【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建第九节：多线程同步协调处理多区块思想和基本实现

Author： plumn
发布时间：December 26, 2018
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第九节 多线程同步协调处理多区块思想和基本实现

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<p class="inser-title">【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建 第八节：多区块地形生成与隐藏</p>
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第八节 多区块地形生成与隐藏上一篇：新建EndlessTerrain脚本public const float ma...
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这节我们将继续上节的无限地形生成功能完善，将上节制作出来的视野内三维plane的显示和隐藏功能与我们的MapGenerator相结合，这里将会用到多线程技术，
之前我们第一节了解过协程的原理，这里多线程技术比协程更高级一些，这算是真正的多个线程都在一起跑，而不是协程的跳来跳去，适合处理一些短时间内计算量很大，任务数量较多，可以同步单独运算，同时又追求高效完成需要快速拿到多个运算结果的事情。
由于Unity系统限制，实际上我们unity本身是没有多线程的，我们的副线程是干不了前台的画面渲染，人物运动，物理碰撞，AI运算这些涉及到Unity SDK或者说继承于Monobehaviour的一些操作的，这些只能交给主线程，但是，这不代表多线程没有用，后台的数据运算，比如说伤害计算，MeshData数据构建，网络交互更新，一些复杂的I/O调取操作，都是可以通过分配给副线程去做的，多线程是c#里实现的，可以辅助unity达到多线程的效果，通过Action和Callback之类的指令，和unity主线程交互，决定下一步的运算或者释放。
多线程运算，涉及到的核心主要有两点，首先，**unity主线程和其他C#副线程的交互**，是一个重点，这个交互思想代码模板需要熟悉；
其次，**对于任务和计算的分配**，这个优先级和排序，也是一个重点，否则大家一起抢着干同一件事情，造成数据混乱，显然是帮倒忙，也是不可取的；
这一节，主要涉及到线程间交互方式，基本框架的构建和熟悉，这一块基本上都是标准模板，初学复杂，熟练后都是套路，代码看起来多，实际都是固定格式，不用害怕。
对于任务优先级排序，我们稍微了解下入门级的五个优先级排序，和Lock指令锁定分配任务和分派线程，今后有时间的话再聊聊Loom指令委托到主线程上进行调度，差不多就可以实现一些基础的多线程操作了，更复杂的，慢慢来，多线程就像一把封印的神器，需要不断积累经验，解封用法，才会用的更加强大。好了，我们正式开始：
在多线程编写前，我们需要打扫下之前的代码，
MapGenerator脚本，我们GenerateMap方法里MapDisplay display三种drawMode方式判断和执行，算是一个单独的方法，我们为了今后不断扩充的系统考虑，将方法细分独立出来，目前考虑将这三种生成渲染模式放置到Inspector面板方便调试，我们可以在此脚本新建一个方法：

``````````````````````````````````````````````````````````````````````
public void DrawMapInEditor（）{
复制所有Display代码到这里
``````````````````````````````````````````````````````````````````````

接下来，我们需要从GenerateMap方法中调用相应的Map数据，之前我们display这块代码和地图信息数组在同一个方法里，是可以直接调取GenerateNoiseMap里面这些地图数据的，现在分家了，在其他方法里调用另一个方法里的数据，是需要一个载体存储对应数据，再调用载体，读取数据，这也是基本的编程思想
于是我们在脚本最后新建地图数据结构体：

`Ctrl+.`或者 `Alt+Enter`，快捷键构建结构体内部数据，勾选刚才新建的两个数据类型，然后确定
就可以快速初始化了，//(如果后期不需要修改地图数据，可以将结构体内部所有元素加入readonly关键词)
接下来我们在GenerateMap方法中返回MapData类型数据，void改成MapData
同时别忘记在方法里，最后返回对应数据类型：

``````````````````````````````````````````````
return new MapData（noiseMap，colourMap）;
``````````````````````````````````````````````

这样，我们就可以通过MapData载体，在我们的DrawMapInEditor方法中调取需要的地图类型和对应数据了，在DrawMapInEditor方法里，开头申明赋值，准备调用：

```````````````````````````````````
MapData mapData=GenerateMap（）;
```````````````````````````````````

