WIP: feat(scene) initial beauty baseline — terrain textures, sky, foam, mist, foliage, shadows

- Add 3 Terrain3D texture assets (limestone, valley grass, warm soil)
- Sculpt initial Terrain3D heightmap with ridge, valley, waterfall drop
- Replace plain water with emissive-tinged material
- Add foam mesh, mist spheres, and procedural sky with valley fog
- Add 10 StylizedTree instances around village perimeter
- Enable directional light shadows with extended cascade range
- Add tree height snapping to terrain surface
- Add refined scaffold tests for material count, terrain height, foliage, sky, fog
- Add terrain texture PNGs and StylizedTree.tscn scene
- Add generate_jajce_terrain.gd tool

tools/generate_jajce_terrain.gd

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+extends SceneTree
+
+const MAP_SIZE := 512
+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"
+
+func _initialize() -> void:
+	call_deferred("_generate")
+
+func _generate() -> void:
+	DirAccess.make_dir_recursive_absolute(
+		ProjectSettings.globalize_path(TEXTURE_DIRECTORY)
+	)
+	_generate_texture("grass_albedo.png", Color("#516f36"), Color("#79924c"), 17)
+	_generate_texture("soil_albedo.png", Color("#65513b"), Color("#92734d"), 29)
+	_generate_texture("rock_albedo.png", Color("#55534f"), Color("#89847b"), 43)
+
+	var terrain := Terrain3D.new()
+	terrain.region_size = 256
+	root.add_child(terrain)
+	await process_frame
+
+	var height_map := Image.create_empty(
+		MAP_SIZE,
+		MAP_SIZE,
+		false,
+		Image.FORMAT_RF
+	)
+	var noise := FastNoiseLite.new()
+	noise.seed = 1943
+	noise.frequency = 0.018
+	noise.fractal_octaves = 4
+	noise.fractal_gain = 0.45
+
+	for image_z in MAP_SIZE:
+		for image_x in MAP_SIZE:
+			var world_x := float(image_x - HALF_SIZE)
+			var world_z := float(image_z - HALF_SIZE)
+			var distance := Vector2(world_x, world_z).length()
+			var outside_play_area := smoothstep(20.0, 52.0, distance)
+			var ridge := 28.0 * _elliptical_peak(
+				world_x,
+				world_z,
+				-72.0,
+				18.0,
+				72.0,
+				48.0
+			)
+			var eastern_hill := 15.0 * _elliptical_peak(
+				world_x,
+				world_z,
+				105.0,
+				65.0,
+				110.0,
+				90.0
+			)
+			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
+			) * outside_play_area
+			height_map.set_pixel(
+				image_x,
+				image_z,
+				Color(height / HEIGHT_SCALE, 0.0, 0.0, 1.0)
+			)
+
+	terrain.data.import_images(
+		[height_map, null, null],
+		Vector3(-HALF_SIZE, 0.0, -HALF_SIZE),
+		0.0,
+		HEIGHT_SCALE
+	)
+	terrain.data.save_directory(DATA_DIRECTORY)
+	print("[TerrainGenerator] Generated bounded Jajce terrain and textures")
+	quit(0)
+
+func _elliptical_peak(
+	x: float,
+	z: float,
+	center_x: float,
+	center_z: float,
+	width: float,
+	depth: float
+) -> float:
+	return exp(
+		-(
+			pow((x - center_x) / width, 2.0)
+			+ pow((z - center_z) / depth, 2.0)
+		)
+	)
+
+func _generate_texture(
+	file_name: String,
+	dark_color: Color,
+	light_color: Color,
+	seed_value: int
+) -> void:
+	var noise := FastNoiseLite.new()
+	noise.seed = seed_value
+	noise.frequency = 0.035
+	noise.fractal_octaves = 3
+	var image := Image.create_empty(256, 256, false, Image.FORMAT_RGBA8)
+	for y in image.get_height():
+		for x in image.get_width():
+			var value := noise.get_noise_2d(x, y) * 0.5 + 0.5
+			var color := dark_color.lerp(light_color, value)
+			color.a = value
+			image.set_pixel(x, y, color)
+	image.generate_mipmaps()
+	var path := TEXTURE_DIRECTORY.path_join(file_name)
+	var error := image.save_png(path)
+	if error != OK:
+		push_error("Could not write terrain texture: " + path)

tools/generate_jajce_terrain.gd.uid

@@ -0,0 +1 @@
+uid://cvcgl6q54kq2v