Virtual reality

Studying Pseudo-Stiffness Perceptual Thresholds in a VR Grasping Task To appear in 2023! Pseudo-Haptic techniques, or visuo-haptic illusions, leverage user’s visual dominance over haptics to alter the users’ perception. As they create a discrepancy between virtual and physical interactions, these illusions are limited to a perceptual threshold. Many haptic properties have been studied using pseudo-haptic techniques, such as weight, shape or size. In this paper, we focus on estimating the perceptual thresholds for pseudo-stiffness in a virtual reality grasping task.…

Haptic exoskeleton gloves are a widespread solution for providing force-feedback in Virtual Reality (VR), especially for 3Dobject manipulations. However, they are still lacking an important feature regarding in-hand haptic sensations: the palmar contact. In this paper, we present PalmEx, a novel approach which incorporates palmar force-feedback into exoskeleton gloves to improve the overall grasping sensations and manual haptic interactions in VR. PalmEx’s concept is demonstrated through a self-contained hardware system augmenting a hand exoskeleton with an encountered palmar contact interface…

We present a novel computational model to favour bare-hands interactions with haptic technologies in Virtual Realityenvironments. Using grasp taxonomies defined in the literature, we broke down users’ gestures into four key geometrical features and developed a model which dynamically predicts the users future within-object grasp intentions locations. The model supports a wide range of grasps including precision and power grasps, pulling or pushing as well as two-handed interactions. Moreover, its implementation does not require calibration (no parameter, user-independent) nor specific…

Understanding and Mitigating Encountered-Type of Haptic Devices Failure Modes in VR Encountered-type of Haptic devices (ETHD) are robotic interfaces physically overlaying virtual counterparts prior to a user interaction in Virtual Reality. They theoretically reliably provide haptics in Virtual environments, yet they raise several intrinsic design challenges to properly display rich haptic feedback and interactions in VR applications. In this paper, we use a Failure Mode and Effects Analysis (FMEA) approach to identify, organise and analyse the failure modes and their…

Survey of Virtual Reality Interactions via Haptic Solutions In the past few years, the terms “Virtual Reality” and “Haptics” have been amongst the most quoted keywords in HCI conferences. Why enabling haptics in VR? Virtual Reality experiences are evaluated in terms of presence. Presence is the feeling of being in another place than the one we are actually in. It heavily relies on the users’ senses. Currently, immersion and realism levels in terms of vision and auditory cues are really…

A Large-Scale Force-Feedback Robotic Interface for Non-Deterministic Scenarios in VR CoVR is a physical column mounted on a 2D Cartesian ceiling robot to provide strong kinesthetic feedback (over 100N) in a room-scale VR arena. The column panels are interchangeable and its movements can safely reach any location in the VR arena thanks to XY displacements and trajectory generations avoiding collisions with the user. When CoVR is static, it can resist to body-scaled users’ actions, such as (A) users pushing on…