Workshop on Virtual Reality Interactions and Physical Simulations最新文献_第10页

Accurate Contact Modeling for Multi-rate Single-point Haptic Rendering of Static and Deformable Environments 静态和可变形环境的多速率单点触觉渲染的精确接触建模

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/vriphys.20151336

T. Knott, T. Kuhlen

{"title":"Accurate Contact Modeling for Multi-rate Single-point Haptic Rendering of Static and Deformable Environments","authors":"T. Knott, T. Kuhlen","doi":"10.2312/vriphys.20151336","DOIUrl":"https://doi.org/10.2312/vriphys.20151336","url":null,"abstract":"Common approaches for the haptic rendering of complex scenarios employ multi-rate simulation schemes. Here, the collision queries or the simulation of a complex deformable object are often performed asynchronously on a lower frequency, while some kind of intermediate contact representation is used to simulate interactions on the haptic rate. However, this can produce artifacts in the haptic rendering when the contact situation quickly changes and the intermediate representation is not able to reflect the changes due to the lower update rate. We address this problem utilizing a novel contact model. It facilitates the creation of contact representations that are accurate for a large range of motions and multiple simulation time-steps. We handle problematic convex contact regions using a local convex decomposition and special constraints for convex areas. We combine our accurate contact model with an implicit temporal integration scheme to create an intermediate mechanical contact representation, which reflects the dynamic behavior of the simulated objects. Moreover, we propose a new iterative solving scheme for the involved constrained dynamics problems. We increase the robustness of our method using techniques from trust region-based optimization. Our approach can be combined with standard methods for the modeling of deformable objects or constraint-based approaches for the modeling of, for instance, friction or joints. We demonstrate its benefits with respect to the simulation accuracy and the quality of the rendered haptic forces in multiple scenarios.","PeriodicalId":446363,"journal":{"name":"Workshop on Virtual Reality Interactions and Physical Simulations","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132779701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Grid-Free Surface Tracking on the GPU GPU上的无网格表面跟踪

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/vriphys.20151338

N. Chentanez, Matthias Müller, M. Macklin, Tae-Yong Kim

引用次数: 1

Interactive Simulation of a Continuum Mechanics based Torsional Thread 基于连续介质力学的扭螺纹交互仿真

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/PE/vriphys/vriphys10/049-058

K. Larsson, G. Wallgren, M. Larson

引用次数: 2

OCTAVIS: An Easy-to-Use VR-System for Clinical Studies OCTAVIS:一个易于使用的临床研究vr系统

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/PE/vriphys/vriphys12/127-136

J. Bender, Arjan Kuijper, D. W. Fellner, É. Guérin, Eugen Dyck, E. Zell, Agnes Kohsik, P. Grewe, York Winter, M. Piefke, Mario Botsch

引用次数: 7

MLS Pressure Extrapolation for the Boundary Handling in Divergence-Free SPH 无散度SPH边界处理的MLS压力外推

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/vriphys.20181068

Stefan Band, Christoph Gissler, A. Peer, M. Teschner

{"title":"MLS Pressure Extrapolation for the Boundary Handling in Divergence-Free SPH","authors":"Stefan Band, Christoph Gissler, A. Peer, M. Teschner","doi":"10.2312/vriphys.20181068","DOIUrl":"https://doi.org/10.2312/vriphys.20181068","url":null,"abstract":"We propose a novel method to predict pressure values at boundary particles in incompressible divergence-free SPH simulations (DFSPH). Our approach employs Moving Least Squares (MLS) to predict the pressure at boundary particles. Therefore, MLS computes hyperplanes that approximate the pressure field at the interface between fluid and boundary particles. We compare this approach with two previous techniques. One previous technique mirrors the pressure from fluid to boundary particles. The other one extrapolates the pressure from fluid to boundary particles, but uses a gradient that is computed with Smoothed Particle Hydrodynamics (SPH). We motivate that gradient-based extrapolation is more accurate than mirroring. We further motivate that our proposed MLS gradient is less error prone than the SPH gradient at the boundary. In our experiments, we indicate artifacts in previous approaches. We show that these artifacts are significantly reduced with our approach resulting in simulation steps that can be twice as large compared to previous methods. We further present challenging and complex scenarios to illustrate the capabilities of the proposed boundary handling. CCS Concepts •Computing methodologies → Physical simulation; Massively parallel and high-performance simulations;","PeriodicalId":446363,"journal":{"name":"Workshop on Virtual Reality Interactions and Physical Simulations","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129443705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Physics-based Human Neck Simulation 基于物理的人体颈部模拟

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/PE.vriphys.vriphys13.051-060

Zhiping Luo, N. Pronost, A. Egges

引用次数: 0

Virtual Fitting Pipeline: Body Dimension Recognition, Cloth Modeling, and On-Body Simulation 虚拟装配管道:身体尺寸识别，布料建模和身体仿真

