How do I destroy an object on collision and at the same time trigger a new one to appear, one by one for many objects?

Questions & Answers
1

Hi! I would like to have an object appear in my scene, and once the player collided with it (‘picked it up’), it would disappear and a new object would appear on the scene. Once the player picked this one up, again, a new one would appear, and so on up until 4 or 5 objects. (It’s a bit like a search game and you can look for only one item at the time.)

I manually put down 4 spheres, and put these lines in my player’s movement script:

 void OnTriggerEnter(Collider other) 
{ 
if (other.gameObject.CompareTag("Sphere")) 
{ other.gameObject.SetActive(false); 
} 
}

So what I could achieve with this was that when the game starts, all objects are visible and the player can pick them up one-by-one.

However, I don’t know how to make the objects appear one by one. I understand how to deactivate a single object at Start(), and activate it when an event occurs, I just don’t understand how to do it dynamically when it comes to 4 objects. Could you please give me some advice? Thank you in advance.

2

Hi!

You probably want to store some list of the remaining spheres and activate one of those, then remove it from the list:

public List<GameObject> spheresToCollect;

void OnTriggerEnter(Collider other)
{
    if (other.gameObject.CompareTag("Sphere"))
    {
        other.gameObject.SetActive(false);

        if (spheresToCollect.Count > 0)
        {
            int randomIndex = Random.Range(0, spheresToCollect.Count);
            spheresToCollect[randomIndex].SetActive(true);
            spheresToCollect.RemoveAt(randomIndex);
        }
    }
}

Make sure to assign the spheres in the inspector.

Hope this helps!