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

Questions & Answers
1

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!

2

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.