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In recent years, technological developments have made it possible to build interactive 3D models of objects and 3D Virtual Environments that can be experienced through the Web, using common, low-cost personal computers. As in the case of Web-based hypermedia, adaptivity can play an important role in increasing the usefulness, effectiveness and usability of 3D Web sites, i.e., Web sites distributing 3D content. This paper introduces the reader to the concepts, issues and techniques of adaptive 3D Web sites. [ABSTRACT FROM AUTHOR]

In this paper we present a method to generate compact and accuracy-controllable free-form surfaces for web-based surgical simulations. Users can input an important area where high accuracy is required, such as an affected area. The input area can be reflected as meshes with high level of details. By utilizing display tablet interfaces, surgeons are able to draw incision lines or boundaries between organs on an on-screen 3D model, just like they draw lines on paper in surgical planning procedures. Input lines can be reflected as boundaries between patches on free-form surfaces. Practical surgical simulators are also presented to evaluate the efficiency of our framework. [ABSTRACT FROM AUTHOR]