@Override
    public void setMaterial(Material mat) {
        for (int i = 0; i < children.size(); i++) {
            children.get(i).setMaterial(mat);
        }
    }
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