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In this paper, we present the architecture of a new multimedia E-mail system, which has been successfully developed in the Communication and Multimedia Laboratory of National Taiwan University. This prototype E-mail system is fully compatible with traditional Internet E-mails in that the multimedia emails can be sent through Internet. For allowing one to compose multimedia emails, the system provides various editors for editing video, audio, image, graphics, and multilingual (English and Chinese) text. It is currently implemented on SUN Workstations with X-windows and OpenLook as its standard graphical user interface. In order to display video, the workstation are equipped with either an add-on video board or a software-based Codecs. Since its development, the system have been widely used in the National Taiwan University. Experience of users showed that the system is convenient to use and is indeed fully compatible with the traditional Internet E-mails.

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We propose a novel idea, carving, for visibility preprocessing of unrestricted (nonaxial) models. It is different from visibility preprocessing applied directly to nonaxial data. As a sculptor carves a statue, carving splits the nonaxial portion of a model, and results in a model with only axial polygons and a set of cuttings. The visibility information of the carved axial model can then be computed with the cuttings as detail objects.