From 8ab1289d106f3c1b5b7df56bb5840c710c1dbfd0 Mon Sep 17 00:00:00 2001
From: Olivier <olivier.delbruyere@hotmail.com>
Date: Tue, 6 Oct 2026 20:01:36 +0200
Subject: [PATCH] feat(tools): declarative site terrain baker and calibration
 recipe

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
---
 content/sites/vehicle_test_terrain.res        | Bin 0 -> 21604 bytes
 .../captures/vehicle_test_terrain_preview.png | Bin 0 -> 2516 bytes
 .../vehicle_test_terrain_preview.png.import   |  40 +++
 scripts/quality_gate.sh                       |   8 +
 tests/run_load_checks.gd                      |   1 +
 tests/unit/run_site_baker_tests.gd            |  71 +++++
 tools/bake_site_terrain.gd                    |  58 ++++
 tools/site_terrain_baker.gd                   | 258 ++++++++++++++++++
 tools/sites/vehicle_test_terrain_recipe.gd    |  25 ++
 9 files changed, 461 insertions(+)
 create mode 100644 content/sites/vehicle_test_terrain.res
 create mode 100644 docs/briefs/captures/vehicle_test_terrain_preview.png
 create mode 100644 docs/briefs/captures/vehicle_test_terrain_preview.png.import
 create mode 100644 tests/unit/run_site_baker_tests.gd
 create mode 100644 tools/bake_site_terrain.gd
 create mode 100644 tools/site_terrain_baker.gd
 create mode 100644 tools/sites/vehicle_test_terrain_recipe.gd

diff --git a/content/sites/vehicle_test_terrain.res b/content/sites/vehicle_test_terrain.res
new file mode 100644
index 0000000000000000000000000000000000000000..496f48d7c8a9230f59e87cf12905dc9e4bb4d3cb
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diff --git a/docs/briefs/captures/vehicle_test_terrain_preview.png.import b/docs/briefs/captures/vehicle_test_terrain_preview.png.import
new file mode 100644
index 0000000..c5bc213
--- /dev/null
+++ b/docs/briefs/captures/vehicle_test_terrain_preview.png.import
@@ -0,0 +1,40 @@
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+}
+
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+dest_files=["res://.godot/imported/vehicle_test_terrain_preview.png-4e68e296dd4625902c8d2c03244ab133.ctex"]
+
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diff --git a/scripts/quality_gate.sh b/scripts/quality_gate.sh
index 2ffbf89..cf8a391 100755
--- a/scripts/quality_gate.sh
+++ b/scripts/quality_gate.sh
@@ -123,6 +123,14 @@ check_godot_log \
 	"production site application unit tests" \
 	"$QUALITY_TEMP_DIRECTORY/site-application-unit-console.log"
 
+printf 'Quality gate: site baker unit tests\n'
+"$GODOT_EXECUTABLE" --headless \
+	--log-file "$QUALITY_TEMP_DIRECTORY/site-baker-unit.log" \
+	--path . \
+	--script tests/unit/run_site_baker_tests.gd \
+	2>&1 | tee "$QUALITY_TEMP_DIRECTORY/site-baker-unit-console.log"
+check_godot_log "site baker unit tests" "$QUALITY_TEMP_DIRECTORY/site-baker-unit-console.log"
+
 printf 'Quality gate: production foundation integration\n'
 "$GODOT_EXECUTABLE" --headless \
 	--log-file "$QUALITY_TEMP_DIRECTORY/foundation-integration.log" \
diff --git a/tests/run_load_checks.gd b/tests/run_load_checks.gd
index 26f868c..672bd65 100644
--- a/tests/run_load_checks.gd
+++ b/tests/run_load_checks.gd
@@ -4,6 +4,7 @@ const SEARCH_ROOTS := [
