Why is the Camera bouncing on the X-Axis?,Why does the Camera jump around on the X-Axis?

Question

Hello,

I am new at Unity and after watching multiple tutorials, I created this script to make a smooth FPS-Cam:

     public class CamMovement : MonoBehaviour
 {
     private float MouseSensivity;
     public float MaxY;
     public float MinY;
     public Transform Bodytrans;
     float xRotation;
     float yRotation;
     public Slider SensivitySlider;
     public float SpinSpeed;
 
 private void Start()
     {
         Cursor.lockState = CursorLockMode.Locked;
         SensivitySlider.value = 100;
     }
 
 void SetSliderValues(){...}
 
 void CursorLock(){...}
 
 void CamRotate()
   {
 float mouseX = Input.GetAxis("Mouse X") * MouseSensivity *
 Time.deltaTime;
 float mouseY = Input.GetAxis("Mouse Y") * MouseSensivity *
 Time.deltaTime;
 
         xRotation -= mouseY;
         yRotation += mouseX;
         xRotation = Mathf.Clamp(xRotation, MinY, MaxY);
         Quaternion RotationY = Quaternion.Euler(xRotation,0, 0);
         Quaternion RotationX = Quaternion.Euler(0, yRotation, 0);
         transform.localRotation = Quaternion.Lerp(transform.localRotation, RotationY, SpinSpeed * Time.deltaTime);
         Bodytrans.rotation = Quaternion.Lerp(Bodytrans.rotation, RotationX, SpinSpeed * Time.deltaTime);
  }
 
 void Update()
    {
         CamRotate();
         CursorLock();
         SetSliderValues();
     }
 }

The Problem: The Cam keeps bouncing on the X-Axis when moving at fast speed. Example: I move the Cam to the right with high MouseSensivity. The mouse now bounces back to the left. This only occurs at high speed.

I have tried using Bodytrans.Rotate() instead of Quaternion.Lerp() first; This does remove the bouncing, but it also causes a weird stuttering, like the Camera is skipping frames. If Bodytrans.Rotate() is the right choice, how do you remove the stuttering?

Thanks in advance!

Answer 1

Hey, sorry to bring up an old post but I was having the same problem and decided to reply in case others do too. I believe the bouncing happens because when x input value goes over 1 with a high multiplier (effectively sensitivity setting) unity takes it as a high rotation input (e.g. 390) and when it converts it into a quaternion it ends up ignoring the full rotation and trying instead to Lerp/Slerp to 30 (390 - 360). You end up getting it attempting and accelerating to lerp a full rotation then hitting it's target and bouncing off in the following frame.

As a solution I ended up clamping the amount of input you can have on the x axis. It makes it more sluggish to respond, and may not work well for an FPS, but keeps the camera from ping ponging.

 if (Input.GetMouseButton(0)) {
         xDeg += Mathf.Clamp(Input.GetAxis("Mouse X"), -0.99f, 0.99f) * xSpeed * moveSpeed;
         yDeg -= Input.GetAxis("Mouse Y") * ySpeed * moveSpeed;
         //Clamp the horizontal axis for the orbit
         xDeg = ClampAngle(xDeg, xMinLimit, xMaxLimit);
         //Clamp the vertical axis for the orbit
         yDeg = ClampAngle(yDeg, yMinLimit, yMaxLimit);
         OrbitCamera(xDeg, yDeg);
 } else {
         OrbitCamera(xDeg, yDeg);
 }

If someone else knows a better way to handle this, or if it's caused by something other than the vector3/quaternion conversion please let me know.

Why is the Camera bouncing on the X-Axis?,Why does the Camera jump around on the X-Axis?

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