Creating waves of targets

Now that we have all of the pieces together, let's make it so that we will only spawn a few ducks at a time and have a few of them appear at a time.

  1. Open up the TargetBehaviour script, and in the Start function, remove the following line:
    ShowTarget();

    This will keep the targets in their original position until we are ready for them to be shown.

  2. Next, we will create a new script named GameController by going to the Project tab and then selecting Create | C# Script and once it appears give it a name of GameController. Double-click on the file to open up your IDE of choice and add the following code:
    using UnityEngine;
using System.Collections; 			 // IEnumerator
using System.Collections.Generic; // List

public class GameController : MonoBehaviour
{
    public static GameController _instance;

    [HideInInspector] // Hides var below from inspector
    public List<TargetBehaviour> targets = new List<TargetBehaviour>();

    void Awake()
    {
        _instance = this;
    }

    // Use this for initialization
    void Start ()
    {
        StartCoroutine("SpawnTargets");
    }

    void SpawnTarget()
    {
        // Get a random target
        int index = Random.Range(0, targets.Count);
        TargetBehaviour target = targets[index];

        // Show it
        target.ShowTarget();
    }

    IEnumerator SpawnTargets()
    {
        yield return new WaitForSeconds(1.0f);

        // Continue forever
        while (true)
        {
            int numOfTargets = Random.Range(1, 4);

            for (int i = 0; i < numOfTargets; i++)
            {
                SpawnTarget();
            }

            yield return new WaitForSeconds(Random.Range(0.5f *numOfTargets, 2.5f));
        }
    }
}
  3. Next, we need to fill the values of targets, so to do that, go back into the TargetBehaviour script and add the following function:
        // Called before Start
    void Awake()
    {
        GameController._instance.targets.Add(this);
    }
  4. Then, add an empty game object to the scene (GameObject | Create Empty), center it at 0, 0, 0, and rename it GameController. Afterwards, add a GameController component to it.
  5. Save your project and run the game:
    Creating waves of targets

Now as you can see the ducks appear in waves with a random number of ducks appearing after a period of time. Excellent!

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