Helmuth Trefftz

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The availability of inexpensive and powerful graphics cards as well as fast Internet connections make Networked Virtual Environments viable for millions of users and many new applications. It is therefore necessary to cope with the growing heterogeneity that arises from differences in computing power, network speed and users' preferences. This paper(More)
In this paper we explore to what degree shared viewpoints in three-dimensional collaborative virtual environments enable effective collaboration. The paper applies research on shared viewpoints and telepointers to 3D environments. A lightweight Java-based tool for creating collaborative virtual environments was developed and used in the study. The system is(More)
The use of Shared Virtual Environments is growing in areas such as multi-player video games, military and industrial training, and collaborative design and engineering. As a result, different mixes of computing power and graphics capabilities of the participating computers arise naturally as the variety of people/organizations sharing a virtual environment(More)
In this paper we report results of the use of a telepresence application in a simulated distance education setting. The application combines video-conference with a networked virtual environment in which the instructor and the students can experiment with virtual object in a collaborative manner. The teaching for Understanding (TFU) framework is used as the(More)
The recent advances in the fields such as modeling bio-mechanics of living tissues, haptic technologies, computational capacity, and virtual environments have created conditions necessary in order to develop effective surgical training and learning methods. Simulation environments for surgical training have no limitations on the number of times a procedure(More)
Stand-alone and networked surgical simulators based on virtual reality have been proposed as a means to train surgeons in specific surgical skills with or without expert guidance and supervision. However, a surgical operation usually involves a group of medical practitioners who cooperate as team members. To this end, CNVSS have been proposed for the(More)