public void Unregister(MazeBody being, twin cell_pos)
{
if (bodyHeaps.ContainsKey(cell_pos))
{
bodyHeaps[cell_pos].Remove(being);
}
}
public void Register(MazeBody body, twin cell_pos)
{
if (!bodyHeaps.ContainsKey(cell_pos))
{
bodyHeaps[cell_pos] = new HashSet <MazeBody>();
}
bodyHeaps[cell_pos].Add(body);
}