然后我们将noiseMap，colourMap修正为现在的 `mapData.heightMap`,`mapData.colourMap`，结构体内对应map类型，就可以进行绘制渲染了
如果之前没有手动换行的话，一个快捷键组合：`Ctrl+E+W`，让系统自动换行，避免页面外的信息遗漏，忘记修改
这么修改后，我们的GenerateMap就单独负责地图信息生成了，而与外部交流沟通数据，就交给我们新建的DrawMapInEditor方法了，于是我们可以考虑将 `public MapData GenerateMap`方法改为private，因为暂时不需要用来外部类调用它了，去掉public关键词即可，默认就是private了
为了更精准描述方法定位，修改方法名为：`GenerateMapData()`,快捷键 `ctrl+r+r`；
保存后回到unity，应该会出现一些报错，涉及到其他脚本调用，我们需要进去修改对应的调用，对接到DrawMapInEditor方法
原来是MapGeneratorEditor脚本，修改 `mapGen.GenerateMap()`方法为：
`mapGen.DrawMapInEditor()`,就ok了
好了，折腾这么多，我们终于将MapGenerator内部方法具体拆分，以便接下来将我们的MapGenerator和EndlessTerrain统筹分工，通过协作多线程完成多块地形同步生成，
下面的内容是我们整个无限地形模块重中之重，我会详细用图示解释清楚：
![地图生成器和无限地形生成脚本间多线程协作基本原理.png](https://omo.moe/usr/uploads/2018/12/3127104849.png)
首先，我们的EndlessTerrain脚本，需要获取MapGenerator里面的MapData，meshData各种数据，然而我们的MapGenerator里面是需要通过多个帧数运算才会生成相应的数据，那么我们从EndlessTerrain脚本发生请求，肯定不能立马收到MapGenerator传回的地图数据，于是，我们在调用MapGenerator脚本中请求地图数据方法的时候，为该方法自带传入一个Action请求处理完毕后传回callback数据：

``````````````````````````````````````````````````````````````````````````````````````````````````````
void RequestMapData（Action<MapData>callback){
//在此方法中，开始启动MapData处理线程
}
``````````````````````````````````````````````````````````````````````````````````````````````````````

意味着MapGenerator外部EndlessTerrain之类的脚本调用请求后，我执行完毕数据生成后，会callback发送返回地图数据，这个Action传递MapData信息给外部脚本
好的，我们回到EndlessTerrain脚本，在申请调用MapGenerator地图生成方法的时候，应该传入一个接收地图数据时候需要执行的方法，方法名可以叫做OnMapDataReceived，当RequestMapData方法执行完毕后，收到Callback的数据后，也就是接收地图数据后，调用执行此OnMapDataReceived方法，对数据进行处理：

``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
void start（）{
	RequestMapData（OnMapDataReceived）；
	}
	void OnMapDataReceived（mapData mapData）{
	//在这里处理mapData地图信息
	}
``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

这样，我们传回MapData行为，callback回到我们EndlessTerrain后，就可以调用咱们的OnMapDataReceived方法，开始对传出来的地图数据在此方法里进行处理了
即MapGenerator中RequestMapData方法自带callback 行为，一旦被外部请求调用，必定会自动传出数据，配合EndlessTerrain外部脚本调用该方法的时候指定传入OnMapDataReceived方法，以便对传回数据进行处理，这样就做到了脚本间线程间基本交互实现。
接下来，我们需要关注下MapGenerator这个副线程处理逻辑，当我们void RequestMapdata方法启动我们的MapData处理线程：

```
void MapDataThread（Action<MapData.callback){
//在此线程先运算得到mapData
//这里是重点，我们知道，直接进行mesh网格渲染，需要用到unity内部组件，而unity本质上没有多线程处理这些unity内部操作的，我们不能在c#这些副线程里直接处理渲染，所以需要添加存储mapData，然后传回到等待队列，因为有多个副线程同时在处理各个区块地形数据，EndlessTerrain脚本不可能随时同时接收完毕所有副线程处理出来的地图数据，所以我们先存储到传回队列，排好队。
```
接下来，副线程在Update方法里，执行队列位置计算，在队列中按顺序一个个发送callback传回mapData：

````````````````````````````````````````````````````````````````````````````````````````````
void  Update（）{
	if（queue.Count>0{
	//调用callback指令，传出mapData数据
	}
}
````````````````````````````````````````````````````````````````````````````````````````````

