func _unhandled_input(event):
	if event is InputEventMouseMotion:
		set_quaternion(
			Quaternion(
				Vector3.UP,
				SENSITIVITY * -event.relative.x)
			* quaternion)

		var new_rotation = Quaternion(
			Vector3.UP,
			SENSITIVITY * -event.relative.x)
		var current_euler = quaternion.get_euler()
		var new_euler = Vector3(
			current_euler.x,
			current_euler.y + SENSITIVITY * -event.relative.x,
			current_euler.z)

		set_quaternion(Quaternion.from_euler(new_euler))

		var head_euler = head.quaternion.get_euler()
		head_euler.x = clamp(head_euler.x + SENSITIVITY * -event.relative.y, deg_to_rad(-40), deg_to_rad(60))

		head.set_quaternion(Quaternion.from_euler(head_euler))