 	"res://src",
 	"res://game",
 	"res://content",
+	"res://tools",
 	"res://scenes",
 	"res://tests",
 ]
diff --git a/tests/unit/run_site_baker_tests.gd b/tests/unit/run_site_baker_tests.gd
new file mode 100644
index 0000000..3713530
--- /dev/null
+++ b/tests/unit/run_site_baker_tests.gd
@@ -0,0 +1,71 @@
+extends SceneTree
+
+const SonarMaterial = preload("res://game/domain/sonar/sonar_material.gd")
+const SiteTerrainBaker = preload("res://tools/site_terrain_baker.gd")
+const VehicleTestRecipe = preload("res://tools/sites/vehicle_test_terrain_recipe.gd")
+
+const TEST_COUNT := 10
+
+var _failures: Array[String] = []
+
+
+func _init() -> void:
+	_test_plane_and_blob()
+	_test_materials_and_determinism()
+
+	if _failures.is_empty():
+		print("Site baker unit tests: %d passed, 0 failed." % TEST_COUNT)
+		quit(0)
+	else:
+		for failure: String in _failures:
+			push_error(failure)
+		print("Site baker unit tests: %d failed." % _failures.size())
+		quit(1)
+
+
+func _small_recipe() -> SiteTerrainBaker.Recipe:
+	var recipe := SiteTerrainBaker.Recipe.new()
+	recipe.columns = 21
+	recipe.rows = 21
+	recipe.cell_size_m = 2.0
+	recipe.origin_x_m = -20.0
+	recipe.origin_z_m = -20.0
+	recipe.floor_elevation_m = -80.0
+	recipe.rock_slope_degrees = 20.0
+	return recipe
+
+
+func _test_plane_and_blob() -> void:
+	var recipe := _small_recipe()
+	recipe.primitives.append(SiteTerrainBaker.SlopedPlane.new(30.0, 0.0, 0.1, 0.0, 0.0))
+	var data := SiteTerrainBaker.bake(recipe)
+	_expect(data != null and data.validation_error().is_empty(), "plane recipe bakes valid data")
+	_expect(is_equal_approx(data.elevations_m[data.index_of(10, 10)], -30.0), "plane depth at the reference point")
+	_expect(is_equal_approx(data.elevations_m[data.index_of(10, 20)], -28.0), "plane slopes along +Z")
+	_expect(data.materials[data.index_of(10, 10)] == SonarMaterial.Value.SAND, "gentle plane is sand")
+
+	recipe.primitives.append(SiteTerrainBaker.Blob.new(Vector2(0.0, 0.0), 4.0, 4.0, 10.0))
+	data = SiteTerrainBaker.bake(recipe)
+	_expect(is_equal_approx(data.elevations_m[data.index_of(10, 10)], -20.0), "blob adds its amplitude at the centre")
+	_expect(data.materials[data.index_of(12, 10)] == SonarMaterial.Value.ROCK, "steep blob flank is rock")
+
+
+func _test_materials_and_determinism() -> void:
+	var recipe := _small_recipe()
+	recipe.primitives.append(SiteTerrainBaker.SlopedPlane.new(30.0, 0.0, 0.0, 0.0, 0.0))
+	recipe.primitives.append(SiteTerrainBaker.Roughness.new(1933, 0.05, 0.5))
+	recipe.material_patches.append(
+		SiteTerrainBaker.MaterialPatch.new(Vector2(10.0, 10.0), 3.0, SonarMaterial.Value.ROCK)
+	)
+	var first := SiteTerrainBaker.bake(recipe)
+	var second := SiteTerrainBaker.bake(recipe)
+	_expect(first.elevations_m == second.elevations_m, "same recipe bakes identical elevations")
+	_expect(first.materials == second.materials, "same recipe bakes identical materials")
+	_expect(first.materials[first.index_of(15, 15)] == SonarMaterial.Value.ROCK, "material patch overrides the slope rule")
+	var calibration := SiteTerrainBaker.bake(VehicleTestRecipe.recipe())
+	_expect(calibration != null and calibration.validation_error().is_empty(), "calibration recipe bakes valid data")
