This paper addresses the problem of accurately tracking the 3D motion of a monocular camera in a known 3D environment and dynamically estimating the 3D camera location. For that purpose we propose a fully automated la...
详细信息
We speculate on the possibilities for a realization of the idea of a three-dimensional cyberspace, as sketched in the novels of William Gibson, using today's technology. Virtual reality and global networks such as...
详细信息
We speculate on the possibilities for a realization of the idea of a three-dimensional cyberspace, as sketched in the novels of William Gibson, using today's technology. Virtual reality and global networks such as the Internet together can provide the fundamentals for such an effort. From an examination of the technological principles of a Gibsonian virtual environment, we conclude what properties such an implementation must have. An implementation of a system with these properties faces a number of problems in the large and in the small;in particular, the semantics of the virtual environment and its inhabitants must be defined. We also report on our ongoing implementation of a prototype software system that was designed to evaluate the feasibility of these ideas.
A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent Engineering of Layered Structure...
详细信息
A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent Engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.
作者：
Stytz, MRKunz, AA[o_1]Virtual Environments
3D Medical Imaging and Computer Graphics Laboratory Air Force Institute of Technology Wright-Patterson Air Force Base OH 45433 [o_2]Virtual Environments
3D Medical Imaging and Computer Graphics Laboratory Air Force Institute of Technology Wright-Patterson Air Force Base OH 45433
The Satellite Modeler (SM) is a distributed virtual environment application that simulates the near-Earth space environment and portrays 3D graphical satellite models moving in their correct orbits around the Earth. T...
详细信息
The Satellite Modeler (SM) is a distributed virtual environment application that simulates the near-Earth space environment and portrays 3D graphical satellite models moving in their correct orbits around the Earth. The system allows the user to view satellites in orbit from both a space-based and Earth-based point of view. The Satellite Modeler provides capabilities that allow a user to interact with multiple satellite models and with active satellite constellations. The user can establish satellite constellations. The user can establish satellite orbital parameters during distributed virtual environment initialization and while the virtual environment is running. The system also functions as a network actor in a distributed virtual environment. The Satellite Modeler achieves realistic physical modeling of satellite orbital motion by basing its orbital calculations upon orbital mechanics and NORAD orbital element descriptions for satellites in orbit.
The manipulation of a virtual object by means of a digital glove is a tedious task for repetitive position and orientation adjustments. In this paper we try to overcome the lack of force feedback of general purpose di...
详细信息
This paper presents an algorithm for solving the complex and critical problem of bending sequence in sheet metal manufacturing. Finding the bending sequence and required tool assignment presents a large combinatorial ...
详细信息
The paper presents a model of nonverbal communication and interpersonal relationship between virtual actors. Nonverbal communication improves their believability. They react not only to the presence of the other actor...
详细信息
Optical beacon tracking (OBT) is gaining importance for real-time object position and orientation sensing. We assess the limits of this method and present both practical and theoretical accuracy figures. The basic geo...
详细信息
Virtual Actors now play an important role in computer-generated films, Virtual Environments, Telecooperative work, and multimedia. In order to make these actors realistic, it is essential to represent their body shape...
详细信息
ISBN:
(纸本)9780818675188
Virtual Actors now play an important role in computer-generated films, Virtual Environments, Telecooperative work, and multimedia. In order to make these actors realistic, it is essential to represent their body shape during the motion. In this paper we present different methods for representing realistic deformations for virtual humans with various characteristics: sex, age, height, weight. Our methods based on a combination of metaballs and splines could be applied to frame-by-frame computer generated-films and Virtual Environments. Several examples are presented: autonomous actors, animation based on flock of birds, networked Virtual Environments.
A complex compressible Navier-Stokes equation using a time-accurate, implicit difference scheme is parallelized using Domain Decomposition (DD) and loop-parallelization methods. The numerical scheme used is a LU-ADI m...
详细信息
A complex compressible Navier-Stokes equation using a time-accurate, implicit difference scheme is parallelized using Domain Decomposition (DD) and loop-parallelization methods. The numerical scheme used is a LU-ADI method with Baldwin-Lomax turbulence model. The report discusses how the code is parallelized using the techniques. The convergence rate and computational speed-up of these two methods are illustrated in the numerical experiment described in the report. Generally, the loop-parallelization shows better convergence and speed-up than the domain-decomposition method.
暂无评论