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State Sync Question



  • Hey there,

    This might just be a lack of me understanding so I apologize in advance if so, but i seem to be having some trouble understanding the state sync.

    Also know the code is just thrown together for learning purposes and to see if i can get something working.

    My Server Code:

    export class Player {
        id: string;
    
        position: {
            x: number,
            y: number,
            z: number
        } = {
            x: 0,
            y: 0,
            z: 0
        };
    
        updatePosition(key) {
            switch(key) {
                case 'A':
                  this.position.x -= 0.1;
                case 'S':
                  this.position.z -= 0.1;
                case 'D':
                  this.position.x += 0.1;
                case 'W':
                  this.position.z += 0.1;
                default:
                  break;
            }
        }
    }
    

    Then in the main Room code after a player has joined, i listen for a input message and call the above code with this:

    onMessage (client, data) {
        console.log(client.id, "sent", data)
    
        if (data.action) {
          if (data.action === 'Input') {
            this.handleMovement(client.sessionId, data.key)
          }
        }
      }
    
    handleMovement (id, key) {
        this.state.players[id].updatePosition(key);
      }
    

    In my unity client side i have this code.

    IEnumerator Start () {
            ...
            room.Listen ("players/:id/:position/:attribute", this.OnPlayerChange);
            ...
    }
    
    void HandlePlayerInput() 
    {
            if (Input.GetKeyDown("a"))
            {
                room.Send(new { action = "Input", key = "A"});
            }
            if (Input.GetKeyDown("s"))
            {
                room.Send(new { action = "Input", key = "S"});
            }
            if (Input.GetKeyDown("d"))
            {
                room.Send(new { action = "Input", key = "D"});
            }
            if (Input.GetKeyDown("w"))
            {
                room.Send(new { action = "Input", key = "W"});
            }
    }
    
    void OnPlayerChange(DataChange change) 
    {
            GameObject curPlayer;
            players.TryGetValue(change.path["id"], out curPlayer);
    
            if (curPlayer)
            {
                switch (change.path["attribute"])
                {
                    case "x":
                        curPlayer.transform.position = new Vector3(float.Parse(change.value.ToString()), curPlayer.transform.position.y, curPlayer.transform.position.z);
                        break;
                    case "y":
                        curPlayer.transform.position = new Vector3(curPlayer.transform.position.x, float.Parse(change.value.ToString()), curPlayer.transform.position.z);
                        break;
                    case "z":
                        curPlayer.transform.position = new Vector3(curPlayer.transform.position.x, curPlayer.transform.position.y, float.Parse(change.value.ToString()));
                        break;
                    default:
                        break;
                }
    
            }
    }
    

    All of this works Kinda great. I see the box spawn, i can kinda move it around, but the movement isn't perfect.

    When i hit the "a" key nothing happens. I logged once on the server and it is setting my players x position to -0.1, but the message never seems to come to unity.

    When i hit "w" all works as expected. (box moves up the z plane, camera is directly above box so x,z planes are the movements.)

    When i hit "d" the box moves both up the x plane and the z plane in a diagonal direction?

    And finally when i hit the "s" button nothing happens.

    Any ideas as to what i might be doing wrong?

    Thanks,
    Cody



  • Nevermind.......

    As soon as i hit submit i see i dont have break in my JS switch code on the server...

    /facepalm.

    Loving the library so far, great work!