generate entities on biome

Reviewed-on: #18

.idea/.gitignore

@@ -0,0 +1,13 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Rider ignored files
+/contentModel.xml
+/modules.xml
+/projectSettingsUpdater.xml
+/.idea.tgcc.iml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/encodings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
+</project>

.idea/indexLayout.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="UserContentModel">
+    <attachedFolders />
+    <explicitIncludes />
+    <explicitExcludes />
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

core/ai/agents/base/ai_base.gd

@@ -0,0 +1,58 @@
+extends CharacterBody3D
+
+class_name AIBase
+
+@export_group("Movement")
+@export var speed: float = 4.0
+var _enable_state_machine: bool = true
+@export var enable_state_machine: bool: 
+	set(value):
+		_enable_state_machine = value
+		toggle_enable_state_machine()
+	get:
+		return _enable_state_machine
+
+@onready var patrol_radius_shape: CollisionShape3D = $%PatrolRadiusShape
+@onready var nav_agent: NavigationAgent3D = $%NavigationAgent3D
+@onready var state_machine: StateMachine = $%StateMachine
+
+@export_group("Entities")
+enum EntityType { HUMANOID, ANIMAL }
+@export var entity_type: EntityType = EntityType.HUMANOID
+@export var entity_name: String = ""
+@export var allowed_biomes: Array[String] = []
+@export_range(0.0, 100.0, 0.1) var spawn_uniqueness: float = 1.0
+
+
+func _ready() -> void:
+	randomize()
+	toggle_enable_state_machine()
+
+func toggle_enable_state_machine() -> void:
+	state_machine.enable = _enable_state_machine
+
+func _physics_process(delta: float) -> void:
+	if !_enable_state_machine:
+		return
+
+	state_machine.physics_process(delta)
+
+	if nav_agent.is_navigation_finished():
+		velocity = Vector3.ZERO
+		move_and_slide()
+		return
+
+	var next_point = nav_agent.get_next_path_position()
+	var direction = global_position.direction_to(next_point)
+	
+	velocity.x = direction.x * speed
+	velocity.z = direction.z * speed
+	
+	move_and_slide()
+
+func navigate_to_random_point() -> void:
+	var nav_map_rid = get_world_3d().get_navigation_map()
+	var patrol_radius = patrol_radius_shape.shape.radius
+	var target_point_in_space = global_position + Vector3(randf_range(-1, 1), 0, randf_range(-1, 1)).normalized() * randf_range(0, patrol_radius)
+	var closest_valid_point = NavigationServer3D.map_get_closest_point(nav_map_rid, target_point_in_space)
+	nav_agent.target_position = closest_valid_point

core/ai/agents/base/ai_base.gd.uid

@@ -0,0 +1 @@
+uid://b30p1yqojbbbk

core/ai/agents/base/ai_base.tscn

@@ -0,0 +1,45 @@
+[gd_scene format=3 uid="uid://clx701xdwelgx"]
+
+[ext_resource type="Script" uid="uid://b30p1yqojbbbk" path="res://core/ai/agents/base/ai_base.gd" id="1_4d1nn"]
+[ext_resource type="Script" uid="uid://ps3vlu2qvmop" path="res://core/ai/framework/state_machine.gd" id="2_q1hg3"]
+[ext_resource type="Script" uid="uid://nga8qx56iwgu" path="res://core/ai/agents/base/idle_state.gd" id="3_26faq"]
+[ext_resource type="Script" uid="uid://bngfthvt04ivv" path="res://core/ai/agents/base/patrol_state.gd" id="4_lim44"]
+
+[sub_resource type="CapsuleMesh" id="CapsuleMesh_mh3lg"]
+
+[sub_resource type="CapsuleShape3D" id="CapsuleShape3D_mh3lg"]
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_lim44"]
+radius = 20.0
+
+[node name="AiBase" type="CharacterBody3D" unique_id=1228675528]
+script = ExtResource("1_4d1nn")
+entity_name = "Humanoid"
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="." unique_id=214482161]
+mesh = SubResource("CapsuleMesh_mh3lg")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="." unique_id=92811823]
+shape = SubResource("CapsuleShape3D_mh3lg")
+
+[node name="NavigationAgent3D" type="NavigationAgent3D" parent="." unique_id=1370024449]
+unique_name_in_owner = true
+
+[node name="StateMachine" type="Node" parent="." unique_id=1286404264 node_paths=PackedStringArray("initial_state")]
+unique_name_in_owner = true
+script = ExtResource("2_q1hg3")
+initial_state = NodePath("IdleState")
+
+[node name="IdleState" type="Node" parent="StateMachine" unique_id=763668255]
+script = ExtResource("3_26faq")
+state_id = &"idle"
+
+[node name="PatrolState" type="Node" parent="StateMachine" unique_id=2054606629]
+script = ExtResource("4_lim44")
+state_id = &"patrol"
+
+[node name="PatrolRadiusShape" type="CollisionShape3D" parent="." unique_id=1379515938]
+unique_name_in_owner = true
+shape = SubResource("SphereShape3D_lim44")
+disabled = true
+debug_color = Color(1, 1, 0, 1)

core/ai/agents/base/idle_state.gd

@@ -0,0 +1,26 @@
+extends State
+
+const PATROL_STATE_ID: StringName = &"patrol"
+
+@export var wait_time: float = 3.0
+
+var runtime_timer: Timer
+
+func enter() -> void:
+	runtime_timer = Timer.new()
+	runtime_timer.name = "IdleTimer"
+	add_child(runtime_timer)
+	runtime_timer.one_shot = true
+	runtime_timer.timeout.connect(_on_timer_timeout)
+	runtime_timer.start(wait_time)
+
+func exit() -> void:
+	if runtime_timer:
+		if runtime_timer.is_connected("timeout", _on_timer_timeout):
+			runtime_timer.timeout.disconnect(_on_timer_timeout)
+		
+		runtime_timer.queue_free()
+		runtime_timer = null
+
+func _on_timer_timeout() -> void:
+	transitioned.emit(self, PATROL_STATE_ID)

core/ai/agents/base/idle_state.gd.uid

@@ -0,0 +1 @@
+uid://nga8qx56iwgu

core/ai/agents/base/patrol_state.gd

@@ -0,0 +1,12 @@
+extends State
+
+const IDLE_STATE_ID: StringName = &"idle"
+
+@onready var agent: AIBase = owner
+
+func enter() -> void:
+	agent.navigate_to_random_point()
+
+func physics_update(_delta)  -> void:
+	if agent.nav_agent.is_navigation_finished():
+		transitioned.emit(self, IDLE_STATE_ID)

core/ai/agents/base/patrol_state.gd.uid

@@ -0,0 +1 @@
+uid://bngfthvt04ivv

core/ai/framework/state.gd

@@ -0,0 +1,20 @@
+extends Node
+
+class_name State
+
+@export var state_id: StringName = &""
+
+@warning_ignore("unused_signal")
+signal transitioned(state: State, new_state_id: StringName)
+
+func enter()  -> void:
+	pass
+
+func exit()  -> void:
+	pass
+
+func update(_delta)  -> void:
+	pass
+
+func physics_update(_delta)  -> void:
+	pass

core/ai/framework/state.gd.uid

@@ -0,0 +1 @@
+uid://dpso7abi5ftyw

core/ai/framework/state_machine.gd

@@ -0,0 +1,61 @@
+extends Node
+
+class_name StateMachine
+
+@export var initial_state: State
+
+var current_state: State
+var states: Dictionary[StringName, State] = {}
+var is_initialized: bool = false
+var _enabled: bool = true
+var enable: bool:
+	set(value):
+		_enabled = value
+		_set_enabled(value)
+	get:
+		return _enabled
+
+func _ready() -> void:
+	_initialize_states()
+	_set_enabled(enable)
+
+func _initialize_states() -> void:
+	if is_initialized:
+		return
+
+	for state in get_children():
+		if state is State:
+			states[state.state_id] = state
+			state.transitioned.connect(_on_state_transition)
+
+	is_initialized = true
+
+func _set_enabled(value: bool) -> void:
+	_enabled = value
+
+	if not _enabled:
+		return
+
+	_initialize_states()
+
+	if initial_state and current_state == null:
+		current_state = initial_state
+		current_state.enter()
+
+func physics_process(delta) -> void:
+	if current_state and _enabled:
+		current_state.physics_update(delta)
+
+func _on_state_transition(state: State, new_state_id: StringName) -> void:
+	if state != current_state:
+		return
+
+	var new_state = states.get(new_state_id)
+	if not new_state:
+		return
+
+	if current_state:
+		current_state.exit()
+	
+	current_state = new_state
+	current_state.enter()

core/ai/framework/state_machine.gd.uid

@@ -0,0 +1 @@
+uid://ps3vlu2qvmop

core/audio/audio_manager.gd

@@ -0,0 +1,31 @@
+extends Node
+
+const MIN_VOLUME: float = 0.0
+const MAX_VOLUME: float = 1.0
+
+func _ready() -> void:
+	load_save_data()
+
+func load_save_data() -> void:
+	for bus_name in GameState.save_data.audio_bus_volumes:
+		_apply_audio_bus_volume(bus_name, GameState.save_data.audio_bus_volumes[bus_name])
+
+func set_audio_bus_volume(bus_name: StringName, linear_value: float) -> void:
+	var normalized_bus_name := str(bus_name)
+	var clamped_value := clampf(linear_value, MIN_VOLUME, MAX_VOLUME)
+
+	GameState.save_data.audio_bus_volumes[normalized_bus_name] = clamped_value
+	_apply_audio_bus_volume(normalized_bus_name, clamped_value)
+	GameState.save_game()
+
+func get_audio_bus_volume(bus_name: StringName, default_value: float = 1.0) -> float:
+	return float(GameState.save_data.audio_bus_volumes.get(str(bus_name), default_value))
+
+func _apply_audio_bus_volume(bus_name: String, linear_value: float) -> void:
+	var bus_index := AudioServer.get_bus_index(bus_name)
+	if bus_index == -1:
+		return
+
+	var clamped_value := clampf(linear_value, MIN_VOLUME, MAX_VOLUME)
+	AudioServer.set_bus_volume_db(bus_index, linear_to_db(clamped_value))
+	AudioServer.set_bus_mute(bus_index, is_zero_approx(clamped_value))

core/audio/audio_manager.gd.uid

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

core/biome_generator/biome_generator.gd

@@ -1,42 +1,81 @@
 extends Node3D
 
+#constants about biome, pieces and entity spawn
 const CHUNK_TYPE_BIOME: int = 0
 const CHUNK_TYPE_STRAIGHT_TRACK: int = 1
 const CHUNK_TYPE_CURVED_TRACK: int = 2
+const ENTITY_TYPE_HUMANOID: int = 0
+const ENTITY_TYPE_ANIMAL: int = 1
+const ENTITY_SPAWN_ANY: int = 0
+const ENTITY_SPAWN_HUMANOID_ONLY: int = 1
+const ENTITY_SPAWN_ANIMAL_ONLY: int = 2
 
-const CHUNK_GENERATION_STEPS_PER_FRAME: int = 2
-const CHUNK_CLEANUP_STEPS_PER_FRAME: int = 4
-const LAMPPOST_WIRE_STEPS_PER_FRAME: int = 1
-const RAILWAY_SCENE_DIRECTORY: String = "res://tgcc/chunk/railway/scene"
+const CHUNK_GENERATION_FRAME_BUDGET_USEC: int = 2000 #2 ms/frame to generate chunks
+const CHUNK_CLEANUP_FRAME_BUDGET_USEC: int = 1000 #1 ms/frame per cleanup
+const LAMPPOST_WIRE_FRAME_BUDGET_USEC: int = 1000 #1 ms/frame per i fili dei lampioni
+#(about 4 ms o work for frame)
+#Se compaiono chunk troppo lentamente davanti al treno:
+#aumentare generazione a 3000 o 4000
+#Se ci sono micro-scatti:
+#abbassare generazione a 1000 o 1500
+#Se i fili appaiono in ritardo:
+#aumentare wire a 1500 o 2000
+#Se il cleanup causa scatti:
+#abbassare cleanup a 500
+
+const MAX_CHUNK_UNIQUENESS: int = 5
+const RIVER_SIDE_ORDER: Array[String] = ["north", "est", "south", "west"]
+const RIVER_DIRECTIONS: Dictionary = {
+	"north": Vector2(0.0, -1.0),
+	"est": Vector2(1.0, 0.0),
+	"south": Vector2(0.0, 1.0),
+	"west": Vector2(-1.0, 0.0),
+}
+const RIVER_NEIGHBOUR_OFFSETS: Dictionary = {
+	"north": Vector2i(0, -1),
+	"est": Vector2i(1, 0),
+	"south": Vector2i(0, 1),
+	"west": Vector2i(-1, 0),
+}
 
 @export_group("Rails")
-@export var rail_path: Path3D 
+@export var rail_path: Path3D #rail path
+@export var railway_pool: Resource
 
 @export_group("Biomes")
-@export var biome_list: Array[Biome]
+@export var biome_list: Array[Biome] #list of scenes for the biome
+
+@export_group("Entities")
+@export var entity_pool: Resource
+@export_range(0.0, 1.0, 0.01) var entity_spawn_probability: float = 0.6
+@export_range(0, 20, 1) var max_entities_per_chunk: int = 3
 
 @export_group("Grid and Area")
-@export var chunk_size: float = 20.0
-@export var eye_line: int = 3 
-@export var district_scale: float = 0.05 
+@export var chunk_size: float = 20.0	#size of a cell; default 20 (global position is defined dividing x and z for this value) 
+@export var eye_line: int = 3 #cells to be considerated around the train (e.g. 3 => a square of cells from -3 to 3 around train cell)
+@export var district_scale: float = 0.05 #noise value to distribuite biome; low values create large area, high values create biome with more variants
 
