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AlterVerse: A Framework for Interactive Virtual Altering of Physical Objects in Extended Reality Environments

IEEE computer graphics AND APPLICATIONS 2024年第5期44卷 76-84页

作者： Seo, Byung-Kuk Park, Hye Sun Kim, Yong Sun Elect & Telecommun Res Inst Daejeon 34129 South Korea

This article presents AlterVerse, a framework that provides users with novel experiences through visual illusions of interactively altering physical objects in extended reality environments. In the AlterVerse framework, physical objects are seamlessly virtualized by aligning their 3-D virtual replicas with them. It enables users to manipulate (move or rotate) and reshape (deform the shapes or transform the styles of) the physical objects virtually. Simultaneously, the physical objects are visually removed from a physical environment, creating the perception that the altering occurs directly on the physical objects. As a promising application of the AlterVerse framework, the article demonstrates interactive virtual altering of home furniture in interior design or decoration scenarios without physically altering existing furniture.

关键词： Surveys Solid Modeling Telepresence Extended Reality Shape Transforms Visual Effects Search Problems rendering computer graphics Virtualization Interactive Physical Entities Virtually User Experience Object Features Digital Twin Design Scenarios Interior Design Swarm Robotics Visual Illusions Mobile Devices Image Object Color Images Graphical User Interface Human computer Interaction Control Points Generative Adversarial Networks Depth Images G Hz CPU Deformation Model Camera Pose Image Inpainting Geometric Transformation Server Side Texture Of Objects Object Geometry

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Ambient Volume Illumination

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COMPUTING IN SCIENCE & ENGINEERING 2016年第2期18卷 90-97页

作者： Ament, Marco Weiskopf, Daniel Dachsbacher, Carsten Karlsruhe Inst Technol D-76021 Karlsruhe Germany Univ Stuttgart Stuttgart Germany Karlsruhe Inst Technol Comp Sci D-76021 Karlsruhe Germany

For interactive scalar field visualization, advanced illumination effects such as ambient occlusion or ambient scattering can help perceive the spatial depth and relative size of volumetric features.

关键词： Lighting rendering computer graphics Image Color Analysis Visualization Light Sources Solid Modeling Illumination Scientific Computing Visualization Shadow Light Occlusion Scattering Illumination

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Shape Displays: Spatial Interaction with Dynamic Physical Form

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IEEE computer graphics AND APPLICATIONS 2015年第5期35卷 5-11页

作者： Leithinger, Daniel Follmer, Sean Olwal, Alex Ishii, Hiroshi MIT Media Lab Cambridge MA 02139 USA Stanford Univ Dept Mech Engn Stanford CA 94305 USA KTH Royal Inst Technol Stockholm Sweden MIT Media Lab Media Arts & Sci Cambridge MA 02139 USA MIT Media Lab Tangible Media Grp Cambridge MA 02139 USA

Shape displays are an emerging class of devices that emphasize actuation to enable rich physical interaction, complementing concepts in virtual and augmented reality. The ability to render form introduces new opportunities to touch, grasp, and manipulate dynamic physical content and tangible objects, in both nearby and remote environments. This article presents novel hardware, interaction techniques, and applications, which point to the potential for extending the ways that we traditionally interact with the physical world, empowered by digital computation.

关键词： Shape Analysis Three Dimensional Displays rendering computer graphics Data Visualization Mathematical Model Tangible Interfaces computer graphics Spatial Interfaces User Interfaces Augmented Reality Haptic Display Shape Displays Spatial Interaction

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Effectively Visualizing the Spatial Structure of Cerebral Blood Vessels

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COMPUTING IN SCIENCE & ENGINEERING 2013年第2期15卷 41-46页

作者： Luo, Yan-Lin Beijing Normal Univ Dept Comp Sci Beijing 100875 Peoples R China Chinese Acad Sci Inst Software Beijing 100864 Peoples R China

Three-dimensional visualizations of cerebral vessel structures are helpful for diagnosing diseases. However, when viewing several overlapping cerebral vessels using traditional ray casting, it's difficult to decide dear depth ordering. As a solution, distance color blending and stereoscopic depth enhancement are combined with CUDA-based pre-integrated volume rendering and its advanced transfer function for improved depth perception.

