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add wivrn-lighthouse guide

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content/docs/fossvr/wivrn/_index.md
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@ -15,4 +15,38 @@ It's very similar in purpose to [Monado](/docs/fossvr/monado/), but for standalo
Current limitations are a fixed bitrate and network protocol streaming only, please ensure your headset is on a stable network or utilize an ethernet adapter to your headset to operate in a quasi-wired mode.
Should you utilize [Envision](/docs/fossvr/envision/) for WiVRn setup, please ensure your APK and WiVRn server match as closely as possible. Check the WiVRn github [actions](https://github.com/WiVRn/WiVRn/actions) for an APK matching your server build to install to your headset.
Should you utilize [Envision](/docs/fossvr/envision/) for WiVRn setup, please ensure your APK and WiVRn server match as closely as possible. Check the WiVRn github [actions](https://github.com/WiVRn/WiVRn/actions) for an APK matching your server build to install to your headset.
## WiVRn + Lighthouse driver
This section covers using WiVRn with any lighthouse-tracked device: Index/Vive controllers, Vive/Tundra trackers, etc. Important steps are marked with 🔴.
🔴 Have SteamVR installed (no need to run it).
🔴 In Envision, set WiVRn Profile as such:
- XR Service CMake Flags:
- `WIVRN_FEATURE_STEAMVR_LIGHTHOUSE=ON`
- Environment Variables:
- `WIVRN_USE_STEAMVR_LH=1`
- `LH_DISCOVER_WAIT_MS=6000`
🔴 Perform a **Clean Build** after changing these!
If not using Envision, simply pass `-DWIVRN_FEATURE_STEAMVR_LIGHTHOUSE=ON` to cmake and export the env variables before starting `wivrn-server`.
🔴 Grab [Motoc](/docs/fossvr/motoc/), this can calibrate the two tracking technologies to work together.
Discovery happens only on first connection, so be sure to **have all lighthouse devices powered on and in line of sight of base stations before connecting the headset!**
Once a device is discovered, it may be powered off and then back on later.
🔴 Once video appears in the headset, check `motoc monitor` to make sure your devices all show up.
If one or more devices are missing, try:
- Spread the devices out more; lighthouse devices get discovered quicker if they're not piled up on each other. Simply strapping them on is good, too.
- Increase `LH_DISCOVER_WAIT_MS`, though this delays the client on first connection.
To re-discover devices, restart WiVRn server.
At this point, your lighthouse devices will be randomly floating about somewhere. To calibrate them, follow the guide in the [Motoc README](https://github.com/galister/motoc/blob/main/README.md).