/// <summary>
/// keep sure input is ccw
/// </summary>
public HEFace AddFace(IndexN <int> vindice)
{
Debugs.Assert(vindice.All(id => id >= 0 && id < VertexCount));
var vertice = new List <HEVertex>(vindice.Length);
for (int i = 0; i < vindice.Length; i++)
{
vertice.Add(_vertices[vindice[i]]);
}
return(AddFace(vertice));
}