Instantiate and Destroy Unity3D

Question

I need to instantiate and destroy a prefab on the run. I tried these:

public Transform prefab;     //I attached a prefab in Unity Editor

Object o = Instantiate(prefab);
//using this I cannot get the transform component (I don't know why) so useless

Transform o=(Transform)Instantiate(prefab);
//gives transform and transform component cannot be destroyed

GameObject o=(GameObject)Instantiate(prefab);
//invalid cast

So how to do that?

You need to study some OO concept. It's all about variable TYPE. — Chchwy, Aug 13 '13 at 09:47

score 3 · Answer 1 · answered Aug 11 '13 at 23:02

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gives transform and transform component cannot be destroyed

Destroy the GameObject to which the Transform component is attached to:

GameObject.Destroy(o.gameObject);

Instantiate method returns the same type of the object passed as parameter. Since it's a Transform you can't cast it to GameObject. Try this:

GameObject o=((Transform)Instantiate(prefab)).gameObject;

answered Aug 11 '13 at 23:02

Heisenbug

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it says cannot cast from source to destination – Temp Id Aug 12 '13 at 13:43
Which part? Both of Heisenbug's snippets work just fine, copied verbatim. – Jerdak Aug 12 '13 at 17:26

score 3 · Accepted Answer · edited Apr 07 '18 at 20:15

3

You don't have to declare your Instance as Object, if you do you get the ancestor object which it has not the transform component.

public GameObject prefab;
GameObject obj = Instantiate(prefab);

If you want get transform component just type obj.transform.
If you want destroy the object type Destroy(obj);.

edited Apr 07 '18 at 20:15

K.Dᴀᴠɪs

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answered Aug 12 '13 at 01:15

BilalDja

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cannot convert implicitly...so I added (GameObject) there and it ran successfully but I need to check a few more things to verify and then implement it – Temp Id Aug 12 '13 at 13:45

score 1 · Answer 3 · answered Aug 12 '13 at 04:13

1

Your codes does not make sense..

public Transform prefab;
Object o = Instantiate(prefab);

You are instantiating a Transform? Why dont you try attaching the prefab instead?

You should try:

public GameObject prefab; // attach the prefab in Unity Editor
GameObject obj = Instantiate(prefab);
GameObject.Destroy(obj);

answered Aug 12 '13 at 04:13

xuanweng

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His code makes perfect sense. The [official documents](http://docs.unity3d.com/Documentation/ScriptReference/Object.Instantiate.html) even use the same `public Transform Prefab` notation. – Jerdak Aug 12 '13 at 12:35
`public Transform prefab;` is ok, you could declare the variable type as Transform or GameObject, depend on your demand. – Chchwy Aug 13 '13 at 09:47
This has bothered me for years, it seems it finally makes sense. "The Parent object will be copied" if a component. Basically if you want to only focus on the transform, copy it. Finally makes sense. I recommend looking up assigning game objects to scripts, unity answers has a nice explanation there on that. – Stephen J Feb 17 '14 at 03:19

score 1 · Answer 4 · 2013-11-26T15:17:30.050

I noticed the accepted answer is actually wrong.

When using the Instantiate function of the MonoBehaviour class we must specify the type of what we are instantiating. I highly recommend reading Instantiate API reference.

To instantiate a prefab as a GameObject

GameObject g = Instantiate(prefab) as GameObject;

To instantiate a prefab as a Transform and provide a position in 3D space.

Transform t = Instantiate(prefab, new Vector3(1,10,11), new Quaternion(1,10,11,100));

To Destroy a component, which means you can destroy scripts attached to gameObjects as well as rigibodies and other components.

Destroy(g);

or

Destroy(t.gameObject)

Instantiate and Destroy Unity3D

4 Answers4