这就是我们的多线程相互协作的基本原理，接下来我们开始逐步实现，这些基本框架第一次接触可能觉得代码量很大，不过没关系，所有多线程基础框架都可以按类似的逻辑构建
来到MapGenerator脚本，我们通用的多线程调用基础，先引入对应命名空间下方法类型：

````````````````````````````````````````````````````````````````````````````````````````````````````````````
using System；//获得Actions各种行为操作调用功能
using System.Threading;//使用多线程功能
````````````````````````````````````````````````````````````````````````````````````````````````````````````

接下来，按着我们刚才的分析，开始第一步，构建我们的RequestMapData方法，附带Action，callback此Action，附带传回Action参数为MapData类型数据：

````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
public void RequestMapData(Action<MapData> callback）{
//请求生成对应副线程执行地图数据处理，我们稍后书写。
}
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

方法内部功能稍后构建，我们接下来构建此方法将调用的启动MapData运算副线程：

``````````````````````````````````````````````````````````
void MapDataThread(Action<MapData> callback)
    {

}
``````````````````````````````````````````````````````````

这样，我们就可以在RequestMapData方法开始构建启动计算副线程功能了：

```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
ThreadStart threadStart = delegate
	        {
	            MapDataThread(callback);
	        };
	//启动线程，委托给带参函数MapDataThread，记住这是一个语句，不是什么方法也不是类，一定要在语句结束后加上分号，新手最容易以为大括号代表结构和类，后面漏掉分号
```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

咱们的方法是外面这个大括号，RequestMapData才是我们的方法结构，第一句话委托给指定线程处理指定方法，接下来写第二句别忘了启动对应线程：

````````````````````````````````````````````````````````````````````````````````
new Thread (threadStart).Start();//调用线程类型下的Start（）方法，
````````````````````````````````````````````````````````````````````````````````

ok，现在我们MapDataThread方法就可以运行在另一个线程里了，我们实现下 `void MapDataThread`方法里具体的线程内部功能：
`MapData mapData=GenerateMapData();`//请务必记住，副线程里直接调用的方法，只能是独立于Unity功能的方法，例如：
`FindObjectOfType`,`GameObject.Find`,`SendMessage`,`StartCoroutine`等等方法，是Unity内部组件API等接口所含的功能，这些方法不能直接调用，否则会报错
我们再回顾下刚才的【地图生成器和无限地形生成脚本间多线程协作基本原理】图示，地图数据处理，我们直接调用对应方法，一句话就轻松实现了，接下来需要创建一个结构体，存储我们的地图数据，方便等会扔到队列里，存进去按顺序一个个传回去
我们在MapGenerator类里面，最后添加一个结构体：

```````````````````````````````````````````````````````````````````````````
struct MapThreadInfo<T> {
	public Action<T> callback;
	public T parameter;
```````````````````````````````````````````````````````````````````````````

`Ctrl+.`或者 `Alt+Enter`快速重构勾选两个变量，快速构建结构体初始化
由于这个结构体我们不需要对其进行改变，作为存储容器，保持其固定不变，建议对所有元素加入readonly关键字，类似于刚才构建的MapData结构体，内部元素都可以加上readonly关键词
接下来，为了调用队列Queue方法，我们需要引用新的命名空间：

`````````````````````````````````
using Systemcollections.Generic;
`````````````````````````````````

List ,Array,Dictionary这些数据集合也是在这个破容器空间里面的
我们在当前MapGenerator类里面，开头申明一个Queue并初始化：

```````````````````````````````````````````````````````````````````````````````````````````
Queue<MapThreadInfo<MapData>> mapDataThreadInfoQueue= new Queue<MapThreadInfo<MapData>>();
```````````````````````````````````````````````````````````````````````````````````````````

接下来，我们就可以在MapDataThread里面安排上了

