content/docs/other/bigscreen-beyond-driver/_index.md

@@ -12,7 +12,7 @@ You can get the "Bigscreen Beyond Driver" app from Steam working via Proton by f
 
 The "Bigscreen Beyond Driver" and most of its features should be working fine after doing the above!
 
-Note that currently firmware updates do not work.
+Note that currently eye camera firmware loading and updates do not work, but HMD firmware updates do work.
 
 ## Download Windows SteamVR via SteamCMD
 You can easily downlwad the Windows version of SteamVR via SteamCMD. To do this:
@@ -38,4 +38,72 @@ You can also swap modes more easily without using the "Bigscreen Beyond Driver"
    1. `XRT_COMPOSITOR_DESIRED_MODE=0` is the 75hz mode
    2. `XRT_COMPOSITOR_DESIRED_MODE=1` is the 90hz mode
 
-You can verify which modes are which by using a tool like `xrandr` with the HMD plugged in. The top two modes are the relevant ones used here and are listed in order, starting at an index of 0.
+You can verify which modes are which by using a tool like `xrandr` with the HMD plugged in. The top two modes are the relevant ones used here and are listed in order, starting at an index of 0.
+
+## Bigscreen Beyond 1/2/2e `udev` Rules
+
+You may need these udev rules (ie: in `/etc/udev/rules.d/`) for full functionality.
+
+```udev
+# Bigscreen Beyond
+KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0101", MODE="0660", TAG+="uaccess"
+# Bigscreen Bigeye
+KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0202", MODE="0660", TAG+="uaccess"
+# Bigscreen Beyond Audio Strap
+KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="0105", MODE="0660", TAG+="uaccess"
+# Bigscreen Beyond Firmware Mode?
+KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{idVendor}=="35bd", ATTRS{idProduct}=="4004", MODE="0660", TAG+="uaccess"
+```
+
+## Bigscreen Beyond 2e Eyetracking via Baballonia under Linux
+
+### Requirements:
+ * Windows 10/11 dual-boot availability or separate Windows 10/11 machine
+ * Some form of re-streaming the Bigeye camera to bypass broken `v4l`/`uvcvideo` default drivers; `libuvc` is known to work, as does `cameractls` for viewing the cameras as well
+   * ie: `go-bsb-cams` modified from `garymcbay/mjpeg` for this purpose by @lillia
+
+To have functioning eyetracking while using a Bigscreen Beyond 2e under Linux, you will currently need to supplement the Baballonia portion of the software stack via Proton.
+
+The full stack can be pictured as such:
+```mermaid
+graph TB
+   E[Bigscreen Beyond 2e]-->F
+   F[Bigscreen Bigeye]-->A
+   E-->M[Monado]
+   M-->O[OpenComposite]
+   M-->X[XRizer]
+   O-->D
+   X-->D
+   A[go-bsb-cams using libuvc] --> B[Baballonia.Desktop.exe] --> C[VRCFT.Avalonia] --> D[VRChat/etc.]
+   subgraph Linux Native
+   A
+   C
+   E
+   F
+   M
+   O
+   X
+   end
+   subgraph Proton/Wine
+   B
+   D
+   end
+```
+
+`go-bsb-cams` can be found here: https://github.com/LilliaElaine/go-bsb-cams
+
+`Baballonia` releases can be found here: https://github.com/Project-Babble/Baballonia/releases
+
+`VRCFT.Avalonia` releases can be found here: https://github.com/dfgHiatus/VRCFaceTracking.Avalonia/releases
+
+You will need to boot into Windows and use `Baballonia.Desktop` there in order to train any and all models as needed so that you can then transfer them over to your Linux filesystem. They are typically stored at `%APPDATA%/Roaming/ProjectBabble/Models` on Windows and can be loaded from wherever you like via the `Babbalonia.Desktop` GUI.
+
+Then you can start `Baballonia.Desktop.exe` via `Proton` as a "non-steam game" and tell it to load your pre-trained model, the `Baballonia` setup executable can be run first and then you'll want to point the Steam Library entry to the proper `Baballonia.Desktop.exe` afterwards for future launches.
+
+**NOTE:** You'll need to disable `GPU Acceleration` for it to track the full volume as it seems to be weirdly clamped while `GPU Acceleration` is enabled under `Proton`.
+
+`Baballonia.Desktop` can be given the `http://127.0.0.1:8080/stream` endpoints for each camera if you're using `go-bsb-cams` to load the cameras. You'll need to adjust cropping and brightness for the cameras as necessary, but it should allow you to easily select the whole left/right areas automatically for the Bigeye in particular.
+
+Ensure `Baballonia.Desktop` is set to provide `Eye` or `Both` tracking to `VRCFT.Avalonia`, alongside the `Native OSC` option if desired, and then launch `VRCFT.Avalonia`. If successful, you should see some small transfers of data, assuming the `VRCFT-Babble` module is loaded in `VRCFT.Avalonia`.
+
+Assuming all goes well, you should be able to see OSC data coming in with it enabled after launching VRChat under `Proton`. Avatar parameters should load into `VRCFT.Avalonia` and you should see both send/receive values for data rates at this point alongside live results within VRChat itself.