Paint in 3D
Paint in 3D用於在遊戲內和編輯器裡繪製所有物體。所有功能已經過深度優化，在WebGL、移動端、VR 以及更多平臺用起來都非常好用！
它支援標準管線，以及 LWRP、HDRP 和 URP。通過使用GPU 加速，你的物體將以難以置信的速度被繪製。程式碼還經過深度優化來防止GC，和將所有繪製操作一起批次完成。
跟貼圖系統不同，它是一個紋理繪製解決方案。這意味著你可以繪製你的物體上百萬次，還是無幀率丟失，讓你創作難以想象的遊戲。
它在Unity應用商店上的售價是60美元，地址：https://assetstore.unity.com/packages/tools/painting/paint-in-3d-26286。
Photon
Photon中文翻譯為“光子”，為有著15年伺服器後端開發經驗的德國Exit Games公司開發的高效，穩定，可擴充的網路引擎。為目前世界上使用者最廣泛，支援遊戲型別最多的專業網路引擎之一，也是Unity應用商店裡使用者評價最高的網路元件。
世界多個知名遊戲公司和工作室選用Photon作為其產品的網路支援引擎，其中包括WB華納，Codemaster, 2K, Glu, 微軟遊戲工作室，史克威爾艾尼克斯，百代南夢宮，SandBox，雨神電競等知名企業，也有許多工作室和新創企業正在瞭解和試用Photon之中。
它在Unity應用商店上有一個免費應用，地址：https://assetstore.unity.com/packages/tools/network/pun-2-free-119922。
當然，Photon需要註冊賬號、建立應用等操作才能使用，還不瞭解的同學可以去官方網站查閱相關資料。
溫馨提示：Photon的國外伺服器在國內使用比較卡，所以最好去中國官網申請國內的伺服器，申請地址：https://vibrantlink.com/chinacloudapply/。
下面正式開始。
建立工程
使用Unity Hub建立一個3D專案，然後分別引入Paint in 3D和Photon Unity Networking 2，如下圖：
溫馨提示：在引入Photon Unity Networking 2後，記得配置AppId。
建立簡易畫板
為了方便演示，我們建立一個Quad作為畫板，然後為其新增P3dPaintable、P3dMaterialCloner和P3dPaintableTexture元件，使用它們的預設配置即可，如下圖：
然後，建立一個空的GameObject命名為OneMorePaint，然後向OneMorePaint新增P3dPaintSphere元件，修改P3dPaintSphere元件的Color為紅色，其他配置保持預設不變，如下圖：
再向OneMorePaint新增P3dHitScreen元件，勾選上P3dHitScreen元件的ConnectHits，其他配置保持預設不變，如下圖：
這時候，建立簡易畫板就做好了，執行以後就可以畫畫了，如下圖：
只不過，還是個單機版，我們加上實時線上功能。
連線PUN2伺服器
建立一個C#指令碼命名為Launcher，再建立一個空的GameObject命名為LauncherGameObject，把C#指令碼Launcher新增到LauncherGameObject中。
編輯C#指令碼Launcher為如下內容：
using Photon.Pun;
using Photon.Realtime;
using UnityEngine;
namespace One.More
{
public class Launcher : MonoBehaviourPunCallbacks
{
#region Private Fields
/// <summary>
/// This client's version number. Users are separated from each other by gameVersion (which allows you to make breaking changes).
/// </summary>
string gameVersion = "1";
/// <summary>
/// Keep track of the current process. Since connection is asynchronous and is based on several callbacks from Photon,
/// we need to keep track of this to properly adjust the behavior when we receive call back by Photon.
/// Typically this is used for the OnConnectedToMaster() callback.
/// </summary>
bool isConnecting;
#endregion
void Start()
{
this.Connect();
}
#region MonoBehaviourPunCallbacks Callbacks
public override void OnConnectedToMaster()
{
Debug.Log("PUN Basics Tutorial/Launcher: OnConnectedToMaster() was called by PUN");
// we don't want to do anything if we are not attempting to join a room.
