private void OnTriggerExit(Collider other)
 {
     if (!other.isTrigger)
     {
         SnowBallGrowth component = other.gameObject.GetComponent <SnowBallGrowth>();
         if (component != null)
         {
             snowballsInside.Remove(component);
         }
     }
 }
 public bool SnowballInsideCave(SnowBallGrowth snowball)
 {
     return(snowballsInside.Contains(snowball));
 }