Unity中Google RealTime联网玩家卡顿及穿地Bug技术求助

Hey there, let's break down the stuttering and collision issues you're facing with Google Play Games Real-Time Multiplayer, and walk through actionable fixes:

Key Issues & Solutions #

1. Network Congestion from Framerate-Locked Position Updates #

Right now, you're sending position data every single frame in Update(). This floods the network with redundant messages, leading to lag and dropped packets—directly causing the stutters you see.

Fix: Only send updates when the player's position changes significantly, or at a fixed, reasonable interval (not every frame):

// Add these variables to your player script
private Vector3 lastSentPosition;
public float positionChangeThreshold = 0.1f; // Only send if position shifts more than this
public float sendInterval = 0.1f; // Max 10 updates per second
private float timeSinceLastSend;

void Update() {
    timeSinceLastSend += Time.deltaTime;
    Vector3 currentPos = player.transform.position;

    // Send update only if enough time has passed OR position changed enough
    if (timeSinceLastSend >= sendInterval || Vector3.Distance(currentPos, lastSentPosition) >= positionChangeThreshold) {
        string playerTag = player == PlayerOne ? "PlayerOne" : "PlayerTwo";
        string playerData = $"{playerTag}:{currentPos.x}:{currentPos.y}";
        byte[] dataArr = System.Text.Encoding.ASCII.GetBytes(playerData);
        PlayGamesPlatform.Instance.RealTime.SendMessageToAll(false, dataArr);
        
        lastSentPosition = currentPos;
        timeSinceLastSend = 0f;
    }

    // Keep your existing touch input logic here...
}

2. Hard Position Jumps Causing Stutters & Collision Failures #

When you directly set transform.position on the receiving end, you're teleporting the player instead of smoothly moving them. This creates a stuttery look and bypasses collision detection (leading to players falling through ground).

Fix: Use smooth interpolation to transition between received positions:

// Add these variables to your receiving script
private Vector2 targetPosPlayerOne;
private Vector2 targetPosPlayerTwo;
public float smoothMoveSpeed = 6f; // Adjust this to control smoothness

void Update() {
    // Smoothly move PlayerOne towards its target position
    if (PlayerOne != null) {
        PlayerOne.transform.position = Vector2.Lerp(
            PlayerOne.transform.position, 
            targetPosPlayerOne, 
            smoothMoveSpeed * Time.deltaTime
        );
    }
    // Do the same for PlayerTwo
    if (PlayerTwo != null) {
        PlayerTwo.transform.position = Vector2.Lerp(
            PlayerTwo.transform.position, 
            targetPosPlayerTwo, 
            smoothMoveSpeed * Time.deltaTime
        );
    }
}

public void OnRealTimeMessageReceived(bool IsReliable, string SenderId, byte[] data) {
    string position = System.Text.Encoding.Default.GetString(data);
    string[] raw = position.Split(new string[] { ":" }, System.StringSplitOptions.RemoveEmptyEntries);
    
    if (raw.Length < 3) return; // Guard against malformed messages

    float x = float.Parse(raw[1]);
    float y = float.Parse(raw[2]);

    if (raw[0] == "PlayerOne") {
        targetPosPlayerOne = new Vector2(x, y);
        textik2.text = $"PlayerOne received: {position}";
    } else if (raw[0] == "PlayerTwo") {
        targetPosPlayerTwo = new Vector2(x, y);
        textik2.text = $"PlayerTwo received: {position}";
    }
}

3. Collision & Precision Problems #

The ground collision issue likely stems from either:

• Teleportation bypassing collision: The smooth interpolation fix above will resolve this, as it keeps the player moving incrementally through collision checks.
• Lost position precision: Converting floats to strings and back can lose decimal accuracy. For better precision, use binary serialization instead:

  // Sending side (replace string logic)
  Vector3 pos = player.transform.position;
  byte[] data = new byte[1 + sizeof(float) * 2];
  data[0] = player == PlayerOne ? (byte)0 : (byte)1; // Mark player ID
  Buffer.BlockCopy(BitConverter.GetBytes(pos.x), 0, data, 1, sizeof(float));
  Buffer.BlockCopy(BitConverter.GetBytes(pos.y), 0, data, 1 + sizeof(float), sizeof(float));
  PlayGamesPlatform.Instance.RealTime.SendMessageToAll(false, data);
  
  // Receiving side (replace string parsing)
  byte playerId = data[0];
  float x = BitConverter.ToSingle(data, 1);
  float y = BitConverter.ToSingle(data, 1 + sizeof(float));
  if (playerId == 0) {
      targetPosPlayerOne = new Vector2(x, y);
  } else {
      targetPosPlayerTwo = new Vector2(x, y);
  }
  

• Misaligned colliders: Double-check your prefab's collider (e.g., BoxCollider2D) to ensure it's perfectly aligned with the player sprite and covers the area you expect. If the collider is offset or too small, the player can clip through ground.

4. Unreliable Message Considerations #

You're using unreliable messages (SendMessageToAll(false, ...)), which can be dropped. For position data this is okay (since we send frequent updates), but adding a simple sequence number can prevent old, stale position updates from overriding newer ones.

内容的提问来源于stack exchange，提问作者W33vely