set rotation does not work in current frame, I have to force the rotation in the next frame update.

Unity Engine
,
1

Hello, I recently upgraded the Engine from 5.6.5 → 2019.4.4f1 (64bit)
And I found a series bug. In my game, there are many skills that will automatically face the enemy.
But it does not work now. Therefore I created a simple project to test this issue. Please download the attached project and open it by Unity 2019.4.4f1.

  1. Load Scene/SampleScene.
  2. Press “Play” button.
  3. Press “X” key to see the bug.

Fortunately, if you uncomment the line #61 to set the rotation in the “NEXT” frame update. It works!!!
Is there anything wrong with the Rotation update? Thanks for your time.

6140238–670071–BugTest01.zip (404 KB)

2

Post the code using tags. You may just be using some obsolete methods.

3

Thank you very much for your suggestion.
BTW, I forgot to remove an unused script named CharacterScript.cs. Please ignore this script.

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

public class MyPlayerController : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
       
    }

    // Update is called once per frame
    void Update()
    {
        if(Input.GetKeyDown(KeyCode.X))
        {
            Animator anim = gameObject.GetComponent<Animator>();
            if(anim != null)
                anim.SetTrigger("attack");
        }
       
    }

    public void setFaceDir(Vector3 dir)
    {
        Quaternion quat = Quaternion.FromToRotation(Vector3.forward, dir);
        gameObject.transform.rotation = quat;
        // Debug Log
        Debug.Log("setFaceDir(): dir = " + dir.ToString());
    }

    void AnimEvent_AutoFaceEnemy()
    {
        GameObject found_obj = GameObject.FindWithTag("Enemy");
        if (found_obj != null)
        {
            Vector3 dir = found_obj.transform.position - gameObject.transform.position;
            dir.y = 0.0f;
            dir.Normalize();
            setFaceDir(dir);
            // log character direction in 3 frames
            StartCoroutine(LogCharacterDirection(dir, found_obj));
        }
    }

    IEnumerator LogCharacterDirection(Vector3 dir, GameObject found_obj)
    {
        // Log character dir (frame 0)
        {
            Vector3 cur_chardir = gameObject.transform.rotation * Vector3.forward;
            Debug.Log("------------------------------------------------------");
            Debug.Log(Time.time.ToString() + ">>> found " + found_obj.name.ToString() +
                ", cur_facedir = " + dir.ToString() +
                ", cur_chardir = " + cur_chardir.ToString());
        }

        yield return null;

        // Uncomment this line to get the correct result.
        //setFaceDir(dir);

        // Log character dir (frame 1)
        {
            Vector3 cur_chardir = gameObject.transform.rotation * Vector3.forward;
            Debug.Log(Time.time.ToString() + ">>> found " + found_obj.name.ToString() +
                ", cur_facedir = " + dir.ToString() +
                ", cur_chardir = " + cur_chardir.ToString());
        }

        yield return null;

        // Log character dir (frame 2)
        {
            Vector3 cur_chardir = gameObject.transform.rotation * Vector3.forward;
            Debug.Log(Time.time.ToString() + ">>> found " + found_obj.name.ToString() +
                ", cur_facedir = " + dir.ToString() +
                ", cur_chardir = " + cur_chardir.ToString());
        }
    }

}