first commit

Scripts/FoliageArea.gd

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+extends Area3D
+
+var collider_audio_pair = []
+
+@export var rustle_sounds: PackedScene
+@export var placeholder: CollisionShape3D
+
+const VELOCITY_ATTENUATION_THRESHOLD = 3.0
+const ATTENUATION_ADJUST_SPEED = 200.0
+const FADE_IN_OUT = 0.15
+
+@onready var rustle_sounds_loaded = load(rustle_sounds.resource_path)
+
+func _ready():
+	placeholder.queue_free()
+	var colliders = find_children("*", "CollisionShape3D", true)
+	for collider in colliders:
+		collider.reparent(self, true)
+	
+	body_entered.connect(_on_body_entered)
+	body_exited.connect(_on_body_exited)
+
+func _physics_process(delta):
+	for pair in collider_audio_pair:
+		pair["audio"].global_position = pair["collider"].global_position
+		var atten_speed = ATTENUATION_ADJUST_SPEED * delta
+		var atten_target = set_atten(pair["collider"], pair["audio"], true)
+		if pair["audio"].volume_db > atten_target:
+			atten_speed = atten_speed / 3.0
+		pair["audio"].volume_db = move_toward(pair["audio"].volume_db, atten_target, atten_speed)
+
+# should change to get_atten sometime
+func set_atten(phys_obj, audio, get_vol := false):
+	var collider_velocity
+	if phys_obj is CharacterBody3D:
+		collider_velocity = phys_obj.get_real_velocity().length()
+	else:
+		if phys_obj.linear_velocity.length() > phys_obj.angular_velocity.length():
+			collider_velocity = phys_obj.linear_velocity.length()
+		else:
+			collider_velocity = phys_obj.angular_velocity.length()
+	
+	var rustle_atten = collider_velocity/VELOCITY_ATTENUATION_THRESHOLD
+	rustle_atten = clamp(rustle_atten, 0.0, 1.0)
+	
+	var vol = lerp(-80.0, 0.0, ease_out_circ(rustle_atten))
+	if get_vol:
+		return vol
+	else:
+		audio.volume_db = vol
+
+func _on_body_entered(body):
+	if body is RigidBody3D or CharacterBody3D:
+		var rustle_sounds = rustle_sounds_loaded.instantiate()
+		get_tree().root.get_child(0).add_child(rustle_sounds)
+		
+		# is this fade in necessary? the move_towards behavior should already act as its own fade in right? only fade out is necessary due to abrupt deletion without it?
+		var target_vol = set_atten(body, rustle_sounds, true)
+		var fade_time = FADE_IN_OUT
+		while fade_time > 0.0:
+			rustle_sounds.global_position = body.global_position
+			rustle_sounds.volume_db = lerp(-80.0, target_vol, (FADE_IN_OUT-fade_time)/FADE_IN_OUT)
+			await get_tree().process_frame
+			fade_time -= get_process_delta_time()
+		
+		if overlaps_body(body):
+			# this check sometimes fails because godot doesn't guarantee up to date results
+			# so sometimes you'll get the bug where the foliage noise keeps on playing after you get out of foliage
+			# i'm too tired to fix this, this script is bloated enough as it is
+			# interestingly enough i've run into this bug in other AAA games as well
+			collider_audio_pair.append({"collider": body, "audio": rustle_sounds})
+		else:
+			var from_vol = set_atten(body, rustle_sounds, true)
+			var fade_time2 = FADE_IN_OUT
+			while fade_time2 > 0.0:
+				rustle_sounds.global_position = body.global_position
+				rustle_sounds.volume_db = lerp(from_vol, -80.0, (FADE_IN_OUT-fade_time2)/FADE_IN_OUT)
+				await get_tree().process_frame
+				fade_time2 -= get_process_delta_time()
+			rustle_sounds.queue_free()
+
+func _on_body_exited(body):
+	for pair in collider_audio_pair:
+		if pair["collider"] == body:
+			var temp_audio = pair["audio"]
+			var temp_obj = pair["collider"]
+			collider_audio_pair.erase(pair)
+			
+			var from_vol = set_atten(body, rustle_sounds, true)
+			var fade_time = FADE_IN_OUT
+			while fade_time > 0.0:
+				temp_audio.global_position = temp_obj.global_position
+				temp_audio.volume_db = lerp(from_vol, -80.0, (FADE_IN_OUT-fade_time)/FADE_IN_OUT)
+				await get_tree().process_frame
+				fade_time -= get_process_delta_time()
+			
+			temp_audio.queue_free()
+			break
+
+func ease_out_circ(lerp: float) -> float:
+	return sqrt(1.0 - pow(lerp - 1.0, 2.0))