关键词： Image Color Analysis rendering computer graphics Stereo Image Processing Angiography Blood Vessels Medical Simulation Scientific Computing Transfer Functions Three Dimensional Displays Scientific Computing Cerebral Vessel Visualization Transfer Function TF Ray Casting Volume rendering Depth Cue Enhancement

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Creating Widely Accessible Spatial Interfaces Mobile VR for Managing Persistent Pain

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IEEE computer graphics AND APPLICATIONS 2013年第3期33卷 82-89页

作者： Schroeder, David Korsakov, Fedor Jolton, Joseph Keefe, Francis J. Haley, Alex Keefe, Daniel F. Univ Minnesota Interact Visualizat Lab Minneapolis MN 55455 USA Minneapolis Coll Art & Design Web & Multimedia Program Minneapolis MN USA Duke Univ Med Ctr Dept Psychiat & Behav Sci Pain Prevent & Treatment Res Program Durham NC 27706 USA Univ Minnesota Ctr Spiritual & Healing Minneapolis MN 55455 USA Univ Minnesota Dept Comp Sci & Engn Interact Visualizat Lab Minneapolis MN 55455 USA

Using widely accessible VR technologies, researchers have implemented a series of multimodal spatial interfaces and virtual environments. The results demonstrate the degree to which we can now use low-cost (for example, mobile-phone based) VR environments to create rich virtual experiences involving motion sensing, physiological inputs, stereoscopic imagery, sound, and haptic feedback. Adapting spatial interfaces to these new platforms can open up exciting application areas for VR. In this case, the application area was in-home VR therapy for patients suffering from persistent pain (for example, arthritis and cancer pain). For such therapy to be successful, a rich spatial interface and rich visual aesthetic are particularly important. So, an interdisciplinary team with expertise in technology, design, meditation, and the psychology of pain collaborated to iteratively develop and evaluate several prototype systems. The video at http://***/mMPE7itReds demonstrates how the sine wave fitting responds to walking motions, for a walking-in-place application.

关键词： Virtual Environments rendering computer graphics Spatial Intefaces Haptic Interfaces Meditation Virtual Reality VR Spatial Interfaces Pain Management computer graphics

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A Machine-Learning-Driven Sky Model

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IEEE computer graphics AND APPLICATIONS 2017年第1期37卷 80-91页

作者： Satilmis, Pinar Bashford-Rogers, Thomas Chalmers, Alan Debattista, Kurt Univ Warwick Coventry CV4 7AL W Midlands England Hacettepe Univ Ankara Turkey Univ Warwick Visualizat Coventry CV4 7AL W Midlands England

Sky illumination is responsible for much of the lighting in a virtual environment. A machine-learning-based approach can compactly represent sky illumination from both existing analytic sky models and from captured environment maps. The proposed approach can approximate the captured lighting at a significantly reduced memory cost and enable smooth transitions of sky lighting to be created from a small set of environment maps captured at discrete times of day. The author's results demonstrate accuracy close to the ground truth for both analytical and capture-based methods. The approach has a low runtime overhead, so it can be used as a generic approach for both offline and real-time applications.

关键词： Learning Artificial Intelligence Lighting rendering computer graphics Sky Brightness Machine Learning Driven Sky Model Sky Illumination Virtual Environment rendering Lighting Atmospheric Modeling Computational Modeling Illumination Neural Networks Analytical Models Virtual Environments computer graphics Sky Model Neural Network Realistic graphics Machine Learning

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COMPOSITING 3D IMAGES WITH ANTIALIASING AND VARIOUS SHADING EFFECTS

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IEEE computer graphics AND APPLICATIONS 1989年第2期9卷 21-29页

作者： NAKAMAE, E ISHIZAKI, T NISHITA, T TAKITA, S KAGAWA UNIV FAC EDUCTAKAMATSUKAGAWA 760JAPAN FUKUYAMA UNIV FAC ENGNFUKUYAMA 72902JAPAN DAIKIN IND LTD DEPT ENGN & DEVDIV ELECTRSHINJUKU KUTOKYO 163JAPAN

A method is proposed for compositing 3-D images produced by different programs, taking depth order into consideration. The method can add the following effects to composited images: antialiased images with scaling are displayed by a simple algorithm; the algorithm can add shading effects due to various types of light, such as area sources and skylight; and ray tracing can be performed in localized regions, producing realistic results without the computational expense of ray tracing the whole image. In addition to the above processes, such shading effects as fog and texture mapping can be processed with conventional methods. Thus, it becomes possible to display complex scenes with various shading effects, using relatively small computers. The multiscanning method used for antialiasing and a data structure for processing it are described. Examples are presented to demonstrate the capability of the system.<>

关键词： Data Structures computer graphics Data Structure computer graphics 3 D Images Depth Order Composited Images Antialiased Images Shading Effects Ray Tracing Fog Texture Mapping Multiscanning Method Displays Light Sources Pixel Buffer Storage rendering computer graphics Solid Modeling Surface Texture Optical Refraction Shape Ray Tracing

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Controlled topology simplification (vol 2, pg 171, 1996)

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IEEE TRANSACTIONS ON VISUALIZATION AND computer graphics 1996年第3期2卷 280-280页

作者： He, TS Dept. of Comput. Sci. State Univ. of New York Stony Brook NY USA

We present a simple, robust, and practical method for object simplification for applications where gradual elimination of high frequency details is desired. This is accomplished by converting an object into multi resolution volume rasters using a controlled filtering and sampling technique. A multiresolution triangle mesh hierarchy can then be generated by applying the Marching Cubes algorithm. We further propose an adaptive surface generation algorithm to reduce the number of triangles generated by the standard Marching Cubes. Our method simplifies the topology of objects in a controlled fashion. In addition, at each level of detail, multilayered meshes can be used for an efficient antialiased rendering.

