How to use StartCoroutine when a certain event happens until a certain event happens?

Unity Engine
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1

So I am trying to make a projectile that when hitting a object it goes back to the player. Can someone tell me how to run the StartCoroutine function when a event happens until another event happens?

2

Any reason you’re not just using a tweener to bring back your boomerang??

I use iTween because it’s super-simple, one file.

Otherwise, make the coroutine run until it detects the target is back at its destination, which is precisely what tweeners already do.

3

You can have a bool in your script that is true when the coroutine should be active and false when not. Let’s call this bool coroutineActive. In your coroutine method you can then use:

while(coroutineActive) { }
or
if (!coroutineActive) yield break;

You can also just call StopCoroutine(), probably simpler this way actually.

4

I did not know iTween existed
How would I use it in this code to make stuff bounce back to the player?

private void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.layer == 6) return;
        if (targetHit) return;
        else targetHit = true;
        Debug.Log("hit");
        rb.linearVelocity = Vector3.zero;
        rb.angularVelocity = Vector3.zero;
        transform.LookAt(player.transform);
        StartCoroutine(RightBackAtYa(Player));
    }
    public IEnumerator RightBackAtYa(GameObject player)
    {
        transform.position += (player.transform.position - transform.position).normalized * speed * Time.deltaTime;
        transform.LookAt(player.transform);
        yield return null;
    }
}
5

You should play with it… tweening is FUN!!

As soon as you start tweening your brain will start thinking of new game ideas.

It would be something like:

iTween.MoveTo( boomerangGameObject, destinationVector3, durationFloat);

That’s the simple and convenient “go here in this amount of time” variant.

The full variant accepts a hash table that can be populated with a ridiculous number of various arguments, such as this simple example I use for moving a card to a discard pile and calling a method:

				iTween.MoveTo(card.gameObject, iTween.Hash(
					"position", DiscardPile.position,
					"easeType", "easeOutQuart",
					"time", travelTime,
					"delay,", delay,
					"oncomplete", "Completed"
					));

You might want to also set your Rigidbody to Kinematic during the duration, but sure what all you’re attempting to do there.

1 Like
6

Thank you iTween is very useful

1 Like
7

BTW - if you just want to send the object back in the direction it came from then you can do this:

    void OnCollisionEnter(Collision collision)
    {
        rb.linearVelocity = collision.relativeVelocity;
    }