Instantiate a single object at a set time

Unity Engine
1

I want to instantiate a single object a set time after I collide with another object, and I want to instantiate a second object about two seconds after that, but I’ve been working most of today without managing it. Is it possible?

If I use the code below, then the instantiated objects get created alright, but several instances of the object are created for as long as the clock continues running. Even if I stop the clock at 13 seconds, loads of objects appear in my Hierarchy.

if (hit.gameObject.tag == "cubeMoveRight"  characterTimerRight >10){
Instantiate (Cuberight1);
}
if (hit.gameObject.tag == "cubeMoveRight"  characterTimerRight >12){
Instantiate (Cuberight2);
}

If I use the code below, then I do not get any instantiated objects created at all

if (hit.gameObject.tag == "cubeMoveRight"  characterTimerRight ==10){
Instantiate (Cuberight1);
}
if (hit.gameObject.tag == "cubeMoveRight"  characterTimerRight ==12){
Instantiate (Cuberight2);
}

Can anyone help please, or point me in the right direction.

Thanks.

2

The facts :

  • When you (player) collide with something (first object), two seconds after, an object (second object) is spawned.

Questions :

  • After the spawn, what happens ? Can we still spawn others objects ? Or is it limited to one object ? Or perhaps always limited to one object existing, so it can only spawn again after the existing is dead ?

  • What is your player ? A CharacterController ?

  • What is your object ? A collider ?

3

Do you want the second one to appear only if the objects are still colliding, or no matter what?

4

What is your player ? A CharacterController - Yes?
What is your object ? A collider - the object I’mm colliding with is a collider. The objects being created are not colliding.

Explanation. I’m creating something for someone who can’t read, and so can’t read game instructions.

When my FPC collides with a certain object, then a sound file starts to explain the game. After 10 seconds (to coincide with the sound) a symbol appears on the screen. After another couple of seconds a second symbol appears close to the first symbol. That’s what I want.

What I’m getting using the above code is either loads of symbols appearing, or no symbols appearing.

Hope the explanation helps.

5

So it only triggers once.

var hasBeenTriggered : bool = false;
var triggerCinematic : GameObject;

function OnControllerColliderHit (hit : ControllerColliderHit) {
	if (hit.gameObject == triggerCinematic) {
		// Do the stuff required
	}
}

For timers :

6

Thanks AkilaeTribe. I’m just checking out the WaitForSeconds info. Seems to be what I need. Thanks for pointing me in right direction.

I’d done loads of searches today, but non for “Wait”. Serves me right!

7

Thick or what? Still not got this!

I’m starting with this:

function OnControllerColliderHit (hit : ControllerColliderHit){
if (hit.gameObject.tag == "cubeMoveRight"){
audio.PlayOneShot (moveRight);
characterHit = true;
soundPlayed = "moveRight";
}

Then I’ve tried both of these:

if (hit.gameObject.tag == "cubeMoveRight" ){
yield WaitForSeconds (10);
Instantiate (Cuberight1);
}

if (hit.gameObject.tag == "cubeMoveRight" ){
yield WaitForSeconds (10);
instance = Instantiate (Cuberight1);
}

And I’m finishing with:

function Update () {
if (characterHit) {
characterTimerRight += Time.deltaTime;
}
if (characterTimerRight > 14)
{
characterHit = false;
chracterTimerRight = 0.0;
}

Either of the bits of middle code create “Cuberight1” like I want, but it creates loads of them not just one of them!

Still stuck.

8 
if (state == 0) {
yield WaitForSeconds (10);
instance = Instantiate (Cuberight1);
 state = 1;
  }

This also works … but also creates several instances in Hierarchy not just one.

Seems I’m beat.

9

Finally … Sorted.

Thank you, to those who pointed me in the right direction.

Sorted with a Coroutine

function Start (){
StartCoroutine ("CubeRight1");
yield WaitForSeconds (14);
StopCoroutine ("CubeRight1");
}
function CubeRight1(){
if (state == 0) {
yield WaitForSeconds (10);
instance = Instantiate (Cuberight1);
 state = 1;
if (state == 1) {
yield WaitForSeconds (2);
instance = Instantiate (Cuberight2);
 state = 2;
  }
}
10

Yield ensure your function will continue after the specified point (the yield position).

When you collide for the first time, it meets the yield but do not set state = 1 yet, that’s why it keep repeating detecting a collision with state == 0.

Put state = 1 right after if (state == 0), you are currently making your affectations too late.

Notice you may use a private boolean, instead of a int.