SubScene works

Year it works!

The SubScene comming with java8 solved the problem I had with the including of a perspective camera into a node that is a child of a main scene.

So the new gui is prepared:

But there is another propblem comming with the SubScene:

1. The nodes inserted into the root element of the SubScene are rendered quiet bad. Looks like I have to repaint them sometimes.
2. The performance was better when using a separated Stage. You won't record that while handling a little amount of graphic elements. But if you load this house you will see the problem.