New Enemy Type: Rusher

Get too close and this enemy will ram the player

In this article we create a new enemy type: rusher. This enemy will detect if the player gets close and will start chasing the player down. The player can use the thrusters/sprint or the wrap around mechanic to lose the rusher.

New Enemy Type: Rusher

Rusher type Enemy Behaviour Pseudocode

If distance to player is less then minimum distance
then start rushing towards the player
and change rotation based on the move direction

else move down straight
and change rotation based on the move direction

Actual Code

Created necessary variables and a handle to the player:

private GameObject _player;
    [SerializeField] private float _speed = 2f;
    [SerializeField] private float _minDistance = 4f;
    private float _rushSpeed = 4f;
    private Vector3 _targetPos;
    private Vector2 _direction; 

    // Start is called before the first frame update
    void Start()
    {
        _player = GameObject.FindGameObjectWithTag("Player");
        if (_player == null)
        {
            Debug.LogError("EnemyAttackRush.player is NULL");
        }
    }

We used the Vector3.Distance function to detect if the player got close to the rusher.

Vector3.Distance

To move towards our target (player) we used Vector3.MoveTowards

Vector3.MoveTowards

void Update()
    {
        if (Vector3.Distance(transform.position, _player.transform.position) <= _minDistance)
        {
            _targetPos = _player.transform.position;
            transform.position = Vector3.MoveTowards(transform.position, _targetPos, _rushSpeed * Time.deltaTime);
            //change direction to movement direction
            _direction = (transform.position - _targetPos).normalized;       
                float angle = Mathf.Atan2(_direction.y, _direction.x) * Mathf.Rad2Deg;
                transform.rotation = Quaternion.AngleAxis(angle + 270f, Vector3.forward);
        }
        else
        {
            transform.Translate(Vector3.down * _speed * Time.deltaTime);
            transform.rotation = Quaternion.Euler(0,0,0);
        }
    }

To change the rotation when we are going straight down we just used a fixed angle.