Relativty: An open-source VR headset for $200
An open‑source project promises a DIY VR headset for about $200 in parts, sparking interest from hobbyists who value tinkering and customization over buying closed commercial devices. Commenters question its technical tradeoffs—particularly its reliance on 3DoF tracking without controllers, which many see as inadequate for modern, comfortable VR compared with affordable 6DoF headsets like the Meta Quest line. Broader themes include whether future VR hardware will replace monitors, how much users should value their own build time and tooling costs, and concerns around privacy and mandatory online accounts in mainstream headsets.
Product name, branding, and searchability
- Many find “Relativty” (missing an “i”) confusing, hard to spell, and worse for discoverability due to autocorrect.
- Some argue a clearer name like “RelativityVR” would better communicate purpose and be easier to communicate, especially for non‑native speakers.
- The domain choice and later rebranding toward “Unai”/unison.co are noted and questioned.
DIY nature, real cost, and hobby value
- Key point: it’s not a $200 retail headset; it’s a DIY build using ~$200 in parts, plus 3D printing and soldering.
- Several comments stress hidden costs: tools, printer, consumables, failed prints, missing small parts, lack of warranty.
- Others counter that for hobbyists the build process is the point, and “time cost” is outweighed by fun, learning, and customization.
3DoF vs 6DoF tracking debate
- Many argue 3DoF (rotation only) is now inadequate for “real VR”; 6DoF is seen as minimum for comfort, immersion, and avoiding motion sickness, even when seated.
- Some say 3DoF is acceptable for limited use cases: movies, simple sit‑down experiences, or as a head‑mounted display.
- Lack of tracked controllers is repeatedly cited as a major limitation, making it closer to a movie viewer than a modern VR system.
- A related open‑source project (HadesVR) is mentioned as a 6DoF evolution derived from this work.
Tracking technology and technical constraints
- Multiple explanations describe why IMU‑only (accelerometers/gyros) positional tracking fails: rapid drift, error accumulation, and need for external references.
- Modern 6DoF systems fuse IMUs with multiple cameras and SLAM; phones’ rolling shutters and power budgets make robust mobile tracking hard.
- Extra sensors like magnetometers, GPS, or LiDAR help in other domains but generally don’t achieve required indoor, millimeter‑level accuracy alone.
Comparisons to commercial headsets and use cases
- Some argue a $300 Meta Quest 3S or used 6DoF headsets are better value for general users.
- Others are specifically interested in:
- A lightweight, high‑resolution head‑mounted display for movies or FPV drone flying.
- Future “monitor replacement” scenarios or programming in VR/AR.
- Privacy and mandatory account concerns around commercial headsets, especially Meta, are raised and disputed.
Ecosystem, future, and reception
- The project is praised as a learning platform and classroom/club project.
- Skeptics doubt traction without 6DoF and controllers, but enthusiasts see strong maker appeal and view it as a stepping stone toward more open VR hardware.