For devices that don't have or can't use a webcam.
In particular, Proton currently doesn't work with webcams, and thus Steam Deck and Linux users like myself cannot utilise Selfie Expression at all even with a webcam plugged in and selected.
Software such as iFacialMocap can track head rotation and send it over the network.
I ask to have at least the avatar head position/rotation controls available to control through OSC so that external programs like VRCFT (and VRCFT.Avalonia on Linux) can pass through that pose info to avatars.
OSC for the hands would be neat for integrating Leap Motion and similar hand tracking solutions "natively" for Desktop users as well, instead of them relying on specialised avatar setups.
Alternatively, a way to run the Selfie Expressions tracking algorithm on another device (for example, a special mode in the VRChat mobile app) and send it in to the desktop app would be nice.
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All I really want is to be able to nod when I'm listening to people, I do it subconsciously and get a little upset when I remember I have to grab my mouse to nod again. Selfie Expression is almost there for me.