protected Vector3f localOffset(Vector3f storeResult) {
        Vector3f result = (storeResult == null) ? new Vector3f() : storeResult;
        result.set(localOffset);
        return result;
    }
Copy the local offset of this link.

@param storeResult storage for the result (modified if not null)
@return the offset (in bone local coordinates, either storeResult or a
new vector, not null)
jme3-jbullet/src/main/java/com/jme3/bullet/animation/PhysicsLink.java