A novel approach to structureddesign of complex interactive virtual reality applications. called Flex-VR, is presented. Two main elements of the approach are: first, componentization of VR content, which enables to d...
详细信息
ISBN:
(纸本)9781605582139
A novel approach to structureddesign of complex interactive virtual reality applications. called Flex-VR, is presented. Two main elements of the approach are: first, componentization of VR content, which enables to dynamically compose interactive behavior-rich virtual scenes from independent components, and second, a high-level VR content model, which enables users to easily create and manipulate complex VR application content.
this paper presents an open standard andweb-based framework that generates HLA-compliant simulation visualization interfaces with support to control and management functionalities. differently from other existing app...
详细信息
ISBN:
(纸本)9781605582139
this paper presents an open standard andweb-based framework that generates HLA-compliant simulation visualization interfaces with support to control and management functionalities. differently from other existing approaches, our framework can provide greater flexibility for customization anddeployment of 3d-visualizations of HLA-based simulations using current available implementations of X3d in different devices, from palmtops to desktops.
design patterns capture reusable solutions to common problems, and have been used as all approach to simplifying the development and maintenance of software systems. this paper extracts several design patterns from th...
详细信息
ISBN:
(纸本)9781605582139
design patterns capture reusable solutions to common problems, and have been used as all approach to simplifying the development and maintenance of software systems. this paper extracts several design patterns from the implementations of recent Popular 3d Visualization toolkits. While these toolkits follow the same X3d standard, their respective realizations of this standarddiffer to an extent. the use of these design patterns leads to better modularity, making the resulting code base easier to maintain and extend. therefore, our initial catalog of 3d Visualization design patterns call guide the designers of future toolkits in their quest to create more maintainable and extensible software.
3d Portal application is a multi-user Virtual Environment that creates its content from distributed3d components. the users can explore the shared virtual space and interact withthe virtual objects contributed from ...
详细信息
ISBN:
(纸本)9781605582139
3d Portal application is a multi-user Virtual Environment that creates its content from distributed3d components. the users can explore the shared virtual space and interact withthe virtual objects contributed from various providers. Service Oriented Architecture (SOA) is often used for the distributedweb applications as well as some real-time distributed simulations. SOA has its advantages in service integration anddata interoperation based on the underlying web services technology. However, the request-response communication style of the service invocation sets up a real-time performance barrier for the distributed3d applications using SOA. We introduce a framework for real-time 3d portal applications using SOA. the proposed framework introduces additional streaming channels in the scene aggregation and uses profiles to coordinate the application integration. Both MPEG-4 and X3d are used as the standards for the 3d content delivery and presentation. We discuss the performance challenges based on the experiment results from a pilot study. Considering the performance impact of SOA, We suggest a set of applications that fit the proposed framework.
Models of 3d objects have become widely accessible in several disciplines within academia and industry, spanning from scientific visualization to entertainment. In the last few years, 3d models are often organized int...
详细信息
ISBN:
(纸本)9781605582139
Models of 3d objects have become widely accessible in several disciplines within academia and industry, spanning from scientific visualization to entertainment. In the last few years, 3d models are often organized into digital libraries accessible over the network, andthus semantic annotation of such models becomes an important issue. A fundamental step in annotating a 3d model is to segment it into meaningful parts. In this work, we present a Java3d framework for inspecting and segmenting 3d objects represented in X3d format. In particular, we present a combination of segmentation and merging techniques for producing a feasible decomposition of the boundary of a 3d Object. We represent such decomposition as a graph, that we call the segmentation graph which is the basis for semantic annotation. We describe also the interface we have developed to allow visualization and browsing of boththe decomposition andthe segmentation graph in order to understandthe topological structure of the resulting decomposition.
Streaming data to efficiently render complex 3d scenes in presence of global illumination is still a challenging task. In this paper, we introduce a new data structure based on a 3d grid of it-radiance vectors to stor...
详细信息
ISBN:
(纸本)9781605582139
Streaming data to efficiently render complex 3d scenes in presence of global illumination is still a challenging task. In this paper, we introduce a new data structure based on a 3d grid of it-radiance vectors to store the indirect illumination appearing on complex anddetailed objects: the Irradiance Vector Grid (IVG). this representation is independent of the geometric complexity and is suitable for quantization to different quantization schemes. Moreover, its streaming over network involves only a small overhead compared to detailed geometry, and can be achieved independently of the geometry. Furthermore, it can be efficiently rendered using modem graphics hardware. We demonstrate our new data structure in a new remote 3d visualization system, that integrates indirect lighting streaming and progressive transmission of the geometry, and study the impact of different strategies on data transfer.
Nowadays medical training simulators play an important role in education and further training of surgeons. With Virtual Reality based training systems it is possible to simulate a surgery under realistic conditions. I...
详细信息
ISBN:
(纸本)9781605582139
Nowadays medical training simulators play an important role in education and further training of surgeons. With Virtual Reality based training systems it is possible to simulate a surgery under realistic conditions. Input data for the Visualization of anatomic structures is tomographic image data. For the visualization of medical datagets direct volume rendering is the method of choice. In this paper we introduce a system based on the new X3d extension proposal of the Medical Working Group for a volume rendering component, with some extensions for controlling the speed vs. quality trade-off. For a convincing and instructive training simulation, our implementation delivers high performance combined with high quality visualization of medical datasets. Furthermore, it integrates haptic force-feedback devices to assure realistic interactions.
this paper describes a prototype of a web-based3ddesign and energy modeling platform called "Atmospheres". A webGL based3d geometry modeling anddata visualization interface that runs in any modern web-br...
详细信息
3d visual interfaces are effective, attractive, and are considered as a key factor to add value to various software applications improving the overall user experience. the web is one of the domains where 3d visual int...
详细信息
ISBN:
(纸本)9781457707001
3d visual interfaces are effective, attractive, and are considered as a key factor to add value to various software applications improving the overall user experience. the web is one of the domains where 3d visual interfaces can bring advantages, andthe recent integration between 3d andweb technologies, driven by html5 andwebGL, establishes good basis to extendweb applications with3d features. However, much work must be done to promote html5 andwebGL from the role of enabling technology to the role of solid foundation for enterprice level applications. In this scenario the focus of the paper is on outlining some guidelines and a workflow to add3ddata visualization features to existing web applications. the paper also discusses the main results we achieved applying these guidelines to two different application fields.
We present a lightweight framework composed of two extensions to introduce precomputed radiance transfer (PRT) to X3d. depending on the basis function, PRT is used to simulate shading, complex light transfer and effec...
详细信息
ISBN:
(纸本)9781605582139
We present a lightweight framework composed of two extensions to introduce precomputed radiance transfer (PRT) to X3d. depending on the basis function, PRT is used to simulate shading, complex light transfer and effects like subsurface scattering and caustics in real time by projecting incident light and transfer functions into frequency space, which allows the solution of the integration of the rendering equation through a simple dot product. Light transfer from incident to transferred radiance thus becomes a matter of solving dot products of coefficient vectors, which can be easily evaluated on the GPU. In this paper, we identify the minimal set of components needed for all X3d application to use spherical harmonic based PRT, anddiscuss how further enhancements to PRT can be implemented, like new basis functions and other features.
暂无评论