One critical link in VR’s value chain — besides ample content — is hand tracking. Rendering hand movements joins head and positional tracking as key steps towards realistic presence.

As we’re often reminded, the first thing many people do in first-time VR experiences is look down at their hands. When hands don’t appear, it immediately breaks presence.

This is the section of the VR development ecosystem that uSens occupies. Similar but different to Leap Motion and a few others, it develops skeletal tracking hardware and SDKs.

Building from last year’s $20 million in Series A funding, uSens’ main product is its Fingo series of sensors, including three models that each feature 26 degrees-of-freedom hand tracking.

But the biggest differentiator is modularity: the energy-efficient sensors can be attached to existing headsets, bringing inside-out 3D hand tracking to even mobile VR.

This makes it a sizable opportunity, given mobile VR’s consumer accessibility compared to tethered HMDs. And that just became truer with this week’s Daydream View improvements.

CTO & Co-founder Dr. Yue Fei hopes this modularity brings 3D hand tracking to the masses. It’s a key step in graduating from gamepads to true presence by holding tools in a natural way.

With longstanding pedigree in the field, Dr Fei explained to us recently that skeletal tracking continues to gain accessibility with the forward march of Moore’s law, mostly involving mobile CPU capacity.

One of the milestones in the science was in fact the introduction of Microsoft Kinnect. To skeletal tracking scholars, it was a proof of concept for both the science and the market.

Since then, a long series of computing advancements have enabled a standalone inside-out 3D hand tracking unit. The magic is in the CPU payload and power consumption, says Yue.

Remaining barriers include rendering, field of view and latency — all keys to improving presence and reducing nausea. And of course the holy grail is haptic feedback.

Next up for Fingo is a 6 degrees of freedom head tracking and 26 degree of freedom hand-tracking technology. Debuting at AWE, it will use a single camera module with an embedded dual-lens camera.

Yue is also interested in tackling pre-market integrations in addition to his after-market flagship. Going after these partnerships will be one use for last year’s $20M infusion.

“We want to be embedded in HMDs,” he said. “We can do the reference design and the core algorithm for making it work; they can be platform owners.”

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