Perspective projection in combination with head tracking is widely used in immersive virtual environments to support users with correct spatial perception of the virtual world. However, most projection based

Virtual reality has been in the public eye for nearly forty years. Its early promise was vast: worlds we could visit and live in, if we could bend the technology to our desires. Progress was made, but along the way the original directions and challenges of fully immersive VR took a back seat

Figure 1: The textual Web interface versus the WORDGRAPH visualization of the NETSPEAK writing assistant. NETSPEAK helps writers in choosing words while writing a text. It checks for the commonness of phrases and allows for the retrieval of alternatives by means of wildcard queries. To support such queries, we implement a scalable retrieval engine, which returns high-quality results within milliseconds using a probabilistic retrieval strategy. The results are displayed as WORDGRAPH visualization or as a textual list. The graphical interface provides an effective means for interactive exploration of search results using filter techniques, query expansion and navigation. Our observations indicate that, of three investigated retrieval tasks, the textual interface is sufficient for the phrase verification task, wherein both views support context-sensitive word choice, and the WORDGRAPH best supports the exploration of a phrase’s context or the underlying corpus. The preferred view for context-sensitive word choice seems to depend on query complexity (i.e. the number of wildcards in a query).

In this paper we describe a number of issues which are central to the design of a software architecture for a distributed, generic, virtual reality system. These include support for diverse and demanding applications, the management of time to provide high-quality interaction with tightly

is overviewed to stress the compatibility of the system with other similar Virtual Reality systems. The software provides realistic virtual actors as well as sets of applicable high-level actions in real-time. Related issues on obtaining actor models and animating them in realtime are presented. We also

... This document introduces some qualitative measures of complexity which may be used to asses virtual reality systems. A number of current virtual reality systems are considered with regard to the facilities and complexity which they support. Some key methods are identified which are used

. Current distributed virtual reality systems suffer from many inherent difficulties: inadequate network architecture, poor object distribution and coherency, poor system resource management, and poor overall performance. This paper outlines the NAVL DVR system, designed to overcome these problems

This document introduces some qualitative measures of complexity which may be used to asses virtual reality systems. A number of current virtual reality systems are considered with regard to the facilities and complexity which they support. Some key methods are identified which are used

Abstract. One of the main problems with virtual reality as a learning tool for vocational education is that there are hardly any theories or models upon which to found and justify the application development. This paper presents a model of virtual reality systems for vocational education

Abstract ⎯ Virtual Reality Systems for training have been proposed and developed with the objective to simulate real situations and to allow the acquisition of specific abilities of critical procedures. Basically a Virtual Reality System (VRS) is a real-time system that presents interaction