IEnumerator StartWave(float delay)
{
waveStarting = true;
float waveStartTime = Time.time + delay;
while (Time.time < waveStartTime)
{
gui.UpdateTimer(waveStartTime - Time.time);
yield return(null);
}
gui.UpdateTimer(0f);
int waveSize = Mathf.RoundToInt(baseWaveSize + (baseWaveSize * (wave - 1) * waveSizeFactor));
zombieManager.SpawnZombies(waveSize);
waveStarting = false;
}