Example AstarAI.cs

Full source for the simple AI written in the get started guide .It should be attached to a GameObject with a Seeker and a CharacterController also attached.

using UnityEngine;
// Note this line, if it is left out, the script won't know that the class 'Path' exists and it will throw compiler errors
// This line should always be present at the top of scripts which use pathfinding
using Pathfinding;

public class AstarAI : MonoBehaviour {
public Transform targetPosition;

private Seeker seeker;
private CharacterController controller;

public Path path;

public float speed = 2;

public float nextWaypointDistance = 3;

private int currentWaypoint = 0;

public float repathRate = 0.5f;
private float lastRepath = float.NegativeInfinity;

public void Start () {
seeker = GetComponent<Seeker>();
controller = GetComponent<CharacterController>();

public void OnPathComplete (Path p) {
Debug.Log("A path was calculated. Did it fail with an error? " + p.error);

// Path pooling. To avoid unnecessary allocations paths are reference counted.
// Calling Claim will increase the reference count by 1 and Release will reduce
// it by one, when it reaches zero the path will be pooled and then it may be used
// by other scripts. The ABPath.Construct and Seeker.StartPath methods will
// take a path from the pool if possible. See also the documentation page about path pooling.
if (!p.error) {
if (path != null) path.Release(this);
path = p;
// Reset the waypoint counter so that we start to move towards the first point in the path
currentWaypoint = 0;
} else {

public void Update () {
if (Time.time > lastRepath + repathRate && seeker.IsDone()) {
lastRepath = Time.time;

// Start a new path to the targetPosition, call the the OnPathComplete function
// when the path has been calculated (which may take a few frames depending on the complexity)
seeker.StartPath(transform.position, targetPosition.position, OnPathComplete);

if (path == null) {
// We have no path to follow yet, so don't do anything

if (currentWaypoint > path.vectorPath.Count) return;
if (currentWaypoint == path.vectorPath.Count) {
Debug.Log("End Of Path Reached");

// Direction to the next waypoint
// Normalize it so that it has a length of 1 world unit
Vector3 dir = (path.vectorPath[currentWaypoint] - transform.position).normalized;
// Multiply the direction by our desired speed to get a velocity
Vector3 velocity = dir * speed;
// Note that SimpleMove takes a velocity in meters/second, so we should not multiply by Time.deltaTime

// The commented line is equivalent to the one below, but the one that is used
// is slightly faster since it does not have to calculate a square root
//if (Vector3.Distance (transform.position,path.vectorPath[currentWaypoint]) < nextWaypointDistance) {
if ((transform.position-path.vectorPath[currentWaypoint]).sqrMagnitude < nextWaypointDistance*nextWaypointDistance) {