Instantiate during animation goes wrong?

Unity Engine
1

Whenever i try to instantiate object during animation it spawns at completely wrong position and rotation. I’ve never experienced this bizarre behavior…

My rig setup is a GunPivot transform (zeroed out) that is parented to hand bone transform and under that is weapon model + bullet spawn.

Heres the code i use. I use animation event from different script to call it during animation.
Bullet spawns as its supposed to if im using the test in Update(), which is straight out of the barrel.
BUT whenever i do it during shoot animation its as if the parented object didnt move with the hand even though it does in the editor window. I’ve attached picture visualizing this. Im not sure if its just coincidence but the wrong spawn position is very close to the position of barrel in idle position. I also checked that i didnt accidentally keyframe something in the gun but thats not the case.

(Link to the picture since images dont seem to work on this forum…)

[Album] imgur.com 
public class GameObjectSpawner : MonoBehaviour
{
    public GameObject prefab;

    public bool test;

    private void Update()
    {
        if (test)
        {
            test = false;
            SpawnObject();
        }
    }

    [Tooltip("Use this gameObject as parent?")]
    public bool useParent = false;

    public void SpawnObject()
    {
        if (!useParent)
        {
            GameObject go = Instantiate(prefab) as GameObject;
            go.transform.position = transform.position;
            go.transform.rotation = transform.rotation;
            //go.transform.rotation = Quaternion.LookRotation(transform.forward);
            Debug.Break();
        }
        else
        {
            GameObject go = Instantiate(prefab, this.transform);

        }
    }
}
2

Unity animation reset all bones every frame to their original position and then set to current frame position. The reset happens at the beginning of the frame, before Update calls, and the calculation of current bone positions and IK (if any) happens inbetween Update and LateUpdate. Either instantiate your object as bone child or copy bone position and rotation in LateUpdate

2 Likes
3

Thanks for the reply!

I came up with this solution but its not perfect since its not being called on the exact frame so the bullet goes always in slightly wrong direction. Setting up position and rotation in LateUpdate had similar effect.

Is there a better way to do it?

    IEnumerator SpawnAtEndOfFrame()
    {
        yield return new WaitForEndOfFrame();
        GameObject go = Instantiate(prefab) as GameObject;
        go.transform.position = gameObject.transform.position;
        go.transform.rotation = gameObject.transform.rotation;

    }

EDIT: OK it seems that also animator.CrossFade(); affected when its being called, after making it lower it seems to work just fine.

1 Like
4

I know this is a dead post but I had a similar problem and struggled to find an answer, so if anyone has the same issue - the fix for me was to change animator update mode to AnimatedPhysics.