 @export_group("Lamppost")
 @export var lamppost_wire_material: ShaderMaterial 
 @export_range(0.01, 1.0) var wire_thickness: float = 0.05
-@export var lamppost_dist_factor: int = 10
+@export var lamppost_dist_factor: int = 10 #max distance of connections
 
 var board: Dictionary = {}
 var last_pos_train: Vector2i = Vector2i(999999, 999999) 
 var noise_generator: FastNoiseLite 
 var altitude_generator: FastNoiseLite
 var wire_connections: Dictionary = {}
-var chunk_candidate_cache: Dictionary = {}
+var chunk_candidate_cache: Dictionary = {} #node cache (metadata)
+var prop_candidate_cache: Dictionary = {}
+var entity_candidate_cache: Dictionary = {}
 var pending_generation_cells: Array[Vector2i] = []
 var pending_cleanup_cells: Array[Vector2i] = []
 var pending_wire_cells: Array[Vector2i] = []
+var pending_generation_cursor: int = 0
+var pending_cleanup_cursor: int = 0
+var pending_wire_cursor: int = 0
 var pending_wire_lookup: Dictionary = {}
-var pending_radar_update: bool = false
-var rail_chunk_catalogue: Dictionary = {}
+var rail_chunk_catalogue: Dictionary = {} #rails chunk list
 
 var manual_biome: Biome = null
 
@@ -45,7 +84,8 @@ func _ready() -> void:
 
 	#connect events
 	UIEvents.update_rail_chunks.connect(_update_rail_chunks)
-		
+	
+	#noise generator for biome and altitute
 	noise_generator = FastNoiseLite.new()
 	noise_generator.noise_type = FastNoiseLite.TYPE_PERLIN
 	noise_generator.seed = randi() 
@@ -56,8 +96,11 @@ func _ready() -> void:
 	altitude_generator.seed = randi() 
 	altitude_generator.frequency = district_scale * 0.5 
 	
+	#fill cache with available chunk
 	_warm_chunk_candidate_cache()
+	_warm_entity_candidate_cache()
 	_warm_rail_chunk_catalogue()
+	#set unique pieces
 	_update_set_pieces()
 
 func _update_set_pieces() -> void:
@@ -72,7 +115,7 @@ func _update_set_pieces() -> void:
 
 		var local_biome = ""
 		if manual_biome != null:
-			local_biome = manual_biome.nome
+			local_biome = manual_biome.name
 		else:
 			var grid_x = roundi(sp.global_position.x / chunk_size)
 			var grid_z = roundi(sp.global_position.z / chunk_size)
@@ -90,6 +133,7 @@ func _update_set_pieces() -> void:
 	
 func _destroy_and_regenrate_world() -> void:
 	_warm_chunk_candidate_cache()
+	_warm_entity_candidate_cache()
 	_clear_pending_world_work()
 
 	#Turn off old temples
@@ -98,7 +142,7 @@ func _destroy_and_regenrate_world() -> void:
 	#Destroy all models
 	for pos in board.keys():
 		var cella = board[pos]
-		if cella["type"] != "obstacle":
+		if not _is_persistent_obstacle(cella):
 			if cella.has("node") and is_instance_valid(cella["node"]):
 				cella["node"].queue_free()
 				
@@ -112,16 +156,13 @@ func _destroy_and_regenrate_world() -> void:
 		var train_pos = rail_path.train_instance.global_position
 		var current_pos = Vector2i(roundi(train_pos.x / chunk_size), roundi(train_pos.z / chunk_size))
 		_refresh_world(current_pos)
-		pending_radar_update = true
 
 func _process(_delta: float) -> void:
+	#based on time budgets the queues are evaluated by frame and not all together
 	_drain_cleanup_queue()
 	_drain_generation_queue()
 	_drain_wire_queue()
 
-	if pending_radar_update:
-		pending_radar_update = false
-
 func _physics_process(_delta: float) -> void:
 	if rail_path == null or rail_path.train_instance == null: return
 		
@@ -133,7 +174,6 @@ func _physics_process(_delta: float) -> void:
 	if current_pos != last_pos_train:
 		last_pos_train = current_pos
 		_refresh_world(current_pos)
-		pending_radar_update = true
 
 func collect_all_chunkinfo(root: Node, list: Array[Node]) -> void:
 	if root == null: return
@@ -144,6 +184,33 @@ func collect_all_chunkinfo(root: Node, list: Array[Node]) -> void:
 	for child in root.get_children():
 		collect_all_chunkinfo(child, list)
 
+func collect_all_propinfo(root: Node, list: Array[Node]) -> void:
+	if root == null: return
+
+	if "available_props" in root:
+		list.append(root)
+
+	for child in root.get_children():
+		collect_all_propinfo(child, list)
+
+func collect_all_entityinfo(root: Node, list: Array[Node]) -> void:
+	if root == null: return
+
+	if "entity_type" in root:
+		list.append(root)
+
+	for child in root.get_children():
+		collect_all_entityinfo(child, list)
+
+func collect_all_entity_spawn_points(root: Node, list: Array[Node]) -> void:
+	if root == null: return
+
+	if "allowed_type" in root or root.is_in_group("entity_spawn_point"):
+		list.append(root)
+
+	for child in root.get_children():
+		collect_all_entity_spawn_points(child, list)
+
 func _warm_chunk_candidate_cache() -> void:
 	var unique_scenes: Dictionary = {}
 
@@ -164,27 +231,30 @@ func _warm_chunk_candidate_cache() -> void:
 	for scene in unique_scenes.values():
 		_get_chunk_scene_metadata(scene)
 
-func _warm_rail_chunk_catalogue() -> void:
-	rail_chunk_catalogue.clear()
-
-	var directory := DirAccess.open(RAILWAY_SCENE_DIRECTORY)
-	if directory == null:
+func _warm_entity_candidate_cache() -> void:
+	entity_candidate_cache.clear()
+	if entity_pool == null or not "available_entities" in entity_pool:
 		return
 
-	directory.list_dir_begin()
-	var file_name := directory.get_next()
-	while file_name != "":
-		if not directory.current_is_dir() and file_name.ends_with(".tscn"):
-			var scene_path := "%s/%s" % [RAILWAY_SCENE_DIRECTORY, file_name]
-			var scene := load(scene_path) as PackedScene
-			if scene != null:
-				var chunk_type = _get_chunk_type_from_scene(scene)
-				if chunk_type == CHUNK_TYPE_STRAIGHT_TRACK or chunk_type == CHUNK_TYPE_CURVED_TRACK:
-					if not rail_chunk_catalogue.has(chunk_type):
-						rail_chunk_catalogue[chunk_type] = []
-					rail_chunk_catalogue[chunk_type].append(scene)
-		file_name = directory.get_next()
-	directory.list_dir_end()
+	for scene in entity_pool.available_entities:
+		if scene == null:
+			continue
+		_get_entity_scene_metadata(scene)
+
+func _warm_rail_chunk_catalogue() -> void:
+	rail_chunk_catalogue.clear()
+	if railway_pool == null or not "available_railways" in railway_pool:
+		return
+
+	for scene in railway_pool.available_railways:
+		if scene == null:
+			continue
+
+		var chunk_type = _get_chunk_type_from_scene(scene)
+		if chunk_type == CHUNK_TYPE_STRAIGHT_TRACK or chunk_type == CHUNK_TYPE_CURVED_TRACK:
+			if not rail_chunk_catalogue.has(chunk_type):
+				rail_chunk_catalogue[chunk_type] = []
+			rail_chunk_catalogue[chunk_type].append(scene)
 
 func _get_chunk_scene_cache_key(scene: PackedScene) -> String:
 	if scene == null:
@@ -226,6 +296,7 @@ func _get_chunk_scene_metadata(scene: PackedScene) -> Dictionary:
 		"info_path": info_path,
 		"rotations": rotations,
 		"has_lamppost": "have_lamppost" in info_node and info_node.have_lamppost,
+		"uniqueness": _get_chunk_uniqueness_from_info(info_node),
 	}
 	preview_chunk.queue_free()
 	chunk_candidate_cache[key] = metadata
@@ -259,8 +330,10 @@ func _clear_pending_world_work() -> void:
 	pending_generation_cells.clear()
 	pending_cleanup_cells.clear()
 	pending_wire_cells.clear()
+	pending_generation_cursor = 0
+	pending_cleanup_cursor = 0
+	pending_wire_cursor = 0
 	pending_wire_lookup.clear()
-	pending_radar_update = false
 
 func _collect_replaceable_rail_chunks(root: Node, result: Array[Node3D]) -> void:
 	if root == null:
@@ -268,7 +341,7 @@ func _collect_replaceable_rail_chunks(root: Node, result: Array[Node3D]) -> void
 
 	if root is Node3D:
 		var node_3d := root as Node3D
-		if node_3d.scene_file_path.begins_with(RAILWAY_SCENE_DIRECTORY):
+		if _is_railway_scene_registered(node_3d.scene_file_path):
 			var info_list: Array[Node] = []
 			collect_all_chunkinfo(node_3d, info_list)
 			var info_node = info_list[0] if info_list.size() > 0 else null
@@ -281,6 +354,17 @@ func _collect_replaceable_rail_chunks(root: Node, result: Array[Node3D]) -> void
 	for child in root.get_children():
 		_collect_replaceable_rail_chunks(child, result)
 
+func _is_railway_scene_registered(scene_path: String) -> bool:
+	if scene_path == "":
+		return false
+
+	for candidates in rail_chunk_catalogue.values():
+		for candidate in candidates:
+			var scene := candidate as PackedScene
+			if scene != null and scene.resource_path == scene_path:
+				return true
+	return false
+
 func _pick_replacement_rail_scene(chunk_type: int, current_scene_path: String) -> PackedScene:
 	var candidates: Array = rail_chunk_catalogue.get(chunk_type, [])
 	if candidates.is_empty():
@@ -327,6 +411,8 @@ func _replace_rail_chunk_instance(chunk_root: Node3D) -> bool:
 	chunk_root.queue_free()
 	return true
 
+#rebuild the scene catalogue from railway_pool,
+#than serach on the current scene which chunks can be changed and for each one chose a new scene (the same kind)
 func _refresh_rail_chunks() -> void:
 	print("update rail chunks")
 	_warm_rail_chunk_catalogue()
@@ -354,8 +440,12 @@ func _refresh_world(center: Vector2i) -> void:
 	_rebuild_generation_queue(center)
 	_rebuild_cleanup_queue(center)
 
+#check cells around the train by rings:
+#first the center, then borders with distance = 1, the distance = 2 and so to eye_line.
+#Use maxi(abs(x), abs(z)) to know the border of the ring. Cells closest to the train have more priority
 func _rebuild_generation_queue(center: Vector2i) -> void:
 	pending_generation_cells.clear()
+	pending_generation_cursor = 0
 
 	for radius in range(eye_line + 1):
 		for x in range(-radius, radius + 1):
@@ -368,13 +458,17 @@ func _rebuild_generation_queue(center: Vector2i) -> void:
 					continue
 				pending_generation_cells.append(grid_pos)
 
+#For each cells add to cleanup queue the cells too far
+#Use eye_line plus a margin value to hide chunks not instantly when go out of the eye line
+#Persistent obstacle cells are not deleted (rails or set_pieces)
 func _rebuild_cleanup_queue(center: Vector2i) -> void:
 	pending_cleanup_cells.clear()
+	pending_cleanup_cursor = 0
 	var safe_margin = 2
 
 	for grid_pos in board.keys():
 		var cell = board[grid_pos]
-		if cell["type"] == "obstacle":
+		if _is_persistent_obstacle(cell):
 			continue
 
 		var dist_x = abs(grid_pos.x - center.x)
@@ -382,10 +476,16 @@ func _rebuild_cleanup_queue(center: Vector2i) -> void:
 		if dist_x > eye_line + safe_margin or dist_z > eye_line + safe_margin:
 			pending_cleanup_cells.append(grid_pos)
 
+#Check if a queue can continue to work based on time budget setted
+func _queue_has_frame_budget(start_usec: int, budget_usec: int, processed: int) -> bool:
+	return processed == 0 or Time.get_ticks_usec() - start_usec < budget_usec
+
 func _drain_generation_queue() -> void:
-	var processed = 0
-	while processed < CHUNK_GENERATION_STEPS_PER_FRAME and not pending_generation_cells.is_empty():
-		var grid_pos = pending_generation_cells.pop_front()
+	var processed: int = 0
+	var start_usec: int = Time.get_ticks_usec()
+	while pending_generation_cursor < pending_generation_cells.size() and _queue_has_frame_budget(start_usec, CHUNK_GENERATION_FRAME_BUDGET_USEC, processed):
+		var grid_pos: Vector2i = pending_generation_cells[pending_generation_cursor]
+		pending_generation_cursor += 1
 		if board.has(grid_pos):
 			continue
 
@@ -394,15 +494,21 @@ func _drain_generation_queue() -> void:
 			_add_compatible_biome(grid_pos)
 		processed += 1
 
+	if pending_generation_cursor >= pending_generation_cells.size():
+		pending_generation_cells.clear()
+		pending_generation_cursor = 0
+
 func _drain_cleanup_queue() -> void:
-	var processed = 0
-	while processed < CHUNK_CLEANUP_STEPS_PER_FRAME and not pending_cleanup_cells.is_empty():
-		var grid_pos = pending_cleanup_cells.pop_front()
+	var processed: int = 0
+	var start_usec: int = Time.get_ticks_usec()
+	while pending_cleanup_cursor < pending_cleanup_cells.size() and _queue_has_frame_budget(start_usec, CHUNK_CLEANUP_FRAME_BUDGET_USEC, processed):
+		var grid_pos: Vector2i = pending_cleanup_cells[pending_cleanup_cursor]
+		pending_cleanup_cursor += 1
 		if not board.has(grid_pos):
 			continue
 
 		var cell = board[grid_pos]
-		if cell["type"] == "obstacle":
+		if _is_persistent_obstacle(cell):
 			continue
 
 		if cell.has("node") and is_instance_valid(cell["node"]):
@@ -410,6 +516,10 @@ func _drain_cleanup_queue() -> void:
 		board.erase(grid_pos)
 		processed += 1
 
