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03-UnrealEngine/卡通渲染相关资料/演讲笔记/VRM4U/VRM4U中资源带入逻辑与Assimp的使用.md

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+## 自定义Asset
+https://zhuanlan.zhihu.com/p/77812246
+
+- FAssetTypeActions_Base：是对已经创建好的资源操作函数的封装。这个资源在内容浏览器中的颜色，类型名字，显示的缩略图。
+- UFactory：这个是创建自定义类型文件的入口。以及创建资源的二级菜单。
+- UBlueprint: 创建继承类，来实现一个新的视图编辑窗口
+- UXXXX : Public Object ： 这里面存储我们要编辑的数据
+
+VRM中对应类为：
+- FAssetTypeActions_VrmAssetList、UVrmAssetListThumbnailRenderer
+- UVRM4UImporterFactory
+- UVrmAssetListObject
+
+## Assimp
+资源工厂类中：UVRM4UImporterFactory::FactoryCreateBinary
+```
+{
+	const UVrmRuntimeSettings* Settings = GetDefault<UVrmRuntimeSettings>();
+
+	{
+		FSoftObjectPath r = Settings->AssetListObject; //(TEXT("/VRM4U/VrmObjectListBP.VrmObjectListBP"));
+		UObject *u = r.TryLoad();
+		if (u) {
+			if (Cast<UBlueprint>(u)) {
+				c = (UClass*)(Cast<UBlueprint>(u)->GeneratedClass);
+			}
+		}
+	}
+
+	if (c == nullptr) {
+		FSoftObjectPath r(TEXT("/VRM4U/VrmAssetListObjectBP.VrmAssetListObjectBP"));
+		UObject *u = r.TryLoad();
+		if (u) {
+			c = (UClass*)(Cast<UBlueprint>(u)->GeneratedClass);
+		}
+	}
+
+	if (c == nullptr) {
+		c = UVrmAssetListObject::StaticClass();
+	}
+
+	m = NewObject<UVrmAssetListObject>((UObject*)GetTransientPackage(), c.Get());
+}
+
+UVrmAssetListObject* mret = nullptr;
+if (m) {
+	//auto a = NewObject<UVrmAssetListObject>(MatClass.Object, NAME_None, RF_Transactional);
+	//MatClass.Object; 
+	//ULoaderBPFunctionLibrary::LoadVRMFile(nullptr, fullFileName);
+
+	GWarn->BeginSlowTask( NSLOCTEXT("UnrealEd", "ImportVRM", "Importing VRM"), true );
+
+	int ret = true;
+	auto &g = VRMConverter::Options::Get();
+	g.SetVrmOption(ImportUI->GenerateOptionData());
+
+	ULoaderBPFunctionLibrary::SetImportMode(true, Cast<UPackage>(InParent));
+	{
+		ret = ULoaderBPFunctionLibrary::LoadVRMFileLocal(m.Get(), mret, fullFileName);
+	}
+}
+```
+
+
+
+
+
+蓝图函数库中：bool ULoaderBPFunctionLibrary::LoadVRMFileFromMemory()。
+```
+Assimp::Importer mImporter;
+const aiScene* mScenePtr = nullptr; // delete by Assimp::Importer::~Importer
+
+mScenePtr = mImporter.ReadFileFromMemory(pFileDataData, dataSize,
+	aiProcess_Triangulate | aiProcess_MakeLeftHanded | aiProcess_CalcTangentSpace | aiProcess_GenSmoothNormals | aiProcess_OptimizeMeshes,
+	e.c_str());
+
+if (mScenePtr == nullptr) {
+	std::string file;
+	file = utf_16_to_shift_jis(*filepath);
+
+	mScenePtr = mImporter.ReadFile(file, aiProcess_Triangulate | aiProcess_MakeLeftHanded | aiProcess_CalcTangentSpace | aiProcess_GenSmoothNormals | aiProcess_OptimizeMeshes);
+}
+```