+
+
+func _expect(condition: bool, label: String) -> void:
+	if not condition:
+		_failures.append(label)
diff --git a/tools/bake_site_terrain.gd b/tools/bake_site_terrain.gd
new file mode 100644
index 0000000..6a69b3f
--- /dev/null
+++ b/tools/bake_site_terrain.gd
@@ -0,0 +1,58 @@
+extends SceneTree
+
+const SiteTerrainBaker = preload("res://tools/site_terrain_baker.gd")
+
+const RECIPES := {
+	"vehicle_test": "res://tools/sites/vehicle_test_terrain_recipe.gd",
+	"zone1_vigilant": "res://tools/sites/zone1_vigilant_recipe.gd",
+}
+const OUTPUT_DIRECTORY := "res://content/sites"
+const PREVIEW_DIRECTORY := "res://docs/briefs/captures"
+
+
+func _init() -> void:
+	var arguments := OS.get_cmdline_user_args()
+	if arguments.is_empty() or not RECIPES.has(arguments[0]):
+		push_error("usage: -- <%s>" % " | ".join(RECIPES.keys()))
+		quit(1)
+		return
+	var name: String = arguments[0]
+	var recipe_script := load(RECIPES[name]) as GDScript
+	if recipe_script == null:
+		push_error("recipe script %s is missing" % RECIPES[name])
+		quit(1)
+		return
+	var recipe: SiteTerrainBaker.Recipe = recipe_script.recipe()
+	var data := SiteTerrainBaker.bake(recipe)
+	if data == null:
+		push_error("recipe %s did not bake valid terrain" % name)
+		quit(1)
+		return
+	DirAccess.make_dir_recursive_absolute(OUTPUT_DIRECTORY)
+	DirAccess.make_dir_recursive_absolute(PREVIEW_DIRECTORY)
+	var output_path := "%s/%s_terrain.res" % [OUTPUT_DIRECTORY, name]
+	var save_error := ResourceSaver.save(data, output_path)
+	if save_error != OK:
+		push_error("cannot save %s (%d)" % [output_path, save_error])
+		quit(1)
+		return
+	var preview_path := "%s/%s_terrain_preview.png" % [PREVIEW_DIRECTORY, name]
+	var preview_error := SiteTerrainBaker.write_preview_png(data, preview_path)
+	if preview_error != OK:
+		push_error("cannot write %s (%d)" % [preview_path, preview_error])
+		quit(1)
+		return
+	var rock_cells := 0
+	for material: int in data.materials:
+		if material == SiteTerrainBaker.SonarMaterial.Value.ROCK:
+			rock_cells += 1
+	var minimum := data.elevations_m[0]
+	var maximum := data.elevations_m[0]
+	for elevation: float in data.elevations_m:
+		minimum = minf(minimum, elevation)
+		maximum = maxf(maximum, elevation)
+	print("Baked %s: %d x %d cells, elevation %.1f .. %.1f m, rock %.0f %%" % [
+		name, data.columns, data.rows, minimum, maximum,
+		100.0 * float(rock_cells) / float(data.materials.size())
+	])
+	quit(0)
diff --git a/tools/site_terrain_baker.gd b/tools/site_terrain_baker.gd
new file mode 100644
index 0000000..4de46a9
--- /dev/null
+++ b/tools/site_terrain_baker.gd
@@ -0,0 +1,258 @@
+class_name SiteTerrainBaker
+extends RefCounted
+
+const SonarMaterial = preload("res://game/domain/sonar/sonar_material.gd")
+const SiteTerrainData = preload("res://game/domain/sites/site_terrain_data.gd")
+const TerrainHeightField = preload("res://game/domain/sites/terrain_height_field.gd")
+
+
+class Primitive extends RefCounted:
+	func elevation_delta(_x_m: float, _z_m: float) -> float:
+		return 0.0
+
+	static func distance_to_segment(point: Vector2, start: Vector2, end: Vector2) -> float:
