public static void createSkeletons(FbxNode fbxNode) {
        boolean createSkeleton = false;
        for (FbxNode fbxChild : fbxNode.children) {
            if (fbxChild instanceof FbxLimbNode) {
                createSkeleton = true;
            } else {
                createSkeletons(fbxChild);
            }
        }
        if (createSkeleton) {
            if (fbxNode.skeleton != null) {
                throw new UnsupportedOperationException();
            }
            fbxNode.skeleton = FbxLimbNode.createSkeleton(fbxNode);
//            System.out.println("created skeleton: " + fbxNode.skeleton);
        }
    }
Create jME3 Skeleton objects on the scene. 

Goes through the scene graph and finds limbs that are 
attached to FBX nodes, then creates a Skeleton on the node
based on the child limbs.

Must be called prior to calling 
{@link #createScene(com.jme3.scene.plugins.fbx.node.FbxNode)}.

@param fbxNode The root FBX node.
jme3-plugins/src/fbx/java/com/jme3/scene/plugins/fbx/node/FbxNode.java