Meta's recent v60 update for Quest devices introduces two cutting-edge features in VR body tracking: Inside-Out Body Tracking (IOBT) and Generative Legs. These tools enable developers to create more realistic, immersive virtual reality experiences, enhancing upper and lower body motion tracking to benefit gaming, fitness, and social applications alike. Here’s a closer look at what each feature offers and how they work.

IOBT is exclusive to the Meta Quest 3 and leverages the device’s built-in cameras to track upper body movements with high precision. Using this system, a user’s elbow, wrist, and torso movements can now be accurately mapped, enhancing the sense of immersion for VR applications where full-body engagement is essential.

For example, IOBT is especially valuable in fitness or combat-based apps, where body precision matters. Whether users are dodging objects, throwing punches, or performing exercises, their movements are reflected more naturally in the virtual space. This level of accuracy helps maintain correct posture in fitness apps and adds realism in action games.

Generative Legs addresses a common limitation in VR—many avatars previously only displayed the upper body, giving a “floating torso” effect that could feel less immersive in social or interactive VR settings. Generative Legs solves this by using AI to predict realistic leg movements based solely on the position of the upper body, making it possible to simulate a full-body avatar without additional sensors or hardware.

This feature is compatible with all Meta Quest devices, meaning developers can incorporate leg movements into their VR experiences across the board. Whether in social apps or gaming environments, avatars now move with more lifelike, natural leg motions, enhancing the sense of presence for users.

With the release of these new capabilities, the Movement SDK now provides easy access to full-body motion capture without requiring a studio setup. Both IOBT and Generative Legs can be seamlessly integrated with Unity and Unreal Engine, which makes it easier for developers to implement full-body motion tracking in VR applications.

In addition, developers working with skeletal or facial tracking will benefit from Movement SDK’s compatibility with popular VR tools, such as Unreal Metahuman and Unity Mecanim characters. This allows for smooth motion and facial expression tracking, making VR characters feel more authentic. For those using Unreal’s Live Link, these new features integrate well, further simplifying VR production workflows.

One example of how these tools bring experiences to life is Dodge Arcade, an app available on App Lab, which demonstrates the enhanced tracking fidelity of IOBT in Meta Quest 3. In this game, players dodge fireballs and block soccer balls, where each movement—squatting, leaning, jumping—directly corresponds to actions on the screen, both in the character’s movement and in the overhead replays. It’s an exciting showcase of the potential for accurate, reactive gameplay in VR.

The combined tracking capabilities of IOBT and Generative Legs help make VR interactions, such as standing, walking, and conversing, feel much more realistic. For example, users can now move to a whiteboard, circle a table, or step closer to another person in VR with natural body movement. The enhanced realism brought by these tools has great potential to improve social presence in VR, where authentic, responsive movements can deepen user engagement and immersion.

Developers can access the IOBT and Generative Legs features within the XR Core package, alongside other body-tracking resources, through the Movement SDK documentation. Sample projects for Unreal and Unity provide hands-on examples, helping developers quickly integrate and experiment with these tools.

For those interested in creating lifelike avatars and full-body movements in VR, these new features open up exciting possibilities for more engaging, realistic applications across various VR experiences. IOBT and Generative Legs represent a big step toward creating VR worlds that feel increasingly tangible, making virtual presence more natural than ever.