Side scroller spawns at different Y

Questions & Answers
1

I am making a space shooter, I have waves of enemies coming in from the right but I don’t want them spawning close on the Y axis one after another. I have tried comparing the new vector with the previous vector to see if it’s less or more by 2 but it doesn’t seem to be working. I’m new to unity and C# so if anyone could help that would be great!

void getSpawn()
	{
		counter = 0;

		if (firstSpawn == true) { // First spawn has no previous
			spawnPosition = new Vector3 (5, Random.Range (-spawnValues.y, spawnValues.y), spawnValues.z);
			firstSpawn = false;
		} else {
			
			previousPosition = spawnPosition;// set previous
			spawnPosition = new Vector3 (5, Random.Range (-spawnValues.y, spawnValues.y), spawnValues.z);

			Debug.Log(spawnPosition.y);
			Debug.Log(previousPosition.y);

			while (previousPosition.y < spawnPosition.y -2 || previousPosition.y > spawnPosition.y +2)  {
				spawnPosition = new Vector3 (5, Random.Range (-spawnValues.y, spawnValues.y), spawnValues.z);
				previousPosition = spawnPosition;
				counter++;
				Debug.Log ("hit while");
				if (counter == 20){ //stops game from freezing whilst testing.
					break;}
		
		}

Thanks Calum

2

I would make a List and fill it on start() with like 20 different y positions within a given range:

List<float> possibleSpawns = new List<float>();
float distanceBetweenSpawnPoints
int previousRand = 0;
int rand = 0;
void Start(){
for (int i = 0; i < 20; i++){
possibleSpawns.Add(distanceBetweenSpawnPoints*i);
//Fills the list with some spawnPoints
}
}

void Update(){

while (rand == previousRand){
rand = Random.Range(0, possibleSpawns.Count); //Roll a random within the list
}
previousRand = rand;

spawnPosition = (xValue, possibleSpawns[rand], zValue);
}