Zombie AI not working?!

Unity Engine
1

My zombie isn’t working and not quite sure what the problem is. I got this script off of a website and it was working before but now it isn’t. I know this should be posted on unity answers instead, but it was rejected twice so I’m looking for here.

Here is the error: NullReferenceException: Object reference not set to an instance of an object Zombie.FixedUpdate () (at Assets/scripts/Scene5 (level 1)/Zombie.js:18)

Here is the script:

    #pragma strict
    varVisionDistance:float=200;
    varMovementSpeed:float=2;
    varHealth:int=3;
    functionFixedUpdate(){
    // Get the Player object
    var player :GameObject=GameObject.Find("Player");
    var characterController :CharacterController=GetComponent(CharacterController);
    // Get the position of the Zombie's eyes
    var eyePosition :Vector3= transform.position;
    eyePosition.y += characterController.height;
    // Get the difference between the player and the Zombie positions
    // This creates a direction vector pointing in the direction of the Player.
    var lookDirection = player.transform.position - eyePosition;
    lookDirection = lookDirection.normalized;
    // Only look for the player or objects that are part of the scenery (terrain, buildings, etc.)
    var layerMask :int=1<<LayerMask.NameToLayer("Player")|1<<LayerMask.NameToLayer("Default");
    // The direction the Zombie will move, defaults to standing still
    var movementDirection :Vector3=Vector3.zero;
    // hitInfo will contain information about what the Zombie can see.
    var hitInfo :RaycastHit;
    if(Physics.Raycast(eyePosition, lookDirection, hitInfo,VisionDistance, layerMask)){
    // If the Zombie can see the Player move toward them.
    if(hitInfo.collider.gameObject == player){
    movementDirection = lookDirection;
    movementDirection.y =0;
    movementDirection = movementDirection.normalized;
    }
    }
    // Face and move in the chosen direction
    if(movementDirection !=Vector3.zero){
    transform.rotation =Quaternion.LookRotation(movementDirection,Vector3.up);
    }
    characterController.SimpleMove(movementDirection *MovementSpeed);
    }

Any help is appreciated.

2

First of all use code tags. Code isn’t readable without them.

As for your error, it’s saying there is a null reference. So in your script you’re trying to get access to something that doesn’t exist

3

Thanks for the help but I still can’t find the problem. :frowning:

If it helps, this is the line of the error (line 14):
var lookDirection = player.transform.position - eyePosition;

4

use code tags, we can’t read your code… Using code tags properly - Unity Engine - Unity Discussions

5

Thanks for the help with code tags. :slight_smile: