 		if elevation_delta(x_m, z_m) > 0.0:
 			return SonarMaterial.Value.ROCK
@@ -444,32 +490,67 @@ class Modifier extends RefCounted:
 		return elevation_m
 
 
-## Quantises steep ground into horizontal ledges layer_height_m apart: the stratified
+## Quantises steep ground into ledges about layer_height_m apart: the stratified walls
-## walls of a canyon or cliff. Flat floors and summits are below minimum_slope_degrees and
+## of a canyon or cliff. Flat floors and summits are below minimum_slope_degrees and stay
-## stay untouched; the effect is full from full_slope_degrees. sharpness 0 leaves the
+## untouched; the effect is full from full_slope_degrees. sharpness 0 leaves the field
-## field unchanged, 1 cuts hard steps. region_m is a world-space (x, z) rectangle with a
+## unchanged, 1 cuts hard steps. region_m is a world-space (x, z) rectangle with a hard
-## hard edge; an empty rectangle applies everywhere. Ledges need two to three cells of
+## edge; an empty rectangle applies everywhere.
-## wall per layer to be resolved: at 1.5 m per cell, 4 m layers on a 50 degree wall.
+##
+## Real beds are neither horizontal nor equal: dip tilts the whole stack (metres of
+## elevation per metre along x and z), warp_amplitude_m bends the beds with slow seeded
+## noise so ledges pinch, swell and notch, and thickness_variation (0 to under 1) gives
+## every bed its own thickness and hardness, constant along the bed. Bed boundaries stay
+## ordered, so the quantised wall never inverts. All three default to the regular case.
+## Ledges need two to three cells of wall per layer to be resolved: at 1.5 m per cell,
+## 4 m layers on a 50 degree wall.
 class Strata extends Modifier:
+	const BED_SHARPNESS_SPREAD := 0.3
+
 	var layer_height_m: float
 	var sharpness: float
 	var region_m: Rect2
+	var dip: Vector2
+	var warp_amplitude_m: float
+	var thickness_variation: float
 	var _minimum_tangent: float
 	var _full_tangent: float
+	var _slow_warp: FastNoiseLite
+	var _notch_warp: FastNoiseLite
+	var _bed_noise: FastNoiseLite
 
 	func _init(
 		p_layer_height_m: float,
 		p_sharpness: float,
 		p_minimum_slope_degrees: float,
 		p_full_slope_degrees: float,
-		p_region_m: Rect2
+		p_region_m: Rect2,
+		p_dip: Vector2 = Vector2.ZERO,
+		p_warp_seed: int = 0,
+		p_warp_amplitude_m: float = 0.0,
+		p_thickness_variation: float = 0.0
 	) -> void:
 		assert(p_layer_height_m > 0.0, "strata need a positive layer height")
 		layer_height_m = p_layer_height_m
 		sharpness = clampf(p_sharpness, 0.0, 0.999)
 		region_m = p_region_m
+		dip = p_dip
+		warp_amplitude_m = p_warp_amplitude_m
+		thickness_variation = clampf(p_thickness_variation, 0.0, 0.9)
 		_minimum_tangent = tan(deg_to_rad(p_minimum_slope_degrees))
 		_full_tangent = tan(deg_to_rad(p_full_slope_degrees))
+		if p_warp_amplitude_m > 0.0:
+			_slow_warp = _make_noise(p_warp_seed, 0.016, 2)
+			_notch_warp = _make_noise(p_warp_seed + 1, 0.09, 2)
+		if thickness_variation > 0.0:
+			_bed_noise = _make_noise(p_warp_seed + 2, 1.0, 1)
+
+	static func _make_noise(seed: int, frequency: float, octaves: int) -> FastNoiseLite:
+		var noise := FastNoiseLite.new()
+		noise.noise_type = FastNoiseLite.TYPE_SIMPLEX_SMOOTH
+		noise.seed = seed
+		noise.frequency = frequency
+		noise.fractal_octaves = octaves
+		return noise
 
