Haptic PIVOT
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Haptic PIVOT is a wrist-mounted haptic research prototype for virtual reality. A motor swings a handle into the user's palm when a virtual object is acquired, then retracts it when released. The work was presented at UIST 2020 by Robert Kovacs, Eyal Ofek, Mar Gonzalez-Franco, Alexa Fay Siu, Sebastian Marwecki, Christian Holz and Mike Sinclair.[1]
Mechanism and interaction
The handle contains capacitive touch sensors, a trigger and a voice-coil actuator for vibration. A motorized hinge deploys it; a separate passive hinge accommodates sideways wrist movement. Tilting the deployment axis helps the handle clear the thumb. An accelerometer also detects gestures for summoning or dismissing the handle. Retraction leaves the palm available for physical tasks such as keyboard and mouse use.[2]
For approaching objects, deployment begins with a preparation position within 30 cm, followed by movement toward the palm within 10 cm. Touch sensing links physical grasp and release to their virtual counterparts. The apple demonstration combines resistance while pulling a branch, a vibration when detaching the fruit and pressure representing its weight.[2]
Force feedback is limited to the component perpendicular to the palm. A force parallel to the palm produces no corresponding force sensation. Two devices can provide coordinated forces, but cannot physically constrain the hands together.[3]
Prototype measurements
The paper reports the following apparatus measurements.[3]
| Measurement | Reported value |
|---|---|
| Device mass, including battery | 188 g |
| Additional Vive Tracker mass | 89 g |
| Force at the 120 mm handle lever's end, full motor power | 3.5 N |
Microsoft's description reports USB polling below 1 ms. This describes communication, rather than a complete mechanical response. The handle's full movement takes about 340 ms, a distinction emphasized in later analysis of on-demand actuators.[2][4]
User study
Twelve participants completed grasping, catching/throwing and weight-comparison tasks. Grasp realism depended on the virtual object's similarity to the fixed handle. Catching trials reached 25 m/s, but software snapped balls to the hand to accommodate latency; these were not unassisted catching-accuracy tests. In weight comparisons, participants identified the heaviest ball correctly in 83% of cases and the lightest in 91%.[3]
The authors report possible arm numbness after wear exceeding an hour and missed palm contact at extreme wrist rotations. These observations limit generalizations about comfort or unrestricted hand movement.[3]
Research context
A CHI 2026 perspective discusses PIVOT as an example of an on-demand actuator: the contact mechanism moves to the skin for virtual feedback and withdraws for physical interaction. This category addresses a problem that evaluating virtual touch alone can miss. A wearable device may produce convincing simulated contact while obstructing the skin needed to feel tools, keyboards or other physical objects.[4]
That analysis treats retraction as a tradeoff. The mechanism still occupies space elsewhere on the body, its geometry limits where it can reach, and moving between positions introduces delay. The paper distinguishes this design strategy from devices that transmit sensations through thin material or stimulate other body locations. Its discussion places PIVOT within research on switching between virtual and physical interaction, rather than establishing application-wide effectiveness.[4]
References
- ↑ "Haptic PIVOT: On-Demand Handhelds in VR". Microsoft Research. 2020-10. https://www.microsoft.com/en-us/research/publication/haptic-pivot-on-demand-handhelds-in-vr/. Retrieved 2026-10-21.
- ↑ 2.0 2.1 2.2 "Physics matters: Haptic PIVOT, an on-demand controller, simulates physical forces such as momentum and gravity". Microsoft Research. 2020-10-20. https://www.microsoft.com/en-us/research/blog/physics-matters-haptic-pivot-an-on-demand-controller-simulates-physical-forces-such-as-momentum-and-gravity/. Retrieved 2026-10-21.
- ↑ 3.0 3.1 3.2 3.3 "Haptic PIVOT: On-Demand Handhelds in VR". Proceedings of the 33rd Annual ACM Symposium on User Interface Software and Technology. 2020-10. https://static.siplab.org/papers/uist2020-haptic_pivot.pdf. Retrieved 2026-10-21.
- ↑ 4.0 4.1 4.2 "Next Generation Wearable Haptics Should Balance Virtual & Real-world Fidelity". Proceedings of the 2026 CHI Conference on Human Factors in Computing Systems. 2026-04. https://tengshanyuan.info/projects/teng-haptics-chi26.pdf. Retrieved 2026-10-21.