+		var segment := end - start
+		var length_squared := segment.length_squared()
+		if length_squared == 0.0:
+			return point.distance_to(start)
+		var t := clampf((point - start).dot(segment) / length_squared, 0.0, 1.0)
+		return point.distance_to(start + segment * t)
+
+	static func end_taper(point: Vector2, start: Vector2, end: Vector2, taper_m: float) -> float:
+		if taper_m <= 0.0:
+			return 1.0
+		var segment := end - start
+		var length := segment.length()
+		if length == 0.0:
+			return 1.0
+		var along := clampf((point - start).dot(segment) / length, 0.0, length)
+		return smoothstep(0.0, taper_m, along) * smoothstep(0.0, taper_m, length - along)
+
+
+class SlopedPlane extends Primitive:
+	var depth_m: float
+	var slope_x: float
+	var slope_z: float
+	var reference_x_m: float
+	var reference_z_m: float
+
+	func _init(p_depth_m: float, p_slope_x: float, p_slope_z: float, p_reference_x_m: float, p_reference_z_m: float) -> void:
+		depth_m = p_depth_m
+		slope_x = p_slope_x
+		slope_z = p_slope_z
+		reference_x_m = p_reference_x_m
+		reference_z_m = p_reference_z_m
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		return -depth_m + slope_x * (x_m - reference_x_m) + slope_z * (z_m - reference_z_m)
+
+
+class Blob extends Primitive:
+	var centre: Vector2
+	var sigma_x_m: float
+	var sigma_z_m: float
+	var amplitude_m: float
+
+	func _init(p_centre: Vector2, p_sigma_x_m: float, p_sigma_z_m: float, p_amplitude_m: float) -> void:
+		centre = p_centre
+		sigma_x_m = p_sigma_x_m
+		sigma_z_m = p_sigma_z_m
+		amplitude_m = p_amplitude_m
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		var dx := (x_m - centre.x) / sigma_x_m
+		var dz := (z_m - centre.y) / sigma_z_m
+		return amplitude_m * exp(-(dx * dx + dz * dz))
+
+
+class Ridge extends Primitive:
+	var start: Vector2
+	var end: Vector2
+	var sigma_m: float
+	var amplitude_m: float
+	var taper_m: float
+
+	func _init(p_start: Vector2, p_end: Vector2, p_sigma_m: float, p_amplitude_m: float, p_taper_m: float) -> void:
+		start = p_start
+		end = p_end
+		sigma_m = p_sigma_m
+		amplitude_m = p_amplitude_m
+		taper_m = p_taper_m
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		var point := Vector2(x_m, z_m)
+		var distance := distance_to_segment(point, start, end)
+		var profile := exp(-pow(distance / sigma_m, 2.0))
+		return amplitude_m * profile * end_taper(point, start, end, taper_m)
+
+
+class Groove extends Primitive:
+	var start: Vector2
+	var end: Vector2
+	var half_width_m: float
+	var depth_m: float
+	var wall_softness_m: float
+
+	func _init(p_start: Vector2, p_end: Vector2, p_half_width_m: float, p_depth_m: float, p_wall_softness_m: float) -> void:
+		start = p_start
+		end = p_end
+		half_width_m = p_half_width_m
+		depth_m = p_depth_m
+		wall_softness_m = p_wall_softness_m
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		var point := Vector2(x_m, z_m)
+		var distance := distance_to_segment(point, start, end)
+		var inside := 1.0 - smoothstep(
+			half_width_m - wall_softness_m,
+			half_width_m + wall_softness_m,
+			distance
+		)
+		return -depth_m * inside * end_taper(point, start, end, half_width_m)
+
+
