public override int GetHashCode()
{
const int prime = 31;
int result = 1;
result = prime * result + ((Ex == null) ? 0 : Ex.GetHashCode());
result = prime * result + ((Ey == null) ? 0 : Ey.GetHashCode());
result = prime * result + ((Ez == null) ? 0 : Ez.GetHashCode());
return result;
}