Instantiating rigidbody, wont let me alter the velocity

[cosmo22Participant]

hey i have a enemy with ai and im trying to get it to fire fireballs at the player, i have a script that handles the trajectory but when i instantiate my ai through rain it wont let me change the velocity, it just gives me a null reference exception, i dont think it is the trajecory code as i have tried to change its velocity with just a vector3.up * 5 but it still gives me the null referenece exception, here is the code for instantiating the fireballs:

public override void Start(AI ai)
{
fireBallAttack = GameObject.FindObjectOfType<FireBallAttack> ();
spawnPoint = ai.WorkingMemory.GetItem<GameObject> (“spawnPoint”).transform;
bullet = ai.WorkingMemory.GetItem<GameObject> (“bullet”);
target = GameObject.FindGameObjectWithTag (“Player”).transform;
base.Start(ai);
}

public override ActionResult Execute(AI ai)
{

Rigidbody instantiatedBullet = AIRig.Instantiate(bullet, spawnPoint.transform.position, Quaternion.identity) as Rigidbody;
instantiatedBullet.rigidbody.velocity = fireBallAttack.MoveTowards(ai.Body.transform.position, target.position,10); <—- this is the like it gives me the null reference exception on

Physics.IgnoreCollision(instantiatedBullet.collider, ai.Body.collider);
Debug.Log(instantiatedBullet.velocity);

return ActionResult.SUCCESS;

}
THE ERROR:
NullReferenceException: Object reference not set to an instance of an object
FireBall.Execute (RAIN.Core.AI ai) (at Assets/AI/Actions/FireBall.cs:33)

• This topic was modified 2 years, 5 months ago by  cosmo22.

[primeKeymaster]

I’m sure instantiatedBullet is null. Shouldn’t that be

GameObject instantiatedBullet = GameObject.Instantiate(bullet, spawnPoint.transform.position, Quaternion.identity) as GameObject;

[cosmo22Participant]

nah it wasnt null, it was instantiating the bullet, but i fixed it by doing the same as you did there and doing instantiatedBullet.velocity….. thanks for the help

[primeKeymaster]

Interesting. Maybe this is a Unity trick I’m unaware of. In Start you are retrieving bullet as a GameObject. When you are instantiating you are casting to RigidBody. Does Unity override that operator to give you an attached component (a RigidBody in this case)?

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