Magic Window

To use "Magic Window" mode:

1. Make sure None is added as one of the Player Settings > XR Settings > Virtual Reality SDKs.
2. At runtime, make sure you switch out of VR mode using VRSettings.LoadDeviceByName(""); yield null;, see SwitchOutOfVr() for an example how to do this, so that Unity no longer updates the camera transform.
3. When you're not in VR mode, you probably want to lock screen rotation to "Landscape Left".
   • See comment in issue 602 for an example of how to change Screen.orientation and Screen.autorotate* properties at runtime through script.
   • To set the non-VR default orientation in Player Settings:
     1. Temporarily disable Player Settings > XR Settings > Virtual Reality Supported so that the Default Orientation properties are editable.
     2. Set Player Settings > Resolution and Presentation > Default Orientation to Landscape Left.
     3. Re-enable Player Settings > XR Settings > Virtual Reality Supported.
4. Use the below controller script, attached to the main camera game object, or ancestor thereof, such as a player game object.

Note, if you see laggy gyro behavior updates using this method, see if your device is affected by Google issue 69360770 (which should help address Unity case 912848).

using UnityEngine;
using UnityEngine.XR;

// Attach this controller to the main camera, or ancestor
// thereof, such as the player game object.
public class GyroController : MonoBehaviour
{
  // Optional, allows user to drag left/right to rotate the world.
  private const float DRAG_RATE = .2f;
  float dragYawDegrees;

  void Start() {
    // Make sure Gyroscope is enabled.
    Input.gyro.enabled = true;
  }

  void Update() {
    if (XRSettings.enabled) {
      // Unity takes care of updating camera transform in VR.
      return;
    }

    // http://android-developers.blogspot.com/2010/09/one-screen-turn-deserves-another.html
    // https://developer.android.com/guide/topics/sensors/sensors_overview.html#sensors-coords
    //
    //     y                                       x
    //     |  Gyro upright phone                   |  Gyro landscape left phone
    //     |                                       |
    //     |______ x                      y  ______|
    //     /                                       \
    //    /                                         \
    //   z                                           z
    //
    //
    //  y
    //  |  z   Unity
    //  | /
    //  |/_____ x
    //

    // Update `dragYawDegrees` based on user touch.
    CheckDrag ();

    transform.localRotation =
        // Allow user to drag left/right to adjust direction they're facing.
        Quaternion.Euler(0f, -dragYawDegrees, 0f) *

        // Neutral position is phone held upright, not flat on a table.
        Quaternion.Euler(90f, 0f, 0f) *

        // Sensor reading, assuming default `Input.compensateSensors == true`.
        Input.gyro.attitude *

        // So image is not upside down.
        Quaternion.Euler(0f, 0f, 180f);
  }

  void CheckDrag() {
    if (Input.touchCount != 1) {
      return;
    }

    Touch touch = Input.GetTouch(0);
    if (touch.phase != TouchPhase.Moved) {
      return;
    }

    dragYawDegrees += touch.deltaPosition.x * DRAG_RATE;
  }