public void Add(BlackHole item)
{
Debug.Assert(item != null, "item is null.");
BlackHoleList.Add(item);
EntityList.Add(item);
GravityPointList.Add(item);
}
/* Resets all entity lists to empty */
private void ClearLists()
{
PlayerList.Clear();
PlanetList.Clear();
ProjectileList.Clear();
BlackHoleList.Clear();
BloodParticleList.Clear();
EntityList.Clear();
PhysicalObjectList.Clear();
GravityPointList.Clear();
}
