CODEWITHSUNDEEP
unity-game-engineinstantiationunityscript
Jordi
Jordi

Reputation: 166

ArgumentException: The prefab you want to instantiate is null

I'm getting an error and I don't know why. From the error I can see that there is something wrong with line 12, I think.

The script is larger but is not needed to solve the problem. But if you really need it, you can ask for it.

Here is the code:

if(RandomInt==2) {
    var randomNumberB = Random.Range(3,5);
    for(var b = 0; b < randomNumberB; b++) {
        var xCoB = childVector3.x + Random.Range(0,10);
        var zCoB = childVector3.z + Random.Range(0,10);
        var randomRotationB = Quaternion.Euler(0,Random.Range(0,360),0);
        var chancheB = Random.Range(0,2);
        if(chancheB == 0) {
            var bushC = Instantiate(bushes[Random.Range(0,bushes.length)], Vector3(xCoB, childVector3.y, zCoB), randomRotationB);
            bushC.transform.name = "bush";
        } else {
            Instantiate(cactus, Vector3(xCoB, childVector3.y, zCoB), randomRotationB).transform.name = "cactus";
        }
    }
}

Upvotes: 3

Views: 5827

Answers (2)

thomsky
thomsky

Reputation: 81

it is easy if you have prefabs sitting in the root Resources folder. It is different if you want them to be in a subfolder of Resources. You will need to create a "Prefabs" folder within.

Since you are using Javascript

  1. Given a prefab named "Your Prefab.prefab" within Assets/Resources:

    var NewGameObject : GameObject = Resources.Load("Your Prefab"),Vector3.zero,Quaternion.identity);

    This will allow you to have a reference to that prefab, loaded into memory.

  2. If you wish to contain a prefab or more within a folder in Assets/Resources you must do the following:

    2a. Create a folder named "Prefabs" within Assets/Resources.

    2b. Create your folder there (e.g. "Resources/Prefabs/Your Prefab Folder");

    2c. Given a prefab named "Your Prefab.prefab":

    var NewGameObject : GameObject = Resources.Load("Prefabs/Your SubFolder/Your Prefab"),Vector3.zero,Quaternion.identity);

Notes:

Don't forget to remove the ".prefab" extension.

The Unity manual states that you can load assets from Resources without supplying a path with folder names. Certainly in regards to prefabs (and javascript?) that does not seem to be true (Unity 4.6).

Upvotes: 1

axwcode
axwcode

Reputation: 7824

Make cactus a prefab.

Then make a public variable:

 public GameObject cactus;

Then drag and drop the prefab into the script variable via de Editor. Then you can instantiate.

 if(cactus != null)
 {
    GameObject g = Instantiate(cactus, new Vector3(xCoB, childVector3.y, zCoB), randomRotation) as GameObject;

    g.name = "cactus";
 }

Upvotes: 4

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