It can read .DXF and its own .A3D file format. While it's possible to use third-party software to create objects, Alice comes with a rich assortment of objects and thousands more are available over the Internet. Sced Created by Steve Chenney, Sced is a modeling program that makes use of geometric constraints to edit objects in a virtual world. Sced uses constraints to facilitate the accurate placement of objects and provides a maintenance system for keeping constraints satisfied as the scene is modified. For example, once you can constrain a teapot to the center of a tabletop, you can move the table and the teapot will move along with it.
Constraints make it easy to create and position jointed figures.
Moving a hand will cause a constrained arm and shoulder to move appropriately. Sced provides a variety of simple primitive objects and can import Digital Equipment Corporation's OFF format. Sced saves modeling information in its native .scn format for future editing and can export to a wide variety of rendering formats, including RIB, POV, Rayshade, Radiance and VRML among others. Sced runs on almost any Unix platform with X Window System and is available at the Sced home page . There you'll find tutorials, example scenes and binaries for several popular platforms.