+	if pending_cleanup_cursor >= pending_cleanup_cells.size():
+		pending_cleanup_cells.clear()
+		pending_cleanup_cursor = 0
+
 func _queue_lamppost_wire_connection(grid_pos: Vector2i) -> void:
 	if pending_wire_lookup.has(grid_pos):
 		return
@@ -417,9 +527,11 @@ func _queue_lamppost_wire_connection(grid_pos: Vector2i) -> void:
 	pending_wire_cells.append(grid_pos)
 
 func _drain_wire_queue() -> void:
-	var processed = 0
-	while processed < LAMPPOST_WIRE_STEPS_PER_FRAME and not pending_wire_cells.is_empty():
-		var grid_pos = pending_wire_cells.pop_front()
+	var processed: int = 0
+	var start_usec: int = Time.get_ticks_usec()
+	while pending_wire_cursor < pending_wire_cells.size() and _queue_has_frame_budget(start_usec, LAMPPOST_WIRE_FRAME_BUDGET_USEC, processed):
+		var grid_pos: Vector2i = pending_wire_cells[pending_wire_cursor]
+		pending_wire_cursor += 1
 		pending_wire_lookup.erase(grid_pos)
 
 		if not board.has(grid_pos):
@@ -430,6 +542,10 @@ func _drain_wire_queue() -> void:
 		_connect_lamppost_wires(grid_pos)
 		processed += 1
 
+	if pending_wire_cursor >= pending_wire_cells.size():
+		pending_wire_cells.clear()
+		pending_wire_cursor = 0
+
 func _generate_pieces_around_train(center: Vector2i) -> void:
 	for x in range(-eye_line, eye_line + 1):
 		for z in range(-eye_line, eye_line + 1):
@@ -440,6 +556,8 @@ func _generate_pieces_around_train(center: Vector2i) -> void:
 				if not ce_obstacle:
 					_add_compatible_biome(grid_pos)
 
+#Decice which catalogue of chunks use for a cell. If manual_biome is set use always it
+#Otherwise read noise_generator.get_noise_2d to give an index for biome_list
 func _choose_catalogue_by_cell(grid_pos: Vector2i) -> Array[PackedScene]:
 	if manual_biome != null:
 		return manual_biome.available_chunks
@@ -449,6 +567,13 @@ func _choose_catalogue_by_cell(grid_pos: Vector2i) -> Array[PackedScene]:
 	var indice = clamp(int(normalized_value * biome_list.size()), 0, biome_list.size() - 1)
 	return biome_list[indice].available_chunks
 
+func _choose_biome_name_by_cell(grid_pos: Vector2i) -> String:
+	if manual_biome != null:
+		return manual_biome.name
+
+	var value = noise_generator.get_noise_2d(grid_pos.x, grid_pos.y)
+	return _get_procedural_biome_name(value)
+
 func _get_procedural_biome_name(value: float) -> String:
 	if manual_biome != null:
 		return manual_biome.name
@@ -457,6 +582,262 @@ func _get_procedural_biome_name(value: float) -> String:
 	var index = clamp(int(normalized_value * biome_list.size()), 0, biome_list.size() - 1)
 	return biome_list[index].name
 
+func _get_chunk_uniqueness_from_info(info_node: Node) -> int:
+	if info_node != null and "uniqueness" in info_node:
+		return clampi(info_node.uniqueness, 0, MAX_CHUNK_UNIQUENESS)
+	return 0
+
+func _get_prop_uniqueness_from_info(info_node: Node) -> int:
+	if info_node != null and "uniqueness" in info_node:
+		return clampi(info_node.uniqueness, 0, MAX_CHUNK_UNIQUENESS)
+	return -1
+
+func _is_persistent_obstacle(cell: Dictionary) -> bool:
+	return cell.get("type", "") == "obstacle" and cell.get("persistent", true)
+
+func _has_nearby_unique_chunk(grid_pos: Vector2i, uniqueness: int) -> bool:
+	if uniqueness <= 0:
+		return false
+
+	for nearby_pos in board.keys():
+		var nearby_uniqueness = int(board[nearby_pos].get("uniqueness", 0))
+		if nearby_uniqueness <= 0:
+			continue
+
+		var min_distance = maxi(uniqueness, nearby_uniqueness)
+		var dist_x = abs(nearby_pos.x - grid_pos.x)
+		var dist_z = abs(nearby_pos.y - grid_pos.y)
+		if dist_x <= min_distance and dist_z <= min_distance:
+			return true
+	return false
+
+func _get_uniqueness_pick_weight(uniqueness: int) -> float:
+	return 1.0 / pow(float(uniqueness + 1), 2.0)
+
+func _pick_weighted_candidate(candidates: Array) -> Dictionary:
+	var total_weight = 0.0
+	for candidate in candidates:
+		total_weight += candidate.weight
+
+	if total_weight <= 0.0:
+		return candidates.pick_random()
+
+	var target_weight = randf() * total_weight
+	var current_weight = 0.0
+	for candidate in candidates:
+		current_weight += candidate.weight
+		if current_weight >= target_weight:
+			return candidate
+	return candidates.back()
+
+func _pick_backup_scene(zone_catalogue: Array[PackedScene], grid_pos: Vector2i) -> PackedScene:
+	for scene in zone_catalogue:
+		var metadata = _get_chunk_scene_metadata(scene)
+		var uniqueness = int(metadata.get("uniqueness", 0))
+		if not _has_nearby_unique_chunk(grid_pos, uniqueness):
+			return scene
+	return zone_catalogue[0]
+
+func _get_prop_scene_cache_key(scene: PackedScene) -> String:
+	if scene == null:
+		return ""
+	if scene.resource_path != "":
+		return scene.resource_path
+	return "prop_scene_%s" % scene.get_instance_id()
+
+func _get_entity_scene_cache_key(scene: PackedScene) -> String:
+	if scene == null:
+		return ""
+	if scene.resource_path != "":
+		return scene.resource_path
+	return "entity_scene_%s" % scene.get_instance_id()
+
+func _get_entity_scene_metadata(scene: PackedScene) -> Dictionary:
+	if scene == null:
+		return {}
+
+	var key = _get_entity_scene_cache_key(scene)
+	if entity_candidate_cache.has(key):
+		return entity_candidate_cache[key]
+
+	var preview_entity = scene.instantiate()
+	var entity_info_list: Array[Node] = []
+	collect_all_entityinfo(preview_entity, entity_info_list)
+	var info_node = entity_info_list[0] if entity_info_list.size() > 0 else null
+
+	if info_node == null:
+		preview_entity.queue_free()
+		entity_candidate_cache[key] = {}
+		return {}
+
+	var metadata = {
+		"type": info_node.entity_type,
+		"name": info_node.entity_name if "entity_name" in info_node else "",
+		"allowed_biomes": info_node.allowed_biomes.duplicate() if "allowed_biomes" in info_node else [],
+		"weight": maxf(info_node.spawn_uniqueness if "spawn_uniqueness" in info_node else 1.0, 0.0001)
+	}
+	preview_entity.queue_free()
+	entity_candidate_cache[key] = metadata
+	return metadata
+
+func _get_prop_scene_uniqueness(scene: PackedScene) -> int:
+	if scene == null:
+		return -1
+
+	var key = _get_prop_scene_cache_key(scene)
+	if prop_candidate_cache.has(key):
+		return prop_candidate_cache[key]
+
+	var preview_prop = scene.instantiate()
+	var uniqueness = _get_prop_uniqueness_from_info(preview_prop)
+	if uniqueness == -1:
+		var prop_info_list: Array[Node] = []
+		collect_all_propinfo(preview_prop, prop_info_list)
+		if not prop_info_list.is_empty():
+			uniqueness = _get_prop_uniqueness_from_info(prop_info_list[0])
+	preview_prop.queue_free()
+
+	prop_candidate_cache[key] = uniqueness
+	return uniqueness
+
+func _get_marker_prop_uniqueness(marker: Node) -> int:
+	var uniqueness = _get_prop_uniqueness_from_info(marker)
+	if uniqueness == -1:
+		return 0
+	return uniqueness
+
+func _pick_weighted_prop_scene(marker: Node) -> PackedScene:
+	var candidates = []
+	var fallback_uniqueness = _get_marker_prop_uniqueness(marker)
+
+	for prop_scene in marker.available_props:
+		if prop_scene == null:
+			continue
+
+		var uniqueness = _get_prop_scene_uniqueness(prop_scene)
+		if uniqueness == -1:
+			uniqueness = fallback_uniqueness
+
+		candidates.append({
+			"scene": prop_scene,
+			"weight": _get_uniqueness_pick_weight(uniqueness),
+			"uniqueness": uniqueness
+		})
+
+	if candidates.is_empty():
+		return null
+	return _pick_weighted_candidate(candidates).scene
+
+func _spawn_props_for_chunk(root: Node) -> void:
+	var prop_markers: Array[Node] = []
+	collect_all_propinfo(root, prop_markers)
+
+	for marker in prop_markers:
+		_spawn_prop_for_marker(marker)
+
+func _spawn_prop_for_marker(marker: Node) -> void:
+	if marker.available_props.is_empty():
+		return
+
+	var prop_scene = _pick_weighted_prop_scene(marker)
+	if prop_scene == null:
+		return
+
+	var prop_instance = prop_scene.instantiate()
+	var prop_node = prop_instance as Node3D
+	if prop_node == null:
+		prop_instance.queue_free()
+		return
+
+	marker.add_child(prop_node)
+	prop_node.transform = Transform3D.IDENTITY
+
+func _spawn_entities_for_chunk(root: Node, biome_name: String) -> void:
+	if entity_pool == null or not "available_entities" in entity_pool:
+		return
+	if entity_pool.available_entities.is_empty():
+		return
+	if entity_spawn_probability <= 0.0 or max_entities_per_chunk <= 0:
+		return
+	if entity_candidate_cache.is_empty():
+		_warm_entity_candidate_cache()
+
+	var spawn_points: Array[Node] = []
+	collect_all_entity_spawn_points(root, spawn_points)
+	if spawn_points.is_empty():
+		return
+
+	spawn_points.shuffle()
+	var spawned_count: int = 0
+	for spawn_point in spawn_points:
+		if spawned_count >= max_entities_per_chunk:
+			break
+
+		var point_node = spawn_point as Node3D
+		if point_node == null:
+			continue
+
+		var spawn_chance = entity_spawn_probability
+		if "spawn_chance" in spawn_point:
+			spawn_chance *= spawn_point.spawn_chance
+		if randf() > spawn_chance:
+			continue
+
+		var entity_scene = _pick_compatible_entity(biome_name, _get_spawn_point_type_filter(spawn_point))
+		if entity_scene == null:
+			continue
+
+		var entity_instance = entity_scene.instantiate()
+		var entity_node = entity_instance as Node3D
+		if entity_node == null:
+			entity_instance.queue_free()
+			continue
+
+		root.add_child(entity_node)
+		entity_node.global_transform = point_node.global_transform
+		if "random_y_rotation" in spawn_point and spawn_point.random_y_rotation:
+			entity_node.rotate_y(randf() * TAU)
+		spawned_count += 1
+
+func _get_spawn_point_type_filter(spawn_point: Node) -> int:
+	if "allowed_type" in spawn_point:
+		match spawn_point.allowed_type:
+			ENTITY_SPAWN_HUMANOID_ONLY:
+				return ENTITY_TYPE_HUMANOID
+			ENTITY_SPAWN_ANIMAL_ONLY:
+				return ENTITY_TYPE_ANIMAL
+	return -1
+
+func _pick_compatible_entity(biome_name: String, type_filter: int) -> PackedScene:
+	if entity_pool == null or not "available_entities" in entity_pool:
+		return null
+
+	var candidates = []
+	for entity_scene in entity_pool.available_entities:
+		if entity_scene == null:
+			continue
+
+		var metadata = _get_entity_scene_metadata(entity_scene)
+		if metadata.is_empty():
+			continue
+		if type_filter != -1 and int(metadata["type"]) != type_filter:
+			continue
+
+		var allowed_biomes: Array = metadata.get("allowed_biomes", [])
+		if not allowed_biomes.is_empty() and not allowed_biomes.has(biome_name):
+			continue
+
+		candidates.append({
+			"scene": entity_scene,
+			"weight": float(metadata.get("weight", 1.0))
+		})
+
+	if candidates.is_empty():
+		return null
+	return _pick_weighted_candidate(candidates).scene
+
+#Using a vertical raycast from the top to the bottom at the center of the cell
+#If there is a collision search for a new chunk node
 func _register_cell_with_ray(grid_pos: Vector2i) -> bool:
 	if board.has(grid_pos): return true 
 	
@@ -504,6 +885,7 @@ func _register_cell_with_ray(grid_pos: Vector2i) -> bool:
 		var river_exit_found = {"north": false, "est": false, "south": false, "west": false}
 		var height_found = {"north": 0, "est": 0, "south": 0, "west": 0}
 		var have_lamppost = false
+		var uniqueness = 0
 		
 		#Get node info
 		if right_info_node != null:
@@ -517,6 +899,8 @@ func _register_cell_with_ray(grid_pos: Vector2i) -> bool:
 			if "have_lamppost" in right_info_node:
 				have_lamppost = right_info_node.have_lamppost
 