``````````````````````````````````````````````````````````````````````````````
mapDataThreadInfoQueue.Enqueue(new MapThreadInfo<MapData>(callback,mapData));
``````````````````````````````````````````````````````````````````````````````

使用enqueue方法将新运算出来的地图数据和callback指令都传入队列，方便之后从队列调取传回mapData数据到外部脚本EndlessTerrain。
这里由于是在副线程运行的，地图数据可以被多个线程同时访问，为了保证单张地图数据完整性，这里加上lock锁定此队列

`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
lock （MapDataThreadInfoQueue）{
	mapDataThreadInfoQueue.Enqueue(new MapTheradInfo<MapData>(callback,mapData));
	}
`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

lock代表一旦有一条线程获取到此代码，其他线程就无法访问该代码了，直到代码运算完成释放
接下来我们实现最后一步，在Update方法里，判断queue队列里面的排队信息，如果存在队列元素，遍历内部存储的所有队员，一个个**`callback`**传送出去，同时将该队员元素从等待队列中移除：

````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
void Update() {
        if (mapDataThreadInfoQueue.Count > 0)
        {
            for (int i = 0; i < mapDataThreadInfoQueue.Count;i ++)
            {
                MapThreadInfo<MapData> threadInfo = mapDataThreadInfoQueue.Dequeue();
                threadInfo.callback(threadInfo.parameter);
            }
        }
    }
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

我们MapGenerator这边请求地图数据方法，启动多线程地图数据运算线程功能，计算好后存储数据到结构体，并且加入队列，然后Update方法将队列元素一个个传出，这些都已经实现，现在来到EndlessTerrain脚本看看如何接收数据：
首先我们要调用MapGenerator脚本下的方法，自然要先申明一个对应的MapGenerator：

``````````````````````````````````
static MapGenerator mapGenerator;
``````````````````````````````````

Start（）方法中实例化对应地图生成器：

```````````````````````````````````````````````
MapGenerator=FindObjectOfType<MapGenerator>();
```````````````````````````````````````````````

好了，开始构建我们EndlessTerrain脚本多线程配合方法：TerrainBlock类里面，新增方法

``````````````````````````````````````````````
void OnMapDataReceived（MapData mapData）{}
``````````````````````````````````````````````

对了，别忘记先调用下MapGenerator脚本里面的请求地图数据脚本，先得请求那边执行下，我们在TerrainBlock类里，构造TerrainBlock内容里，最后加上一个获取地图数据请求：

````````````````````````````````````````````````
mapGenerator.RequestMapData(OnMapDataReceived);
````````````````````````````````````````````````

嗯，这样就可以让那边多线程处理数据了，再收到那边队列传过来的mapData，我们就可以在OnMapDataReceived方法进行接收处理了，我们继续编辑OnMapDataReceived方法，先做个测试输出：

``````
print("地图数据已接收");
``````

先打印下，检测传递是否起效
果然，出现25条信息，说明ok了，我们中间9宫格9块，加上外围16块地图，总共25块都已经运算完毕并且通信传回了，查看MapGenerator物体，下方对应生成了25个plane，说明ok，非常不错
这里为啥只传回地图数据而不是同时传回mesh数据呢？因为我们接下来要在这里做LOD系统，得先对地图分块进行筛选，等会单独构建OnMeshDataReceived方法，对远处的地图直接绘制低精度mesh，这样节省资源占用，最后将不同精度mesh单独处理匹配生成完毕，再传入后续脚本进行渲染mesh
好了，我们继续

**- 新目标：Mesh网格数据生成**

由于已经拿到地图数据了，之前做为演示用的 `meshObject=GameObject.CreatPrimitive`初始模型plane已经失去测试意义了，修改为：

````````````````````````````
meshObject = new GameObject("Terrain Block");//创建mesh网格模型Terrain Block
````````````````````````````

同时修改下注释
我们还需要对其赋予mesh Filter和mesh Renderer组件，构建mesh网格需要：
TerrainBlock类里面，开头加上两个变量：

``````````````````````````````````````````````````
MeshRenderer meshRenderer;
MeshFilter meshFilter;
``````````````````````````````````````````````````

接下来为刚才的新物体添加对应mesh存储器和渲染器：

```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
meshRenderer =meshObject.AddComponent<MeshRenderer>();
meshFilter = meshObject.AddComponent<MeshFilter>();
mesh组件都构建完毕，我们可以开始实现OnMeshDataReceived方法第一个功能了，为我们的物体构建基本mesh信息：
void OnMeshDataReceived(MeshData meshData){
	meshFilter.mesh=meshData.CreateMesh();
	}
```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

