Implementing server authoritative movement

Now that we have our script structured the way we need, we can go ahead and implement the rest. First, we'll create a structure to hold move commands:

// represents a move command sent to the server
private struct move
{
  public float HorizontalAxis;
  public float VerticalAxis;
  public double Timestamp;

  public move( float horiz, float vert, double timestamp )
  {
    this.HorizontalAxis = horiz;
    this.VerticalAxis = vert;
    this.Timestamp = timestamp;
  }
}

On the server, we'll store a buffer of move states sent from the client. We'll also keep a reference to our Player script for the client and server:

// a history of move states sent from client to server
List<move> moveHistory = new List<move>();

// a reference to the Player script attached to the game object.
Player playerScript;

// get the Player component
void Start()
{
  playerScript = GetComponent<Player>();
}

Now, in FixedUpdate we'll grab the current move state...