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AI for enemy characters

recently i purchased few characters for my game imported those characters and added animation files and added AI script to that character every thing works fine but the character is turning around as shown in the video(http://www.youtube.com/watch?v=YLQ-a8h5_iE)

this is the script attached pls help me

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); 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;

}

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asked Oct 22, 2010 at 05:51 AM

reddy gravatar image

reddy
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1 answer: sort voted first

Your character's back is facing +Z. Make the graphics a child of the controlling script and spin them 180* on the Y axis.

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answered Oct 22, 2010 at 06:03 AM

Loius gravatar image

Loius
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asked: Oct 22, 2010 at 05:51 AM

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Last Updated: Oct 22, 2010 at 05:51 AM