[Solved] Accelerometer calibration on iOS not working

Hi,

I am using the accelerometer in my mobile game. I want the player to hold the phone straight and not flat (like on a table) and calibrate the accelerometer on scene start like this:

Code (CSharp):

1. private void Start()
2. {
3.     Calibrate();
4. }
5.  
6. public void Calibrate()
7. {
8.     Vector3 accelerationSnapshot = Input.acceleration;
9.  
10.     Quaternion rotateQuaternion = Quaternion.FromToRotation(
11.         new Vector3(0.0f, 0.0f, -1.0f), accelerationSnapshot);
12.  
13.     calibrationQuaternion = Quaternion.Inverse(rotateQuaternion);
14. }
15.  
16. void Update()
17. {
18.     Vector3 theAcceleration = Input.acceleration;
19.     Vector3 fixedAcceleration = calibrationQuaternion * theAcceleration;
20.  
21.     movement = new Vector3(fixedAcceleration.x*movementSpeed, fixedAcceleration.y*movementSpeed, 0);
22. }
23.  
24. private void FixedUpdate()
25. {
26.         rb2D.velocity = movement;
27. }

This works perfect on Android but building the iOS version, my gameObject just falls down and I have to tilt the phone flat.

Any idea why this is not working?

Specs:
Unity 2018.4.0f1
iOS 12.3 (iPhone 6s)
Xcode 10.2.1
Accelerometer frequency is 60hz
target minimum iOS is 9.0 in Unity

 

I found out, that the first call to

Input.acceleration;

returns Vector3.zero. Even though I am holding my phone up. I will try to create a small delay. Maybe this will help.

EDIT: Okaaaay... iPhone just needs some more time. I made my script wait for 1 second and then calibrate it. Now it's working.

 

Does it work when you build it to your iPhone?

 

Without waiting a second, it does not work correctly on the iPhone build (6S). But since I am fading the scene for 2 seconds it's okay.