 	func modify(x_m: float, z_m: float, elevation_m: float, gradient: Vector2) -> float:
 		if region_m.has_area() and not region_m.has_point(Vector2(x_m, z_m)):
@@ -477,10 +558,43 @@ class Strata extends Modifier:
 		var weight := smoothstep(_minimum_tangent, _full_tangent, gradient.length())
 		if weight <= 0.0:
 			return elevation_m
-		var layer := floorf(elevation_m / layer_height_m)
+		# Work in "bed space": the stack tilted by the dip and bent by the warp.
-		var fraction := elevation_m / layer_height_m - layer
+		var bed_elevation := elevation_m - dip.x * x_m - dip.y * z_m
-		var sharpened := clampf((fraction - 0.5) / (1.0 - sharpness) + 0.5, 0.0, 1.0)
+		if _slow_warp != null:
-		return lerpf(elevation_m, (layer + sharpened) * layer_height_m, weight)
+			bed_elevation += _slow_warp.get_noise_2d(x_m, z_m) * warp_amplitude_m
+			bed_elevation += _notch_warp.get_noise_2d(x_m, z_m) * warp_amplitude_m * 0.25
+		var bed := floorf(bed_elevation / layer_height_m)
+		var floor_m := _bed_boundary(bed)
+		var ceiling_m := _bed_boundary(bed + 1.0)
+		# Jittered boundaries can leave the point just outside its nominal bed.
+		if bed_elevation < floor_m:
+			bed -= 1.0
+			ceiling_m = floor_m
+			floor_m = _bed_boundary(bed)
+		elif bed_elevation >= ceiling_m:
+			bed += 1.0
+			floor_m = ceiling_m
+			ceiling_m = _bed_boundary(bed + 1.0)
+		var fraction := (bed_elevation - floor_m) / (ceiling_m - floor_m)
+		var bed_sharpness := sharpness
+		if _bed_noise != null:
+			bed_sharpness = clampf(
+				sharpness + _bed_noise.get_noise_1d(bed * 17.0 + 5.0) * BED_SHARPNESS_SPREAD,
+				0.0,
+				0.999
+			)
+		var sharpened := clampf((fraction - 0.5) / (1.0 - bed_sharpness) + 0.5, 0.0, 1.0)
+		var quantised := floor_m + sharpened * (ceiling_m - floor_m)
+		# Apply the change in bed space back to the real elevation.
+		return elevation_m + (quantised - bed_elevation) * weight
+
+	## Lower boundary of a bed in bed space. The jitter is under half a layer, so the
+	## boundaries keep their order and every bed keeps a positive thickness.
+	func _bed_boundary(bed: float) -> float:
+		var boundary := bed * layer_height_m
+		if _bed_noise != null:
+			boundary += _bed_noise.get_noise_1d(bed * 17.0) * 0.5 * thickness_variation * layer_height_m
+		return boundary
 
 
 ## Seeded noise weighted by the local slope: rock faces and ridge flanks get crumbly

tools/sites/terrain_showcase_recipe.gd

@@ -68,16 +68,17 @@ static func recipe() -> SiteTerrainBaker.Recipe:
 		SiteTerrainBaker.Outcrop.new(EAST_BUTTE_CENTRE, 38.0, 75.0, 9.0, 8.0, 202, 5.0, true),
 		SiteTerrainBaker.Canyon.new(PackedVector2Array(CREVASSE_PATH), CREVASSE_HALF_WIDTH_M, CREVASSE_DEPTH_M, 1.0, 203, 1.0, SonarMaterial.Value.SAND),
 
