public ButtonHit(ButtonEntity entity, float sqrDistance)
 {
     this.entity      = entity;
     this.sqrDistance = sqrDistance;
 }
 public virtual void EnterTrigger(ButtonEntity entity)
 {
 }
 public virtual void OffTrigger(ButtonEntity entity)
 {
 }
 public virtual void Submit(ButtonEntity entity)
 {
 }
 public virtual void StayTrigger(ButtonEntity entity)
 {
 }