Question by carlegos · Aug 30, 2019 at 12:49 AM · instantiate exception

I keep getting the Error InvalidCastExceptio and I cant seem to fix it!

I keep getting the Error 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/UnityEngineObject.bindings.cs:285) FireFireBall.Update () (at Assets/Scripts/FireBall/FireFireBall.cs:24)

Also, it does not seem to turn off the Colliding as well as being fired forward.

//First we make the Prefab we could also do with the game object public GameObject FireBallPrefab;

     public float Thrust = 15f;
     void Start()
     {
         
     }
 
     // Update is called once per frame
     void Update()
     {   //If I left Click
         if (Input.GetMouseButtonDown(0))
             {
                 GameObject FiredObject; //temp Var that we can assign to what ever
 
                 //Instantiate an Object while also Calling it something so that we can referance it later. In this case. We call it FiredObject
                 FiredObject = Instantiate(FireBallPrefab, gameObject.transform.position, gameObject.transform.rotation) as GameObject;
 
                 // we first get the Component from the Fired Object then we tell unity to get it as well to use for the Physics.IgnoreCollision
                 Physics.IgnoreCollision(FiredObject.GetComponent<Collider>(), GetComponent<Collider>()); 
 
                 FiredObject.GetComponent<Rigidbody>().AddForce(gameObject.transform.forward * Thrust);
 
             }
     }

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carlegos · Aug 30, 2019 at 06:07 PM 0

I replaced the word GameObject with Transform and now it works. But why?

Transform FiredObject; //temp Var that we can assign to what ever

             //Instantiate an Object while also Calling it something so that we can referance it later. In this case. We call it FiredObject
             FiredObject = Instantiate(FireBallPrefab, gameObject.transform.position, gameObject.transform.rotation) as Transform;

             // we first get the Component from the Fired Object then we tell unity to get it as well to use for the Physics.IgnoreCollision
             Physics.IgnoreCollision(FiredObject.GetComponent<Collider>(), GetComponent<Collider>()); 
             
             FiredObject.GetComponent<Rigidbody>().AddForce(gameObject.transform.forward * Thrust);

I_Am_Err00r carlegos · Aug 30, 2019 at 07:18 PM 0

I couldn't tell you why, but I've also never seen this as GameObject or as Transform line you're adding at the end there:

 FiredObject = Instantiate(FireBallPrefab, gameObject.transform.position, gameObject.transform.rotation) as GameObject;

If you take off that at the end, does it let you use the GameObject?

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I keep getting the Error InvalidCastExceptio and I cant seem to fix it!

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