Publications related to Virtual fixture

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This paper presents a validation study of a real-time shotcrete simulation model based on a physics-informed particle system. The model emulates concrete spray dynamics by replaying empirically recorded nozzle trajectories from expert and novice operators in a controlled virtual environment. We evaluate its ability to capture skill-related differences in key sprayability metrics, including material adhesion, rebound, and cohesive failure. The results reveal statistically significant distinctions between exp

We show how a variety of techniques from Computer Graphics can be leveraged to intuitively control the shape (configuration) of arbitrary 3D Soft Robots in VR. Our pipeline, Virtual Reality Soft Robot Inverse Kinematics (VR-Soft IK), overcomes fundamental limitations of general-purpose drag-and-drop soft robot control interfaces by leaving the 2D computer screen for 3D Virtual Reality (VR). VR-Soft IK uses a simulation based on the Finite Element Method (FEM) and a control method based on sensitivity analys

To address the current gap in view-out research, this study aims to develop a workflow able to accurately capture dynamic views in an experimental setting. In testing the suitability of the proposed methodology, we conducted two comparative studies on the participants’ perceptual impressions using VR. In the first experiment, participants (N=34) were asked to observe window views in two different conditions - one from a real office and the other projected in VR, which was recorded from the same office space

Episodic memories (EMs) are recollections of contextually rich and personally relevant past events. EM has been linked to the sense of self, allowing one to mentally travel back in subjective time and re-experience past events. However, the sense of self h ...

Competition changes the environment for athletes. The difficulty of training for such stressful events can lead to the well-known effect of “choking” under pressure, which prevents athletes from performing at their best level. To study the effect of compet ...

Performing remote manipulation tasks by teleoperation with limited bandwidth, communication delays and environmental differences is a challenging problem. In this paper, we learn a task-parameterized generative model from the teleoperator demonstrations using a \textit{hidden semi-Markov model} that provides assistance in performing remote manipulation tasks. We present a probabilistic formulation to capture the intention of the teleoperator, and subsequently assist the teleoperator by time-independent shar

Face recognition is a highly specialized capability that has implicit and explicit memory components. Studies show that learning tasks with facial components are dependent on rapid eye movement and non-rapid eye movement sleep features, including rapid eye ...

A fast computational framework is devised to the study of several configurations of patient-specific coronary artery bypass grafts. This is especially useful to perform a sensitivity analysis of the hemodynamics for different flow conditions occurring in n ...

This contribution focuses on perforated façades, investigating the effect of the façade and the resulting daylight pattern on the perceived spatial ambiance. The daylight conditions, as well as the geometry and regularity of the façade pattern are manipulated in an immersive virtual space, producing different conditions. A preliminary study was conducted, where subjective evaluations of the virtual space were recorded across six variations of façade pattern and sky type. The results indicate that the façade

A fast computational framework is devised to the study of several configurations of patient-specific coronary artery by-pass grafts. This is especially useful to perform a sensitivity analysis of the haemodynamics for different flow conditions occurring in native coronary arteries and bypass grafts, the investigation of the progression of the coronary artery disease and the choice of the most appropriate surgical procedure. A complete pipeline, from the acquisition of patient-specific medical images to fast

After continuously applying spatially and temporally congruent visuo-tactile stimulation to external, body-like objects, healthy humans feel the fake part to be the origin of the touch sensations and feel it to be their own. Incongruent stimulation nullifies both illusory changes. This Rubber Hand Illusion (RHI) is the most used paradigm to experimentally investigate healthy humans’ bodily self-consciousness and the extension of body ownership to foreign objects [1]. Standard RHI setups are limited by physi

After implementing a motivational model of action selection applied to autonomous virtual humans inspired by models of animals' decision-making, the problem consists of testing it in good conditions for validation. Indeed this model has to respect the six criteria that we define according to Tyrell's requirements for designing a mechanism of action selection. So we use the real-time framework VHD++ for advanced virtual human simulation and we define a simulated environment with many conflicting motivations.

