Project extranet services that rely on copying files to a centralized server suffer from this drawback as well. Independent of the Web, however, any Internet-connected computer can be a server, making local documents available to others without first dragging copies around to central servers. None of the collaborators need the software that created the file, and virtually unlimited users in diverse locations can concurrently share an interactive view of a file. Because only the changes to files are transmitted, the responsiveness of communication is much faster than browser-based file viewing. Though it is not free, as most browsers are, EZ is inexpensive for its power and functionality.
Some software programs are better at adding light than others.
The authenticity of these computer-rendered images depends on many sophisticated computer algorithms, but two of the most important are radiosity and ray tracing. The Lightscape Visualization System is among the few programs combining these two algorithms to produce great realism. Radiosity simulates the dispersion of natural and artificial light and the way that light bounces among various surfaces and materials. Because it accounts for all the light in a space, radiosity is especially useful in representing subtleties, such as indirect light, soft shadows, and color bleeds-the pinkish glow of a white chair on a red carpet, for example. Ray tracing follows the path of all the rays of light entering an observer's eye from every point within a specific view.