The applet at the bottom of this page -- assuming that you have a Java-enabled browser -- let's you write scene descriptions in a simple language. The applet can display still images and animations described in this language. Images are displayed as wireframe models. The point is to learn something about geometric modeling and geometric transformations, which are important in computer graphics. The applet was written by David Eck for use with his introductory computer science textbook The Most Complex Machine. However, it can also be used on its own.
The applet below is set up to load some sample programs. Click on the "RENDER" button to see the image or animation described by a program. Use the pop-up menu at the top of the applet to select among the sample programs. Full information is available about the applet and its scene description language on the xModels Info page. A number of tutorial examples are also available.