Null reference exception while raycasting.

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I am simply trying to detect when a mouse is hovering over my box with a collider on it. However, it infinitely loops the same bug until the game crashes: NullReferenceException: Object reference not set to instance of object (at line 12). Here is the code:

function Update () {

	var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
	var hit : RaycastHit;

	if (Physics.Raycast (ray, hit, 100)) {
		Debug.DrawLine (ray.origin, hit.point);
		Debug.Log ("Raycast hit : " + hit.collider.gameObject.name);
	}
}

Any help would be appreciated!

That should be at line 3, this is an excerpt of the code.

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I do have a camera, but should the camera be named main? or tagged as main? or in the main layer?

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Got it, the camera needed to have the MainCamera tag. Wow is it laggy though!

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you could try using a corutine to execute the check every 5 or 10 frames, the code in the update all the time could be harsh on the performance.

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1 Answer

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the only issue I can think of on line 3 is that maybe you don’t have a main camera :smiley:

Yeah I got it, my camera wasn't tagged as MainCamera. It seems to run into an infinite loop now anyway, but at least it isn't throwing up errors. Maybe I need to use FixedUpdate.

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