关键词： rendering computer graphics Computational Geometry Topology Antialiasing Controlled Topology Simplification Object Simplification High Frequency Details Multi Resolution Volume Rasters Controlled Filtering Sampling Technique Multiresolution Triangle Mesh Hierarchy Marching Cubes Algorithm Adaptive Surface Generation Algorithm Standard Marching Cubes Multilayered Meshes Efficient Antialiased rendering Topology rendering computer graphics Geometry Frequency Multiresolution Analysis Sampling Methods Virtual Reality Layout Robustness

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High Visual-Quality Scenes in Low-Cost Virtual Reality With Collisions and Irregular Surfaces

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IEEE computer graphics AND APPLICATIONS 2021年第4期41卷 40-51页

作者： Nicolas Selzer, Matias Lujan Ganuza, Maria Mabel Castro, Silvia Univ Nacl Sur Inst Comp Sci & Engn VyGLab Res Lab UNS CICPBA UNS CONICETDept Comp Sci & Engn B8000 Bahia Blanca Buenos Aires Argentina Univ Nacl Sur Dept Comp Sci & Engn B8000 Bahia Blanca Buenos Aires Argentina

Mobile phones offer an excellent low-cost alternative for Virtual Reality. However, the hardware constraints of these devices restrict the displayable visual complexity of graphics. Image-based rendering techniques arise as an alternative to solve this problem, but usually, the support of collisions and irregular surfaces (i.e., any surface that is not flat or even) represents a challenge. In this work, we present a technique suitable for both virtual and real-world environments that handle collisions and irregular surfaces for an image-based rendering technique in low-cost virtual reality. We also conducted a user evaluation for finding the distance between images that presents a realistic and natural experience by maximizing the perceived virtual presence and minimizing the cybersickness effects. The results prove the benefits of our technique for both virtual and real-world environments.

关键词： computer Vision Mobile Computing Mobile Handsets Natural Scenes rendering computer graphics Virtual Reality Perceived Virtual Presence High Visual Quality Scenes Low Cost Virtual Reality Irregular Surfaces Image Based rendering Collisions Cybersickness Effect Minimization Mobile Phones Graphic Displayable Visual Complexity Realistic Experience Natural Experience Cameras Three Dimensional Displays Virtual Environments rendering computer graphics Navigation Mobile Handsets Visualization

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Adding a Solar-Radiance Function to the Hosek-Wilkie Skylight Model

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IEEE computer graphics AND APPLICATIONS 2013年第3期33卷 44-52页

作者： Hosek, Lukas Wilkie, Alexander Charles Univ Prague Prague Czech Republic

One prerequisite for realistic renderings of outdoor scenes is the proper capturing of the sky's appearance. Currently, an explicit simulation of light scattering in the atmosphere isn't computationally feasible, and won't be in the foreseeable future. Captured luminance patterns have proven their usefulness in practice but can't meet all user needs. To fill this capability gap, computer graphics technology has employed analytical models of sky-dome luminance patterns for more than two decades. For technical reasons, such models deal with only the sky dome's appearance, though, and exclude the solar disc. The widely used model proposed by Arcot Preetham and colleagues employed a separately derived analytical formula for adding a solar emitter of suitable radiant intensity. Although this yields reasonable results, the formula is derived in a manner that doesn't exactly match the conditions in their sky-dome model. But the more sophisticated a skylight model is and the more subtly it can represent different conditions, the more the solar radiance should exactly match the skylight's conditions. Toward that end, researchers propose a solar-radiance function that exactly matches a recently published high-quality analytical skylight model.

关键词： Natural Scenes Realistic Images rendering computer graphics Solar Radiation Solar Radiance Function Hosek Wilkie Skylight Model Realistic renderings Outdoor Scenes Light Scattering computer graphics Technology Analytical Models Sky Dome Luminance Patterns Solar Disc Solar Emitter Sky Dome Model High Quality Analytical Skylight Model Atmospheric Modeling Solar Radiance Rayleigh Scattering Computational Modeling Analytical Models rendering computer graphics Skylight Models Solar Radiance computer graphics

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