我们再次回到MapGenerator脚本，这里面我们需要按着RequestMapData方法，做一个类似的请求meshData的方法，偷懒的话全部可以复制MapData的流程改改字母：

1. 一，申明新队列

```
   Queue<MapThreadInfo<MeshData>> meshDataTheradInfoQueue= new Queue<MapThreadInfo<MeshData>>();
```

2.创建新的请求meshData方法

````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
public void RequestMeshData(MapData mapData, Action<MeshData>callback){
    ThreadStart threadStart = delegate {
        MeshDataThread(mapData, callback);
    };
    new Thread(threadStart).Start();
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

3. 开启新的meshData计算线程

```
   void MeshDataThread(MapData mapData, Action<MeshData> callback)
   {
   MeshData meshData = MeshGenerator.GenerateTerrainMesh(mapData.heightMap, meshHeightMultiplier, meshHeightCurve, levelOfDetail);
   lock (meshDataThreadInfoQueue)
   {
   meshDataThreadInfoQueue.Enqueue(new MapThreadInfo<MeshData>(callback, meshData));
   }
}
```
4. 然后在UpDate方法里也跟着抄一遍MapDataQueue传出队列遍历：

```
   if (meshDataThreadInfoQueue.Count > 0){
   for (int i = 0; i < meshDataThreadInfoQueue.Count; ++)
   {
   MapThreadInfo<MeshData> threadInfo = meshDataThreadInfoQueue.Dequeue();
   threadInfo.callback(threadInfo.parameter);
   }
```

好了，终于复制粘贴完毕了，
我们回到Endless Terrain脚本，接收到MapData后，我们再次请求对应的meshData
对我们的OnMapDataReceived方法，之前的print测试语句删掉，改成：

``````````````````````````````````````````````````````````
mapGenerator.RequestMeshData(mapData,OnMeshDataReceived);
``````````````````````````````````````````````````````````

由于我们meshData也拿到了，之前TerrainBlock类下的plane对应的mesh localScale尺寸设定也可以去掉了：

````````````````````````````````````````````````````````````````````````````
 meshObject.transform.localScale = Vector3.one * size / 10f;删除此句。
````````````````````````````````````````````````````````````````````````````

然后我们需要对TerrainBlock构造体传入新参Material materal，终于可以对咱们的地图数据和mesh数据进行材质渲染了

**- 新目标：texture材质渲染**

TerrainBlock构造传入新参：

``````````````````
Material material
``````````````````

结构内部添加材质信息：

````````````````````````````````
meshRenderer.material=material;
````````````````````````````````

然后
同时别忘了在EndlessTerrain类里面，开头申明对应材质变量：

```````````````````````````````
public Material mapMaterial；
```````````````````````````````

再找找下面的UpdateVisibleBlocks方法，别忘了循环遍历判断生成符合要求的新block时候，也需要传入地图材质，对新创建的block添加材质信息：

``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
else{
	terrainBlockDictionary.Add(ViewdBlockCoordinate,new TerrainBlock(viewedBlockCoordinate,blockSize,transfrom,mapMaterial));//在这里添加材质参数
``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

保存，回到unity，点击MapGenerator物体，然后查看我们Inspector面板，Endless脚本上需要挂载下我们的Map Material，点击assets文件夹下的Materials文件夹，里面之前创建的MeshMat就是了，拖拽上去，ok，运行
查看生成的地形，似乎比较诡异
导致这些诡异的地形生成的原因，应该是在MapGenerator脚本，执行RequestMeshData的时候，调用多线程：MapDataThread获取 `MeshData meshData = MeshGenerator.GenerateTerrainMesh`时，我们MeshGenerator脚本里，查看这个GenerateTerrainMesh静态方法里面，heightCurve在顶点生成的时候，`heightCurve.Evaluate`方法，被多个线程同时访问处理，最后evaluate方法运算数据发生异常
我们可以通过Lock指令，对meshData.vertices生成语句的heightCurve曲线进行锁定改为：

