Get a Canvas3D, and set up  the Scene Graph

How to get a good GraphicsConfiguration to construct a Canvas3D ?

GraphicsConfigTemplate3D gcTemplate = new GraphicsConfigTemplate3D();

GraphicsEnvironment local = GraphicsEnvironment.getLocalGraphicsEnvironment();
// there could be more than one screen
GraphicsDevice screen = local.getDefaultScreenDevice();

GraphicsConfiguration configuration = screen.getBestConfiguration(gcTemplate);

// Get a Canvas3D and call its constructor with the configuration
mainCanvas3D = new Canvas3D(configuration);

// Add the canvas to a JPanel (which is part of a JFrame ...)
mainCanvas3D.setSize(200,200);   // and / or
setLayout(new Border Layout)
add("Center", mainCanvas3D)

// The general Scene graph
VirtualUniverse myUniverse = new VirtualUniverse();
Locale myLocale = new Locale(myUniverse);

// Create the two main branches (with your functions)
BranchGroup myScene = myCreateSceneBranch();
BranchGroup myView = myCreateViewBranch(mainCanvas3D); // a canvas3D is needed here !

// Add the two branches to the Locale ... AT THE END !!!
myLocale.addBranchGraph(myView);
myLocale.addBranchGraph(myScene);