How to do it...

To find the nearest spawn point, follow these steps:

1. Add the following method to the C# script class called SpawnPointManager:

    public GameObject GetNearestSpawnpoint (Vector3 source){
       GameObject nearestSpawnPoint = spawnPoints[0];
       Vector3 spawnPointPos = spawnPoints[0].transform.position;
       float shortestDistance = Vector3.Distance(source, spawnPointPos);

       for (int i = 1; i < spawnPoints.Length; i++){
         spawnPointPos = spawnPoints[i].transform.position;
         float newDist = Vector3.Distance(source, spawnPointPos);
         if (newDist < shortestDistance){
           shortestDistance = newDist;
           nearestSpawnPoint = spawnPoints[i];
         }
       }

       return nearestSpawnPoint;
     } 

2. We now need to change the first line in the C# SpawnBall class so that the spawnPoint variable is set by a call to our new method; that is, NearestSpawnpoint(...):

    private void CreateSphere(){
       GameObject spawnPoint...