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Question by Patrice_VAC · Sep 15, 2020 at 01:46 PM · oculustrackingscriptingproblem

Reverse head tracker output around y axis

Hi, I am using Unity 5.3 and the oculus DK2 to prepare an experiment in psychology (so, as you can guess, I am not a developper). I would like to display a Unity scene flipped upside-down (not rotated) in the oculus. Following somes responses on Unity Answer, I attached the following code to the camera and it works well.

 public class Mirrorcam : MonoBehaviour {
     Camera MyCam; 
     void OnPreCull () {
         MyCam = GetComponent<Camera>();
         MyCam.projectionMatrix = MyCam.projectionMatrix * Matrix4x4.Scale(new Vector3(1,-1,1));
         MyCam.SetStereoProjectionMatrices(MyCam.projectionMatrix, MyCam.projectionMatrix); 
     }
     void OnPreRender () {
         GL.invertCulling = true;
     }
 }  

Now the scene is upside down but obviously we look on the left of the scene when turning the head on the right and vice versa. So I need to reverse the output of the oculus head tracker around the y axis. Again following some advices, I created an empty object as a parent for the camera and attached the following code to the object :

 public class MirrorTracking : MonoBehaviour {
    void Update () 
     {
     Quaternion angles = InputTracking.GetLocalRotation(VRNode.CenterEye);
     transform.rotation = Quaternion.Euler(-2*angles.eulerAngles.x,angles.eulerAngles.y,-2*angles.eulerAngles.z);
     }
 }

It works relatively well (it is a bit unstable) as long as head movements are not too large. But when looking too far up and down, the camera starts spinning around. As I plan to have my participants in a supine position, it won't work... From what I read on the unity forum, I guess its because I am treating the element of a quaternion as euler angles but I don't know the math to do better. Is there another way to reverse head tracking data on one axis? Thank you for your help.

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