+class Step extends Primitive:
+	var point: Vector2
+	var normal: Vector2
+	var drop_m: float
+	var softness_m: float
+	var slope_beyond: float
+
+	func _init(p_point: Vector2, p_normal: Vector2, p_drop_m: float, p_softness_m: float, p_slope_beyond: float) -> void:
+		point = p_point
+		normal = p_normal.normalized()
+		drop_m = p_drop_m
+		softness_m = p_softness_m
+		slope_beyond = p_slope_beyond
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		var signed_distance := (Vector2(x_m, z_m) - point).dot(normal)
+		var step := drop_m * smoothstep(-softness_m, softness_m, signed_distance)
+		var slope := maxf(signed_distance - softness_m, 0.0) * slope_beyond
+		return -(step + slope)
+
+
+class Ripples extends Primitive:
+	var direction: Vector2
+	var wavelength_m: float
+	var amplitude_m: float
+	var centre: Vector2
+	var radius_m: float
+
+	func _init(p_direction: Vector2, p_wavelength_m: float, p_amplitude_m: float, p_centre: Vector2, p_radius_m: float) -> void:
+		direction = p_direction.normalized()
+		wavelength_m = p_wavelength_m
+		amplitude_m = p_amplitude_m
+		centre = p_centre
+		radius_m = p_radius_m
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		var point := Vector2(x_m, z_m)
+		var phase := point.dot(direction) * TAU / wavelength_m
+		var falloff := 1.0
+		if radius_m > 0.0:
+			falloff = 1.0 - smoothstep(radius_m * 0.6, radius_m, point.distance_to(centre))
+		return amplitude_m * sin(phase) * falloff
+
+
+class Roughness extends Primitive:
+	var amplitude_m: float
+	var _noise: FastNoiseLite
+
+	func _init(p_seed: int, p_frequency: float, p_amplitude_m: float) -> void:
+		amplitude_m = p_amplitude_m
+		_noise = FastNoiseLite.new()
+		_noise.noise_type = FastNoiseLite.TYPE_SIMPLEX_SMOOTH
+		_noise.seed = p_seed
+		_noise.frequency = p_frequency
+		_noise.fractal_type = FastNoiseLite.FRACTAL_FBM
+		_noise.fractal_octaves = 3
+
+	func elevation_delta(x_m: float, z_m: float) -> float:
+		return _noise.get_noise_2d(x_m, z_m) * amplitude_m
+
+
+class MaterialPatch extends RefCounted:
+	var centre: Vector2
+	var radius_m: float
+	var material: int
+
+	func _init(p_centre: Vector2, p_radius_m: float, p_material: int) -> void:
+		centre = p_centre
+		radius_m = p_radius_m
+		material = p_material
+
+
+class Recipe extends RefCounted:
+	var columns: int = 2
+	var rows: int = 2
+	var cell_size_m: float = 1.0
+	var origin_x_m: float = 0.0
+	var origin_z_m: float = 0.0
+	var floor_elevation_m: float = -1000.0
+	var rock_slope_degrees: float = 20.0
+	var rock_reflectivity: float = 0.72
+	var sand_reflectivity: float = 0.45
+	var primitives: Array[Primitive] = []
+	var material_patches: Array[MaterialPatch] = []
+
+
+static func bake(recipe: Recipe) -> SiteTerrainData:
+	var data := SiteTerrainData.new()
+	data.columns = recipe.columns
+	data.rows = recipe.rows
+	data.cell_size_m = recipe.cell_size_m
+	data.origin_x_m = recipe.origin_x_m
+	data.origin_z_m = recipe.origin_z_m
+	data.rock_reflectivity = recipe.rock_reflectivity
+	data.sand_reflectivity = recipe.sand_reflectivity
+	var cell_count := recipe.columns * recipe.rows
+	# Packed arrays are passed by value in GDScript: fill locals, assign once.
