LaunchProjectile.js

#pragma strict

var projectilePrefab : Rigidbody;
var launchInterval : float = 10.0;
var randomTrajectory : boolean = false;
private var isLaunched : boolean = false;

private var audioSource: AudioSource;

// Starting in 2 seconds.
// a projectile will be launched every 5 seconds

// You can control whether projectile collides with world objects
// via Unity's physics collision matrix (put projectile on its own layer).

//function OnBecameVisible () {
// only launch invokeRepeating once
//	if (isLaunched == false) {
//		isLaunched = true;
//		InvokeRepeating("LaunchProjectile", 0, launchInterval);
//	}
//}

function Start () {
	audioSource = GetComponent.<AudioSource>();
}

function OnTriggerEnter (other : Collider) {
  if (other.gameObject.CompareTag ("Player")){
		if (isLaunched == false) {
			isLaunched = true;
			InvokeRepeating("LaunchProjectile", 0, launchInterval);
		}	
	}
}

function OnTriggerExit (other : Collider) {
  if (other.gameObject.CompareTag ("Player")){
		if (isLaunched == true) {
			CancelInvoke("LaunchProjectile");
			isLaunched = false;
		}	
	}
}


function LaunchProjectile () {
    var instance : Rigidbody = Instantiate(projectilePrefab, transform.position, transform.rotation);
	if (randomTrajectory == true) {instance.velocity = Random.onUnitSphere * 5;}
	if (audioSource) {audioSource.Play();}	
}