private void Awake()
{
matchmanager = FindObjectOfType<MatchManager>();
if (matchmanager == null) Debug.LogError("MatchManager not found");
matchmanager.RegisterBall(this);
// start pos (set by first ball)
if (start_pos == null) start_pos = transform.position;
else transform.position = (Vector2)start_pos;
// other
camshake = Camera.main.GetComponent<CameraShake>();
ball_audio = GetComponentInChildren<BallAudio>();
}
