Custom LookAt implementation is marked as Invalid and cannot be saved to prefab

Hi,

We wanted a little different behaviour than the HardLookAt, copied it and changed a minor thing. End results:

Code (CSharp):

1. using Cinemachine;
2. using UnityEngine;
3.  
4. namespace PuttPuttKit.Prototyping
5. {
6.     [DocumentationSorting(DocumentationSortingAttribute.Level.UserRef)]
7.     [AddComponentMenu("")] // Don't display in add component menu
8.     [SaveDuringPlay]
9.     public class HardLookAtWithOffset : CinemachineComponentBase
10.     {
11.         public float HightAboveTarget;
12.        
13.         /// <summary>True if component is enabled and has a LookAt defined</summary>
14.         public override bool IsValid { get { return enabled && LookAtTarget != null; } }
15.  
16.         /// <summary>Get the Cinemachine Pipeline stage that this component implements.
17.         /// Always returns the Aim stage</summary>
18.         public override CinemachineCore.Stage Stage { get { return CinemachineCore.Stage.Aim; } }
19.  
20.         /// <summary>Applies the composer rules and orients the camera accordingly</summary>
21.         /// <param name="curState">The current camera state</param>
22.         /// <param name="deltaTime">Used for calculating damping.  If less than
23.         /// zero, then target will snap to the center of the dead zone.</param>
24.         public override void MutateCameraState(ref CameraState curState, float deltaTime)
25.         {
26.             if (IsValid && curState.HasLookAt)
27.             {
28.                 Vector3 dir = ((curState.ReferenceLookAt + HightAboveTarget * Vector3.up) - curState.CorrectedPosition);
29.                 if (dir.magnitude > Epsilon)
30.                 {
31.                     if (Vector3.Cross(dir.normalized, curState.ReferenceUp).magnitude < Epsilon)
32.                         curState.RawOrientation = Quaternion.FromToRotation(Vector3.forward, dir);
33.                     else
34.                         curState.RawOrientation = Quaternion.LookRotation(dir, curState.ReferenceUp);
35.                 }
36.             }
37.         }
38.     }
39. }

It works perfectly in the editor, but when I try to save it, to the prefab, then it gives

The prefab is not immutable, I can make other changes in it without problems.
When enter prefab mode and trying to save that same change. Then I get:


Is there something I am missing to the extension I made?

Best regards Povl

 

Thank you for the response.
I am having a hard time recreating the problem on a smaller example (Editor 2021.2.8f1 and Cinemachine 2.8.4).
So I tried to create the entire CameraBrain prefab again, and now it works. Should have considered that earlier, luckily we havn't added all parts to it yet, so it wasn't that much work.

My current thought is, there might be a missing script attached to one of the hidden cm game objects. Is there an easy way to verify that? I tried comparing the .prefab files in notepad++, but all the ids are basically different, so can't really pull out which ones are important.

If that is the case, then it would be nice, if it weren't so hidden (just a small feature thought if more hits similar errors ). I did do some renaming of the HardLookAtWithOffset file and maybe one of them was after I had set it on the prefab level?