Enemy Runs In Place

Scripting
1

I have an enemy that when going through the waypoints it runs fine, but as soon as it sees me it slows down but continues to run.

AI SCRIPT

var speed = 3.0;
var rotationSpeed = 5.0;
var shootRange = 15.0;
var attackRange = 30.0;
var shootAngle = 4.0;
var dontComeCloserRange = 5.0;
var delayShootTime = 0.35;
var pickNextWaypointDistance = 2.0;
var target : Transform;

private var lastShot = -10.0;

// Make sure there is always a character controller
@script RequireComponent (CharacterController)

function Start () {
	// Auto setup player as target through tags
	if (target == null  GameObject.FindWithTag("Player"))
		target = GameObject.FindWithTag("Player").transform;

	Patrol();
}

function Patrol () {
	var curWayPoint = AutoWayPoint.FindClosest(transform.position);
	while (true) {
		var waypointPosition = curWayPoint.transform.position;
		// Are we close to a waypoint? -> pick the next one!
		if (Vector3.Distance(waypointPosition, transform.position) < pickNextWaypointDistance)
			curWayPoint = PickNextWaypoint (curWayPoint);

		// Attack the player and wait until
		// - player is killed
		// - player is out of sight		
		if (CanSeeTarget ())
			yield StartCoroutine("AttackPlayer");
		
		// Move towards our target
		MoveTowards(waypointPosition);
		
		yield;
	}
}


function CanSeeTarget () : boolean {
	if (Vector3.Distance(transform.position, target.position) > attackRange)
		return false;
		
	var hit : RaycastHit;
	if (Physics.Linecast (transform.position, target.position, hit))
		return hit.transform == target;

	return false;
}

function Shoot () {
	// Start shoot animation
//	animation.CrossFade("shoot", 0.3);

	// Wait until half the animation has played
	yield WaitForSeconds(delayShootTime);
	
	// Fire gun
//	BroadcastMessage("Fire");
	
	// Wait for the rest of the animation to finish
//	yield WaitForSeconds(animation["shoot"].length - delayShootTime);
}

function AttackPlayer () {
	var lastVisiblePlayerPosition = target.position;
	while (true) {
		if (CanSeeTarget ()) {
			// Target is dead - stop hunting
			if (target == null)
				return;

			// Target is too far away - give up	
			var distance = Vector3.Distance(transform.position, target.position);
			if (distance > shootRange * 3)
				return;
			
			lastVisiblePlayerPosition = target.position;
			if (distance > dontComeCloserRange)
				MoveTowards (lastVisiblePlayerPosition);
			else
				RotateTowards(lastVisiblePlayerPosition);

			var forward = transform.TransformDirection(Vector3.forward);
			var targetDirection = lastVisiblePlayerPosition - transform.position;
			targetDirection.y = 0;

			var angle = Vector3.Angle(targetDirection, forward);

			// Start shooting if close and play is in sight
			if (distance < shootRange  angle < shootAngle)
				yield StartCoroutine("Shoot");
		} else {
			yield StartCoroutine("SearchPlayer", lastVisiblePlayerPosition);
			// Player not visible anymore - stop attacking
			if (!CanSeeTarget ())
				return;
		}

		yield;
	}
}

function SearchPlayer (position : Vector3) {
	// Run towards the player but after 3 seconds timeout and go back to Patroling
	var timeout = 3.0;
	while (timeout > 0.0) {
		MoveTowards(position);

		// We found the player
		if (CanSeeTarget ())
			return;

		timeout -= Time.deltaTime;
		yield;
	}
}

function RotateTowards (position : Vector3) {
	SendMessage("SetSpeed", 0.0);
	
	var direction = position - transform.position;
	direction.y = 0;
	if (direction.magnitude < 0.1)
		return;
	
	// Rotate towards the target
	transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
	transform.eulerAngles = Vector3(0, transform.eulerAngles.y, 0);
}

function MoveTowards (position : Vector3) {
	var direction = position - transform.position;
	direction.y = 0;
	if (direction.magnitude < 0.5) {
		SendMessage("SetSpeed", 0.0, SendMessageOptions.DontRequireReceiver);
		return;
	}
	
	// Rotate towards the target
	transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
	transform.eulerAngles = Vector3(0, transform.eulerAngles.y, 0);

	// Modify speed so we slow down when we are not facing the target
	var forward = transform.TransformDirection(Vector3.forward);
	var speedModifier = Vector3.Dot(forward, direction.normalized);
	speedModifier = Mathf.Clamp01(speedModifier);

	// Move the character
	direction = forward * speed * speedModifier;
	GetComponent (CharacterController).SimpleMove(direction);
	
	SendMessage("SetSpeed", speed * speedModifier, SendMessageOptions.DontRequireReceiver);
}

function PickNextWaypoint (currentWaypoint : AutoWayPoint) {
	// We want to find the waypoint where the character has to turn the least

	// The direction in which we are walking
	var forward = transform.TransformDirection(Vector3.forward);

	// The closer two vectors, the larger the dot product will be.
	var best = currentWaypoint;
	var bestDot = -10.0;
	for (var cur : AutoWayPoint in currentWaypoint.connected) {
		var direction = Vector3.Normalize(cur.transform.position - transform.position);
		var dot = Vector3.Dot(direction, forward);
		if (dot > bestDot  cur != currentWaypoint) {
			bestDot = dot;
			best = cur;
		}
	}
	
	return best;
}
2

AIAnimation Script

var minimumRunSpeed = 1.0;

function Start () {
	// Set all animations to loop
	animation.wrapMode = WrapMode.Loop;

	// Except our action animations, Dont loop those
//	animation["shoot"].wrapMode = WrapMode.Once;
	
	// Put idle and run in a lower layer. They will only animate if our action animations are not playing
	animation["idle"].layer = -1;
	animation["walk"].layer = -1;
	animation["run"].layer = -1;
	
	animation.Stop();
}

function SetSpeed (speed : float) {
	if (speed > minimumRunSpeed)
		animation.CrossFade("run");
	else
		animation.CrossFade("idle");
}
3

I know it has been awhile, but I am still having this problem. Can anyone help?

4

In the voice of Ben Stein

Anybody, Anybody

5

In your code… and I think you are giving way too much code here… you have this:

function MoveTowards (position : Vector3) {
	var direction = position - transform.position;
	direction.y = 0;
	if (direction.magnitude < 0.5) {
		SendMessage("SetSpeed", 0.0, SendMessageOptions.DontRequireReceiver);
		return;
	}
	
	// Rotate towards the target
	transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
	transform.eulerAngles = Vector3(0, transform.eulerAngles.y, 0);

	// Modify speed so we slow down when we are not facing the target
	var forward = transform.TransformDirection(Vector3.forward);
	var speedModifier = Vector3.Dot(forward, direction.normalized);
	speedModifier = Mathf.Clamp01(speedModifier);

	// Move the character
	direction = forward * speed * speedModifier;
	GetComponent (CharacterController).SimpleMove(direction);
	
	SendMessage("SetSpeed", speed * speedModifier, SendMessageOptions.DontRequireReceiver);
}

I can only assume that you have another script that manages the SetSpeed function. I don’t see this function here, but givin what you have I would add print(speed * speedModifier); in the end of that function. This will help you get started to understand what the speed values are becoming. If your speed looks constant then it may be on the other side.

6

It is from the old fps tutorial, so I will sort through and see what is going on. Thank you