[Solved] GameObject jitter using transform.LookAt

I've got a gameObject (health bar) that's childed to a space ship that moves quite rapidly, causing a slight jitter occasionally because the gameObjects transform and scale are constantly being updated in FixedUpdate.

I know the solution has something to do with Quaternions and interpolation, but I don't quite know how to implement it into my code.

Here is the script I'm using.

Code (CSharp):

1. public class statusBar_configuration : MonoBehaviour
2. {
3.     public float scaleDistance;
4.     //default 0, 0, -1
5.     public Vector3 transformRotationVertical;
6.     //default 0,1,0
7.     public Vector3 transformRotationHorizontal;
8.     // FixedUpdate is called every fixed frame-rate frame
9.     void FixedUpdate()
10.     {
11.         AlignStatusBar();
12.     }
13.  
14.  
15.     public void AlignStatusBar()
16.     {
17.         try
18.         {
19.             //scales gameObject relative to camera distance
20.             float dist = Vector3.Distance(Camera.main.transform.position, gameObject.transform.position) * scaleDistance;
21.             gameObject.transform.localScale = Vector3.one * dist;
22.             //modifies transform relative to camera position
23.             gameObject.transform.LookAt(transform.position + Camera.main.transform.rotation * transformRotationVertical, Camera.main.transform.rotation * transformRotationHorizontal);
24.  
25.         }
26.         catch
27.         {
28.  
29.         }
30.     }
31. }
32.  

Object structure and inspector found here.
https://imgur.com/a/baFnk9k

Video found here.
https://vimeo.com/user100950944/review/348931462/1bf711790d

 

Try LateUpdate instead of FixedUpdate.

FixedUpdate is specifically for physics related code, and is called immediately before the physics update. FixedUpdate is called on a regular schedule (default 50 times per second), and is independent of frame rate. There can be several frames or no frames between each FixedUpdate call.

LateUpdate is called immediately after Update every frame, and is good for code which needs to wait until all other code from Update has ran. It is often used for positioning UI windows in world space above characters, moving the main camera, etc.

 

Thanks, your answer lead me to more research and I found the answer. Camera update needs to be the same update as the lookat function. I changed the camera update to FixedUpdate, which solved the problem.