[Solved] How to change cinemachine camera transform

You cannot manually set the transforms of the vcams, as they have procedural algorithms to do that and will overwrite what you set.

If you are using the most recent version of CM, you should get what you want by enabling "inherit position" in the vcams:

 

Thank you for the upload.
You need to make a few changes to get this to work:

1. Vcams should not be parented to the main camera with the brain. They can be siblings of a common parent, but they must be independent of each other. You need to correct this in the scene, and in the prefab.
2. Change the Standby Update in the vcams to "Always"
3. When the player suddenly changes position because of wrap-around, you need to call vcam.OnTargetObjectWarped() for all vcams that target it, otherwise they will be confused

I've modified your Test.cs script, to illustrate point #3, and to show you an alternate way to activate the vcams, so that StandbyUpdate == Always will work:

Code (CSharp):

1. using UnityEngine;
2.  
3. public class Test : MonoBehaviour
4. {
5.     public Cinemachine.CinemachineVirtualCameraBase CM1;
6.     public Cinemachine.CinemachineVirtualCameraBase CM2;
7.     public float Speed;
8.     public float Offset;
9.  
10.     private void Start()
11.     {
12.         CM1.MoveToTopOfPrioritySubqueue();
13.     }
14.  
15.     void Update()
16.     {
17.         transform.position += Vector3.forward * Time.deltaTime * Speed;
18.         if (transform.position.sqrMagnitude > Offset * Offset)
19.         {
20.             var delta = -transform.position;
21.             transform.position = Vector3.zero;
22.  
23.             // Inform any vcams that might be tracking this target
24.             int numVcams = Cinemachine.CinemachineCore.Instance.VirtualCameraCount;
25.             for (int i = 0; i < numVcams; ++i)
26.                 Cinemachine.CinemachineCore.Instance.GetVirtualCamera(i).OnTargetObjectWarped(
27.                     transform, delta);
28.         }
29.  
30.         if (Input.GetKeyDown(KeyCode.Q))
31.         {
32.             if (Cinemachine.CinemachineCore.Instance.IsLive(CM1))
33.                 CM2.MoveToTopOfPrioritySubqueue();
34.             else
35.                 CM1.MoveToTopOfPrioritySubqueue();
36.         }
37.     }
38. }

Finally, even if you do all these things, you might still notice an occasional 1-frame hiccup when the camera changes. This is actually a bug in CM, which we will fix for the next release.