changing volume relative to the spherer collider center??!?

[system]

Hi ya’ll…lets see if i can express myself clear, English is not my native language so… xP.

I’m trying to write a script that when the bullet reaches a trigger it plays a sound…all good.
the tricky part is how can I change the volume of that sound relative to the center of the sphere collider. Say, if the bullet goes right into the center of the object plays at volume 1 and reduces it as it goes away from it. I’m in lack of math skills to do this.
this is what I have not working as I want though…

public var flyByBulletSounds : AudioClip[];
function OnTriggerEnter(hit : Collider){
	if(hit.collider.gameObject.tag == "SoundTrigger"){
		var randomSound : int = Random.Range(0, flyByBulletSounds.length - 1);
		var sphereCollider : SphereCollider =  hit.collider.gameObject.GetComponent("SphereCollider") as SphereCollider;
		
		hit.collider.audio.volume = Mathf.Clamp01(Vector3.Distance(this.gameObject.transform.position, sphereCollider.center));
		hit.collider.audio.clip = flyByBulletSounds[randomSound];
		hit.collider.audio.Play();
		Debug.Log("Bullet entered Trigger playing sound number : " + randomSound + " with Volume : " + hit.collider.audio.volume);
	}	
}

It always plays it at volume 1, because the distance is always the same as it reaches the trigger… what can I do?? Help plzzz

[Tommynator]

To answer your question: use OnTriggerStay() instead of OnTriggerEnter() - as the latter will only be called once (on entering) where the first one will be called continuously.

However I strongly advise you to set up the 3D sound settings of your audio component accordingly (Rolloff Mode, Min/Max distance), as all of the functionality you are trying to simulate is already built in!

Cheers