Play sound once on collision

Questions & Answers
1

The question was asked many times. The problem is: when running this code (attached to CharacterController)

var snd : AudioClip;
var played : boolean;

function OnControllerColliderHit(hit : ControllerColliderHit)
{

    if(!played)
    {
        audio.PlayOneShot(snd);
        played = true;
    }
}

→ you’re able to play collision sound just once. What if I collide again? No sound will be played (need to reset played flag). I tried OnCollisionExit() to reset the flag (played = false) but it doesn’t work for CharacterController. Another possible solution - reset played flag depending on time:

function Update()
{
    timeUntilNextPlayback += Time.deltaTme;
    if(timeUntilNextPlayback > SOME_AMMOUNT_OF_TIME)
      played = false;
}

→ but it’s not the best possible solution.
Does anyone no way to acomplish this task OR check when collision exits with my CharacterController? (I must not Destroy() any object)

2

If you want to play it just once on collision, you could use trigger collision.

AudioClip snd;
bool played;

vois Start(){
   played = false;
}
void OnTriggerEnter(Collider col) {
   if(played == false){
      audio.PlayOneShot(snd);
      played = true;
   }
}

void OnTriggerExit(Collider col){
   played = false;
}
3

Maybe we can compare current hit point and previous one. If they equal => play nothing. But still not the best sollution.

#pragma strict
var snd : AudioClip;
var played : boolean;
var hitPoint : Vector3;


function OnControllerColliderHit(hit : ControllerColliderHit)
{
    if(CompareVector3(hitPoint, hit.point))
	    played = false;
	if(!played) 	
	{
	    audio.PlayOneShot(snd);
	    played = true;
	}
    hitPoint=hit.point;
}

function CompareVector3(vecOne : Vector3, vecTwo : Vector3) : boolean
{
	return Mathf.Approximately(vecOne.x, vecTwo.x) && Mathf.Approximately(vecOne.y, vecTwo.y) && Mathf.Approximately(vecOne.z, vecTwo.z);
}