Adding a delay to my OntriggerEnter

Questions & Answers
1

Hi all, I want to add a delay to a ParticleEmitter that goes off when the player enters the trigger.

Im not sure how to go about it.

Heres the current code

var particles : ParticleEmitter;
 
function OnTriggerEnter (other : Collider){
    if(other.gameObject.FindWithTag("Player")){    
        particles.emit = true;      
    } else{
        particles.emit = false;
    }
}
    
   
function OnTriggerExit (other : Collider){
    if(other.gameObject.FindWithTag("Player")){    
        particles.emit = false;      
    } else{
        particles.emit = false;
    }
}
2

You can either use a coroutine with yield WaitForSeconds or you can set particles.emit = true; in a separate method, which you can then call via Invoke with a delay.

3

First, your OnTriggerExit function has no difference between the true and false cases – you probably want to fix that.

Second, FindWithTag isn’t the normal way to do collision detection, normally you check the name like so:`

function OnCollisionEnter (col : Collision)
{
    if(col.gameObject.name == "Player")
    {
        Destroy(col.gameObject);
    }
}

I got these examples straight from the scripting reference. You should check there first, as it’s a really good resource.

These are the basic ideas; obviously change it to match your problem.

Do ();
print ("This is printed immediately");

function Do () {
    print("Do now");
    
    yield WaitForSeconds (2);

    print("Do 2 seconds later");
}

Or if you want the code to wait until it’s finished executing:

yield StartCoroutine("Do");
print("Also after 2 seconds");

print ("This is after the Do coroutine has finished execution");

function Do () {
    print("Do now");

    yield WaitForSeconds (2);

    print("Do 2 seconds later");
}

So for you, it’d be something like this:

var particles : ParticleEmitter;
var waitSeconds = 1;
 
function OnTriggerEnter (other : Collider){
    yield WaitForSeconds (waitSeconds);

    if(other.gameObject.FindWithTag("Player")){
        particles.emit = true;      
    } else{
        particles.emit = false;
    }
}
 
 
function OnTriggerExit (other : Collider){
    yield WaitForSeconds (waitSeconds);

    if(other.gameObject.FindWithTag("Player")){    
        particles.emit = false;      
    } else{
        particles.emit = true;
    }
}

Note that I haven’t tested this code, as I normally program in C#.