Rendering in Xith

Hello i am new to Graphics and Opengl .Please help me ??? as I am not getting how Xith does the rendering by using RenderPeerImpl and Canvas3D . I mean that i know “A object is rendered by traversing the scenegraph from root to leaf” but i found no code where any traversing is performed from Virtual Universe to Locale and than to BranchGroup and subsequent nodes …
Take an example : We have to render a Cube than what will be the sequence of operations for rendering …
Thanks in advance

then the cube is a branchgroup or transformgroup
u add the one to your root branchgroup

read the java3d tutorials http://java.sun.com/developer/onlineTraining/java3d/, the principles are the same.

thanks for the link , will look into it.

there is also the Xith tutorial, but without all the background.