Does anyone know how to make an AI that dodges obstacles when chasing the player?

Questions & Answers
1

Here's what i've got so far, as it says in the title; I want my AI to move around obstacles when he is chasing the player, if anyone would be kind enough to give me some tips it would be much appreciated.

so far, the enemy chases the player when they get into range and if the enemy loses sight of the player, it will go back the other way and patrol using raycast...

var speed : float = 9;
var rotateSpeed : float = 1;
private var direction : float;
var forwardRay : float = 2;
var leftRay : float = 5;
var rightRay : float = 5;
var player : Transform;
var MaxDistance : int = 30;
var MinDistance : int = 5;

function Update () {

var distance : Vector3 = player.position - transform.position;
    //if player is in range, enemy will follow
    if(distance.magnitude < MaxDistance){
        if(distance.magnitude > MinDistance){
            Debug.DrawLine(transform.position, player.position);
            if(!Physics.Linecast(transform.position, player.position)){
                Pursue();
            }else if(Physics.Linecast(transform.position, player.position)){
                Patrol();
            }
        }
    }else{
        Patrol();
    }
}

function Patrol(){
    //if there is nothing within range, then move forward
    if(!Physics.Raycast(transform.position, transform.forward, forwardRay)){
        transform.Translate(Vector3.forward * speed * Time.smoothDeltaTime);
    }else{
        //if there is something to the left, then direction = 1
        if(Physics.Raycast(transform.position, -transform.right, leftRay)){
            direction = 1;
        //if there is something to the right, the direction = -1
        }else if(Physics.Raycast(transform.position, transform.right, rightRay)){
            direction = -1;
        //if there is nothing to the left or right, then direction = 1
        }else{
            var RandomDirection = Random.value;
            if(RandomDirection > 0.5){
                direction = 1;
            }else{
                direction = -1;
            }
        }
        //rotate 90 degrees in the direction (1 = right, -1 = left)
        transform.Rotate(Vector3.up, 90 * rotateSpeed * direction);
    }
}

function Pursue(){
        var distance : Vector3 = player.position - transform.position;

        //move towards player
        velocity = distance.normalized * speed;
        rigidbody.velocity = velocity;
}
2

Depending on the nature of the obstacles, steering behaviors might be appropriate (this approach allows you to easily combine and prioritize different behaviors, such as chasing a target and avoiding obstacles).

Although I've never looked at it myself, I believe there's a 'steering behaviors' library available that can be used with Unity.

3

Aron Granberg have made an impressive A* path-finding system. Maybe you can use it to give your AI a boost?