Instantiated Prefab Spawns With Unwanted Offset

Unity Engine
,
1

I am working on a 3D axe-throwing game, when an axe hits the target, a fractured prefab of the target with multiple children with rigidbody components is spawned and the old model is destroyed. Although when the fractured prefab is spawned it has a noticeable Y offset. From what I have read I don’t know if it is to do with the rigidbodies of the fractured prefab or to do with floating point numbers.

Target Destruction Code:

   void Hit()
    {
       
        targetManager.TargetRemoved();
        score.IncreaseScore(targetManager.defaultScore);
        if(settingsManager.canVibrate)
        {
            Handheld.Vibrate();
        }
       
        Despawn();

    }

    void Despawn()
    {
      
  
       GameObject brokenObject = Instantiate(brokenTarget, transform.position, Quaternion.Euler(0, 90, 0), null);
        Destroy(gameObject);


    }

Full Script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Target : MonoBehaviour
{
    bool hasBeenHit;
    TargetManager targetManager;

    [SerializeField]  float offsetAmount;

    [SerializeField] GameObject brokenTarget;

    Score score;

    GameManager gameManager;
    SettingsManager settingsManager;


    [SerializeField] float distanceMoved;
    [SerializeField] bool isMovingTargetHorizontal;
    [SerializeField] bool isMovingTargetVertical;

    [SerializeField] List<AudioClip> hitClips;
    [SerializeField] AudioSource audioSource;

   



    private void Start()
    {
       
        gameManager = GameObject.FindGameObjectWithTag("Game Manager").GetComponent<GameManager>();
        targetManager = GameObject.FindGameObjectWithTag("Target Manager").GetComponent<TargetManager>();
        settingsManager = GameObject.FindGameObjectWithTag("SettingsManager").GetComponent<SettingsManager>();


        distanceMoved = 0;


        int moveNumX = Random.Range(0, 2);
        int moveNumY = Random.Range(0, 2);

        print(moveNumX);
        print(moveNumY);
        if (moveNumX == 1)
        {
            isMovingTargetHorizontal = true;
        }
        if (moveNumY == 1)
        {
            isMovingTargetVertical = true;
        }

        if (isMovingTargetHorizontal)
        {
            MoveTargetHorizontal();
        }
        if (isMovingTargetVertical)
        {
            MoveTargetVertical();
        }
    }


    private void OnCollisionEnter(Collision collision)
    {
        score = GameObject.FindGameObjectWithTag("Score Text").GetComponent<Score>();

        if (collision.transform.tag == "Axe" && !hasBeenHit)
        {
           int randNum = Random.Range(0, hitClips.Count);
            audioSource.clip = hitClips[randNum];
            audioSource.Play();
            Invoke("Hit", audioSource.clip.length);
            hasBeenHit = true;
            gameManager.AddAxes(1);
        }
    }


   void Hit()
    {
       
        targetManager.TargetRemoved();
        score.IncreaseScore(targetManager.defaultScore);
        if(settingsManager.canVibrate)
        {
            Handheld.Vibrate();
        }
       
        Despawn();

    }

    void Despawn()
    {
      
  
       GameObject brokenObject = Instantiate(brokenTarget, transform.position, Quaternion.Euler(0, 90, 0), null);
        Destroy(gameObject);


    }

    void MoveTargetHorizontal()
    {
       
       LeanTween.moveX(gameObject, Random.Range(-2, targetManager.maxDistance), Random.Range(1, targetManager.maxTargetSpeed)).setLoopPingPong();
       

    }
    void MoveTargetVertical()
    {

        LeanTween.moveY(gameObject, Random.Range(-2, targetManager.maxDistance), Random.Range(1, targetManager.maxTargetSpeed)).setLoopPingPong();


    }

}

Any help would be greatly appreciated!

2

If you open your prefab, you can see what offset your objects will be at. Anything at the origin will be where you spawn your object.

3

Thanks for the response, I have the broken target prefab sitting at a position of 0,0,0. I have also just tried setting the Y to a negative value to see if that would fix it, but that did not fix it.

4

Perhaps your geometry is not centered where you expect it.

Open the prefab again and toggle the Center / Pivot and Global / Local buttons to see what’s going on.

If this is the case, here is how to fix:

  • edit the geometry with a 3D program, OR

  • remake the prefab with a blank GameObject to help you offset the geometry back where it belongs.

1 Like
5

This fixed it! The pivot was a lot lower than the geometry, and moving the children to the pivot fixed the problem. Thank you!

1 Like