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/vriphys.20141228

Dirk Siegmund, Timotheos Samartzidis, N. Damer, A. Nouak, C. Busch

{"title":"Virtual Fitting Pipeline: Body Dimension Recognition, Cloth Modeling, and On-Body Simulation","authors":"Dirk Siegmund, Timotheos Samartzidis, N. Damer, A. Nouak, C. Busch","doi":"10.2312/vriphys.20141228","DOIUrl":"https://doi.org/10.2312/vriphys.20141228","url":null,"abstract":"This paper describes a solution for 3D clothes simulation on human avatars. The proposed approach consists of three parts, the collection of anthropometric human body dimensions, cloths scanning, and the simulation on 3D avatars. The simulation and human machine interaction has been designed for application in a passive InShop advertisement system. All parts have been evaluated and adapted under the aim of developing a low-cost automated scanning and post-production system. Human body dimension recognition was achieved by using a landmark detection based approach using both two 2D and 3D cameras for front and profile images. The human silhouettes extraction solution based on 2D images is expected to be more robust to multi-textured background surfaces than existing solutions. Eight measurements corresponding to the norm of body dimensions defined in the standard EN-13402 were used to reconstruct a 3D model of the human body. The performance is evaluated against the ground-truth of our newly acquired database. For 3D scanning of clothes, different scanning methods have been evaluated under apparel, quality and cost aspects. The chosen approach uses state of the art consumer products and describes how they can be combined to develop an automated system. The scanned cloths can be later simulated on the human avatars, which are created based on estimation of human body dimensions. This work concludes with software design suggestions for a consumer oriented solution such as a virtual fitting room using body metrics. A number of future challenges and an outlook for possible solutions are also discussed.","PeriodicalId":446363,"journal":{"name":"Workshop on Virtual Reality Interactions and Physical Simulations","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117060708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Interactive Inverse Kinematics for Human Motion Estimation 交互式逆运动学人体运动估计

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/PE/vriphys/vriphys09/077-084

Morten Engell-Nørregård, Søren Hauberg, Jérôe Lapuyade, Kenny Erleben, K. S. Pedersen

引用次数: 1

See-through Visualisation for Training and Assessing Unsighted Physical Examinations 用于训练和评估视力不佳的身体检查的透视可视化

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/vriphys.20171087

Alejandro Granados, J. Perháč, L. Rosby, Yee Mun Lee, G. Tan, T. C. Tan, J. Higham, N. Magnenat-Thalmann, N. Low-Beer, F. Bello

{"title":"See-through Visualisation for Training and Assessing Unsighted Physical Examinations","authors":"Alejandro Granados, J. Perháč, L. Rosby, Yee Mun Lee, G. Tan, T. C. Tan, J. Higham, N. Magnenat-Thalmann, N. Low-Beer, F. Bello","doi":"10.2312/vriphys.20171087","DOIUrl":"https://doi.org/10.2312/vriphys.20171087","url":null,"abstract":"Objective: Motivated by the limitations of being unable to provide feedback and adequately assess technical skills whilst training unsighted physical examinations, such as Digital Rectal Examinations (DRE), we present a see-through visualisation system that can be used with benchtop models widely available in medical schools. Methods: We use position and pressure sensors located on the examining finger and have implemented a Virtual Reality (VR) simulation learning tool consisting of registered 3D models of the benchtop, augmented with relevant surrounding pelvic anatomy. The proposed system was evaluated with six medical students and eleven consultants. Results: The system is stable, runs in real time, uses unobtrusive sensor coils and pads, is able to capture data from sensors at 40Hz and adequately translates and rotates the position of the examining finger aligned to the 3D models of the benchtop and surrounding anatomy. Both medical students and consultants recognised the educational value of being able to see-through and visualise surrounding relevant anatomy. Although novices are reported to be the group that could benefit the most from our system, it is crucial not to be over reliant on visual cues for too long and to develop a strategy for the adequate use of the see-through system. Conclusions: The proposed VR simulation system is intended to improve the experience of novices learning unsighted examinations by providing real-time feedback and visualisation, allowing trainees to reflect on their performance and permitting more adequate assessment of technical skills.","PeriodicalId":446363,"journal":{"name":"Workshop on Virtual Reality Interactions and Physical Simulations","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124297874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

3D Sketch Recognition for Interaction in Virtual Environments 面向虚拟环境交互的三维草图识别

Workshop on Virtual Reality Interactions and Physical Simulations Pub Date : 1900-01-01 DOI: 10.2312/PE/vriphys/vriphys10/115-124

Dominik Rausch, I. Assenmacher, T. Kuhlen

引用次数: 8