``````````````````````````````````````````````````````````````
lock （heightCurve）{
meshData.vertices[vertexIndex]=…..}
``````````````````````````````````````````````````````````````

保存后unity运行，移动一下viewer，发现生成的地形正常了
但是我们认真考虑后没有采用此方法，为什么？
因为一旦我们锁定顶点运算方法，其他线程就得乖乖躺着等一个个线程运算顶点数据，这意味着咱们二十五块mesh差不多变成单线程处理mesh信息了，辛辛苦苦弄的多线程失去了意义，地形生成速度会大大降低
于是我们思考一下，现在是大家都抢着访问传入的一个曲线，研究他，解析它，读取曲线的数值，利用数值来进行顶点运算，我们完全可以实例化一个曲线，让该曲线 的值等于传入的曲线参数的值，有了一个实例化的载体，大家就可以愉悦地同时查阅该曲线值了，而不是把传入的参数来回抢夺，造成这种问题的原理，目前我的能力无法解决，希望有大佬可以指点下，好了，我们继续修复：
MeshGenerator脚本的GenerateTerrainMesh方法里，我们在开头新建一个曲线：

```````````````````````````````````````````````````````````````````````
AnimationCurve heightCurve =new AnimationCurve(basedHeightCurve.keys);
```````````````````````````````````````````````````````````````````````

我们考虑命名重复问题，将之前GenerateTerrainMesh方法传入的heightCurve和这里要赋值的传入参数全改成basedHeightCurve，这样后面生成顶点时读取的曲线数值，就从这个实例化的curve中获取了，可以支持多线程同时访问，保存后执行，发现获取速度快了很多，效果也ok
目前来说，我们生成的这些破玩意，都是一模一样的mesh地形，接下来，我们将添加材质，生成连续不同地形，以及LOD细节划分等等，更多内容，我们下节再见了
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[2]: https://omo.moe/usr/uploads/2018/12/3127104849.png

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【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建第九节：多线程同步协调处理多区块思想和基本实现

plumn • 2018 年 12 月 26 日

第九节 多线程同步协调处理多区块思想和基本实现

---

``````````````````````````````````````````````
return new MapData（noiseMap，colourMap）;
``````````````````````````````````````````````

这样，我们就可以通过MapData载体，在我们的DrawMapInEditor方法中调取需要的地图类型和对应数据了，在DrawMapInEditor方法里，开头申明赋值，准备调用：

```````````````````````````````````
MapData mapData=GenerateMap（）;
```````````````````````````````````

``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
void start（）{
	RequestMapData（OnMapDataReceived）；
	}
	void OnMapDataReceived（mapData mapData）{
	//在这里处理mapData地图信息
	}
``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

接下来，按着我们刚才的分析，开始第一步，构建我们的RequestMapData方法，附带Action，callback此Action，附带传回Action参数为MapData类型数据：

方法内部功能稍后构建，我们接下来构建此方法将调用的启动MapData运算副线程：

``````````````````````````````````````````````````````````
void MapDataThread(Action<MapData> callback)
    {

}
``````````````````````````````````````````````````````````

这样，我们就可以在RequestMapData方法开始构建启动计算副线程功能了：

```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
ThreadStart threadStart = delegate
	        {
	            MapDataThread(callback);
	        };
	//启动线程，委托给带参函数MapDataThread，记住这是一个语句，不是什么方法也不是类，一定要在语句结束后加上分号，新手最容易以为大括号代表结构和类，后面漏掉分号
```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

咱们的方法是外面这个大括号，RequestMapData才是我们的方法结构，第一句话委托给指定线程处理指定方法，接下来写第二句别忘了启动对应线程：

`````````````````````````````````
using Systemcollections.Generic;
`````````````````````````````````

List ,Array,Dictionary这些数据集合也是在这个破容器空间里面的
我们在当前MapGenerator类里面，开头申明一个Queue并初始化：

接下来，我们就可以在MapDataThread里面安排上了

````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
void Update() {
        if (mapDataThreadInfoQueue.Count > 0)
        {
            for (int i = 0; i < mapDataThreadInfoQueue.Count;i ++)
            {
                MapThreadInfo<MapData> threadInfo = mapDataThreadInfoQueue.Dequeue();
                threadInfo.callback(threadInfo.parameter);
            }
        }
    }
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

``````````````````````````````````
static MapGenerator mapGenerator;
``````````````````````````````````