+			uniqueness = _get_chunk_uniqueness_from_info(right_info_node)
+
 		#Add piece to the grid
 		board[grid_pos] = {
 			"type": "obstacle", 
@@ -525,7 +909,9 @@ func _register_cell_with_ray(grid_pos: Vector2i) -> bool:
 			"heights": height_found, 
 			"node": root_chunk,  
 			"info": right_info_node,     
-			"have_lamppost": have_lamppost
+			"have_lamppost": have_lamppost,
+			"uniqueness": uniqueness,
+			"persistent": true
 		}
 		
 		if have_lamppost:
@@ -534,6 +920,11 @@ func _register_cell_with_ray(grid_pos: Vector2i) -> bool:
 		return true 
 	return false 
 
+#For the cell to fill check the contrains for the four neighbors:
+#If the neighbor at north have and exit on south then new chunk should have exit to north (the same for east and ovest)
+#Contrains: 1 -> connection is mandatory; 0 -> no connection; -1 -> no contrain because there is no neighbor or it already exits
+#When generator know the contrains take all chunks and try all different rotations
+#A candidate is valid only if all contrains are correct
 func _add_compatible_biome(grid_pos: Vector2i) -> void:
 	var req_conn_north = _needed_connection(grid_pos + Vector2i(0, -1), "south")
 	var req_conn_est = _needed_connection(grid_pos + Vector2i(1, 0), "west")
@@ -553,6 +944,7 @@ func _add_compatible_biome(grid_pos: Vector2i) -> void:
 	var height_target = clamp(roundi((height_noise + 1.0) / 2.0), 0, 1)
 	
 	var zone_catalogue = _choose_catalogue_by_cell(grid_pos)
+	var biome_name = _choose_biome_name_by_cell(grid_pos)
 	var valid_candidates = []
 	
 	for scene in zone_catalogue:
@@ -566,6 +958,9 @@ func _add_compatible_biome(grid_pos: Vector2i) -> void:
 			var u_conn = data["connections"]
 			var u_river_conn = data["river_connections"]
 			var u_height = data["heights"]
+			var uniqueness = int(metadata.get("uniqueness", 0))
+			if _has_nearby_unique_chunk(grid_pos, uniqueness):
+				continue
 			
 			var match_conn_n = (req_conn_north == -1) or ((req_conn_north == 1) == u_conn["north"])
 			var match_conn_e = (req_conn_est == -1)  or ((req_conn_est == 1) == u_conn["est"])
@@ -594,7 +989,14 @@ func _add_compatible_biome(grid_pos: Vector2i) -> void:
 				if req_height_south == -1 and u_height["south"] == height_target: score += 1
 				if req_height_west == -1 and u_height["west"] == height_target: score += 1
 				
-				valid_candidates.append({"scene": scene, "rotation": rot, "data": data, "score": score})
+				valid_candidates.append({
+					"scene": scene,
+					"rotation": rot,
+					"data": data,
+					"score": score,
+					"weight": _get_uniqueness_pick_weight(uniqueness),
+					"uniqueness": uniqueness
+				})
 		
 	if valid_candidates.size() > 0:
 		var max_score = -1
@@ -605,37 +1007,48 @@ func _add_compatible_biome(grid_pos: Vector2i) -> void:
 		for c in valid_candidates:
 			if c.score == max_score: best_candidate.append(c)
 				
-		var choise = best_candidate.pick_random()
+		var choise = _pick_weighted_candidate(best_candidate)
 		var new_chunk = choise.scene.instantiate()
 		new_chunk.position = Vector3(grid_pos.x * chunk_size, 0, grid_pos.y * chunk_size)
 		new_chunk.rotation.y = choise.rotation * (-PI / 2.0)
 		add_child(new_chunk)
+		_spawn_props_for_chunk(new_chunk)
+		_spawn_entities_for_chunk(new_chunk, biome_name)
 		
 		var info_new = _get_cached_chunk_info(new_chunk, choise.scene)
 		
 		var have_lamppost = false
 		if info_new != null and "have_lamppost" in info_new:
 			have_lamppost = info_new.have_lamppost
+
+		var river_flow_direction = _calculate_river_flow_direction(grid_pos, choise.data["river_connections"])
+		_apply_river_flow_direction(new_chunk, river_flow_direction)
 			
 		board[grid_pos] = {
-			"type": "bioma", 
+			"type": "biome", 
 			"exit": choise.data["connections"], 
 			"river_exit": choise.data["river_connections"],
+			"river_flow_direction": river_flow_direction,
 			"heights": choise.data["heights"], 
 			"node": new_chunk, 
 			"info": info_new,
-			"have_lamppost": have_lamppost
+			"have_lamppost": have_lamppost,
+			"uniqueness": choise.uniqueness
 		}
 		
 		if have_lamppost:
 			_queue_lamppost_wire_connection(grid_pos)
 
 	else:	
-		var backup = zone_catalogue[0].instantiate()
+		var backup_scene = _pick_backup_scene(zone_catalogue, grid_pos)
+		var backup = backup_scene.instantiate()
 		backup.position = Vector3(grid_pos.x * chunk_size, 0, grid_pos.y * chunk_size)
 		add_child(backup)
+		_spawn_props_for_chunk(backup)
+		_spawn_entities_for_chunk(backup, biome_name)
 		
-		var info_backup = _get_cached_chunk_info(backup, zone_catalogue[0])
+		var info_backup = _get_cached_chunk_info(backup, backup_scene)
+		var backup_uniqueness = _get_chunk_uniqueness_from_info(info_backup)
 	
 		var safe_heights = {
 			"north": req_height_north if req_height_north != -1 else height_target,
@@ -647,12 +1060,112 @@ func _add_compatible_biome(grid_pos: Vector2i) -> void:
 			"type": "biome", 
 			"exit": {"north":false, "est":false, "south":false, "west":false}, 
 			"river_exit": {"north":false, "est":false, "south":false, "west":false},
+			"river_flow_direction": Vector2.ZERO,
 			"heights": safe_heights, 
 			"node": backup,
 			"info": info_backup,
-			"have_lamppost": false
+			"have_lamppost": false,
+			"uniqueness": backup_uniqueness
 		}
 
+#Check if a neighbors have a river direction: if yes try to continue it,
+#otherwise create a direction based on connections
+func _calculate_river_flow_direction(grid_pos: Vector2i, river_connections: Dictionary) -> Vector2:
+	var connected_sides: Array[String] = []
+	for side in RIVER_SIDE_ORDER:
+		if river_connections.has(side) and river_connections[side]:
+			connected_sides.append(side)
+
+	if connected_sides.is_empty():
+		return Vector2.ZERO
+
+	var neighbour_flow = _get_connected_neighbour_river_flow(grid_pos, connected_sides)
+	if not neighbour_flow.is_zero_approx():
+		var continued_flow = _continue_river_flow_from_neighbour(grid_pos, connected_sides, neighbour_flow)
+		if not continued_flow.is_zero_approx():
+			return continued_flow.normalized()
+
+	var default_flow = _get_default_river_flow(connected_sides)
+	if default_flow.is_zero_approx():
+		return Vector2.ZERO
+	return default_flow.normalized()
+
+func _get_connected_neighbour_river_flow(grid_pos: Vector2i, connected_sides: Array[String]) -> Vector2:
+	for side in connected_sides:
+		var neighbour_pos: Vector2i = grid_pos + RIVER_NEIGHBOUR_OFFSETS[side]
+		if not board.has(neighbour_pos):
+			continue
+		var neighbour = board[neighbour_pos]
+		if not neighbour.has("river_flow_direction"):
+			continue
+		var neighbour_flow: Vector2 = neighbour["river_flow_direction"]
+		if not neighbour_flow.is_zero_approx():
+			return neighbour_flow.normalized()
+	return Vector2.ZERO
+
+func _continue_river_flow_from_neighbour(grid_pos: Vector2i, connected_sides: Array[String], neighbour_flow: Vector2) -> Vector2:
+	for side in connected_sides:
+		var neighbour_pos: Vector2i = grid_pos + RIVER_NEIGHBOUR_OFFSETS[side]
+		if not board.has(neighbour_pos):
+			continue
+		var neighbour = board[neighbour_pos]
+		if not neighbour.has("river_flow_direction"):
+			continue
+		var side_direction: Vector2 = RIVER_DIRECTIONS[side]
+		var neighbour_direction: Vector2 = neighbour["river_flow_direction"]
+		if neighbour_direction.is_zero_approx():
+			continue
+		neighbour_direction = neighbour_direction.normalized()
+		var other_sides = connected_sides.duplicate()
+		other_sides.erase(side)
+		if other_sides.is_empty():
+			return neighbour_direction
+
+		var other_direction = _get_average_river_side_direction(other_sides)
+		if neighbour_direction.dot(-side_direction) > 0.25:
+			return other_direction - side_direction
+		if neighbour_direction.dot(side_direction) > 0.25:
+			return side_direction - other_direction
+
+	var default_flow = _get_default_river_flow(connected_sides)
+	if default_flow.dot(neighbour_flow) < 0.0:
+		return -default_flow
+	return default_flow
+
+func _get_default_river_flow(connected_sides: Array[String]) -> Vector2:
+	if connected_sides.size() == 1:
+		return RIVER_DIRECTIONS[connected_sides[0]]
+
+	if connected_sides.has("north") and connected_sides.has("south"):
+		return Vector2(0.0, 1.0)
+	if connected_sides.has("est") and connected_sides.has("west"):
+		return Vector2(1.0, 0.0)
+
+	var start_direction: Vector2 = RIVER_DIRECTIONS[connected_sides[0]]
+	var end_direction = _get_average_river_side_direction(connected_sides.slice(1))
+	return end_direction - start_direction
+
+func _get_average_river_side_direction(sides: Array[String]) -> Vector2:
+	var direction := Vector2.ZERO
+	for side in sides:
+		direction += RIVER_DIRECTIONS[side]
+	if direction.is_zero_approx():
+		return Vector2.ZERO
+	return direction / float(sides.size())
+
+func _apply_river_flow_direction(root: Node, flow_direction: Vector2) -> void:
+	if flow_direction.is_zero_approx():
+		return
+	_set_river_flow_direction_recursive(root, flow_direction.normalized())
+
+func _set_river_flow_direction_recursive(node: Node, flow_direction: Vector2) -> void:
+	if node is MeshInstance3D and node.name.begins_with("Water_F"):
+		var mesh_instance := node as MeshInstance3D
+		mesh_instance.set_instance_shader_parameter("river_flow_direction", flow_direction)
+
+	for child in node.get_children():
+		_set_river_flow_direction_recursive(child, flow_direction)
+
 func _needed_connection(near_pos: Vector2i, side_needed: String) -> int:
 	if not board.has(near_pos): 
 		_register_cell_with_ray(near_pos)
@@ -742,37 +1255,6 @@ func _connect_lamppost_wires(new_board_pos: Vector2i) -> void:
 							p_sx_your_best = closest_sx[i_t]
 							p_dx_your_best = closest_dx[i_t]
 
-	if best_closest_to_root == null:
-		for x in range(-ray_research, ray_research + 1):
-			for z in range(-ray_research, ray_research + 1):
-				if x == 0 and z == 0: continue
-				
-				var closest_pos = new_board_pos + Vector2i(x, z)
-				if board.has(closest_pos) and board[closest_pos].get("have_lamppost", false):
-					var closest_root = board[closest_pos]["node"]
-					var closest_info = board[closest_pos]["info"]
-
-					if not is_instance_valid(closest_root) or closest_root == new_root or closest_info == null: continue
-					
-					if closest_info is Node3D: closest_info.force_update_transform()
-					var closest_sx = _get_lampposts(closest_info, "sx")
-					var closest_dx = _get_lampposts(closest_info, "dx")
-					if closest_sx.is_empty() or closest_dx.is_empty(): continue
-					
-					for i_m in range(new_sx.size()):
-						for i_t in range(closest_sx.size()):
-							var c_mio = (new_sx[i_m].global_position + new_dx[i_m].global_position) / 2.0
-							var c_tuo = (closest_sx[i_t].global_position + closest_dx[i_t].global_position) / 2.0
-							var dist = c_mio.distance_to(c_tuo)
-							
-							if dist < best_distance:
-								best_distance = dist
-								best_closest_to_root = closest_root
-								p_sx_my_best = new_sx[i_m]
-								p_dx_my_best = new_dx[i_m]
-								p_sx_your_best = closest_sx[i_t]
-								p_dx_your_best = closest_dx[i_t]
-
 	var max_dist = chunk_size * lamppost_dist_factor
 	
 	if best_closest_to_root != null and best_distance < max_dist:
@@ -791,7 +1273,7 @@ func _connect_lamppost_wires(new_board_pos: Vector2i) -> void:
 		if not wire_connections.has(closest_id): wire_connections[closest_id] = 0
 		wire_connections[closest_id] += 1
 
-#draw lamppost
+#draw lamppost wires
 func _draw_parable(p1: Vector3, p2: Vector3, parent: Node3D) -> void:
 	var segments = 15
 	var lowering = 1.5 

core/biome_generator/biome_generator.tscn

@@ -2,7 +2,9 @@
 
 [ext_resource type="Script" uid="uid://ct2k25kslaxe5" path="res://core/biome_generator/biome_generator.gd" id="1_c7ilo"]
 [ext_resource type="Material" uid="uid://b8p1sjxisi522" path="res://core/biome_generator/wires.tres" id="2_w42pm"]
+[ext_resource type="Resource" path="res://core/biome_generator/railway_pool.tres" id="3_railway_pool"]
 
