The software then generates the necessary images. Hardware key needed for Windows version. In addition to the movie-output formats, images can be output in Virtual Reality Modeling Language 2 format for Web viewing. The amount of camera roll, smoothness of curves, etc., are under users' control. Currently, 3-D .dxf files are supported for objects.
Users can select a model and request that it be placed on a virtual surface.
A model can be located at coordinates provided in a database or placed interactively. It's also possible to select an object and duplicate it, such as creating a virtual forest from a single tree model. The 3-D models will be displayed with the degree of detail present, but additional detail will affect rendering times. Intervisibility, View Shed Analysis and Performance Two available analytical capabilities are intervisibility and view shed analysis. Intervisibility involves the computation and display of a dome above a given observer's position that displays the areas seen by the viewer.