public static bool IsPaused(this Rigidbody body)
        {
            RigidbodyHelper helper = body.GetComponent <RigidbodyHelper> ();

            if (helper == null)
            {
                return(false);
            }
            return(helper.isPause);
        }
 public static void SetPlaySpeed(this Rigidbody body, float speed)
 {
     if (body.velocity.sqrMagnitude != 0 || body.angularVelocity.sqrMagnitude != 0 || body.IsPaused())
     {
         RigidbodyHelper helper = body.GetComponent <RigidbodyHelper> ();
         if (helper == null)
         {
             helper = body.gameObject.AddComponent <RigidbodyHelper> ();
         }
         helper.rigid = body;
         helper.SetPlaySpeed(speed);
     }
 }