Question Face the Camera, Object.

My project uses a simple billboard script to cause objects to face a target camera.

The issue occurs when the target camera jumps from one position to another. Upon arriving at the new position, a frame is sometimes rendered with the objects facing the previous position. This manifests as a flicker when viewed in real time.

The behavior in real time:

Scrubbing through the third transition where the behavior occurs:

The billboard script is extremely simple, and is place on any object whose y axis rotation is dependent upon the camera. The same result occurs whether it is in update or fixed update.

Code (CSharp):

1.     void LookAtOrient()
2.     {
3.         var cameraPosition = cameraTransform.position;
4.         cameraPosition .y = transform.position.y;
5.         transform.LookAt(cameraPosition );
6.     }
7.  

Any ideas on how I could solve this?

 

Thank you for your diagnosis and suggestions Gregoryl!

Your first proffered solution works! I will stress test it later when I get a chance.

For anyone else that might use this advice:

Changing script execution order: https://docs.unity3d.com/Manual/class-MonoManager.html
Script example

Code (CSharp):

1.    
2. [ExecuteInEditMode]
3. public class Billboard : MonoBehaviour
4. {
5. //...
6.     [SerializeField]
7.     Transform targetTransform;
8.     private void LateUpdate()
9.     {
10.         LookAtOrient();
11.     }
12.  
13.     void LookAtOrient()
14.     {
15.         var target = targetTransform.position;
16.         target.y = transform.position.y;
17.         transform.LookAt(target);
18.     }
19. }
20.  

Thanks again Gregoryl!