public TwistMessage(Vector3Message linear, Vector3Message angular)
 {
     this.linear  = linear;
     this.angular = angular;
 }
 public TransformMessage()
 {
     translation = new Vector3Message();
     rotation    = new QuaternionMessage();
 }
 public TwistMessage()
 {
     this.linear  = new Vector3Message();
     this.angular = new Vector3Message();
 }