I would like to add an interactive 3-D rotation to my web page and I was wondering if someone could suggest what I could look into. I understand U3D is a common format for doing this in PDF files. Is that the format I would need to use in a web page? Would I need a Java applet to set this up? I have looked on-line but not successful in finding anything useful. I am using Mathematica. I simply wish to plot a 3D graph and give the reader the ability to use the mouse to rotate it freely. Could anyone suggest a simple example on the web I could review the code for?