rename _push_outwards to _push_radial

scripts/game_key.gd

@@ -342,29 +342,27 @@ func _animate_position() -> Vector3:
 
 
 func _shake(force: float) -> void:
-	_pos_sod.set_y(
-		(
-			position
-			+ (
-				Vector3(
-					randf_range(-force, force),
-					randf_range(-force, force),
-					randf_range(-force, force)
-				)
-				* _keyboard.key_size
+	_pos_sod.y = (
+		_pos_sod.y
+		+ (
+			Vector3(
+				randf_range(-force, force),
+				randf_range(-force, force),
+				randf_range(-force, force)
 			)
+			* _keyboard.key_size
 		)
 	)
 
 
 func _push(force: Vector3) -> void:
-	_pos_sod.set_y(position + force * _keyboard.key_size)
+	_pos_sod.y = (_pos_sod.y + force * _keyboard.key_size)
 
 
-func _push_outwards(force: float) -> void:
-	_pos_sod.set_y(
-		Vector3(position.x * (force + 1), position.y, position.z * (force + 1))
-	)
+func _push_radial(force: float) -> void:
+	_pos_sod.y = (Vector3(
+		_pos_sod.y.x * (force + 1), _pos_sod.y.y, _pos_sod.y.z * (force + 1)
+	))
 
 
 func _animate_light(delta: float) -> void:
@@ -411,9 +409,10 @@ func _on_keyboard_keys_requested(filter_func: Callable) -> void:
 
 func _on_keyboard_is_configuring_changed(value: bool) -> void:
 	if value:
-		_push_outwards(0.2)
+		_push_radial(0.2)
 	else:
 		_shake(0.2)
+		_push_radial(-0.05)
 
 
 func _on_keyboard_player_key_changed(game_key: GameKey) -> void:

scripts/second_order_dynamics.gd

@@ -2,6 +2,8 @@
 # https://www.youtube.com/watch?v=KPoeNZZ6H4s
 class_name SecondOrderDynamics
 
+var y: Vector3
+
 var _k1: float
 var _k2: float
 var _k3: float
@@ -11,7 +13,6 @@ var _z: float
 var _d: float
 
 var _xp: Vector3
-var _y: Vector3
 var _yd: Vector3
 
 
@@ -29,7 +30,7 @@ func _init(fzr: Vector3, x0: Vector3) -> void:
 	_k3 = r * z / _w
 
 	_xp = x0
-	_y = x0
+	y = x0
 	_yd = Vector3.ZERO
 
 
@@ -46,10 +47,7 @@ func process(t: float, x: Vector3, xd: Vector3 = Vector3.INF) -> Vector3:
 		var beta := t1 * t1
 		var t2 := t / (1 + beta - alpha)
 		k2_stable = t * t2
-	_y = _y + t * _yd
-	_yd = _yd + t * (x + _k3 * xd - _y - _k1 * _yd) / k2_stable
-	return _y
+	y = y + t * _yd
+	_yd = _yd + t * (x + _k3 * xd - y - _k1 * _yd) / k2_stable
+	return y
 
-
-func set_y(y: Vector3) -> void:
-	_y = y