several vaguely related projects worked on by me: a 3d engine with a javascript-like scripting language (pdsys); an older scheme dialect (vmsys); ... (2009-04-28: I have been gone for years, may try to put up some newer stuff...).
Java Inventor is a Java interface to Open Inventor. Open Inventor (http://oss.sgi.com/projects/inventor/) is a popular API for developers of 3D applications. Java Inventor uses the Java Native Interface (JNI) to access the Open Inventor C++ libraries.