# TestMultiSceneLightmap

**Repository Path**: andersonunity/test-multi-scene-lightmap

## Basic Information

- **Project Name**: TestMultiSceneLightmap
- **Description**: No description available
- **Primary Language**: C#
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-01-18
- **Last Updated**: 2021-01-21

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# TestMultiSceneLightmap

#### 介绍

测试加载多个场景时，光照贴图的变化。
资源的打包和加载使用的是Addressable-CN.
加密需要单独编写一个代码BlackholeAESStreamProcessor.cs；这个代码需要在两个工程都放置。

### 问题0

- 使用加密模式后，会出现异常

```Text
ObjectDisposedException: Cannot access a closed Stream.
System.IO.__Error.StreamIsClosed () (at <9577ac7a62ef43179789031239ba8798>:0)
System.IO.MemoryStream.set_Position (System.Int64 value) (at <9577ac7a62ef43179789031239ba8798>:0)
UnityEngine.ResourceManagement.ResourceProviders.AssetBundleResource.GetAssetBundle () (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/ResourceProviders/AssetBundleProvider.cs:252)
UnityEngine.ResourceManagement.ResourceProviders.SceneProvider+SceneOp.Execute () (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/ResourceProviders/SceneProvider.cs:64)
UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationBase`1[TObject].InvokeExecute () (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/AsyncOperations/AsyncOperationBase.cs:466)
UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationBase`1[TObject].<.ctor>b__34_0 (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle o) (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/AsyncOperations/AsyncOperationBase.cs:118)
UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationBase`1+<>c__DisplayClass55_0[TObject].<add_CompletedTypeless>b__0 (UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle`1[TObject] s) (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/AsyncOperations/AsyncOperationBase.cs:309)
DelegateList`1[T].Invoke (T res) (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/Util/DelegateList.cs:69)
UnityEngine.Debug:LogException(Exception)
DelegateList`1:Invoke(AsyncOperationHandle`1) (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/Util/DelegateList.cs:73)
UnityEngine.ResourceManagement.AsyncOperations.<>c__DisplayClass55_0:<add_CompletedTypeless>b__0(AsyncOperationHandle`1)
DelegateList`1:Invoke(AsyncOperationHandle`1) (at Library/PackageCache/com.unity.addressables.cn@1.17.0/Runtime/ResourceManager/Util/DelegateList.cs:69)
UnityEngine.AsyncOperation:InvokeCompletionEvent()

```

- 异常的代码为：


```c#
//AssetBundleProvider.cs
//Line 251, 252

//...
inputStream.Dispose();
inputStream.Position = 0;
//...

```

- 参考网上资料

[C# MemoryStream.Dispose之后，为什么仍可以ToArray()?](https://www.cnblogs.com/wolf-sun/p/3925477.html)

```c#
//set=0之前，会检测stream是否被dispose了，是的话就会触发异常
public override long Position {
	get {
	    CheckIfClosedThrowDisposed ();
	    return position - initialIndex;
	}
	set {
	    CheckIfClosedThrowDisposed ();
	    if (value < 0)
	        throw new ArgumentOutOfRangeException ("value",
	                        "Position cannot be negative" );
	        if (value > Int32.MaxValue)
	            throw new ArgumentOutOfRangeException ("value",
	            "Position must be non-negative and less than 2^31 - 1 - origin");
	        position = initialIndex + (int) value;
    }
}
```

- 将215，252代码调整为，执行正确

```c#
//inputStream.Dispose();
//inputStream.Position = 0;
if(inputStream.CanSeek)
{
    inputStream.Position = 0;
}
inputStream.Dispose();
```

### 问题1

- 如果出现crc或iostream header错误，有可能是之前下载了未加密的资源（在缓存中），而当前又使用了加密后的资源，造成的错误
- 解决方法是，手动清除缓存（即删除缓存文件），问题解决

## 问题2

- 提示没有Visual Studio 2015 C++ Compiler & Win 10 SDK
- 在Visual Stuido Install中将可能与之相关的包都勾选，重试OK