Clamp joystick rotation in Unity

Question

I'm trying to create a mobile joystick using this free package from Unity. Here is the code for rotation which seems to be working fine. I just want to clamp the rotation to +90 or -90 degress. I have tried using the mathf.clamp function but the plane(player) completes a full rotation.

public Joystick joystick;
float rotateVertical;
float rotateHorizontal;

float minClamp = -90.0f;
float maxClamp = 90f;

void Update()
{
    rotateVertical = Mathf.Clamp(joystick.Vertical * 1f, minClamp, maxClamp);

    rotateHorizontal = Mathf.Clamp(joystick.Horizontal * -1f, minClamp, maxClamp);

    transform.Rotate(rotateVertical, 0, rotateHorizontal);
}

If I change the value of minClamp to 0, then the plane doesn't rotate on the negative x axis but is still able to complete a full rotation on the positive x axis. Can someone please help me?

Answer 1

It looks like what you're trying to clamp isn't the joystick input, it's the rotation of the object.

For that, you want to apply something a bit like this:

public float minClamp = -90.0f;
public float maxClamp = 90f;
public float sensitivity = 1f;

Quaternion _initialRoation;
float _pitch, yaw;

void Start() {
    _initialRotation = transform.rotation;
}

void Update() {
    _pitch = Mathf.Clamp(_pitch + joystick.Vertical * sensitivity, minClamp, maxClamp);

    _yaw = Mathf.Clamp(_yaw - joystick.Horizontal * sensitivity, minClamp, maxClamp);

    transform.rotation = _initialRotation * Quaternion.Euler(pitch, yaw, 0);
}