add snow management for materials

core/daynight/environment_manager.gd

@@ -29,6 +29,11 @@ var day_time: float = 0.0
 
 func _ready() -> void:
 	
+	#set noise texture 2d to materials in special group
+	ApplyWindNoiseToMaterials()
+	#set snow shader to materials in special group
+	ApplySnowShaderToMaterials()
+		
 	if day_night_controller == null:
 		day_night_controller = DayNightController.new(
 			environment_config
@@ -56,6 +61,24 @@ func _ready() -> void:
 		weather_controller.name = "WeatherController"
 		add_child(weather_controller)
 
+func ApplyWindNoiseToMaterials():
+	var noise_tex = preload("res://core/daynight/noise.tres")
+	for node in get_tree().get_nodes_in_group("wind_materials"):
+		if node is GeometryInstance3D:
+			node.material_override.set_shader_parameter("wind_noise", noise_tex)
+			
+func ApplySnowShaderToMaterials():
+	var snow_shader = preload("res://core/daynight/snow_overlay.tres")
+
+	#apply to node and childs
+	for node in get_tree().get_nodes_in_group("snow_materials"):
+		if node is GeometryInstance3D:
+			node.material_overlay = snow_shader
+		else:
+			for child in node.get_children():
+				if child is GeometryInstance3D:
+					child.material_overlay = snow_shader
+			
 func select_day_time(normalized_time: float) -> void:
 	# 0.0→0.25  = alba:       day_time 1.0→2.0 (night colors → morning colors)
 	# 0.25→0.5  = giorno:     day_time 2.0→2.0 (stays morning/afternoon)