 [node name="biome_generator" type="Node3D" unique_id=1861369341]
 script = ExtResource("1_c7ilo")
+railway_pool = ExtResource("3_railway_pool")
 lamppost_wire_material = ExtResource("2_w42pm")

core/biome_generator/chunk_info.gd

@@ -5,6 +5,7 @@ class_name ChunkInfo
 
 @export_group("Set Piece Rules (Unique pieces)")
 @export var exclusive_biome: String = "" # Es: "Forest"
+@export_range(0, 5, 1) var uniqueness: int = 0 #0=common; 5=unique
 
 @export_group("Base exit")
 @export var north: bool = false

core/biome_generator/entities_pool.tres

@@ -0,0 +1,9 @@
+[gd_resource type="Resource" script_class="EntityPool" format=3 uid="uid://cmd6s6thq4f7r"]
+
+[ext_resource type="PackedScene" uid="uid://clx701xdwelgx" path="res://core/ai/agents/base/ai_base.tscn" id="1_0kfj8"]
+[ext_resource type="Script" uid="uid://53ryr0fsqiq7" path="res://core/biome_generator/entity_pool.gd" id="1_vccp2"]
+
+[resource]
+script = ExtResource("1_vccp2")
+name = "Entity Pool"
+available_entities = Array[PackedScene]([ExtResource("1_0kfj8")])

core/biome_generator/entity_pool.gd

@@ -0,0 +1,5 @@
+extends Resource
+class_name EntityPool
+
+@export var name: String = "New Entity Pool"
+@export var available_entities: Array[PackedScene] = []

core/biome_generator/entity_pool.gd.uid

@@ -0,0 +1 @@
+uid://53ryr0fsqiq7

core/biome_generator/entity_spawn_point.gd

@@ -0,0 +1,8 @@
+extends Marker3D
+class_name EntitySpawnPoint
+
+enum AllowedType { ANY, HUMANOID_ONLY, ANIMAL_ONLY }
+
+@export var allowed_type: AllowedType = AllowedType.ANY
+@export_range(0.0, 1.0, 0.01) var spawn_chance: float = 1.0
+@export var random_y_rotation: bool = true

core/biome_generator/entity_spawn_point.gd.uid

@@ -0,0 +1 @@
+uid://c5ercbqy7srx3

core/biome_generator/prop_info.gd

@@ -0,0 +1,5 @@
+extends Marker3D
+class_name PropInfo
+
+@export var available_props: Array[PackedScene]
+@export_range(0, 5, 1) var uniqueness: int = 0 #0=common; 5=unique

core/biome_generator/prop_info.gd.uid

@@ -0,0 +1 @@
+uid://dg6ngy4pmtsyc

core/biome_generator/railway_pool.gd

@@ -0,0 +1,5 @@
+extends Resource
+class_name RailwayPool
+
+@export var name: String = "New Railway Pool"
+@export var available_railways: Array[PackedScene] = []

core/biome_generator/railway_pool.gd.uid

@@ -0,0 +1 @@
+uid://c374rv220mvh1

core/biome_generator/railway_pool.tres

@@ -0,0 +1,16 @@
+[gd_resource type="Resource" script_class="RailwayPool" format=3 uid="uid://nrm040srfjwo"]
+
+[ext_resource type="PackedScene" uid="uid://cl2ast2tk7ifw" path="res://tgcc/chunk/railway/scene/chunk_railway_curve.tscn" id="1_86h1y"]
+[ext_resource type="PackedScene" uid="uid://85l80b6jcdhr" path="res://tgcc/chunk/railway/scene/chunk_railway_curve_2.tscn" id="2_r0882"]
+[ext_resource type="PackedScene" uid="uid://cewdxvcpqb53f" path="res://tgcc/chunk/railway/scene/chunk_railway_station_doubleside.tscn" id="3_3auto"]
+[ext_resource type="PackedScene" uid="uid://d3pcshw2bioic" path="res://tgcc/chunk/railway/scene/chunk_railway_station_oneside.tscn" id="4_i1umq"]
+[ext_resource type="PackedScene" uid="uid://bqxpqhla2kogq" path="res://tgcc/chunk/railway/scene/chunk_railway_straight.tscn" id="5_x44at"]
+[ext_resource type="PackedScene" uid="uid://c3ub6rj0tlt6q" path="res://tgcc/chunk/railway/scene/chunk_railway_straight_2.tscn" id="6_vrrkw"]
+[ext_resource type="PackedScene" uid="uid://cqevecsd1cm1v" path="res://tgcc/chunk/railway/scene/chunk_railway_straight_3.tscn" id="7_l17bw"]
+[ext_resource type="PackedScene" uid="uid://f53hfrjaxkwa" path="res://tgcc/chunk/railway/scene/chunk_railway_straight_bridge.tscn" id="8_qcl5o"]
+[ext_resource type="Script" uid="uid://c374rv220mvh1" path="res://core/biome_generator/railway_pool.gd" id="9_8tdc7"]
+
+[resource]
+script = ExtResource("9_8tdc7")
+name = "Railway Pool"
+available_railways = Array[PackedScene]([ExtResource("1_86h1y"), ExtResource("2_r0882"), ExtResource("3_3auto"), ExtResource("4_i1umq"), ExtResource("5_x44at"), ExtResource("6_vrrkw"), ExtResource("7_l17bw"), ExtResource("8_qcl5o")])

core/daynight/environment_management.tscn

@@ -32,6 +32,7 @@ render_priority = 0
 shader = ExtResource("2_r4tfj")
 shader_parameter/use_red_as_alpha = true
 shader_parameter/fog_color = Color(0.8, 0.85, 0.9, 0.5)
+shader_parameter/fog_density = 0.25
 shader_parameter/scroll_speed = Vector2(0.05, 0.01)
 shader_parameter/texture_scale = Vector2(1, 1)
 shader_parameter/edge_softness_y = 0.2
@@ -66,12 +67,12 @@ grad_intensity_morning = 0.05
 grad_intensity_afternoon = 0.1
 grad_intensity_night = 0.5
 fog_color_morning = Color(0.7490196, 0.8509804, 0.9490196, 1)
-fog_color_afternoon = Color(0.9647059, 0.5882353, 0.7607843, 1)
-fog_color_night = Color(0.14901961, 0.101960786, 0.2509804, 1)
+fog_color_afternoon = Color(0.9823975, 0.8034449, 0.8778439, 1)
+fog_color_night = Color(0.38409987, 0.28720453, 0.5907528, 1)
 fog_density_morning = 0.01
 fog_density_afternoon = 0.02
 glow_morning = 0.4
-glow_night = 0.6
+glow_night = 0.8
 material_fog = SubResource("ShaderMaterial_b5atu")
 material_drops = SubResource("StandardMaterial3D_r4tfj")
 material_clouds = SubResource("ShaderMaterial_ruhh7")
@@ -80,7 +81,7 @@ lightning_min = 2
 lightning_max = 4
 lightning_scale_min = 2.0
 lightning_scale_max = 5.0
-godray_max_rain = 60
+godray_max_rain = 30
 godray_spawn_radius = 100.0
 godray_spawn_offset = Vector3(20, 80, 20)
 godray_rotation_degrees = Vector3(50, 30, 0)
@@ -261,6 +262,7 @@ shader = ExtResource("2_r4tfj")
 shader_parameter/fog_noise = ExtResource("11_tuauy")
 shader_parameter/use_red_as_alpha = true
 shader_parameter/fog_color = Color(0.8, 0.8509804, 0.9019608, 0.2509804)
+shader_parameter/fog_density = 0.25
 shader_parameter/scroll_speed = Vector2(0, 0.01)
 shader_parameter/texture_scale = Vector2(1, 1)
 shader_parameter/edge_softness_y = 0.16400000779

core/daynight/environment_manager.gd

@@ -3,7 +3,6 @@ extends Node3D
 
 const NOISE_TEXTURE: Texture2D = preload("res://core/daynight/noise.tres")
 const WEATHER_SHADER: Material = preload("res://core/daynight/weather_overlay.tres")
-const WEATHER_PLAIN_SHADER: Material = preload("res://core/daynight/weather_plain_shader.tres")
 const DYNAMIC_ENVIRONMENT_UPDATES_PER_FRAME: int = 2 #how many update of the environment (apply materials) will be done per frame
 
 @export var environment_config: EnvironmentConfig
@@ -134,7 +133,7 @@ func _apply_dynamic_environment_materials(node: Node) -> void:
 		_apply_weather_overlay_to_node(node, WEATHER_SHADER)
 
 	if node.is_in_group("weather_vegetables_node"):
-		_apply_weather_overlay_to_node(node, WEATHER_PLAIN_SHADER)
+		_clear_weather_overlay_from_node(node)
 
 func ApplyWindNoiseToMaterials():
 	for node in get_tree().get_nodes_in_group("wind_node"):
@@ -160,15 +159,54 @@ func ApplyWeatherShaderToMaterials():
 		_apply_weather_overlay_to_node(node, WEATHER_SHADER)
 
 	for node in get_tree().get_nodes_in_group("weather_vegetables_node"):
-		_apply_weather_overlay_to_node(node, WEATHER_PLAIN_SHADER)
+		_clear_weather_overlay_from_node(node)
 
 func _apply_weather_overlay_to_node(node: Node, material: Material) -> void:
+	if node.is_in_group("weather_vegetables_node"):
+		_clear_weather_overlay_from_node(node)
+		return
+
 	if node is GeometryInstance3D:
-		node.material_overlay = material
+		if _geometry_uses_alpha_texture(node):
+			node.material_overlay = null
+		else:
+			node.material_overlay = material
 
 	for child in node.get_children():
 		_apply_weather_overlay_to_node(child, material)
 
+func _clear_weather_overlay_from_node(node: Node) -> void:
+	if node is GeometryInstance3D:
+		node.material_overlay = null
+
+	for child in node.get_children():
+		_clear_weather_overlay_from_node(child)
+
+func _geometry_uses_alpha_texture(node: GeometryInstance3D) -> bool:
+	var material_override := node.material_override as ShaderMaterial
+	if _shader_material_uses_alpha_texture(material_override):
+		return true
+
+	if node is MeshInstance3D:
+		for surface_index in node.get_surface_override_material_count():
+			var surface_material := node.get_surface_override_material(surface_index) as ShaderMaterial
+			if _shader_material_uses_alpha_texture(surface_material):
+				return true
+
+		if node.mesh:
+			for surface_index in node.mesh.get_surface_count():
+				var mesh_material := node.mesh.surface_get_material(surface_index) as ShaderMaterial
+				if _shader_material_uses_alpha_texture(mesh_material):
+					return true
+
+	return false
+
+func _shader_material_uses_alpha_texture(material: ShaderMaterial) -> bool:
+	if material == null or material.shader == null:
+		return false
+
+	return material.shader.code.find("alpha_texture") != -1
+
 func select_day_time(normalized_time: float) -> void:
 	#set show_day_time_debug = true to show debug on screen
 	#normalized_time is a value between 0 and 1; the time of the day is calculate as "normalized_time" * 1440; day_time is the step to pass from sunrise, to day, to sunset, to night

core/daynight/environment_shadows.gdshader

@@ -67,7 +67,6 @@ void fragment() {
 				float is_center = step(center_sharpness, internal_n);
 
 				ALBEDO = shadow_color;
-				
 				ALPHA = mix(opacity_edge, opacity_center, is_center) * final_fade;
 			}
 		}

core/daynight/fog.gdshader

@@ -7,6 +7,7 @@ uniform bool use_red_as_alpha = true;
 
 group_uniforms Settings;
 uniform vec4 fog_color : source_color = vec4(0.8, 0.85, 0.9, 0.5);
+uniform float fog_density : hint_range(0.0, 1.0) = 0.25;
 uniform vec2 scroll_speed = vec2(0.05, 0.01);
 uniform vec2 texture_scale = vec2(1.0, 1.0);
 
@@ -36,5 +37,5 @@ void fragment() {
 	vec3 dark_fog = tinted_fog * 0.5;
 	ALBEDO = mix(tinted_fog, dark_fog, night_intensity);
 	
-	ALPHA = fog_color.a * noise_alpha * edge_mask;
-}
+	ALPHA = fog_color.a * fog_density * noise_alpha * edge_mask;
+}

core/daynight/grass_leaves.gdshader

@@ -8,10 +8,12 @@ global uniform float global_wind_speed;
 global uniform float global_wind_strength;
 global uniform vec2 global_wind_direction;
 //global uniform sampler2D global_wind_noise : filter_linear_mipmap;
-global uniform float global_snow_start_time;
-global uniform float global_snow_accumulation_speed;
-global uniform float global_snow_melt_time;
-global uniform float global_snow_melt_speed;
+global uniform float global_snow_start_time = -1.0;
+global uniform float global_snow_accumulation_speed = 0.005;
+global uniform float global_snow_melt_time = -1.0;
+global uniform float global_snow_melt_speed = 0.1;
+global uniform float global_snow_amount = 0.0;
+global uniform float global_rain_intensity;
 
 // --- PARAMETRI ESTETICI ---
 uniform bool billboard_enabled = true; 
@@ -31,6 +33,7 @@ uniform vec4 variance_color : source_color = vec4(0.3, 0.5, 0.2, 1.0); // Colore
 uniform float variance_intensity : hint_range(0.0, 1.0) = 0.4; // Quanto si vedono le chiazze
 
 uniform vec4 snow_color : source_color = vec4(0.85, 0.9, 0.95, 1.0);
+uniform float snow_visibility : hint_range(0.0, 1.0) = 1.0;
 
 // --- CONTROLLO GRADIENTE E RANDOM ---
 uniform float height_min = 0.0;
@@ -41,6 +44,7 @@ uniform float light_steps : hint_range(1.0, 10.0) = 4.0;
 uniform float random_mix : hint_range(0.0, 1.0) = 0.3;
 
 uniform float cast_shadow_strength : hint_range(0.0, 1.0) = 0.6;
+uniform float wetness_darkening : hint_range(0.0, 0.5) = 0.25;
 
 varying vec3 v_final_color;
 varying float v_shade_factor; 
@@ -52,6 +56,21 @@ float hash(vec3 p) {
 	return fract((p.x + p.y) * p.z);
 }
 
