3D.ru

[SerializeField] private Vector3 moveDirection;
    private Rigidbody[] _player;

    private void Start()
    {
        _player = FindObjectsOfType<Rigidbody>();
    }
    private void FixedUpdate()
    {
        OnButtonLeft();
        OnButtonRight();
    }
    public void OnButtonLeft()
    {
        _player.GetComponent<Rigidbody>().velocity += moveDirection;
    }
    public void OnButtonRight()
    {
        _player.GetComponent<Rigidbody>().velocity -= moveDirection;
    }

foreach (var rb in _player)
    rb.velocity -= moveDirection;