Couple of questions regarding instantiate delays

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First question: I have a tank that fires a prefab projectile which is instantiated when i click the mouse button. Is there a way that i can delay the instantiation of the projectile. Sort of like a reload time? Current script:

var rocket : Rigidbody; var speed = 400.0;

function BombsAway () { var rocketClone : Rigidbody = Instantiate(rocket, transform.position, transform.rotation); rocketClone.velocity = transform.forward * speed; }

function Update () { if (Input.GetButtonDown("Fire1")) { BombsAway(); } }

Second question: I'm trying to get objectives pop up on the screen for 5 seconds. I've managed to do it using GUI text on the bottom of the screen which instantiates upon going through a collider, then destroys itself after 5 seconds. However, when it instantiates it duplicates itself for everything that goes through it. Is there a way to only instantiate the text if a tagged object goes through? OR is there a way to delay it so it only instantiates once? Heres the code for one of the trigger colliders:

var prefab : GameObject; var delay = 5.0;

function OnTriggerExit () {

Instantiate (prefab); yield WaitForSeconds(delay); }

Sorry if this all seems confusing, i'm not great at explaining what i'm doing. All of this is really new to me! Thanks for all your help in advance

Answer 1

For the first script, you can either manually track and compare the Time.time value, like this:

var rocket : Rigidbody; var speed = 400.0; var reloadTime = 2.0; private var nextFireTime = 0;

function BombsAway () { var rocketClone : Rigidbody = Instantiate(rocket, pos, rot); rocketClone.velocity = transform.forward * speed; }

function Update () { if (Input.GetButtonDown("Fire1") && Time.time > nextFireTime) { BombsAway(); nextFireTime = Time.time + reloadTime;
 } }

Or you could use a coroutine (which basically means a function that makes use of "yield"), like this:

var rocket : Rigidbody; var speed = 400.0; var reloadTime = 2.0;

function Start() { while (true) { if (Input.GetButtonDown("Fire1")) { BombsAway(); yield WaitForSeconds(reloadTime);
 } yield; } }

function BombsAway () { var rocketClone : Rigidbody = Instantiate(rocket, pos, rot); rocketClone.velocity = transform.forward * speed; }

To make it so your trigger function only creates the instance once, you could use a boolean var, like this:

var prefab : GameObject; private var created = false;

function OnTriggerExit () { if (!created) { Instantiate (prefab); created = true; } }

Or to make it so only objects with a certain tag trigger it:

var prefab : GameObject;

function OnTriggerExit (c : Collider) { if (c.CompareTag("Player")) { Instantiate (prefab); } }

Or to make it so that it only triggers a maximum of once per N seconds:

var prefab : GameObject; var delay = 5.0; private var waitUntil = 0.0;

function OnTriggerExit () { if (Time.time > waitUntil) { Instantiate (prefab); waitUntil = Time.time + delay; } }

Couple of questions regarding instantiate delays

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