+float get_snow_progress() {
+	float snow_progress = clamp(global_snow_amount, 0.0, 1.0);
+
+	if (global_snow_start_time >= 0.0) {
+		float timed_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
+		snow_progress = max(snow_progress, timed_progress);
+	}
+	if (global_snow_melt_time >= 0.0) {
+		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
+		snow_progress = min(snow_progress, 1.0 - melt);
+	}
+
+	return snow_progress;
+}
+
 void vertex() {
 	vec3 instance_pos = MODEL_MATRIX[3].xyz;
 	v_world_pos = instance_pos; // Salviamo la posizione dell'istanza
@@ -113,17 +132,10 @@ void fragment() {
 	// Applichiamo la variazione al colore finale dell'erba
 	vec3 varied_grass_color = mix(v_final_color, variance_color.rgb, noise_sample * variance_intensity);
 
-	float snow_amount = 0.0;
-	if (global_snow_start_time >= 0.0) {
-		snow_amount = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
-	}
-	if (global_snow_melt_time >= 0.0) {
-		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
-		snow_amount *= (1.0 - melt);
-	}
+	float snow_amount = smoothstep(0.0, 1.0, get_snow_progress());
 	
 	float top_mask = 1.0 - shifted_uv.y; 
-	float snow_mask = smoothstep(1.0 - snow_amount, 1.2 - snow_amount, top_mask);
+	float snow_mask = smoothstep(0.65, 1.0, top_mask) * snow_amount * snow_visibility;
 	snow_mask *= step(0.01, snow_amount);
 	
 	vec3 dark_snow = snow_color.rgb * (1.0 - shadow_intensity);
@@ -131,12 +143,15 @@ void fragment() {
 	
 	// Mescoliamo il colore variato con la neve
 	vec3 final_albedo = mix(varied_grass_color, shaded_snow, snow_mask);
+	float rain_int = clamp(global_rain_intensity, 0.0, 1.0);
+	final_albedo *= mix(1.0, 1.0 - wetness_darkening, rain_int);
+	float final_roughness = mix(0.02, 0.005, rain_int);
 
 	ALBEDO = final_albedo;
 	ALPHA = tex.r * opacity; 
 	ALPHA_SCISSOR_THRESHOLD = 0.5;
 	
-	ROUGHNESS = 0.02; 
+	ROUGHNESS = final_roughness; 
 }
 
 void light() {

core/daynight/snow_cap.gdshader

@@ -2,9 +2,10 @@ shader_type spatial;
 render_mode blend_mix, cull_back, depth_draw_opaque;
 
 global uniform float global_snow_start_time = -1.0;
-global uniform float global_snow_accumulation_speed = 0.1;
+global uniform float global_snow_accumulation_speed = 0.005;
 global uniform float global_snow_melt_time = -1.0;
 global uniform float global_snow_melt_speed = 0.1;
+global uniform float global_snow_amount = 0.0;
 global uniform vec4 global_snow_color = vec4(0.92, 0.96, 1.0, 1.0);
 
 uniform float max_height : hint_range(0.02, 1.0) = 0.2;
@@ -51,17 +52,18 @@ float fbm(vec2 p) {
 }
 
 float get_snow_amount() {
-	float snow_amount = 0.0;
+	float snow_amount = clamp(global_snow_amount, 0.0, 1.0);
 	if (global_snow_start_time >= 0.0) {
-		snow_amount = clamp(
+		float timed_amount = clamp(
 			(TIME - global_snow_start_time) * global_snow_accumulation_speed,
 			0.0,
 			1.0
 		);
+		snow_amount = max(snow_amount, timed_amount);
 	}
 	if (global_snow_melt_time >= 0.0) {
 		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
-		snow_amount *= (1.0 - melt);
+		snow_amount = min(snow_amount, 1.0 - melt);
 	}
 	return snow_amount;
 }

core/daynight/tree_leaves.gdshader

@@ -6,12 +6,12 @@ global uniform vec2  global_wind_direction;
 global uniform float global_wind_scale;
 global uniform float global_wind_strength;
 global uniform float global_wind_fade;
-/*
-global uniform float global_snow_start_time;
-global uniform float global_snow_accumulation_speed;
-global uniform float global_snow_melt_time;
-global uniform float global_snow_melt_speed;
-global uniform vec4  global_snow_color;*/
+global uniform float global_snow_start_time = -1.0;
+global uniform float global_snow_accumulation_speed = 0.005;
+global uniform float global_snow_melt_time = -1.0;
+global uniform float global_snow_melt_speed = 0.1;
+global uniform float global_snow_amount = 0.0;
+global uniform vec4  global_snow_color;
 global uniform float global_rain_intensity;
 
 uniform sampler2D wind_noise : filter_linear_mipmap;
@@ -31,6 +31,7 @@ uniform float light_steps : hint_range(1.0, 10.0) = 4.0;
 uniform float random_mix : hint_range(0.0, 1.0) = 0.3;
 uniform float cast_shadow_strength : hint_range(0.0, 1.0) = 0.6;
 uniform float wetness_darkening : hint_range(0.0, 0.5) = 0.25;
+uniform float snow_visibility : hint_range(0.0, 1.0) = 1.0;
 
 varying vec3 v_final_color;
 varying float v_shade_factor;
@@ -41,6 +42,21 @@ float hash(vec3 p) {
     return fract((p.x + p.y) * p.z);
 }
 
+float get_snow_progress() {
+    float snow_progress = clamp(global_snow_amount, 0.0, 1.0);
+
+    if (global_snow_start_time >= 0.0) {
+        float timed_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
+        snow_progress = max(snow_progress, timed_progress);
+    }
+    if (global_snow_melt_time >= 0.0) {
+        float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
+        snow_progress = min(snow_progress, 1.0 - melt);
+    }
+
+    return snow_progress;
+}
+
 void vertex() {
     vec3 instance_pos = MODEL_MATRIX[3].xyz;
 
@@ -88,24 +104,16 @@ void fragment() {
     vec2 shifted_uv = UV + texture_offset;
     vec4 tex = texture(alpha_texture, shifted_uv);
 
-    //// Snow accumulation
-    //float snow_amount = 0.0;
-    //if (global_snow_start_time >= 0.0) {
-        //snow_amount = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
-    //}
-    //if (global_snow_melt_time >= 0.0) {
-        //float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
-        //snow_amount *= (1.0 - melt);
-    //}
-//
-    //float top_mask = 1.0 - shifted_uv.y;
-    //float snow_mask = smoothstep(1.0 - snow_amount, 1.2 - snow_amount, top_mask);
-    //snow_mask *= step(0.01, snow_amount);
+    // Snow accumulation
+    float snow_amount = pow(get_snow_progress(), 0.55);
 
-    //vec3 dark_snow = global_snow_color.rgb * (1.0 - shadow_intensity);
-    //vec3 shaded_snow = mix(dark_snow, global_snow_color.rgb, v_shade_factor);
-    //vec3 final_albedo = mix(v_final_color, shaded_snow, snow_mask);
-	vec3 final_albedo = v_final_color;
+    float top_mask = 1.0 - shifted_uv.y;
+    float snow_mask = smoothstep(1.0 - snow_amount * 1.35, 1.08 - snow_amount * 1.35, top_mask) * snow_visibility;
+    snow_mask *= step(0.01, snow_amount);
+
+    vec3 dark_snow = global_snow_color.rgb * (1.0 - shadow_intensity);
+    vec3 shaded_snow = mix(dark_snow, global_snow_color.rgb, v_shade_factor);
+    vec3 final_albedo = mix(v_final_color, shaded_snow, snow_mask);
 	
     // Rain wetness: darken and make shinier
     float rain_int = clamp(global_rain_intensity, 0.0, 1.0);

core/daynight/water_ripple.gdshader

@@ -3,6 +3,12 @@ render_mode blend_mix, depth_draw_always;
 
 global uniform float global_rain_intensity;
 global uniform vec4 global_water_color = vec4(0.285, 0.534, 0.487, 1.0);
+global uniform float global_snow_start_time = -1.0;
+global uniform float global_snow_accumulation_speed = 0.005;
+global uniform float global_snow_melt_time = -1.0;
+global uniform float global_snow_melt_speed = 0.1;
+global uniform float global_snow_amount = 0.0;
+global uniform vec4 global_snow_color = vec4(0.92, 0.96, 1.0, 1.0);
 
 //Water color
 uniform vec4 deep_water_color : source_color = vec4(0.0, 0.1, 0.2, 1.0);
@@ -29,6 +35,21 @@ uniform sampler2D depth_texture : hint_depth_texture, filter_linear_mipmap;
 varying vec2 world_pos_xz;
 varying vec2 local_uv;
 
+float get_snow_progress() {
+	float snow_progress = clamp(global_snow_amount, 0.0, 1.0);
+
+	if (global_snow_start_time >= 0.0) {
+		float timed_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
+		snow_progress = max(snow_progress, timed_progress);
+	}
+	if (global_snow_melt_time >= 0.0) {
+		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
+		snow_progress = min(snow_progress, 1.0 - melt);
+	}
+
+	return snow_progress;
+}
+
 void vertex() {
 	world_pos_xz = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xz;
 	local_uv = UV;
@@ -82,8 +103,15 @@ void fragment() {
 	float is_sky = step(ref_depth_raw, 0.00001); // Protezione anti-cielo
 	reflection_mask *= (1.0 - is_sky);
 
-	vec3 final_rgb = mix(base_water.rgb, screen_ref, reflection_strength * reflection_mask);
+	float snow_progress = get_snow_progress();
+	float active_snowfall = step(0.0, global_snow_start_time) * (1.0 - step(0.0, global_snow_melt_time));
+	float reflection_snow_damping = max(smoothstep(0.0, 0.08, snow_progress), active_snowfall * 0.75);
+	float effective_reflection_strength = reflection_strength * (1.0 - reflection_snow_damping * 0.85);
+
+	vec3 final_rgb = mix(base_water.rgb, screen_ref, effective_reflection_strength * reflection_mask);
 	final_rgb = mix(final_rgb, ripple_color.rgb, ring * ripple_color.a);
+	float water_snow_amount = smoothstep(0.15, 1.0, snow_progress) * 0.18;
+	final_rgb = mix(final_rgb, global_snow_color.rgb, water_snow_amount);
 
 	ALBEDO = final_rgb;
 	

