The scene jitter while controling camera's position and rotation by scripts

“If you want to control the Camera's position directly by script after it has a CM Brain, create a passive Virtual Camera (i.e. a CinemachineVirtualCamera with Do Noting in both Aim and Body), make it high priority to make it drive the main camera, then have your script control its position, rotation, and FOV.”By Gregoryl.
I set the "Body" as "Do Nothing" and set the "Aim" as "Do Nothing",then control the camera's position and rotation directly by scripts in Update.But the scene jitter.How can i solve this ?

 

I control a GameObject(CarBody) position by Cinemachine Dolly Cart and the Update Method is "Update". The CinemachineBrain's Update Method is "Late Update" and Blend Update Method is also "Late Update".My motion scripts is bind on the Do Nothing VCam.There is still Scene jitter.How can I solve this?

I control a gameObject(CarBody) by Cinemachine Dolly Cart.Its Update Method is "Update". The CinemachineBrain's Update Method is "Late Update" and its Blend Update Method is "Late Update".I bind the motion scripts on a Do Nothing VCam and set it as live Cam.There is still Scene jitter.How can i solve this?
Follow is the motion script.

Code (CSharp):

1. void LateUpdate()
2.     {
3.         this.transform.rotation = originalCam.transform.rotation;
4.         this.transform.position = carBody.transform.position;
5.         Vector3 originalRelativePos = this.transform.InverseTransformPoint(originalCam.transform.position);
6.         Vector3 presentRelativePos = new Vector3(-originalRelativePos.x, originalRelativePos.y, originalRelativePos.z);
7.         Vector3 presentAbsolutePos = this.transform.TransformPoint(presentRelativePos);
8.         this.transform.position = presentAbsolutePos;
9.     }

 

I want to get the effect like video1.When the car turn left, we can see the left side of the car and the car is to the right of the center of the screen.
originalCam is a VCam that Transposers to the car and composers to the car.
But the result of the originalCam is when car turn left,we can see the left side of the car and the car is to the left of the center of the screen.
So I calculate a new transform by originalCam and car and then assign the transform to a Do Nothing VCam.I get the effect I want .But there is Scene Jitter. like Video 2.

 

It works! Thank you.While I find that sometime when the car go forward,the cam also towards the left or right side.I try to set the "Lock to target with World Up"Binding Mode in the transposer and set the Yaw Damping and think it will be more meet my needs.In addition.If I want to tracking one vcam with another for other cases ,how can I correct the order of the evaluation?

 

I see. Thank you very much!