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+# 项目1，北京市科委研发项目
+需要在虚幻里访问api获得模型文件(fbx模型 png贴图)和场景描述(json) 在runtime下加载后，用于扣绿虚拍系统
+
+# 项目2，国家数字资产平台
+根据访问需求，接通云游戏(使用蔚领云游戏SDK)，然后收到前端的资产uuid，加载资产渲染。
+
+## 第一阶段
+用户访问一个web平台，点击某个资产(模型or场景)
+会弹出一个页面，页面类似虚幻metahuman编辑器一样，是视频流的形式
+
+在视频流中，是一个runtime窗口，可以渲染目标资产
+
+## 第二阶段
+可以在前端点击资产添加，runtime窗口里会添加资产，然后runtime窗口里有简单编辑器可以摆镜头，可以简单摆放资产
+
+# Default材质
+标准pbr(半透明)
+提供参数
+1. base color (tex)
+2. basecolor tilt (v3) 乘basevolor
+4. opacity(tex linear)
+5. opacity power(scale)乘到opacity
+6. roughness(tex linear color)
+7. roughness tilt(scale) 乘roughness
+8. metalic (tex linear color)
+9. metalic tilt(scale)
+10. ao (tex linear color)
+11. emisive(tex)
+12. emisive power(scale) 乘emisive
+13. normal(tex)
+
+
+# FaceSet
+https://github.com/zenustech/zeno/blob/b4ed8740810f20cf0612d615d9505468b2d2a4d1/projects/FBX/FBXSDK.cpp#L477
+
+```c++
+int mat_count = 0;
+if (pMesh->GetElementMaterialCount() > 0) {
+	for (auto i = 0; i < numPolygons; ++i) {
+		faceset[i] = pMesh->GetElementMaterial()->GetIndexArray().GetAt(i);
+	}
+	mat_count = pNode->GetMaterialCount();
+	for (auto i = 0; i < mat_count; i++) {
+		FbxSurfaceMaterial* material = pNode->GetMaterial(i);
+		ud.set2(format("faceset_{}", i), material->GetName());
+	}
+}
+```
+
+UE中相关逻辑位于FbxMesh.cpp
+```c++
+void ExtractMeshMaterials(FFbxParser& Parser, FbxMesh* Mesh, FbxNode* MeshNode, TFunction<void(const FString& MaterialName, const FString& MaterialUid, const int32 MeshMaterialIndex)> CollectMaterial)
+	{
+		if (!Mesh || !MeshNode)
+		{
+			return;
+		}
+
+		//Grab all Material indexes use by the mesh
+		TArray<int32> MaterialIndexes;
+		int32 PolygonCount = Mesh->GetPolygonCount();
+		if (FbxGeometryElementMaterial* GeometryElementMaterial = Mesh->GetElementMaterial())
+		{
+			FbxLayerElementArrayTemplate<int32>& IndexArray = GeometryElementMaterial->GetIndexArray();
+			switch (GeometryElementMaterial->GetMappingMode())
+			{
+			case FbxGeometryElement::eByPolygon:
+			{
+				if (IndexArray.GetCount() == PolygonCount)
+				{
+					for (int32 PolygonIndex = 0; PolygonIndex < PolygonCount; ++PolygonIndex)
+					{
+						MaterialIndexes.AddUnique(IndexArray.GetAt(PolygonIndex));
+					}
+				}
+			}
+			break;
+
+			case FbxGeometryElement::eAllSame:
+			{
+				if (IndexArray.GetCount() > 0)
+				{
+					MaterialIndexes.AddUnique(IndexArray.GetAt(0));
+				}
+			}
+			break;
+			}
+		}
+		const int32 MaterialCount = MeshNode->GetMaterialCount();
+		TMap<FbxSurfaceMaterial*, int32> UniqueSlotNames;
+		UniqueSlotNames.Reserve(MaterialCount);
+		bool bAddAllNodeMaterials = (MaterialIndexes.Num() == 0);
+		for (int32 MaterialIndex = 0; MaterialIndex < MaterialCount; ++MaterialIndex)
+		{
+			if (FbxSurfaceMaterial* FbxMaterial = MeshNode->GetMaterial(MaterialIndex))
+			{
+				int32& SlotMaterialCount = UniqueSlotNames.FindOrAdd(FbxMaterial);
+				FString MaterialName = Parser.GetFbxHelper()->GetFbxObjectName(FbxMaterial);
+				FString MaterialUid = TEXT("\\Material\\") + MaterialName;
+				if (bAddAllNodeMaterials || MaterialIndexes.Contains(MaterialIndex))
+				{
+					if (SlotMaterialCount > 0)
+					{
+						MaterialName += TEXT("_Section") + FString::FromInt(SlotMaterialCount);
+					}
+					SlotMaterialCount++;
+					CollectMaterial(MaterialName, MaterialUid, MaterialIndex);
+				}
+			}
+		}
+	}
+```
+
+
+# 
+AFBXMeshActor::AddMesh
+
+
+UFBXSceneImporter::ImportFBX()
+=>
+UFBXSceneImporter::ProcessNode()
+=>
+UFBXSceneImporter::ProcessMesh()
+=>
+UFBXSceneImporter::CreateNodeMaterials()
+=>
+FBXImportSettings->GetMaterialProperties(FbxMaterial, Node->GetName());
+
+## FaceSet
+FbxGeometryElementMaterial* GetElementMaterial
+
+FbxGeometryElementMaterial(FbxLayerElementMaterial)，