Adaptic: A Shape Changing Prop with Haptic Retargeting

TL;DR

This work addresses the scalability challenge of providing realistic haptic feedback for multiple virtual objects in VR by introducing Adaptic, a shape-changing passive device that can morph to resemble different physical proxies. When combined with haptic retargeting, Adaptic can convey tactile cues for several objects at different virtual locations using a single device, with performance comparable to using multiple shape-matching props. User studies show the illusion is convincing and that shape-matching props are generally preferred for realism, though retargeting can modestly affect task speed and precision. The approach offers a cost- and space-efficient path toward versatile VR haptics, with potential applications in training, simulation, and interactive gaming, while highlighting tradeoffs between shape fidelity, retargeting, and user perception.

Abstract

We present Adaptic, a novel "hybrid" active/passive haptic device that can change shape to act as a proxy for a range of virtual objects in VR. We use Adaptic with haptic retargeting to redirect the user's hand to provide haptic feedback for several virtual objects in arm's reach using only a single prop. To evaluate the effectiveness of Adaptic with haptic retargeting, we conducted a within-subjects experiment employing a docking task to compare Adaptic to non-matching proxy objects (i.e., Styrofoam balls) and matching shape props. In our study, Adaptic sat on a desk in front of the user and changed shapes between grasps, to provide matching tactile feedback for various virtual objects placed in different virtual locations. Results indicate that the illusion was convincing: users felt they were manipulating several virtual objects in different virtual locations with a single Adaptic device. Docking performance (completion time and accuracy) with Adaptic was comparable to props without haptic retargeting.

Figures (9)

• Figure 1: Adaptic hardware configuration layout.
• Figure 2: Razer Hydra used for tracking props
• Figure 3: Participant view during the task.
• Figure 4: User perception of the task with the right object.
• Figure 5: Participants performing the docking task.