@Override
    public void setLodLevel(int lod) {
        super.setLodLevel(lod);
        for (Spatial child : children.getArray()) {
            child.setLodLevel(lod);
        }
    }
Returns all children to this node. Note that modifying that given
list is not allowed.

@return a list containing all children to this node
jme3-core/src/main/java/com/jme3/scene/Node.java