koobas.hobune.stream
Area of Effect (AoE) Stun Issue
I've tried to create a trigger which causes an area of effect stun towards my enemies. This is what I got so far.
private void OnTriggerEnter2D(Collider2D other)
{
if(other.gameObject.tag == "Enemy")
{
Collider2D[] enemies = Physics2D.OverlapCircleAll(transform.position, 10, 1 << LayerMask.NameToLayer("Foreground"));
foreach(Collider2D en in enemies)
{
Rigidbody2D rb = GetComponent<Rigidbody2D>();
EnemyBehaviour stun = rb.GetComponent<EnemyBehaviour>();
stun.EnemyStunned();
}
Destroy(this.gameObject);
}
}
I get this error: NullReferenceException: Object reference not set to an instance of an object HunterTrapBehaviour.OnTriggerEnter2D (UnityEngine.Collider2D other) (at Assets/RPG Project - R&T/_Scripts/HunterTrapBehaviour.cs:19)
On line 10 of the code you posted, you are setting rb to the value of GetComponent. GetComponent will try to return a Component on the GameObject you run it on. You probably need to try Rigidbody2D rb = en.GetComponent<Rigidbody2D>();
Also, you are assuming that rb is not null. You probably should check for that possibility before trying to get your EnemyBehaviour script. And before you try to call EnemyStunned(), you might want to be sure that stun is not null as well.
Even though you are checking for a tag for the Collider passed into OnTriggerEnter2D, you still need to check if those Components exist because OverlapCircleAll is returning an array of all Colliders in a radius. This array is unrelated to the one Collider you already checked. So, the Colliders being returned might not all be enemies.
Thank you! I can't believe I missed that. For anyone dealing with a similar issue in the future this is the working script.
private void OnTriggerEnter2D(Collider2D other)
{
if(other.gameObject.tag == "Enemy")
{
Collider2D[] enemies = Physics2D.OverlapCircleAll(transform.position, 10, 1 << LayerMask.NameToLayer("Foreground"));
foreach(Collider2D en in enemies)
{
Rigidbody2D rb = en.GetComponent<Rigidbody2D>();
if(rb != null && rb.tag == "Enemy")
{
EnemyBehaviour stun = rb.GetComponent<EnemyBehaviour>();
stun.EnemyStunned();
}
}
Destroy(this.gameObject);
}
}
