/// <summary>
/// Add a HalfEdge to the end of the Loop.
/// </summary>
/// <param name="he"></param>
public void AddEdgeToEnd(HalfEdge he)
{
this.Edges.Add(he);
he.Loop = this;
}
/// <summary>
/// Add a HalfEdge ot the start of the Loop.
/// </summary>
/// <param name="he"></param>
public void AddEdgeToStart(HalfEdge he)
{
this.Edges.Insert(0, he);
he.Loop = this;
}