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Question by Cl0ud · Nov 03, 2013 at 09:23 PM · gameobjectphysicsinstantiateraycastprefab

Instantiate a prefab and parenting it?

Hello there, I'm having trouble with instantiating a prefab and making it a child of the object that it hits. This is the error that Unity gives to me :

"Setting the parent of a transform which resides in a prefab is disabled to prevent data corruption. UnityEngine.Transform:set_parent(Transform) Bullet:Update() (at Assets/Script/Bullet.js:39)"

and this is part of the script "interested" :

 var HitHole : GameObject;
 var power : int;
 var HitParticleSpacing : float = 0.01;
 
 function Update () 
 {
 
 var fwd = transform.TransformDirection(Vector3.forward);
 var Hit : RaycastHit;
        if (HitHole)
        
           {
           Instantiate(HitHole, Hit.point + (Hit.normal * HitParticleSpacing), Quaternion.LookRotation(Hit.normal));
           
           HitHole.transform.parent = transform;
           
        if (Hit.rigidbody !=null)
      
                Hit.rigidbody.AddForceAtPosition(fwd * power, Hit.point);
         
           }
 }

I've someone can help me , I just don't know what's my error!

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avatar image Fornoreason1000 · Nov 03, 2013 at 09:26 PM 0
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HitHole.transform.parent = transform; is the error, you don't need to parent bullets to the gameObject

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Answer by aldonaletto · Nov 03, 2013 at 09:30 PM

You're trying to modify the prefab HitHole! Assign the result of Instantiate to a temporary variable and use it to modify the instance created, not the prefab:

    ...
    if (HitHole){
        // get a reference to the newly created object:
        var hole = Instantiate(HitHole, Hit.point + (Hit.normal * HitParticleSpacing), Quaternion.LookRotation(Hit.normal));
        // "glue" hole to the object hit:
        hole.transform.parent = Hit.transform;
        if (Hit.rigidbody !=null)
            Hit.rigidbody.AddForceAtPosition(fwd * power, Hit.point);
        }
    }
    ...
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avatar image Cl0ud · Nov 04, 2013 at 05:41 PM 0
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If I do like that , for some strange reason, the prefab isn't instantiated at all! Any idea? :/

avatar image aldonaletto · Nov 04, 2013 at 07:39 PM 0
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There was an error in your original code: the hole must be childed to the object hit in order to "glue" it to the target (line 6 in my answer). I have not noticed that at first, but now my answer is fixed.

avatar image Cl0ud · Nov 04, 2013 at 08:45 PM 0
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Thank you man , it works now! You're the best! :D

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