perfect synch with music

Questions & Answers
1

Hi guys, I need a little help here.
I want to create a rhythm game for android and I need enemy to appear on screen on a specific time matching with the music.
I’ve wrote this piece of script that makes me go out of sync:

for(var k = 1; k < time_s.Length; k++){
	if(gameover)
		return;
	var lack : double = Time.time;
	print(Time.time);
	Instantiate(enemy_s[k-1],myTransform.position,myTransform.rotation);
	lack-=Time.time;
	print(Time.time);
	yield new WaitForSeconds(wait[k] -lack);
}

Problem is that Instantiate does take it’s time and it’s added to the instantiation of the enemy, making the game out of sync after 20-30 enemys.
I’ve tried to evade this problem by using the lack variable that should store the instantiation time and subtract to the wait, but Time.time only have 4-5 decimal and lack is always 0.
Does exist a Time.time more precise or can you guys help me finding another way to do it?

2

You can sync to audio.timeSamples instead of Time.time - this property shows the current sample number being played, thus it’s in perfect sync with the music. In order to use your present array time_s, you can convert the time to the timeSamples equivalent (multiply by audio.clip.frequency):

for (var k = 1; k < time_s.Length; k++){
    if (gameover)
       return;
    // find the sample number equivalent to time_s[k]:
    var nSample = time_s[k] * audio.clip.frequency;
    while (audio.timeSamples < nSample) yield; // wait till the desired sample
    Instantiate(enemy_s[k-1],myTransform.position,myTransform.rotation);
}

NOTE: time_s must contain the times at which the enemies should appear, not the intervals between them.