Daydream Controller recentering and UE4

[aussieburger]

How to react to recentering by the user with the home button in UE4?

There is mention of it being possible with Unity in the doc: Daydream (3DoF) controller support in Unity  |  Google VR  |  Google for Developers

but nothing for UE4 My game is a 360 game where the menu can appear at any HMD yaw. Recentering with the Daydream controller always moves the HMD back to Yaw 0 which means my menu is then located somewhere else but not centered. Ideally HMD yaw is not changed on a recenter only the controller is recentered to the current HMD yaw. Alternatively we need at least an event.

I also requested some from google side here: https://github.com/googlevr-unreal/UnrealEngine/issues/5
but the issues section there seems dead.

According to the requirements: Daydream App Quality Requirements - Design  |  Google VR  |  Google for Developers

If the app involves your user moving around a 360° environment with no strong notion of which way is “forward” (for example, StreetView), then on recenter your app must preserve the user’s orientation with respect to the environment at the time of the recenter. When the user starts the recenter operation, the app should compute the offset needed to correct the controller’s position, and then, before drawing the next frame, rotate the environment by said offset. From the user’s perspective, the controller is now recentered and their orientation with respect to the environment hasn’t changed. That is, the object that was in front of the user before the recenter is the same object that is in front of the user after the recenter.

unfortunately we do not know when the Home button is pressed so it’s not possible to calculate the offset.

For now I have done a dirty workaround in my blueprints to get it working but it’s definitely not ideal and would not fit to every use case.

Same Answerhub query here: Daydream Controller recentering and UE4 - Programming & Scripting - Epic Developer Community Forums

[nesrak1]

I’ve noticed this too. I’m going to investigate the source code

[aussieburger]

Google answered my query here: https://github.com/googlevr-unreal/UnrealEngine/issues/5

and I found the blueprint node hidden here: