public void depthFirstTraversal(SceneGraphVisitor visitor) {
        depthFirstTraversal(visitor, DFSMode.POST_ORDER);
    }
Visit each scene graph element ordered by DFS with the default post order mode.

@param visitor the action to take for each visited Spatial
@see #depthFirstTraversal(com.jme3.scene.SceneGraphVisitor, com.jme3.scene.Spatial.DFSMode)
jme3-core/src/main/java/com/jme3/scene/Spatial.java