1

So, i have a 2D zombie character that checks his facing direction using raycast and detecting using 4 different colliders around the raycast’s starting point. The problem is when I instantiate the prefab, it gave me a null reference to the collider detection method which I created. The script is:

void checkDirection(Vector2 direction, Transform transform)
{

    RaycastHit2D directionHit = Physics2D.Raycast(transform.position, direction * 10);
    if (directionHit.collider.name == "left_Colliders")
    {
        attackDirection = 3;
        faceDirection = 3;
    }
    if (directionHit.collider.name == "right_Collider")
    {
        attackDirection = 4;
        faceDirection = 4;
    }
    if (directionHit.collider.name == "up_Collider")
    {
        attackDirection = 1;
        faceDirection = 1;
    }
    if (directionHit.collider.name == "down_Collider")
    {
        attackDirection = 2;
        faceDirection = 2;
    }
}
private void Update()
{
    checkDirection(direction, this.transform);

}

which was called in the update function.

The code above was attached to my zombie main game object. There is one child collider containing 4 other child colliders to detect the 4 sides named left_colliders, right_colliders… so on.

The directions work fine. I have an empty game object with spawning enemy script attached to it:

public GameObject enemyPrefab;

public float full_range = 50f;

private Transform player;

private float playerMinX;
private float playerMaxX;
private float playerMinY;
private float playerMaxY;

private Vector3 playerPosition;

public float randomX;
public float randomY;

void Start()
{
    player = GameObject.Find("Player").transform;
}

void Update()
{
    playerMinX = player.position.x - full_range / 2;
    playerMaxX = player.position.x + full_range / 2;
    playerMinY = player.position.y - full_range / 2;
    playerMaxY = player.position.y + full_range / 2;

    randomX = Random.Range(playerMinX, playerMaxX);
    randomY = Random.Range(playerMinY, playerMaxY);

    playerPosition = new Vector3(randomX, randomY, 0);

    Vector3 viewPosition = Camera.main.WorldToViewportPoint(this.gameObject.transform.position);
    if (randomX > viewPosition.x + 1 && randomY > viewPosition.y + 1)
    {
        Instantiate(enemyPrefab, playerPosition, Quaternion.identity);
    }

}

}

(ignore the fact that it is spawning every frame per second, I will fix that later this is just a test)
the script above is the script spawning my enemies around my character.

Everytime I start the game, it spawns the enemies correctly and the facing directions work just fine, however it only gives me 13-21 null reference error after those numbers, it stopped giving me the errors despite the game still spawning more in.

2

Nvm, all i had to do was call the method in the fixedupdate instead of update.