登録されていないタグはセットできるか?

SetTagTest_01.cs

public class SetTagTest : MonoBehaviour {

	// Rigidbodyがアタッチされたフラグ
	bool isRigidbodyAttached;

	GameObject getByTagObj;
	Rigidbody rb;
	string tagName = "MyNewTag";

	void Start(){
		gameObject.tag = tagName;
		getByTagObj = GameObject.FindGameObjectWithTag(tagName);
		rb = getByTagObj.AddComponent<Rigidbody>();
		isRigidbodyAttached = true;
	}

	void FixedUpdate(){
		if (isRigidbodyAttached){
			rb.AddForce(new Vector3(15f, 15f, 15f));
		}
	}
}