null reference woe...

Questions & Answers
1

I understand what a null reference is for the most part, but I have no idea why I am getting one here. I simply instantiate a projectile, and it says:

NullReferenceException: Object reference not set to an instance of an object

Im lost - I thought I was giving it a reference by saying myArrow = Instantiate…

How do I give this object a reference?

	[RPC]
	void SpawnProjectile (Vector3 position, Quaternion rotation, string originatorName, string team)
	{
		
		GameObject myArrow;
		myArrow = Instantiate(arrow, position, rotation) as GameObject;
		//THE BELOW LINE IS APPARENTLY WHAT IS CAUSING THE ERROR ACCORDING TO MONODEVELOP
		myArrow.rigidbody.AddRelativeForce(Vector3.forward * 1000);
		
		//Access the Arrow script on instantiated arrow and supply players name and team.
		
		
		Arrow bScript = myArrow.GetComponent<Arrow>();

		bScript.myOriginator = originatorName;
		bScript.team = team;
							//bScript.arrowPower = power;
	}
}
3

Try this:

    [RPC]
    void SpawnProjectile (Vector3 position, Quaternion rotation, string originatorName, string team)
    {
       GameObject myArrow;
       myArrow = Instantiate(arrow, position, rotation) as GameObject;
       //THE BELOW LINE IS APPARENTLY WHAT IS CAUSING THE ERROR ACCORDING TO MONODEVELOP

       Rigidbody rb = (Rigidbody)myArrow.GetComponent("Rigidbody");
       if( rb == null)
       {
           rb = (Rigidbody)myArrow.AddComponent("Rigidbody");
       }
       rb.AddRelativeForce(Vector3.forward * 1000);

       //Access the Arrow script on instantiated arrow and supply players name and team.


       Arrow bScript = myArrow.GetComponent<Arrow>();

       bScript.myOriginator = originatorName;
       bScript.team = team;
                   //bScript.arrowPower = power;
    }
}
2

GameObjects don’t have rigidbodies by default. You have to explicitly add them.

4

Well at this point I have been able to get rid of the null reference by setting my arrow to instantiate as a transform. IE:

Transform myArrow = Instantiate(arrow, position, rotation) as Transform;

Unfortunately the arrows raycasts are not registering hits on the enemy player - although they are obviously hitting the other player on both player’s screens. Since its a seperate issue though I am going to go ahead and mark this as answered I guess. if anyone has any input on why setting as a transform fixed the null reference I would love to understand more about that. Otherwise I will just assume its because the variable arrow is declared as a transform so that was causing issues maybe.

Thanks again everyone for their help on this.