-		# SW — le Chaos: ninety boulders of 2-6 m radius plus six coral heads, on rippled sand.
+		# SW — le Chaos: ninety angular blocks of 2-6 m radius plus six rounded coral heads,
-		SiteTerrainBaker.BoulderField.new(BOULDER_FIELD_CENTRE, BOULDER_FIELD_RADIUS_M, 301, 90, 2.0, 6.0, 0.7),
+		# on rippled sand.
-		SiteTerrainBaker.BoulderField.new(Vector2(-100.0, 130.0), 40.0, 302, 6, 6.0, 9.0, 0.6),
+		SiteTerrainBaker.BoulderField.new(BOULDER_FIELD_CENTRE, BOULDER_FIELD_RADIUS_M, 301, 90, 2.0, 6.0, 0.7, 0.85),
+		SiteTerrainBaker.BoulderField.new(Vector2(-100.0, 130.0), 40.0, 302, 6, 6.0, 9.0, 0.6, 0.0),
 		SiteTerrainBaker.Ripples.new(Vector2(1.0, 0.3), 3.5, 0.3, BOULDER_FIELD_CENTRE, 110.0),
 
 		# SE — les Éperons: two pitted rock spurs 7-8 m high framing a 20 m sand channel
 		# littered with small blocks.
 		SiteTerrainBaker.Outcrop.new(WEST_SPUR_CENTRE, 30.0, 60.0, 8.0, 5.0, 401, 7.0, true),
 		SiteTerrainBaker.Outcrop.new(EAST_SPUR_CENTRE, 30.0, 55.0, 7.0, 5.0, 402, 7.0, true),
-		SiteTerrainBaker.BoulderField.new(CHANNEL_CENTRE, 50.0, 403, 12, 1.5, 3.0, 0.8),
+		SiteTerrainBaker.BoulderField.new(CHANNEL_CENTRE, 50.0, 403, 12, 1.5, 3.0, 0.8, 1.0),
 
 		# S — la Corniche: sinuous 22 m escarpment, then a 42 degree slope to the 80 m floor,
 		# with rounded knolls on the slope.
@@ -97,8 +98,13 @@ static func recipe() -> SiteTerrainBaker.Recipe:
 	result.modifiers = [
 		# Crumbly rock faces, smooth sand. Before the strata so the ledges stay flat.
 		SiteTerrainBaker.SlopeRoughness.new(2028, 0.12, 0.7, 20.0, 40.0),
-		# Strata on the north-west quarter only (mesa flanks and canyon walls): 4 m ledges.
+		# Strata on the north-west quarter only (mesa flanks and canyon walls): beds of
-		SiteTerrainBaker.Strata.new(4.0, 0.85, 30.0, 50.0, Rect2(-256.0, -256.0, 256.0, 256.0)),
+		# about 4 m, dipping 1.3 degrees to the south-east, bent by 2.4 m of slow warp,
+		# each bed with its own thickness and hardness.
+		SiteTerrainBaker.Strata.new(
+			4.0, 0.85, 30.0, 50.0, Rect2(-256.0, -256.0, 256.0, 256.0),
+			Vector2(0.015, 0.018), 105, 2.4, 0.5
+		),
 	]
 	return result
 

tools/sites/zone1_vigilant_recipe.gd

@@ -75,7 +75,10 @@ static func recipe() -> SiteTerrainBaker.Recipe:
 		# Crumbly rock on every slope steeper than the sand rule, smooth sand elsewhere.
 		# Before the strata so the ledges stay flat.
 		SiteTerrainBaker.SlopeRoughness.new(1935, 0.12, 0.7, 20.0, 40.0),
-		SiteTerrainBaker.Strata.new(4.0, 0.85, 25.0, 40.0, Rect2(-384.0, STRATA_START_Z, 768.0, 384.0 - STRATA_START_Z)),
+		SiteTerrainBaker.Strata.new(
+			4.0, 0.85, 25.0, 40.0, Rect2(-384.0, STRATA_START_Z, 768.0, 384.0 - STRATA_START_Z),
+			Vector2(0.008, 0.0), 1938, 2.0, 0.45
+		),
 	]
 	result.material_patches = [
 		SiteTerrainBaker.MaterialPatch.new(Vector2(140.0, 40.0), 28.0, SonarMaterial.Value.ROCK),