Opentrack UDP-Output to python-Linux-evdev mouse and stick. Two examples of head-tracking using opentrack and the Linux evdev library via the python evdev wrapper.
opentrack's UDP-Output protocol is used as a language neutral interface to python. Each opentrack UDP-Output packet contains 6 little-endian doubles: x, y, z, yaw, pitch, and roll.
The evdev subsystem is a generic input event interface in Linux kernel. Userspace applications can interact with evdev to create and intercept keyboard, mouse, and joystick events. Events may be raised by both real and virtual devices.
The opentrack-opal python scripts make use of the python evdev wrapper to libevdev which is in turn a wrapper for evdev devices and the kernel's evdev subsystem.
Translate opentrack UDP-output to Linux-evdev/HID mouse events.
Opentrack-mouse is easy to set up, all existing games/apps will automatically receive its mouse events. The downside is that head-tracking via a mouse is subject to drift, the tracking and the on-screen orientation drift apart (necessitating the periodic use of a re-center button).
See opentrack-mouse.md.
Translate opentrack UDP-output to Linux-evdev joystick events
emulating a Microsoft X-Box 360 pad.
Opentrack-stick provides an accurate head tracking experience, positioning is absolute, and not subject to drift. However, opntrack-stick requires the targeted game/app to support mapping joystick-axes to in-app view-changes/head-turns. The user will have to use the games key/button/axes mapping system to individually bind opentrack-axes to view-changes/head-turns.
See opentrack-stick.md.
There needs to be more research into the best settings to achieve a smooth result.
Michael Hamilton
Copyright 2022 Michael Hamilton
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