Question Particle rotation always wrong on one axis when using Emit()

I'm trying to use the ParticleSystem to render decal and impact effects, but I'm unable to properly align the particle with the geometry in the world. There is always one axis where the particle is rotated incorrectly.

I've implemented a second version by spawing a quad gameobject for each decal and it just works as expected. However, I'm unable to implement the same thing with a particle system and I can't figure out what I'm doing wrong.

I've recorded a video where I go over my test case, which is attached to this post. Any help is appreciated.

Thanks in advance!
PS: I'm using 2019.4.9f1

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class NewBehaviourScript : MonoBehaviour
6. {
7.     [SerializeField] bool m_UseParticleSystem = default;
8.     [SerializeField] ParticleSystem m_ParticleSystem = default;
9.     [SerializeField] GameObject m_Quad = default;
10.  
11.     void Start()
12.     {
13.     }
14.  
15.     void Update()
16.     {
17.         if (!Input.GetButtonDown("Fire1"))
18.             return;
19.  
20.         RaycastHit hit;
21.         var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
22.         if (!Physics.Raycast(ray, out hit))
23.             return;
24.  
25.         Debug.DrawLine(hit.point, hit.point + hit.normal * 0.25f, Color.blue, 1000);
26.  
27.  
28.  
29.         if (m_UseParticleSystem)
30.         {
31.             var position = hit.point + hit.normal * 0.01f;
32.             var rotation = Quaternion.LookRotation(hit.normal);// * Quaternion.AngleAxis(90, Vector3.Cross(hit.normal, Vector3.forward));
33.  
34.             var emit = new ParticleSystem.EmitParams();
35.             emit.position = position;
36.             emit.rotation3D = rotation.eulerAngles;
37.             emit.startColor = new Color32((byte)Random.Range(0, 255), (byte)Random.Range(0, 255), (byte)Random.Range(0, 255), 255);
38.             m_ParticleSystem.Emit(emit, 1);
39.         }
40.         else
41.         {
42.             var position = hit.point + hit.normal * 0.01f;
43.             var rotation = Quaternion.LookRotation(hit.normal) * Quaternion.AngleAxis(180, Vector3.Cross(hit.normal, Vector3.forward));
44.  
45.             var quad = Instantiate<GameObject>(m_Quad);
46.             quad.transform.SetPositionAndRotation(position, rotation);
47.         }
48.     }
49. }
50.  

 

Thank you for the quick reply!

I just submitted bug-report:
(Case 1284152) 2019.4: Particle rotation always wrong on one axis when using Emit

I messed up the report a bit, I forgot to attach the video. However, I included a link to this forum thread. I hope the report passes QA

 

Just received an email, QA was able to reproduce the issue:
https://issuetracker.unity3d.com/is...se-wrong-rotation-on-one-axis-when-using-emit

 

Do you know if this gets fixed in 2019.4 or should I look for workarounds? I'm asking, because it blocks me.

 

Thank you for the help. Yes, it fixes things for me, I just tested it. I'm glad it turned out that simple