Cheap full-body VR tracking without base station for SteamVR and motion capture launches

A new system promising accurate, almost full-body motion tracking is now available for pre-order. The SlimeVR Butterfly Trackers, developed as part of an ongoing Crowd Supply campaign, aim to provide a relatively inexpensive solution for capturing movement in virtual reality and beyond.

Expanding the Scope of Motion Tracking

Currently, tracking hand movements is standard in VR for greater immersion. More specialized systems can also track fingers and feet. The SlimeVR Butterfly Trackers seek to expand this capability, offering the potential for full-body tracking with multiple units and the ability to detect subtle movements of individual body parts.

Diverse Applications

The potential applications for this technology are broad. VTubers could utilize the trackers to control their avatars, while VR gamers could benefit from more immersive experiences. Beyond entertainment, the system could be used for motion capture, scientific analysis, and even the motion analysis of athletes.

Did You Know? The trackers weigh less than 0.35 oz and are thinner than 0.28 inches.

How the System Works

The system consists of individual trackers attached to different parts of the body via straps. These trackers utilize IMU sensors to detect movement, transmitting data over distances exceeding 33 ft to a computer, smartphone, or headset. The SlimeVR server then combines the data from these sensors.

Key Features and Specifications

Notably, the system does not require external base stations or cameras. The company claims 360-degree coverage, as the sensors capture data independently of line of sight. Latency is listed as under 15 ms, with a precision of 0.39 to 1.97 inches. Battery life is reported to be more than 48 hours.

Expert Insight: The elimination of external base stations and cameras represents a significant advantage in terms of setup simplicity and portability, potentially lowering the barrier to entry for users interested in full-body motion tracking.

Availability and Considerations

The SlimeVR Butterfly Trackers offer native support for SteamVR, OSC, and VMC. Motion capture in Blender and Unity is also reportedly straightforward with corresponding plugins. Backers can currently reserve a bundle of six trackers for $279 through the Crowd Supply campaign; however, standard crowdfunding risks apply.

Frequently Asked Questions

What types of movements can the trackers detect?

The trackers are designed to capture full-body movement and subtle motions, including movement of individual body parts, though very subtle motions such as trembling may not be detectable.

What devices are compatible with the trackers?

The system is compatible with computers, smartphones, and headsets, and offers native support for SteamVR, OSC, and VMC. It also works with Blender and Unity.

How is data transmitted from the trackers?

Data is transmitted over distances of more than 33 ft using IMU sensors, and is combined by the SlimeVR server.

As the SlimeVR Butterfly Trackers move closer to production, how might this technology influence the development of more immersive and interactive digital experiences?