Collider doesnt work when I have "is trigger" checked.

Questions & Answers
1

Hi, I am following the Will Goldstone book and part of it makes a collider on a door that should play a sound and animation when you get inside the collider. The collider needs to be a trigger though so you dont run into an invisible wall. My problem is when I check " is trigger" the audio doesnt play. If I uncheck “is trigger” I hit an invisible wall, and the audio plays as it should. Any thoughts? Here is the script:

private var doorIsOpen : boolean = false;
private var doorTimer : float = 0.0;
private var currentDoor : GameObject;
var doorOpenTime : float = 3.0;
var doorOpenSound : AudioClip;
var doorShutSound : AudioClip;

function Update () 
{	
}

function OnControllerColliderHit (hit : ControllerColliderHit)
{
	if(hit.gameObject.tag == "playerDoor" && doorIsOpen == false)
	{
	OpenDoor(hit.gameObject);
	}
}

function OpenDoor (door : GameObject)
{
	doorIsOpen = true;
	door.audio.PlayOneShot(doorOpenSound);
}
3

When the collider becomes a trigger, OnControllerColliderHit events don’t occur anymore - OnTrigger events replace them. You should thus use OnTriggerEnter instead:

function OnTriggerEnter (other: Collider)
{
	if(other.tag == "playerDoor" && doorIsOpen == false)
	{
	OpenDoor(other.gameObject);
	}
}

Notice that the parameter passed to OnTrigger events is other: Collider, which means the other collider/trigger - these events are sent to both objects, and each one receive info about the other object.

2

OnTriggerEnter is your friend:

file:///Applications/Unity/Unity.app/Contents/Documentation/Documentation/ScriptReference/Collider.OnTriggerEnter.html

4

Use “OnTriggerEnter” rather than “OnControllerColliderHit”. And also use “OnTriggerExit” to shut the door.

private var doorIsOpen : boolean = false; 
private var doorTimer : float = 0.0; 
private var currentDoor : GameObject; 
var doorOpenTime : float = 3.0; 
var doorOpenSound : AudioClip; 
var doorShutSound : AudioClip;

function Update () { }

function OnTriggerEnter(collider : Collider) 
{ 
    if(collider.gameObject.tag == "playerDoor" && doorIsOpen == false) 
    { 
         OpenDoor(collider.gameObject); 
    } 
}

function OnTriggerExit(collider : Collider) 
{ 
    if(collider.gameObject.tag == "playerDoor" && doorIsOpen == true) 
    { 
         ShutDoor(collider.gameObject); 
    }
}

function OpenDoor (door : GameObject) 
{ 
    doorIsOpen = true; door.audio.PlayOneShot(doorOpenSound); 
}

function ShutDoor (door : GameObject) 
{ 
    doorIsOpen = false; door.audio.PlayOneShot(doorShutSound); 
}
5

Great, I will update the scripts. I suppose Will was just using some out of date code with the OnCollisionHit function that he put in the book. Thanks guys.