About HMD motion emulation.

[yuma1217]

https://developer.oculus.com/documentation/unity/latest/concepts/unity-hmd-emulation/
I must develop application without OuclusRift, RiftS.
I use OVRCameraRig with OVR Headset Emulator(default)
So, I want to use this feature, but, it doesn't work.

Anyone can us emulation without OculusRift, RiftS?

There is a warning.
```

Virtual Reality SDK Oculus failed to initialize.

Will attempt to enable None instead.

```

[yuma1217]

Now, I plug OculusRiftS, there is not warning. and emulation works good.
So, this emulation needs to use Oculus Rift, or RiftS...
But, I want to use this feature without HMD.