Collaborative virtual environments (CVEs) have been proposed for a wide range of applications, including reviewing design in manufacturing industry, training astronauts, simulating the ergonomic aspects of handling materials in a factory, and visualizing and interpreting data in the oil and gas industry. Multiple users in CVEs can cooperate at any of three levels. On the first level, users coexist in the CVE and can perceive and communicate with each other. On the second level, each user can individually modify the contents of a scene. Only on the third level can users simultaneously act on the same object and jointly…
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