@Override
    protected void initialize(Application app) {
        debugNode = new Node("Environment debug Node");
        Sphere s = new Sphere(16, 16, 0.15f);
        debugGeom = new Geometry("debugEnvProbe", s);
        debugMaterial = new Material(app.getAssetManager(), "Common/MatDefs/Misc/reflect.j3md");
        debugGeom.setMaterial(debugMaterial);
        debugBounds = BoundingSphereDebug.createDebugSphere(app.getAssetManager());
        if (scene == null) {
            scene = app.getViewPort().getScenes().get(0);
        }
    }
A debug state that will display Light gizmos on screen.
Still a wip and for now it only displays light probes.

@author nehon
jme3-core/src/main/java/com/jme3/environment/util/LightsDebugState.java