feat: add Jajce world scaffold

tools/generate_jajce_terrain_seed.gd

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+extends SceneTree
+
+const REGION_SIZE := 256
+const TERRAIN_SIZE := 512
+const DATA_DIRECTORY := "res://terrain/jajce/data"
+
+func _initialize() -> void:
+	call_deferred("_run")
+
+func _run() -> void:
+	var camera := Camera3D.new()
+	camera.current = true
+	root.add_child(camera)
+
+	var terrain := Terrain3D.new()
+	terrain.region_size = REGION_SIZE
+	root.add_child(terrain)
+	terrain.set_camera(camera)
+	await process_frame
+
+	var height_map := Image.create_empty(
+		TERRAIN_SIZE,
+		TERRAIN_SIZE,
+		false,
+		Image.FORMAT_RF
+	)
+	height_map.fill(Color(0.0, 0.0, 0.0, 1.0))
+
+	var images: Array[Image]
+	images.resize(Terrain3DRegion.TYPE_MAX)
+	images[Terrain3DRegion.TYPE_HEIGHT] = height_map
+
+	terrain.data.import_images(
+		images,
+		Vector3(-TERRAIN_SIZE / 2.0, 0.0, -TERRAIN_SIZE / 2.0),
+		0.0,
+		1.0
+	)
+	terrain.data.save_directory(DATA_DIRECTORY)
+	print("[TOOL] Generated flat Jajce Terrain3D seed data in ", DATA_DIRECTORY)
+	quit(0)

tools/generate_jajce_terrain_seed.gd.uid

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+uid://cbpngrlbf6fia