FPS Mouse Input

Unity Engine
1

How can i get the camera’s y axis to stay clamped? I know this code will allow the camera to flip upside down, but i’m not sure how to clamp it correctly.

void HandleInput() {

        float horizontal = Input.GetAxis ("Mouse X") * mouseSensitivity;
        float vertical = -Input.GetAxis ("Mouse Y") * mouseSensitivity;
        vertical = Mathf.Clamp (vertical, -80, 80);

        transform.Rotate (0, horizontal, 0);
        Camera.main.transform.Rotate (vertical, 0, 0);
2

You’re using the camera’s current rotation as the only thing storing the camera’s rotation. I know that sounds sensible, but I’ve always had much better results keeping my own rotX and rotY variables.

Well, OK, I guess you’re pretty safe here with your horizontal (rotY) rotation here. But for the vertical, make your own rotX, which is the rotation angle around the X axis. Use Mathf.Clamp to limit this to a reasonable range, e.g. (-85, 85). Then just set Camera.main.transform.localRotation = Quaternion.Euler(rotX, 0, 0).

3

I did trying using this method before, but now the camera jitters on any Mouse Y movement and wants to stay flat at zero degrees.

void HandleInput() {

        float horizontal = Input.GetAxis ("Mouse X") * mouseSensitivity;
        float vertical = -Input.GetAxis ("Mouse Y") * mouseSensitivity;
        vertical = Mathf.Clamp (vertical, -80, 80);

        transform.Rotate (0, horizontal, 0);
        Camera.main.transform.localRotation = Quaternion.Euler(vertical, 0, 0);
4

That’s because you’re setting the vertical to the input value, instead of adding it. “vertical” needs to be a property, not a local variable. And then line 4 should be

 vertical -= Input.GetAxis("Mouse Y") * mouseSensitivity;
5

Setting both horizontal and vertical as global variables fixed it. Thank you very much.

6

I’m not sure how making the variables global fixed the problem but you should most likely store instance values like JoeStrout mentioned.

Example:

private float xSensitivity = 1.0f;
private float ySensitivity = 1.0f;
private float xClamp = 360.0f;
private float yClamp = 90.0f;
private Vector2 mouseInput = Vector2.zero;

void Update()
{
   this.UpdateMouseInput();
   this.RotateCamera();
}

private void UpdateMouseInput()
{
   this.mouseInput.x += Input.GetAxis("Mouse X") * this.xSensitivity;
   if (this.mouseInput.x < -0.0f) this.mouseInput.x += this.xClamp;
   else if (this.mouseInput.x > this.xClamp) this.mouseInput.x -= this.xClamp;

   this.mouseInput.y -= Input.GetAxis("Mouse Y") * this.ySensitivity;
   if (this.mouseInput.y < -this.yClamp) this.mouseInput.y = -this.yClamp;
   else if (this.mouseInput.y > this.yClamp) this.mouseInput.y = this.yClamp;
}

private void RotateCamera()
{
   this.transform.rotation = Quaternion.Euler(this.mouseInput.y, this.mouseInput.x, 0.0f);
}
7 
      current_Mouse_Look = new Vector2(
        Input.GetAxis("Mouse Y"), Input.GetAxis("Mouse Y"));

      look_Angles.x+= current_Mouse_Look.x * mouseSensitivity * (invert ? 1f : -1f);

this is not working for me it says this:
The name mouseSensitivity does not exist in the current context.
can someone please give a solution.

8

mouseSensitivity is not a built-in thing. It is a property you would add to your own script.