I was looking at this video: [video][MikuPet] juego de Miku para PC, PC game of Miku - YouTube and I wondered is it possible to make game with this kind of interface with current jME?
You could by setting the app window border n JME3 to borderless with System.setProperty(“org.lwjgl.opengl.Window.undecorated”, “true”) (Bear in mind this won’t work once JME3 goes to JOGL, which will then require a different method to set window decorations)
After that, you could set the viewport background color to clear using:
http://hub.jmonkeyengine.org/javadoc/com/jme3/renderer/ViewPort.html#setClearColor(boolean) (Set this to false)
Then you would set setPauseOnLostFocus(boolean pauseOnLostFocus) to false in your main app class.
After that, it’s just business as usual. (Putting the model in the rootNode, adding animations and user interactions, adding the GUI, possibly SystemTray notifications with http://docs.oracle.com/javase/tutorial/uiswing/misc/systemtray.html)