Trouble destroying GameObjects after Instantiating them

Unity Engine
1

Hi,

What I am trying to do is to have a starting sphere that the user has to touch. Once this is done, the starting sphere disappears and 3 spheres appear. The user has to touch them to make theme disappear.

After making the starting sphere disappear, the 3 spheres are instantiated, but when I touch them, they don’t get destroyed.

Here is my script :

public class ExerciceTest : MonoBehaviour
{
    public GameObject startSphere;
    public GameObject sphere;
    public GameObject user;
    private GameObject startSphereClone;
    List<GameObject> sphereList;
    private bool sphereSpawned;

    // Start is called before the first frame update
    void Start()
    {
        sphereSpawned = false;
        startSphereClone = Instantiate(startSphere, new Vector3(0, 17, 8), Quaternion.identity);
    }

    // Update is called once per frame
    void Update()
    {
        if (EcartV3(user.transform.position, startSphereClone.transform.position))
        {
            Destroy(startSphereClone);
            SpawnSpheres(new Vector3(3, 3, 15), new Vector3(-2, 15, 15), new Vector3(6, 19, 18));
            destroySpheresOnContact(sphereList);
        }
    }

    private bool EcartV3(Vector3 a, Vector3 b)
    {
        return Vector3.SqrMagnitude(a-b) < 0.3f;
    }

    private bool SpawnSpheres(Vector3 sphereAPos, Vector3 sphereBPos, Vector3 sphereCPos)
    {
        if (!sphereSpawned)
        {
            GameObject sphereA = Instantiate(sphere, sphereAPos, Quaternion.identity);
            GameObject sphereB = Instantiate(sphere, sphereBPos, Quaternion.identity);
            GameObject sphereC = Instantiate(sphere, sphereCPos, Quaternion.identity);
            sphereList.Add(sphereA);
            sphereList.Add(sphereB);
            sphereList.Add(sphereC);
            sphereSpawned = true;
        }
        return sphereSpawned;
    }

    private void destroySpheresOnContact(List<GameObject>spheres)
    {
        foreach (GameObject sphere in spheres)
        {
            if (EcartV3(user.transform.position, sphere.transform.position))
            {
                Destroy(sphere);
            }
        }
    }
}

It would be very helpful if any of you guys had any idea of what is wrong with my script,

Thank you

2

You call destroySpheresOnContact only if the user is close to the first sphere, but how this can happen if you destroy first sphere? I bet there must be error in console complaining on that line. In the destroySpheresOnContact you should check sphere for null before checking distance because it might be already destroyed.

3

I managed to make it work, thanks for your advice