@Override
    public void render(RenderManager rm) {
        if (!isEnabled()) {
            return;
        }
        rm.renderScene(debugNode, getApplication().getViewPort());
    }
Set the scenes for which to render light gizmos.

@param scene the root of the desired scene (alias created)
jme3-core/src/main/java/com/jme3/environment/util/LightsDebugState.java