@Override
    public void update(float tpf) {
        if (!isEnabled()) {
            return;
        }
        updateLights(scene);
        debugNode.updateLogicalState(tpf);
        debugNode.updateGeometricState();
        cleanProbes();
    }
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