/// <summary>
/// Remove all identical vertices.
/// </summary>
public void RemoveDuplicates()
{
List<Vertex> unique = new HashSet<Vertex>(Vertices).ToList();
List<int> indicesOld = Indices;
Indices = new List<int>();
for (int i = 0; i < indicesOld.Count; i++)
{
int index = unique.FindIndex(item => item == Vertices[i]);
Indices.Add(index);
}
Vertices = unique;
}