But Java 3D is not easy to learn how to get it to work!
It's all there, just see the Pdf file!
See also my YouTube VIDEOS!
...But I'll have a go at step-by-step instructions, too:
Step 1: 3D object
Java, those clever guys, have a solution for you!
Only, and that's the curse of some real good Freeware, getting that thing to work is, in the words of the immortal James Brown, a mother!
So here's a tutorial, so as to prove you can learn something step-by-step, here.
First, of course, if you're to show a 3D file on a Web page, you need to build a 3D file.