// this case where isConnecting is false is typically when you lost or quit the game, when this level is loaded, OnConnectedToMaster will be called, in that case
// we don't want to do anything.
if (isConnecting)
{
// #Critical: The first we try to do is to join a potential existing room. If there is, good, else, we'll be called back with OnJoinRandomFailed()
PhotonNetwork.JoinRandomRoom();
isConnecting = false;
}
}
public override void OnDisconnected(DisconnectCause cause)
{
Debug.LogWarningFormat("PUN Basics Tutorial/Launcher: OnDisconnected() was called by PUN with reason {0}", cause);
isConnecting = false;
}
public override void OnJoinRandomFailed(short returnCode, string message)
{
Debug.Log("PUN Basics Tutorial/Launcher:OnJoinRandomFailed() was called by PUN. No random room available, so we create one.\nCalling: PhotonNetwork.CreateRoom");
// #Critical: we failed to join a random room, maybe none exists or they are all full. No worries, we create a new room.
PhotonNetwork.CreateRoom(null, new RoomOptions());
}
public override void OnJoinedRoom()
{
Debug.Log("PUN Basics Tutorial/Launcher: OnJoinedRoom() called by PUN. Now this client is in a room.");
}
#endregion
#region Public Methods
/// <summary>
/// Start the connection process.
/// - If already connected, we attempt joining a random room
/// - if not yet connected, Connect this application instance to Photon Cloud Network
/// </summary>
public void Connect()
{
// we check if we are connected or not, we join if we are , else we initiate the connection to the server.
if (PhotonNetwork.IsConnected)
{
// #Critical we need at this point to attempt joining a Random Room. If it fails, we'll get notified in OnJoinRandomFailed() and we'll create one.
PhotonNetwork.JoinRandomRoom();
}
else
{
// #Critical, we must first and foremost connect to Photon Online Server.
isConnecting = PhotonNetwork.ConnectUsingSettings();
PhotonNetwork.GameVersion = gameVersion;
}
}
#endregion
}
}
這時候，就可以連線到連線PUN2伺服器了，執行以後我們可以看到如下日誌：
實時線上同步
向之前建立的OneMorePaint新增PhotonView元件，使用預設配置即可，如下圖：
建立一個C#指令碼命名為OnlinePainting，把C#指令碼OnlinePainting新增到OneMorePaint中。
編輯C#指令碼OnlinePainting為如下內容：
using PaintIn3D;
using Photon.Pun;
using UnityEngine;
namespace One.More
{
public class OnlinePainting : MonoBehaviour, IHitPoint, IHitLine
{
private PhotonView photonView;
private P3dPaintSphere paintSphere;
void Start()
{
this.photonView = this.GetComponent<PhotonView>();
this.paintSphere = this.GetComponent<P3dPaintSphere>();
}
public void HandleHitPoint(bool preview, int priority, float pressure, int seed, Vector3 position, Quaternion rotation)
{
if (preview)
{
return;
}
if (this.photonView == null)
{
Debug.LogError("PhotonView is not found.");
return;
}
this.photonView.RPC("HandleHitPointRpc", RpcTarget.Others, preview, priority, pressure, seed, position, rotation);
}
public void HandleHitLine(bool preview, int priority, float pressure, int seed, Vector3 position, Vector3 endPosition, Quaternion rotation, bool clip)
{
if (preview)
{
return;
}
if (this.photonView == null)
{
Debug.LogError("PhotonView is not found.");
return;
}
this.photonView.RPC("HandleHitLinetRpc", RpcTarget.Others, preview, priority, pressure, seed, position, endPosition, rotation, clip);
}
[PunRPC]
public void HandleHitPointRpc(bool preview, int priority, float pressure, int seed, Vector3 position, Quaternion rotation)
{
if (this.paintSphere == null)
{
Debug.LogError("P3dPaintSphere is not found.");
return;
}
this.paintSphere.HandleHitPoint(preview, priority, pressure, seed, position, rotation);
}
[PunRPC]
public void HandleHitLinetRpc(bool preview, int priority, float pressure, int seed, Vector3 position, Vector3 endPosition, Quaternion rotation, bool clip)
{
if (this.paintSphere == null)
{
Debug.LogError("P3dPaintSphere is not found.");
return;
}
this.paintSphere.HandleHitLine(preview, priority, pressure, seed, position, endPosition, rotation, clip);
}
}
}
線上塗鴉畫板就製作完成了，我們看看執行效果怎麼樣？
執行效果
構建以後，同時啟動兩個客戶端，效果如下：
當然，這只是簡單的線上塗鴉畫板，你還可以再此基礎上新增更豐富的功能，比如：修改畫筆顏色、修改畫筆大小等等。
最後，謝謝你這麼帥，還給我點贊和關注。