Need Scripting Help.

Unity Engine
1

I need help with my EnemyAI.

I made the whole script, but have the error, that the mob dosen’t want to go to the player :frowning:

The script is:

	var target : Transform;
	var moveSpeed : int;
	var rotationSpeed : int;
	var maxDistance : int;
	
	var myTransform : Transform;
	
function Awake () {
	myTransform = transform;
}
	
function Start () {
	var go : GameObject = GameObject.FindGameObjectWithTag("Player");
	
	target = go.transform;
	
	maxDistance = 2;
	
}

function Update () {
	Debug.DrawLine(target.position, myTransform.position, Color.Yellow);
	
	//Look at target
	myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed * Time.deltaTime);
	
	if(Vector3.Distance(target.position, myTransform.position) > maxDistance) {
		//move towards target
		myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
	}
}
2

Can you edit your post and drop the code between some tags so it's easier to read it.

3

OK, you set your rotation thorugh a slerp of a lookrotation at a speed. Then you check to see if the distance is greater than a “max” distance and move it forward at speed.

Though confusing, the premise works. It needs to be cleaned up.

So I tinkered with it some and came up with a working solution. I added a bit to the solution as well.

Changes:

I added a ground checker. This will allow the unit to move up and down inclines and such. I added in gravity, so that he can fall. Physics check omit the current object. This may have to be redone to specify a ground or floor if multiple mobs interfere with each other.

I added a Dot check to see if the target was in front of or behind the unit. I also added in a 0.4 rotational amount so that the unit has to be in the front 60% of the view before the unit moves.

I changed “Max” distance to “Min” distance and added in the corrected “Max” distance to handle if things are too far away. I also added in the code that makes him not move if these events happen.

I changed the way the Slerp and look at rotations are done to make more sense.

I set the rotation of the euler.x to zero so that the unit does not face up or down, always level.

I changed the position reorientation to Translate. (easier to develop and understand)

I tested it, to verify that the gravity and movement features work. In testing I increased and decreased the rotation speed to see if I could always stay behind the target.

var target : Transform;
var moveSpeed : float = 5.0;
var rotationSpeed : float = 2.0;
var minDistance : float = 2.0;
var maxDistance : float = 30.0;

function Start () {
	var go : GameObject = GameObject.FindGameObjectWithTag("Player");
	target = go.transform;
	minDistance = 2;
}

function Update () {
	CheckGround();
	// check to see if we are out of bounds to move
	if((target.position - transform.position).magnitude < minDistance) return;
	if((target.position - transform.position).magnitude > maxDistance) return;
	
	// hold current rotation
	var rotation = transform.rotation;
	// set the look rotation
	transform.LookAt(target);
	// make sure that the X value in the euler is set to zero.
	transform.localEulerAngles.x = 0; // so we dont end up looking up or down
	// Slerp from the old rotation to the new rotation
	transform.rotation = Quaternion.Slerp(rotation, transform.rotation, rotationSpeed * Time.deltaTime);
	
	// get the direction to target
	var direction = target.position - transform.position;
	// check the direction to see if it is forward of the ai
	var checkForward = Vector3.Dot(transform.forward, direction.normalized);
	
	// if we are close to facing in the right direction move forward
	if(checkForward > 0.4) transform.Translate(Vector3.forward * moveSpeed * Time.deltaTime);
}

function CheckGround(){
	//check our grounding
	var ray = new Ray(transform.position + Vector3.up * 2.0, -Vector3.up);
	var hits : RaycastHit[];
	hits = Physics.RaycastAll(ray, 2.1);
	var didHit = false;
	for(var hit : RaycastHit in hits){
		if(hit.transform.root != transform.root){
			didHit = true;
			transform.position = hit.point;
		}
	}
	
	// if we did not hit, we need to fall
	if(! didHit){
		transform.position += Physics.gravity * Time.deltaTime;
	}
}

Hope it helps u out.

4

Thanks, Now i want to change it to move to a point, then move on to the next?? Or should i make a new script??(L)

Thanks :slight_smile:
Jonas