public Node getAttachmentsNode(String jointName) {
        Joint b = armature.getJoint(jointName);
        if (b == null) {
            throw new IllegalArgumentException("Given bone name does not exist "
                    + "in the armature.");
        }

        updateTargetsAndMaterials(spatial);
        int boneIndex = armature.getJointIndex(b);
        Node n = b.getAttachmentsNode(boneIndex, targets);
        /*
         * Select a node to parent the attachments node.
         */
        Node parent;
        if (spatial instanceof Node) {
            parent = (Node) spatial; // the usual case
        } else {
            parent = spatial.getParent();
        }
        parent.attachChild(n);

        return n;
    }
Access the attachments node of the named bone. If the bone doesn't
already have an attachments node, create one and attach it to the scene
graph. Models and effects attached to the attachments node will follow
the bone's motions.

@param jointName the name of the joint
@return the attachments node of the joint
jme3-core/src/main/java/com/jme3/anim/SkinningControl.java