core/daynight/water_river.gdshader

@@ -0,0 +1,241 @@
+#define USE_CAUSTICS 1
+#define USE_REFRACTION 1
+#define USE_DISPLACEMENT 1
+#define USE_STYLIZED_LIGHTING 0
+#define USE_UNSHADED 0
+
+shader_type spatial;
+#if USE_UNSHADED
+	render_mode unshaded, depth_draw_never;
+#else
+	render_mode depth_draw_never;
+#endif
+
+uniform sampler2D DEPTH_TEXTURE: hint_depth_texture;
+
+group_uniforms Color;
+uniform vec4 surface_color : source_color = vec4(0.2,1.0,0.8,1.0);
+uniform vec4 depth_color : source_color = vec4(0.08,0.2,0.4,1.0);
+uniform vec4 foam_color : source_color = vec4(1.0);
+uniform float depth_size = 12.0;
+
+group_uniforms Roughness;
+uniform float surface_roughness : hint_range(0.0, 1.0, 0.01) = 0.05;
+uniform float foam_roughness : hint_range(0.0, 1.0, 0.01) = 0.05;
+
+#if USE_CAUSTICS
+	group_uniforms Caustics;
+	uniform sampler2D caustics_texture;
+	uniform float caustics_strength = 2.0;
+	uniform vec2 caustics_scale = vec2(0.5);
+#endif
+
+group_uniforms Wave;
+uniform sampler2D wave_texture;
+uniform float wave_softness : hint_range(0.0, 10.0, 0.1) = 3.0;
+uniform vec2 wave_scale = vec2(0.2);
+uniform vec2 wave_layer_scale = vec2(1.5);
+uniform float wave_highlight : hint_range(0.0, 1.0, 0.05) = 0.5;
+
+group_uniforms Wave.Motion;
+uniform vec2 wave_velocity = vec2(0.02);
+instance uniform vec2 river_flow_direction = vec2(0.0, 0.0);
+
+group_uniforms Foam;
+uniform sampler2D foam_texture;
+uniform float edge_foam_depth_size = 1.0;
+uniform float wave_foam_amount : hint_range(0.0, 1.0, 0.01) = 0.8;
+uniform float foam_start : hint_range(0.0, 1.0, 0.05) = 0.15;
+uniform float foam_end : hint_range(0.0, 1.0, 0.05) = 0.3;
+uniform float foam_exponent = 2.0;
+
+#if USE_REFRACTION
+	group_uniforms Refraction;
+	uniform float refraction_amount = 0.5;
+	uniform float refraction_exponent = 0.5;
+#endif
+
+#if USE_DISPLACEMENT
+	group_uniforms Displacement;
+	uniform float displacement_amount = 0.3;
+#endif
+
+#if USE_STYLIZED_LIGHTING && !USE_UNSHADED
+	group_uniforms Lighting;
+	uniform float diffuse_steps = 12.0;
+	uniform float diffuse_smoothness : hint_range(0.0, 1.0, 0.01) = 0.2;
+	uniform float specular_steps = 12.0;
+	uniform float specular_smoothness : hint_range(0.0, 1.0, 0.01) = 0.2;
+#endif
+
+uniform sampler2D screen_texture : hint_screen_texture;
+varying vec3 world_pos;
+varying vec2 world_wave_velocity;
+
+#if USE_CAUSTICS
+	vec3 sample_caustics(vec2 uv){
+		vec2 caustics_uv = uv * caustics_scale;
+		return vec3(
+			texture(caustics_texture, caustics_uv).r,
+			texture(caustics_texture, caustics_uv+vec2(0.02,0.02)).r,
+			texture(caustics_texture, caustics_uv+vec2(0.03,0.01)).r
+		);
+	}
+#endif
+
+vec4 sample_world_dpos(vec2 screen_uv, mat4 inv_proj_mat, mat4 inv_view_mat){
+	vec4 clip_pos = vec4(screen_uv * 2.0 - 1.0, texture(DEPTH_TEXTURE, screen_uv).r, 1.0);
+	vec4 view_pos = inv_proj_mat * clip_pos;
+	view_pos /= view_pos.w;
+	vec4 world_dpos = inv_view_mat * view_pos;
+	return world_dpos;
+}
+
+vec4 sample_wave(sampler2D tex, vec2 uv, vec2 velocity, float lod){
+	vec2 base_uv = uv * wave_scale;
+	vec2 wave_uv1 = (base_uv * wave_layer_scale) + (TIME * -velocity);
+	float wave1 = textureLod(tex, wave_uv1, lod).r;
+	
+	vec2 wave_uv2 = base_uv + (TIME * velocity);
+	vec4 wave2 = textureLod(tex, wave_uv2 - (wave1 * 0.1), lod);
+	
+	return wave2;
+}
+
+vec3 sample_wave_normal(vec2 uv, vec2 velocity, float center_wave) {
+	vec2 normal_offset = vec2(0.25, 0.0);
+	float wave_x = sample_wave(wave_texture, uv + normal_offset.xy, velocity, wave_softness).r;
+	float wave_z = sample_wave(wave_texture, uv + normal_offset.yx, velocity, wave_softness).r;
+	vec2 slope = vec2(center_wave - wave_x, center_wave - wave_z) * 0.35;
+	return normalize(vec3(slope, 1.0)) * 0.5 + 0.5;
+}
+
+vec2 get_world_wave_velocity(mat4 model_matrix) {
+	float velocity_length = length(wave_velocity);
+	if (velocity_length <= 0.0001) {
+		return vec2(0.0);
+	}
+
+	float flow_direction_length = length(river_flow_direction);
+	if (flow_direction_length > 0.0001) {
+		return (river_flow_direction / flow_direction_length) * velocity_length;
+	}
+
+	vec3 world_direction_3d = (model_matrix * vec4(0.0, 1.0, 0.0, 0.0)).xyz;
+	vec2 world_direction = world_direction_3d.xz;
+	float world_direction_length = length(world_direction);
+	if (world_direction_length <= 0.0001) {
+		return wave_velocity;
+	}
+
+	return (world_direction / world_direction_length) * velocity_length;
+}
+
+void vertex(){
+	world_pos = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
+	world_wave_velocity = get_world_wave_velocity(MODEL_MATRIX);
+	
+	#if USE_DISPLACEMENT
+		float wave = sample_wave(wave_texture, world_pos.xz, world_wave_velocity, wave_softness).r;
+		VERTEX.y += wave*displacement_amount;
+	#endif
+}
+
+void fragment() {
+	float wave = sample_wave(wave_texture, world_pos.xz, world_wave_velocity, wave_softness).r;
+	wave = smoothstep(0.0,1.0,wave);
+	
+	vec2 screen_uv = SCREEN_UV;
+	
+	// Refraction
+	#if USE_REFRACTION
+		screen_uv += ((pow(wave, refraction_exponent)*2.0 - 0.5) * 0.01 * refraction_amount);
+		
+		vec4 world_dpos = sample_world_dpos(screen_uv, INV_PROJECTION_MATRIX, INV_VIEW_MATRIX);
+		
+		float pre_depth = pow(clamp((world_dpos.y - world_pos.y + depth_size)/depth_size, 0.0, 1.0), 4.0);
+		screen_uv = mix(screen_uv, SCREEN_UV, pre_depth);
+		if(world_dpos.y - world_pos.y > 0.0){
+			screen_uv = SCREEN_UV;
+		}
+	#else
+		vec4 world_dpos = sample_world_dpos(screen_uv, INV_PROJECTION_MATRIX, INV_VIEW_MATRIX);
+	#endif
+	
+	world_dpos = sample_world_dpos(screen_uv, INV_PROJECTION_MATRIX, INV_VIEW_MATRIX);
+	
+	vec2 surface_uv = world_dpos.xz * 0.2;
+	
+	float depth = pow(clamp((world_dpos.y - world_pos.y + depth_size)/depth_size, 0.0, 1.0), 4.0);
+	
+	// Caustics
+	#if USE_CAUSTICS
+		vec3 caustics1 = sample_caustics(surface_uv + (TIME * -world_wave_velocity));
+		vec3 caustics2 = sample_caustics((surface_uv + (caustics1.r*0.05)) + (TIME * (world_wave_velocity*0.5)));
+		vec3 caustics = caustics2 * (1.0 - depth);
+	#endif
+	
+	// Edge Foam
+	float edge_foam_depth = clamp((world_dpos.y - world_pos.y + edge_foam_depth_size)/edge_foam_depth_size, 0.0, 1.0);
+	
+	// Wave Foam
+	float wave_foam = wave;
+	float foam = max(edge_foam_depth, wave_foam * wave_foam_amount);
+	
+	float foam_shape = 1.0 - texture(foam_texture, world_pos.xz* 0.5).r;
+	foam = clamp((foam - foam_start) / (foam_end - foam_start), 0.0, 1.0);
+	foam = clamp((foam - foam_shape) / (1.0 - foam_shape), 0.0, 1.0);
+	foam = pow(foam, foam_exponent);
+	
+	vec3 flat_color = mix(depth_color, surface_color, depth).rgb;
+	
+	vec4 screen = texture(screen_texture, screen_uv);
+	vec3 color = screen.rgb;
+	#if USE_CAUSTICS
+		color += vec3(pow(caustics * caustics_strength, vec3(2.0)));
+	#endif
+	color = mix(flat_color, color, 0.4 * depth);
+	color = mix(color, surface_color.rgb, wave * wave_highlight);
+	color = mix(color, foam_color.rgb, foam);
+	
+	#if !USE_UNSHADED
+		vec3 wave_normal_map = sample_wave_normal(world_pos.xz, world_wave_velocity, wave);
+		NORMAL_MAP = wave_normal_map;
+	#endif
+	
+	ROUGHNESS = mix(surface_roughness, foam_roughness, foam);
+	
+	ALBEDO = color;
+}
+
+#if USE_STYLIZED_LIGHTING && !USE_UNSHADED
+	void light(){
+		float ndotl = dot(NORMAL, LIGHT) * ATTENUATION;
+		//ndotl = smoothstep(0.0,1.0-ROUGHNESS,ndotl);
+		float light = ndotl;
+		
+		float light_mult = light * diffuse_steps;
+		float light_step_base = floor(light_mult);
+		float light_factor = light_mult - light_step_base;
+		
+		light_factor = smoothstep(0.5 - diffuse_smoothness * 0.5, 0.5 + diffuse_smoothness * 0.5, light_factor);
+		light = (light_step_base + light_factor) / diffuse_steps;
+		
+		DIFFUSE_LIGHT += (LIGHT_COLOR+ALBEDO) * light / PI;
+		
+		float roughness = mix(0.01, 0.99, ROUGHNESS);
+		vec3 h = normalize(VIEW + LIGHT);
+		float ndoth = clamp(dot(NORMAL, h), 0.0, 1.0) * ATTENUATION;
+		float specular = clamp(pow(ndoth, 16.0/(roughness)), 0.1, 0.99);
+		specular = mix(pow(specular, 2.0-roughness),0.00,pow(roughness, 0.1));
+		
+		float specular_mult = specular * specular_steps;
+		float specular_step_base = floor(specular_mult);
+		float specular_factor = specular_mult - specular_step_base;
+		
+		specular_factor = smoothstep(0.5 - specular_smoothness * 0.5, 0.5 + specular_smoothness * 0.5, specular_factor);
+		specular = (specular_step_base + specular_factor) / specular_steps;
+		
+		SPECULAR_LIGHT += (LIGHT_COLOR + ALBEDO) * specular;
+	}
+#endif

core/daynight/water_river.gdshader.uid

@@ -0,0 +1 @@
+uid://cb12c2j8rfu6a

core/daynight/weather_controller.gd

@@ -34,12 +34,15 @@ var rain_tween: Tween
 var rain_audio_tween: Tween
 var puddle_tween: Tween
 var puddle_amount: float = 0.0
+var clouds_tween: Tween
 
 var snow_tween: Tween
+var snow_weather_tween: Tween
 var snow_particles_tween: Tween
 var is_snowing: bool = false
 var is_snow_accumulated: bool = false 
 var actual_snow_amount: float = 0.0
+var snow_weather_amount: float = 0.0
 
 var is_storm: bool = false
 var cold_tween: Tween
@@ -188,10 +191,10 @@ func _process(delta: float) -> void:
 	var final_fog_density = lerp(base_fog_density, base_fog_density * 4.0, clamp(rain_intensity, 0.0, 1.0)) 
 	var final_water_color = base_water_color.darkened(clamp(environment_config.water_darkening_rain, 0.0, 1.0) * clamp(rain_intensity, 0.0, 1.0))
 
-	final_tint = final_tint.lerp(final_tint * environment_config.snow_mode_color, actual_snow_amount)
-	final_sky_top = final_sky_top.lerp(final_sky_top * environment_config.snow_mode_color, actual_snow_amount)
-	final_sky_horizon = final_sky_horizon.lerp(final_sky_horizon * environment_config.snow_mode_color, actual_snow_amount)
-	final_fog_color = final_fog_color.lerp(final_fog_color * environment_config.snow_mode_color, actual_snow_amount)
+	final_tint = final_tint.lerp(final_tint * environment_config.snow_mode_color, snow_weather_amount)
+	final_sky_top = final_sky_top.lerp(final_sky_top * environment_config.snow_mode_color, snow_weather_amount)
+	final_sky_horizon = final_sky_horizon.lerp(final_sky_horizon * environment_config.snow_mode_color, snow_weather_amount)
+	final_fog_color = final_fog_color.lerp(final_fog_color * environment_config.snow_mode_color, snow_weather_amount)
 	
 	#Shader parameters for global trunk_shader
 	var final_grad_top = base_grad_top.lerp(base_grad_top * weather_color, clamp(rain_intensity, 0.0, 1.0))
@@ -205,8 +208,8 @@ func _process(delta: float) -> void:
 	var night_val = clamp(day_time - 2.0, 0.0, 1.0)
 	
 	#Snow exposure compensation
-	var snow_light_attenuation = lerp(1.0, 0.55, actual_snow_amount * (1.0 - night_val))
-	var snow_glow_attenuation = lerp(1.0, 0.5, actual_snow_amount)
+	var snow_light_attenuation = lerp(1.0, 0.55, snow_weather_amount * (1.0 - night_val))
+	var snow_glow_attenuation = lerp(1.0, 0.5, snow_weather_amount)
 	var final_bloom = lerp(base_bloom, base_bloom * 0.5, rain_intensity) * snow_glow_attenuation
 	
 	# We calculate the final exposure by applying snow damping directly to the camera exposure
@@ -247,15 +250,36 @@ func _process(delta: float) -> void:
 			sky_mat.set_shader_parameter("sun_color", final_tint)
 			sky_mat.set_shader_parameter("night_intensity", night_val)
 			
+		var cloud_density_amount: float = maxf(clamp(rain_intensity, 0.0, 1.0), clamp(snow_weather_amount, 0.0, 1.0))
+		var current_cloud_density: float = lerp(environment_config.base_cloud_density, environment_config.rain_cloud_density, cloud_density_amount)
+		
 		if environment_config.material_clouds:
-			var current_density = lerp(0.4, 1.0, rain_intensity)
-			environment_config.material_clouds.set_shader_parameter("cloud_density", current_density)
-			var current_sharpness = lerp(0.14, 0.0, rain_intensity)
+			environment_config.material_clouds.set_shader_parameter("cloud_density", current_cloud_density)
+			var current_sharpness = lerp(0.14, 0.0, cloud_density_amount)
 			environment_config.material_clouds.set_shader_parameter("center_sharpness", current_sharpness)
+			
+		var env_shadow_mat = environment_shadows.get_surface_override_material(0) if environment_shadows else null
+		if env_shadow_mat:
+			env_shadow_mat.set_shader_parameter("cloud_density", current_cloud_density)
 		
 		if environment_config.material_fog:
+			environment_config.material_fog.set_shader_parameter("fog_color", final_fog_color)
+			environment_config.material_fog.set_shader_parameter("fog_density", clamp(final_fog_density * 25.0, 0.0, 1.0))
 			environment_config.material_fog.set_shader_parameter("night_intensity", night_val)
 			environment_config.material_fog.set_shader_parameter("sun_color", final_tint)
+		
+		if fog:
+			for child in fog.get_children():
+				var fog_mesh := child as MeshInstance3D
+				if fog_mesh == null:
+					continue
+				var fog_material := fog_mesh.get_surface_override_material(0) as ShaderMaterial
+				if fog_material == null:
+					continue
+				fog_material.set_shader_parameter("fog_color", final_fog_color)
+				fog_material.set_shader_parameter("fog_density", clamp(final_fog_density * 25.0, 0.0, 1.0))
+				fog_material.set_shader_parameter("night_intensity", night_val)
+				fog_material.set_shader_parameter("sun_color", final_tint)
 
 func create_sound_players():
 	rain_audio_player = AudioStreamPlayer.new()
@@ -666,7 +690,7 @@ func toggle_rain(value: bool):
 	
 	if puddle_tween and puddle_tween.is_valid():
 		puddle_tween.kill()
-	
+
 	if is_raining:
 		particles_rain.amount_ratio = 0.0
 		particles_rain.emitting = true
@@ -786,8 +810,23 @@ func toggle_snow(value: bool):
 	var target_snow_amount: float = 1.0 if is_snowing else 0.0
 	if snow_tween and snow_tween.is_valid():
 		snow_tween.kill()
+	if snow_weather_tween and snow_weather_tween.is_valid():
+		snow_weather_tween.kill()
+	var snow_amount_transition_duration: float = _get_snow_amount_transition_duration(is_snowing)
 	snow_tween = create_tween()
-	snow_tween.tween_method(init_snow_amount, actual_snow_amount, target_snow_amount, environment_config.snow_transaction_time)
+	snow_tween.tween_method(
+		init_snow_amount,
+		actual_snow_amount,
+		target_snow_amount,
+		snow_amount_transition_duration
+	)
+	snow_weather_tween = create_tween()
+	snow_weather_tween.tween_method(
+		init_snow_weather_amount,
+		snow_weather_amount,
+		target_snow_amount,
+		environment_config.snow_fade_time
+	)
 	_emit_weather_event_label()
 
 func _emit_weather_event_label() -> void:
@@ -811,6 +850,7 @@ func _emit_weather_event_label() -> void:
 #disable snow and set default values and shader
 func init_snow(value: float = 0.0):
 	actual_snow_amount = value
+	snow_weather_amount = value
 	RenderingServer.global_shader_parameter_set("global_snow_amount", value)
 	
 	if particles_snow:
@@ -835,6 +875,9 @@ func init_snow_amount(value: float):
 	actual_snow_amount = value
 	RenderingServer.global_shader_parameter_set("global_snow_amount", value)
 
