Make enemies spawn faster with timer? (C#)

Question

I have a timer in my 2D survival game that always counts upwards, now I spawn out a new enemy between 4 and 6 seconds with the help of IEnumerator. But I have a little problem, since I want the game to be harder and harder I want to spawn out more enemies and faster then 4 and 6 seconds the further the timer gets.

So say that the "main timer" is set at a random range between 30, 60 seconds. When this number is set I want to spawn out enemies faster, say between a random range at every 1 and 3 seconds. What is the best way to do this? I tried using an If statment but it doesn't work that well. What do you suggest?

Here's the code for spawning the enemies:

 // Spawn a Bouncing enemy
     IEnumerator SpawnBouncingEnemy() 
     {
         //Wait 3 to 5 seconds when game starts to spawn a ball
         yield return new WaitForSeconds(Random.Range(1, 3));
 
         while(true)
         {
             //Calls the function to set random position
             Vector3 spawnPoint = RandomPointWithinBorders();
             
             // Show spawn location for one second
             Object marker = Instantiate(showEnemySpawn, spawnPoint, Quaternion.identity);
             yield return new WaitForSeconds(1);
             Destroy(marker);
             
             // Spawn enemy
             GameObject newEnemy = (GameObject) Instantiate(EnemyBouncingPrefab, spawnPoint, Quaternion.identity);

                     //Set the enemy to active in the List
             activeEnemies.Add(newEnemy);

                     //Wait for 4, 6 seconds before the enemy spawns again!
             yield return new WaitForSeconds(Random.Range(4, 6f));

                     //What is the best way to do this? TimerScript.timer is the "Main timer" in the game
             if(TimerScript.timer >= Random.Range(30, 60))
             {
                 SpawnBouncingEnemy();
                 yield return new WaitForSeconds(Random.Range(1, 1));
                 countNewBouncingEnemies += 1;
                 print(countNewBouncingEnemies);
             }
 
         }
         
     }

Answer 1

Answer by allenallenallen · May 29, 2016 at 02:58 PM

Why couldn't you use Random.Range(30, 60) earlier in the code?

 // Get random time.
 float randTime = Random.Range(30, 60);
 
 // Wait 3 to 5 seconds when game starts to spawn a ball
 yield return new WaitForSeconds(Random.Range(1, 3));

Later, you can just type this:

 if(TimerScript.timer >= randTime) {
 }

This way, the random time won't keep changing each time you spawn a new enemy.

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Answer 2

Answer by Eudaimonium · May 29, 2016 at 03:01 PM

Your timer mechanics appear to be needlesly complicated...

To start out, replace the timing system with a simple variable in any component's Update loop, for example (pseudocode warning):

 public float InitialTime = 8f;
 public float timer = 8f;
 public float timingModifier = 1.1f;
 
 /// somewhere, in an Update loop in a script far away...
 
 timer -= Time.deltaTime;
 
 if (timer < 0)
 {
     timer = (InitialTime / timingModifier);
     timingModifier += timingModifier;
 }

This will make enemies spawn at first 8 seconds apart, then shorter and shorter additively.

Good mathematical solution beats 19 "if" branches :D

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Make enemies spawn faster with timer? (C#)

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