Why isn't my rotation smooth?

Question

I'm currently working on a twin stick shooter but I encountered a problem when I rotate my player. The rotation snaps to right angles. I'm guessing it's a problem, due to the value that the joystick gives me back. Here is a screen recording, via Giphy.

How do I go about fixing this problem?

This is my code:

 void FixedUpdate()
{

    float hR = gamepad.GetStick_R().X;
    float vR = gamepad.GetStick_R().Y;

    float lastHR = hR;
    float lastVR = vR;
    // This part was added recently in the hope of smoothing the rotation
    float lerpHr = Mathf.Lerp(lastHR, hR, Time.deltaTime * speedRotation);
    float lerpVr = Mathf.Lerp(lastVR, vR, Time.deltaTime * speedRotation);

    PlayerRotation(lerpHr, lerpVr);
}

void PlayerRotation(float h, float v)
{
    rotation.Set(h, 0f, v);

    if (rotation != Vector3.zero)
    {
        currentRotation = Quaternion.LookRotation(rotation);
        playerRigidbody.MoveRotation(currentRotation);
        lastRotation = currentRotation;
    }
    else
        playerRigidbody.MoveRotation(lastRotation);
}

I also tried two other ways, but each time, I got the same results. I tried every way I could think of, with these lines of code. I don't know where else to look.

// Attempt Two
playerRigidbody.transform.rotation = Quaternion.Slerp(p
    layerRigidbody.transform.rotation, currentRotation, Time.time * speedRotation);

// Attempt Three
transform.eulerAngles = new Vector3(0, Mathf.Atan2(v, h) * 180 / Mathf.PI, 0);

Answer 1

Unity uses an axial dead zone this causes the joystick to "snap" at 90 degrees (up, down, left, right). What you need is a radial dead zone.

First, you need to go into the Unity Input Manager and set the dead zone ("dead") value to zero (0), to disable their axial dead zone.

Then, do your own radial dead zone:

float hR = gamepad.GetStick_R().X;
float vR = gamepad.GetStick_R().Y;

float deadzone_squared = 0.1f * 0.1f;

// calculate and compare magnitude squared (skip the square root)
if((hR * hR + vR * vR) < deadzone_squared)
{
  hR = 0;
  vR = 0;
}

This will create a deadzone that is a circle, rather than a cross.