Make enemies spawn again

Hey guys,

I have a script here that is supposed to spawn enemies after a randomly generated amount of seconds, but it only works once. Here is my code:

Code (csharp):

1. #pragma strict
2. var zombiePrefab : GameObject; //Zombie prefab to spawn
3. var spawnController : GameObject; //Main controller to dictate how many to spawn
4. var player : GameObject; //player
5. var zombiesSpawned : int; //keeps track of how many zombies spawned to report back to controller
6. var waitTime : int; //how long to wait until the next zombie is spawned
7. var waitMin : int; // minimum time to wait
8. var waitMax : int; //maximum time to wait
9. var spawn : boolean; // tells to spawn or not
10.  
11. function Start () { //what happens at start
12. waitMin = 3; //
13. waitMax = 10;// ^ Sets initial wait times
14. waitTime = Random.Range(waitMin,waitMax); //Chooses a random number inbetween min and max to set for waittime
15. spawn = true; // Tells spawner to spawn
16. }
17.  
18. function Update () { //constantly happening
19. if(spawn) //if the spawn variable is true
20. {
21.     Spawn(); //call function Spawn
22. }
23. }
24.  
25. function SetSpawn() { // resets the spawn variable after spawning
26.     if(spawn == false) // if spawn variable is false (happens after every spawn)
27.     {
28.         print("SetSpawn");
29.         yield WaitForSeconds(waitTime);
30.         print("Waited");
31.         spawn = true; // makes it spawn again
32.     }
33. }
34.  
35. function NewWaitTime() { //resets the amount of time to wait to a random between min and max
36.     waitTime = Random.Range(waitMin, waitMax); //sets waittime
37. }
38.  
39. function Spawn() { //actually spawns Zombies
40.     if(spawnController.GetComponent(SpawnTimer).roundDone == false)
41.     {
42.     Instantiate(zombiePrefab, transform.position, transform.rotation); //spawns zombie at location of spawner
43.     zombiesSpawned +=1; //adds to spawned count to keep track to send later
44.     NewWaitTime(); // resets wait time
45.     spawn = false; //sets spawn to false (to make you wait until you spawn another zombie)
46.     SetSpawn(); //Runs setspawn to restart the cycle
47.    
48. }  
49. }

What is supposed to happen is it spawns an enemy, then generates a new number and waits for that many seconds, and then spawns another one. I dont understand why its not working, but it spawns one, and then the spawn variable just stays true.

 

Code (csharp):

1.  
2.  
3. function Start() {
4.   Spawn();
5. }
6.  
7.  
8. function Spawn() {
9.    //do the spawn stuff
10.    ;
11.  
12.    //tell spawn to run again after a short wait
13.    Invoke("Spawn", Random.Range(minWait, maxWait);
14. }
15.  
16.  
17.