+	var elevations := PackedFloat32Array()
+	var materials := PackedByteArray()
+	elevations.resize(cell_count)
+	materials.resize(cell_count)
+	for row in recipe.rows:
+		var z_m := recipe.origin_z_m + float(row) * recipe.cell_size_m
+		for column in recipe.columns:
+			var x_m := recipe.origin_x_m + float(column) * recipe.cell_size_m
+			var elevation := 0.0
+			for primitive: Primitive in recipe.primitives:
+				elevation += primitive.elevation_delta(x_m, z_m)
+			elevations[data.index_of(column, row)] = maxf(elevation, recipe.floor_elevation_m)
+			materials[data.index_of(column, row)] = SonarMaterial.Value.SAND
+	data.elevations_m = elevations
+	data.materials = materials
+	var field := TerrainHeightField.from_data(data)
+	if field == null:
+		return null
+	var rock_cosine := cos(deg_to_rad(recipe.rock_slope_degrees))
+	for row in recipe.rows:
+		for column in recipe.columns:
+			if field.normal_at_cell(column, row).y < rock_cosine:
+				materials[data.index_of(column, row)] = SonarMaterial.Value.ROCK
+	for patch: MaterialPatch in recipe.material_patches:
+		for row in recipe.rows:
+			var z_m := recipe.origin_z_m + float(row) * recipe.cell_size_m
+			for column in recipe.columns:
+				var x_m := recipe.origin_x_m + float(column) * recipe.cell_size_m
+				if Vector2(x_m, z_m).distance_to(patch.centre) <= patch.radius_m:
+					materials[data.index_of(column, row)] = patch.material
+	data.materials = materials
+	return data
+
+
+static func write_preview_png(data: SiteTerrainData, path: String) -> Error:
+	var field := TerrainHeightField.from_data(data)
+	if field == null:
+		return ERR_INVALID_DATA
+	var image := Image.create(data.columns, data.rows, false, Image.FORMAT_RGB8)
+	var span := maxf(field.maximum_elevation_m() - field.minimum_elevation_m(), 0.001)
+	for row in data.rows:
+		for column in data.columns:
+			var ratio := (field.elevation_at_cell(column, row) - field.minimum_elevation_m()) / span
+			var color := Color(ratio, ratio, ratio)
+			if field.material_at_cell(column, row) == SonarMaterial.Value.ROCK:
+				color.r = minf(color.r + 0.16, 1.0)
+			image.set_pixel(column, row, color)
+	return image.save_png(path)
diff --git a/tools/sites/vehicle_test_terrain_recipe.gd b/tools/sites/vehicle_test_terrain_recipe.gd
new file mode 100644
index 0000000..b5baf29
--- /dev/null
+++ b/tools/sites/vehicle_test_terrain_recipe.gd
@@ -0,0 +1,25 @@
+class_name VehicleTestTerrainRecipe
+extends RefCounted
+
+const SiteTerrainBaker = preload("res://tools/site_terrain_baker.gd")
+
+
+static func recipe() -> SiteTerrainBaker.Recipe:
+	var result := SiteTerrainBaker.Recipe.new()
+	result.columns = 61
+	result.rows = 69
+	result.cell_size_m = 3.0
+	result.origin_x_m = -90.0
+	result.origin_z_m = -176.0
+	result.floor_elevation_m = -95.0
+	result.rock_slope_degrees = 20.0
+	result.primitives = [
+		SiteTerrainBaker.SlopedPlane.new(40.0, 0.0, 0.19, 0.0, 28.0),
+		SiteTerrainBaker.Blob.new(Vector2(-24.0, -48.0), sqrt(210.0), sqrt(980.0), 13.0),
+		SiteTerrainBaker.Blob.new(Vector2(25.0, -58.0), sqrt(250.0), sqrt(1150.0), 15.0),
+		SiteTerrainBaker.Blob.new(Vector2(0.0, -66.0), sqrt(120.0), sqrt(2500.0), -8.5),
+		SiteTerrainBaker.Blob.new(Vector2(-5.0, -125.0), sqrt(900.0), sqrt(620.0), 8.0),
+		SiteTerrainBaker.Ripples.new(Vector2(1.0, 0.0), TAU / 0.075, 0.9, Vector2.ZERO, 0.0),
+		SiteTerrainBaker.Ripples.new(Vector2(0.0, 1.0), TAU / 0.048, 0.9, Vector2.ZERO, 0.0),
+	]
+	return result