Grabity: A Wearable Haptic Interface for Simulating Weight and Grasping in Virtual Reality
summary
Grabity is a wearable fingertip device mounted on thumb and index that uses a unidirectional brake for rigid pinch force and two voice coil asymmetric vibration actuators passively aligned by a revolute joint to simulate gravity. Hardware is 65 g, 30–100 mm pinch range, OptiTrack + Oculus for tracking. User studies show controllable virtual forces up to 15 g downward and 8 g upward, but perception varies widely, vibration interferes, and weight sorting hits ~60% accuracy with medium/heavy confusion.
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chapters (9)
- 0:00Introduction to Grabity
- 1:12Ungrounded haptics for VR
- 2:59Goal of simulating weight
- 4:51Device design overview
- 7:49Asymmetric vibration for weight
- 9:01Measuring virtual force strength
- 12:27Weight sorting task results
- 14:15Limitations and future work
- 15:22Conclusion and Q&A
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