NullRefException in RaycastAll

Questions & Answers
1

Ok, so I’m chugging through Eteeski’s AI Pathfinding tutorials, trying to make the enemy’s body stay on the ground, but I’m hitting an error that only appears when I run it in play mode:

NullReferenceException: Object reference not set to an instance of an object
Boo.Lang.Runtime.RuntimeServices.InvokeBinaryOperator (System.String operatorName, System.Object lhs, System.Object rhs)
GenericEnemyBody.Update () (at Assets/Scripts/GenericEnemyBody.js:21)

And here is my code:

var moveDamp : float = .1;
var turnSpeed : float = 10;
var parentToFollow : Transform;

var velocityX : float;
var velocityZ : float;

function Awake () 
{
	parentToFollow = transform.parent;
	transform.parent = null;
}

function Update () 
{
	transform.position.x = Mathf.SmoothDamp(transform.position.x, parentToFollow.position.x, velocityX, moveDamp);
	transform.position.z = Mathf.SmoothDamp(transform.position.x, parentToFollow.position.z, velocityZ, moveDamp);
	transform.rotation = Quaternion.Lerp(transform.rotation, parentToFollow.rotation, turnSpeed * Time.deltaTime);
	
	var hits : RaycastHit[];
	hits = Physics.RaycastAll(Ray(transform.positon + Vector3(0, 100, 0), (Vector3.up * -1)));

	for(var i : int = 0; i < hits.length; i++)
	{
		var hit : RaycastHit = hits*;*

  •  if(hit.transform.gameObject == parentToFollow.gameObject.GetComponent(GenericEnemyBehavior).currentCell)*

  •  {*

  •  	transform.position.y = hit.point.y;*

  •  }*
  • }*

}
Thanks for the help!!!

2

Can you please try to call this overload instead of the one you used. You can pass float.MaxValue to distance parameter. I remember I had some issues with raycast before and I suspected that it was Unity’s internal bug. Please try this and let me know if it help.

RaycastAll(ray: Ray, distance: float)

3

without knowing which line these errors occur on here is my stab in the dark:

  • does this object even have a parent to begin with (why is this component that is being gotten n=inf times an Update() not being cached if the object is just a parent)
  • does the list have anything in it? is the list null?
  • does the parent have this component you are trying to get n=inf times