+func init_snow_weather_amount(value: float):
+	snow_weather_amount = value
+
 func start_snow_accumulation() -> void:
 	RenderingServer.global_shader_parameter_set("global_snow_melt_time", -1.0)
 	RenderingServer.global_shader_parameter_set("global_snow_start_time", Time.get_ticks_msec() / 1000.0)
@@ -843,6 +886,18 @@ func start_snow_melt() -> void:
 	RenderingServer.global_shader_parameter_set("global_snow_melt_time", Time.get_ticks_msec() / 1000.0)
 	RenderingServer.global_shader_parameter_set("global_snow_melt_speed", environment_config.snow_melt_speed)
 
+func _get_snow_amount_transition_duration(is_accumulating: bool) -> float:
+	if environment_config == null:
+		return 0.0
+
+	var speed: float = environment_config.snow_melt_speed
+	if is_accumulating:
+		speed = environment_config.snow_accumulation_speed
+	if speed <= 0.0:
+		return environment_config.snow_transaction_time
+
+	return 1.0 / speed
+
 #endregion
 
 #region Post-Process

core/daynight/weather_overlay.gdshader

@@ -3,7 +3,7 @@ render_mode blend_mix, depth_draw_never;
 
 //Snow globals
 global uniform float global_snow_start_time        = -1.0;
-global uniform float global_snow_accumulation_speed = 0.1;
+global uniform float global_snow_accumulation_speed = 0.005;
 global uniform float global_snow_melt_time         = -1.0;
 global uniform float global_snow_melt_speed        = 0.1;
 global uniform float global_snow_amount            = 0.0;
@@ -72,18 +72,15 @@ float fbm(vec2 p) {
 }
 
 float get_snow_progress() {
-    bool has_snow_timeline = global_snow_start_time >= 0.0 || global_snow_melt_time >= 0.0;
     float snow_progress = clamp(global_snow_amount, 0.0, 1.0);
 
-    if (has_snow_timeline) {
-        snow_progress = 0.0;
-        if (global_snow_start_time >= 0.0) {
-            snow_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
-        }
-        if (global_snow_melt_time >= 0.0) {
-            float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
-            snow_progress *= (1.0 - melt);
-        }
+    if (global_snow_start_time >= 0.0) {
+        float timed_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
+        snow_progress = max(snow_progress, timed_progress);
+    }
+    if (global_snow_melt_time >= 0.0) {
+        float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
+        snow_progress = min(snow_progress, 1.0 - melt);
     }
 
     return snow_progress;
@@ -130,12 +127,13 @@ void fragment() {
     float snow_edge = smoothstep(
         global_snow_threshold - snow_edge_softness,
         global_snow_threshold + snow_edge_softness,
-        facing_up + (noise_val - 0.5) * 0.4
+        facing_up
     );
     float flat_accumulation = smoothstep(0.0, 0.35, v_snow_cap_mask) * snow_accumulation;
-    float snow_coverage = smoothstep(0.0, 0.6, noise_val + snow_progress - 0.4 + flat_accumulation * 0.25);
-    float snow_factor = max(snow_edge * snow_coverage * snow_progress, flat_accumulation);
-    float snow_opacity = smoothstep(0.04, 0.28, snow_factor);
+    float snow_variation = mix(0.75, 1.15, noise_val);
+    float snow_coverage = clamp(snow_progress * snow_variation + flat_accumulation * 0.25, 0.0, 1.0);
+    float snow_factor = max(snow_edge * snow_coverage, flat_accumulation);
+    float snow_opacity = clamp(snow_factor, 0.0, 1.0);
     snow_opacity = max(snow_opacity, flat_accumulation * 0.9);
 
     float shade = mix(-snow_color_variation, snow_color_variation, noise_val);

core/daynight/weather_plain_shader.gdshader

@@ -2,10 +2,11 @@ shader_type spatial;
 render_mode blend_mix, depth_draw_never, cull_disabled;
 
 // Snow globals
-global uniform float global_snow_start_time;
-global uniform float global_snow_accumulation_speed;
-global uniform float global_snow_melt_time;
-global uniform float global_snow_melt_speed;
+global uniform float global_snow_start_time = -1.0;
+global uniform float global_snow_accumulation_speed = 0.005;
+global uniform float global_snow_melt_time = -1.0;
+global uniform float global_snow_melt_speed = 0.1;
+global uniform float global_snow_amount = 0.0;
 global uniform vec4  global_snow_color;
 uniform float snow_edge_softness : hint_range(0.01, 0.5) = 0.15;
 uniform float snow_color_variation : hint_range(0.0, 0.15) = 0.05;
@@ -34,6 +35,21 @@ float ripple_ring(vec2 uv, float time_offset) {
 	return ring * fade;
 }
 
+float get_snow_progress() {
+	float snow_progress = clamp(global_snow_amount, 0.0, 1.0);
+
+	if (global_snow_start_time >= 0.0) {
+		float timed_progress = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
+		snow_progress = max(snow_progress, timed_progress);
+	}
+	if (global_snow_melt_time >= 0.0) {
+		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
+		snow_progress = min(snow_progress, 1.0 - melt);
+	}
+
+	return snow_progress;
+}
+
 void fragment() {
 	vec3 world_pos = (INV_VIEW_MATRIX * vec4(VERTEX, 1.0)).xyz;
 
@@ -41,18 +57,10 @@ void fragment() {
 	float facing_up = 1.0;
 
 	// Snow accumulation
-	float snow_amount = 0.0;
-	if (global_snow_start_time >= 0.0) {
-		snow_amount = clamp((TIME - global_snow_start_time) * global_snow_accumulation_speed, 0.0, 1.0);
-	}
-	if (global_snow_melt_time >= 0.0) {
-		float melt = clamp((TIME - global_snow_melt_time) * global_snow_melt_speed, 0.0, 1.0);
-		snow_amount *= (1.0 - melt);
-	}
+	float snow_amount = get_snow_progress();
 
-	// UV-based snow mask: accumulates from the top of the quad
-	float top_mask = 1.0 - UV.y;
-	float snow_mask = smoothstep(1.0 - snow_amount, 1.0 - snow_amount + snow_edge_softness, top_mask);
+	// Plain surfaces fade in uniformly to avoid patchy strip-like accumulation.
+	float snow_mask = smoothstep(0.0, 1.0, snow_amount);
 	snow_mask *= step(0.01, snow_amount);
 
 	// Snow color with slight variation

core/environment_config.gd

@@ -98,6 +98,7 @@ extends Resource
 @export var material_fog: ShaderMaterial #Fog overlay shader material
 @export var material_drops: StandardMaterial3D #Rain drops material (albedo tinted by sky)
 @export var material_clouds: ShaderMaterial #Cloud layer shader material
+@export var base_cloud_density: float = 0.4 #default cloud density
 
 #Rain weather settings
 @export_group("Rain")
@@ -106,6 +107,7 @@ extends Resource
 @export var rain_audio_volume_db: float = -10.0 #Target rain loop volume in decibels
 @export var puddle_form_time: float = 15.0 #Seconds for puddles to fully form
 @export var puddle_dry_time: float = 20.0 #Seconds for puddles to fully dry after rain stops
+@export var rain_cloud_density: float = 1.0 #the cloud density when is rainy
 
 #Storm settings (applied on top of rain when storm is active)
 @export_group("Storm")
@@ -136,7 +138,7 @@ extends Resource
 
 #Train start settings
 @export_group("Train Start")
-@export var train_start_from_random_position: bool = false #When enabled the train starts from a random offset on the rail curve instead of a stop
+@export var train_start_from_random_position: bool = true #When enabled the train starts from a random offset on the rail curve instead of a stop
 @export_range(0, 64, 1, "or_greater") var train_start_stop_index: int = 1 #Stop index used for the train start when random start is disabled
 
 #Snow settings
@@ -145,7 +147,7 @@ extends Resource
 @export var snow_transaction_time: float = 10.0 #Seconds for snow shader to fully transition in/out
 @export var snow_fade_time: float = 5.0 #Seconds for snow particles to fade in/out
 @export var snow_threshold: float = 0.4 #Normal Y threshold for snow accumulation on surfaces
-@export var snow_accumulation_speed: float = 0.014 #Accumulation speed: 0.1 -> 10s, 0.05 -> 20s, 0.02 -> 50s, 0.012 -> ~83s
+@export var snow_accumulation_speed: float = 0.005 #Accumulation speed: 0.005 -> ~200s, 0.01 -> 100s, 0.02 -> 50s
 @export var snow_melt_speed: float = 0.05 #Speed at which accumulated snow melts away
 @export var show_snow_accumulation_volume: bool = true #Enables vertex snow buildup; when false snow only changes surface color
 @export var snow_max_accumulation: float = 0.25 #Maximum accumulated snow factor applied to coverage and thickness

core/game_menu/arrow_button.gd

@@ -0,0 +1,29 @@
+@tool
+extends Control
+
+class_name ArrowButton
+
+signal on_pressed
+
+@export var image: Texture:
+	set(value):
+		image = value
+		if is_inside_tree() and has_node("%Texture"):
+			$%Texture.texture = image
+
+@export var flip_h: bool = false:
+	set(value):
+		flip_h = value
+		if is_inside_tree() and has_node("%Texture"):
+			if $%Texture != null:
+				$%Texture.flip_h = flip_h
+
+func _ready():
+	if image != null and has_node("%Texture"):
+		$%Texture.texture = image
+		$%Texture.flip_h = flip_h
+		
+
+func _on_gui_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT and event.pressed:
+		on_pressed.emit()

core/game_menu/arrow_button.gd.uid

@@ -0,0 +1 @@
+uid://3uxuhvua1036

core/game_menu/arrow_button.tscn

@@ -0,0 +1,38 @@
+[gd_scene format=3 uid="uid://dm3skv22c60tm"]
+
+[ext_resource type="Texture2D" uid="uid://cm7fok7lhrano" path="res://core/game_menu/assets/page_1/freccetta.png" id="1_vbu0v"]
+[ext_resource type="Script" uid="uid://3uxuhvua1036" path="res://core/game_menu/arrow_button.gd" id="2_xq7pl"]
+[ext_resource type="PackedScene" uid="uid://dxun0jk5t0n6" path="res://core/game_menu/hoover_tween.tscn" id="3_hu4cn"]
+
+[node name="ArrowButton" type="Control" unique_id=1696751730]
+custom_minimum_size = Vector2(101, 124)
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+pivot_offset = Vector2(0.5, 0.5)
+script = ExtResource("2_xq7pl")
+image = ExtResource("1_vbu0v")
+
+[node name="Texture" type="TextureRect" parent="." unique_id=91599097]
+unique_name_in_owner = true
+layout_mode = 1
+anchors_preset = -1
+anchor_left = 0.47369793
+anchor_top = 0.4425926
+anchor_right = 0.5263021
+anchor_bottom = 0.5574074
+grow_horizontal = 2
+grow_vertical = 2
+pivot_offset_ratio = Vector2(0.5, 0.5)
+mouse_filter = 2
+texture = ExtResource("1_vbu0v")
+metadata/_edit_use_anchors_ = true
+
+[node name="HooverTween" parent="." unique_id=2115829120 node_paths=PackedStringArray("detector_node", "visual_node") instance=ExtResource("3_hu4cn")]
+detector_node = NodePath("..")
+visual_node = NodePath("../Texture")
+
+[connection signal="gui_input" from="." to="." method="_on_gui_input"]

core/game_menu/assets/page_1/chooseyourbiome_text.png.import

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core/game_menu/assets/page_1/chooseyourtrain_text.png.import

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+
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+mipmaps/generate=false
+mipmaps/limit=-1
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+roughness/src_normal=""
+process/channel_remap/red=0
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core/game_menu/assets/page_1/color_dx_biome.png.import

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core/game_menu/assets/page_1/color_main_biome.png.import

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core/game_menu/assets/page_1/color_sx_biome.png.import

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core/game_menu/assets/page_1/customizecolor-1.png.import

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