Start（）方法中实例化对应地图生成器：

```````````````````````````````````````````````
MapGenerator=FindObjectOfType<MapGenerator>();
```````````````````````````````````````````````

好了，开始构建我们EndlessTerrain脚本多线程配合方法：TerrainBlock类里面，新增方法

``````````````````````````````````````````````
void OnMapDataReceived（MapData mapData）{}
``````````````````````````````````````````````

````````````````````````````````````````````````
mapGenerator.RequestMapData(OnMapDataReceived);
````````````````````````````````````````````````

``````
print("地图数据已接收");
``````

**- 新目标：Mesh网格数据生成**

由于已经拿到地图数据了，之前做为演示用的 `meshObject=GameObject.CreatPrimitive`初始模型plane已经失去测试意义了，修改为：

````````````````````````````
meshObject = new GameObject("Terrain Block");//创建mesh网格模型Terrain Block
````````````````````````````

同时修改下注释
我们还需要对其赋予mesh Filter和mesh Renderer组件，构建mesh网格需要：
TerrainBlock类里面，开头加上两个变量：

``````````````````````````````````````````````````
MeshRenderer meshRenderer;
MeshFilter meshFilter;
``````````````````````````````````````````````````

接下来为刚才的新物体添加对应mesh存储器和渲染器：

```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
meshRenderer =meshObject.AddComponent<MeshRenderer>();
meshFilter = meshObject.AddComponent<MeshFilter>();
mesh组件都构建完毕，我们可以开始实现OnMeshDataReceived方法第一个功能了，为我们的物体构建基本mesh信息：
void OnMeshDataReceived(MeshData meshData){
	meshFilter.mesh=meshData.CreateMesh();
	}
```````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

我们再次回到MapGenerator脚本，这里面我们需要按着RequestMapData方法，做一个类似的请求meshData的方法，偷懒的话全部可以复制MapData的流程改改字母：

1. 一，申明新队列

```
   Queue<MapThreadInfo<MeshData>> meshDataTheradInfoQueue= new Queue<MapThreadInfo<MeshData>>();
```

2.创建新的请求meshData方法

````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
public void RequestMeshData(MapData mapData, Action<MeshData>callback){
    ThreadStart threadStart = delegate {
        MeshDataThread(mapData, callback);
    };
    new Thread(threadStart).Start();
````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

3. 开启新的meshData计算线程

``````````````````````````````````````````````````````````
mapGenerator.RequestMeshData(mapData,OnMeshDataReceived);
``````````````````````````````````````````````````````````

由于我们meshData也拿到了，之前TerrainBlock类下的plane对应的mesh localScale尺寸设定也可以去掉了：

然后我们需要对TerrainBlock构造体传入新参Material materal，终于可以对咱们的地图数据和mesh数据进行材质渲染了

**- 新目标：texture材质渲染**

TerrainBlock构造传入新参：

``````````````````
Material material
``````````````````

结构内部添加材质信息：

````````````````````````````````
meshRenderer.material=material;
````````````````````````````````

然后
同时别忘了在EndlessTerrain类里面，开头申明对应材质变量：

```````````````````````````````
public Material mapMaterial；
```````````````````````````````

再找找下面的UpdateVisibleBlocks方法，别忘了循环遍历判断生成符合要求的新block时候，也需要传入地图材质，对新创建的block添加材质信息：

``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
else{
	terrainBlockDictionary.Add(ViewdBlockCoordinate,new TerrainBlock(viewedBlockCoordinate,blockSize,transfrom,mapMaterial));//在这里添加材质参数
``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````

``````````````````````````````````````````````````````````````
lock （heightCurve）{
meshData.vertices[vertexIndex]=…..}
``````````````````````````````````````````````````````````````

[1]: https://omo.moe/usr/uploads/2018/12/395102909.jpg
[2]: https://omo.moe/usr/uploads/2018/12/3127104849.png

【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建第九节：多线程同步协调处理多区块思想和基本实现

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【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建第九节：多线程同步协调处理多区块思想和基本实现

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【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建 第九节：多线程同步协调处理多区块思想和基本实现

【Unity 3D进阶教程分享】EndlessTerrain无限地形搭建第九节：多线程同步协调处理多区块思想和基本实现