Add a line before calling 'segende' in the act method of the ND class to exit the method if the actor is not in the world: if (getWorld() == null) return;

@Doggygaming, I looked at your uploaded scenarios and I did not see any major problems with them. You seem to have much of the basics down pretty good. You must realize that I have many years of practice behind me.

@Doggygaming, you could try a different browser; or, there might be a setting in the current one you can change to allow applets to run in it.

@trimil, I guess you really cannot say I learnt this. I just did what I thought had to be done to get it to work. The Point class and the Surface classes for use in 3D space are the main contributors in getting it to work. A surface is described by its surrounding points and a body is described by it surfaces. So, I tried to keep this in order and have the body control the location of its surfaces (or rather, the points that describe its surfaces) by using its location and rotation around the three axes in space.

@smcgee, you do not need to score any point. Just make sure you are signed in on the site, finish a game and wait momentarily for the high scores to show. When they do, you will see the buttons that you can click to view the various class codes along the bottom of the window.

@smcgee, you can log in, play till lose (playing to lose, if you wish) and when the high-score screen shows, you will see buttons along the bottom to view the class codes.