Access gameobjects properties from collider

Question

So I have a missile. When it hits its target the missile explodes.
The explosion has a radius, inside which may be many enemies.
The enemies have a "scripted/public variable" explosionPrefab.
I find all the enemies using colliders in MissileMove class:

Collider[] colliders = Physics.OverlapSphere( transform.position, explosionRadius );
    foreach (Collider coli in colliders)
        if (coli.tag == "Enemy")
            Damage( coli.gameObject);

How do I access the enemies' explosionPrefabs via their transforms ?

EDIT - after reading...

My problem was that the explosionPrefab (enemyMove class) was defined as a Transform. It is now a GameObject. And it works : )

However, instantiating the explosion throws an "invalidCastException" and exits the function. The explosion runs (!), but the rest of the function is skipped - the enemy survives!

But if I "attach" the same explosionPrefab to the local script (MissileMove), and use that in stead, it runs normally (no exception thrown) - what's the difference?

void Damage( GameObject enemy )
{
    GameObject exp = enemy.GetComponent<EnemyMove>().explosionPrefab;

    Debug.Log("Start EnemyExplosion");

    // Below throws exception, runs, then quits function
    GameObject explosion = Instantiate( exp, enemy.transform.position, enemy.transform.rotation);

    // Below runs perfectly
    GameObject explosion = Instantiate( enemyExplosion, enemy.transform.position, enemy.transform.rotation);

    Destroy(explosion, 2f);

    Debug.Log("EnemyExplosion startet");

    Destroy(enemy);
}

Exception:

InvalidCastException: Specified cast is not valid.
(wrapper castclass) System.Object.__castclass_with_cache(object,intptr,intptr)
UnityEngine.Object.Instantiate[T] (T original, UnityEngine.Vector3 position, UnityEngine.Quaternion rotation) (at
C:/buildslave/unity/build/Runtime/Export/Scripting/UnityEngineObject.bindings.cs:276)
BulletMove.Damage (UnityEngine.GameObject enemy) (at Assets/Scripts/BulletMove.cs:60)
BulletMove.HitTarget () (at Assets/Scripts/BulletMove.cs:49)
BulletMove.Update () (at Assets/Scripts/BulletMove.cs:26)

Not quite clear what you're asking ... you want `coli.gameObject` ? or `coli.transform.gameObject` (basically the same but the first is one API call less). Or use `coli.GetComponent().explosionPrefab` — derHugo, Sep 12 '19 at 11:42
maybe start here https://unity3d.com/de/learn/tutorials/topics/scripting/getcomponent — derHugo, Sep 12 '19 at 11:55
What is the difference between `enemyExplosion` and `exp`? Is the exception throw in this line? Or do they maybe have some components attached where it happens? Could you post the complete exception output? — derHugo, Sep 12 '19 at 16:16

score 0 · Answer 1 · answered Sep 12 '19 at 13:17

0

You can use GetComponentInChildren or GetComponent in your enemies when using the Physics.OverlapSphere and then get from that class the respective explosion.

answered Sep 12 '19 at 13:17

Horothenic

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Access gameobjects properties from collider

1 Answers1