This paper discusses the main issues for creating interactive virtual environments with virtual humans emphasizing the following aspects: creation of virtual humans, gestures, interaction with objects, multimodal communication

The new breed of Personal Digital Assistants (PDA) and mobile phones have enough computing power to display 3D graphics. These new mobile devices (handhelds) have some other interesting communication and interaction possibilities as well. In this paper we explore the potential applications of 3D virtual humans inside mobile devices and the use of such handhelds as control interfaces to drive the virtual humans and navigate through their virtual environments.

The tutorial will explain the techniques for integrating virtual humans into virtual and real environments. It will first present the concept of avatars and autonomous virtual actors and the main techniques to create and animate them (body and face). It will present the concepts of behavioral animation, crowd simulation, intercommunication between virtual humans, and interaction between real humans and autonomous virtual humans. The tutorial will also address the advanced topics of real-time cloth animation

We present an augmented reality system that relies on purely passive techniques to solve the real-time registration problem. It can run on a portable PC and does not require engineering of the environment, for example by adding markers. To achieve this result, we have integrated robust computer vision techniques into a powerful VR framework. The resulting AR system allows us to produce complex rendering and animation of virtual human characters, and to blend them into the real world. The system tracks the 3

Our research focuses on the behavioral animation of virtual humans who are capable of taking actions by themselves. We deal more specifically with reinforcement learning methodologies, which integrate in an original way the RL agent and the autonomous virtual agent in a virtual environment. With the help of a virtual environment in the form of a town, we demonstrate that it is indeed the learning process and not the optimization of RL, which is used by the AVAs

In the past decade, networked virtual environments (NVEs) have been an increasingly active area of research, with the first commercial systems emerging recently. Graphical and behavioral representation of users within such systems is a particularly important issue that has lagged in development behind other issues such as network architectures and space structuring. We expose the importance of using virtual humans within these systems and provide a brief overview of several virtual human technologies used i

In combination with the rapid technical improvements of computers, building large virtual scenes has become a popular field in computer graphics for education, films or games. Often, virtual humans populate scenes such as real reconstructed city, disappeared building or virtual town, and they are expected to provide a real life feeling. The specific aim of this thesis is to perform action planning in order to populate these scenes with virtual humans. To achieve this goal, we use a database dedicated to urb

We present a networked virtual environment (NVE) system and an attraction building system based on Windows NT that enables users to introduce their own scenario-based applications into a shared virtual environment. Our goal was to develop and integrate several modules into a system capable of animating realistic virtual humans in a real-time performance. This includes modeling and representing virtual humans with high realism and simulating human face and body movements in real time. Realism becomes quite i

Virtual fixture

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From Human to Height-Field: Predictive Shotcrete Simulation with a Physics-Informed Particle System

A Soft Robot Inverse Kinematics for Virtual Reality

A New Representation Framework for View-Out Research

First-person view of one’s body in immersive virtual reality: Influence on episodic memory

Novice Shooters With Lower Pre-shooting Alpha Power Have Better Performance During Competition in a Virtual Reality Scenario

A Generative Model for Intention Recognition and Manipulation Assistance in Teleoperation

Sleep-dependent consolidation of face recognition and its relationship to REM sleep duration, REM density and Stage 2 sleep spindles

Numerical modeling of hemodynamics scenarios of patient-specific coronary artery bypass grafts

Daylight patterns as a means to influence the spatial ambiance: a preliminary study

MATHICSE Technical Report : A fast virtual surgery platform for many scenarios haemo-dynamics of patient-specific coronary artery bypass grafts

Fully automated modulation of virtual-body ownership supresses fronto-parietal mu rhythm

The complexity of testing a motivational model of action selection for virtual humans

The virtual human as a multimodal interface

Controlling Virtual Humans Using PDAs

Virtual humans for virtual reality and augmented reality

Stable Real-Time Interaction Between Virtual Humans and Real Scenes

Behavioral animation of autonomous virtual agents helped by reinforcement learning

Simulating virtual humans in networked virtual environments

An informed environment for inhabited city simulation

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