The object of type 'Rigidbody' has been destroyed but you are still trying to access it.

Question

I have a basic missile launcher set up. The collision works fine, the explosion animation plays when the missile collides with somet$$anonymous$$ng, and then it gets destroyed. The only problem is, I can't shoot any more missiles after the first one!

I have a prefab named "missile" with a rigidbody attached, w$$anonymous$$ch is associated with the projectile variable from MissileLauncher. Is there another way to instantiate a new projectile after destroying the previous gameObject?

 public class MissileLauncher : MonoBehaviour
 {
     public Rigidbody projectile;
     int speed = 20;
  
     void Update ()
     {
         if (Input.GetButtonDown("Fire1"))
         { 
             projectile = (Rigidbody)Instantiate(projectile, transform.position, transform.rotation); //Instantiate projectile
             projectile.velocity = transform.TransformDirection(new Vector3(0,0,speed)); //Set projectile velocity
  
             Physics.IgnoreCollision(projectile.collider, transform.root.collider); //Avoid projectile an hero
         }
     }
 }

 public class Projectile : MonoBehaviour
 {
     public GameObject explosion;
  
     void OnCollisionEnter(Collision collision)
     {
         ContactPoint contact = collision.contacts[0];
         transform.rotation = Quaternion.FromToRotation (Vector3.up, contact.normal);
  
         explosion = (GameObject)Instantiate(explosion, contact.point, transform.rotation);
  
         Destroy(gameObject);
     }
 }

 public class Explosion : MonoBehaviour
 {
     float explosionTime = 0.25f;
  
     void Start ()
     {
         Destroy (gameObject, explosionTime);
     }
 }

Answer 1

Best Answer

Answer by Bunny83 · Aug 07, 2012 at 12:32 AM

Instantiate will return the object it instantiates. You overwrite your original prefab reference with your instance. When t$$anonymous$$s instance get destroyed you don't have any source object you can Instantiate.

So, just do it like t$$anonymous$$s:

     // [...]
     if (Input.GetButtonDown("Fire1"))
     {
         Rigidbody clone = (Rigidbody)Instantiate(projectile, transform.position, transform.rotation);
         clone.velocity = transform.TransformDirection(new Vector3(0,0,speed));
         Physics.IgnoreCollision(clone.collider, transform.root.collider);
     }
     // [...]

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Aunt Jemima · Aug 07, 2012 at 12:48 AM 0

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That does it, thanks!

Answer 2

I don't have experiente with C# but from what I see, you are trying to acces the same object that you destroy in the Projectile script.Try t$$anonymous$$s : declare a new variable to hold a reference of the instantiated projectile ( you are using the same identifier, "projectile" for the projectile prefab that you instantiate, and also for the variable that holds the reference to that new instance).

public class MissileLauncher : MonoBehaviour { public Rigidbody projectile; public Rigidbody spawnedProjectile; int speed = 50;

 void Update ()
 {
     if (Input.GetButtonDown("Fire1"))
     { 
         spawnedProjectile = (Rigidbody)Instantiate(projectile, transform.position, transform.rotation); //Instantiate projectile
         spawnedProjectile.velocity = transform.TransformDirection(new Vector3(0,0,speed)); //Set projectile velocity

         Physics.IgnoreCollision(spawnedProjectile.collider, transform.root.collider); //Avoid projectile an hero
     }
 }

}

T$$anonymous$$s should work for you.

The object of type 'Rigidbody' has been destroyed but you are still trying to access it.

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