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03-UnrealEngine/Editor/FBXAnimation导入逻辑.md

@@ -5,6 +5,101 @@ excerpt:
 tags: 
 rating: ⭐
 ---
+# BVHImport插件中的案例
+```c++
+UObject* UBVHImportFactory::FactoryCreateFile(UClass* InClass, UObject* InParent, FName InName, EObjectFlags Flags, const FString& FileName, const TCHAR* Parms, FFeedbackContext* Warn, bool& bOutOperationCanceled)
+{
+	if (!shouldImport) {
+		return nullptr;
+	}
+	bool fileSuccess = BVHFile.ImportData(TCHAR_TO_ANSI(*FileName));
+	
+	const bool bIsUnattended = (IsAutomatedImport()
+		|| FApp::IsUnattended()
+		|| IsRunningCommandlet()
+		|| GIsRunningUnattendedScript);
+
+	// Check if it's a re-import
+	if (InParent != nullptr)
+	{
+		UObject* ExistingObject = StaticFindObject(UObject::StaticClass(), InParent, *InName.ToString());
+		if (ExistingObject)
+		{
+			//reimport逻辑略
+		}
+	}
+	
+	if (fileSuccess)
+	{	
+		UAnimSequence* AnimSequence = NewObject<UAnimSequence>(InParent, InName, Flags & ~EObjectFlags::RF_Transactional);
+		if (Skeleton == NULL) {
+			//创建骨骼资产略
+		}
+		else {
+			AnimSequence->SetSkeleton(Skeleton);//Skeleton bvhSkel
+			AnimSequence->SetPreviewMesh(PreviewMesh);			
+		}
+		ExtractAnimDataFromBVHFile(AnimSequence);
+		return AnimSequence;
+		
+	}
+	return nullptr;
+	
+}
+```
+
+```c++
+void UBVHImportFactory::ExtractAnimDataFromBVHFile(UAnimSequence* AnimSequence) {
+	if (AnimSequence)
+	{		
+		// create animation		
+		IAnimationDataController& Controller = AnimSequence->GetController();
+		Controller.OpenBracket(LOCTEXT("ImportBVHAnimation", "Importing BVH Animation"));
+		Controller.ResetModel();
+
+		// Write animation data into animation sequence.
+		// Extract transform of hip to create root motion.
+		const FReferenceSkeleton& RefSkeleton = AnimSequence->GetSkeleton()->GetReferenceSkeleton();
+		const FName RootName = RefSkeleton.GetBoneName(0);
+		const int32 NumOfKeys = BVHFile.Root->FrameOffset.Num();
+
+		AnimSequence->ImportFileFramerate = (float)BVHFile.Header.DataRate;
+		AnimSequence->ImportResampleFramerate = BVHFile.Header.DataRate;
+
+		Controller.SetPlayLength(float(NumOfKeys - 1) / (float)BVHFile.Header.DataRate);
+		Controller.SetFrameRate(FFrameRate(BVHFile.Header.DataRate, 1));
+		
+		RecursiveReadKeysFromNode(Controller, BVHFile.Root.Get());
+
+		Controller.NotifyPopulated();
+		Controller.CloseBracket();
+
+		AnimSequence->AdditiveAnimType = EAdditiveAnimationType::AAT_None;
+		AnimSequence->PostEditChange();
+		FAssetRegistryModule::AssetCreated(AnimSequence);
+		AnimSequence->MarkPackageDirty();
+	}
+}
+```
+
+```c++
+void UBVHImportFactory::RecursiveReadKeysFromNode(IAnimationDataController& Controller, FNode* Node)
+{
+	if (Node)
+	{
+		Controller.AddBoneTrack(Node->Name,false);
+		Controller.SetBoneTrackKeys(Node->Name, Node->FrameOffset, Node->FrameQuat, Node->FrameScale,false);
+		if (Node->Children.Num() > 0)
+		{
+			for (NodePtr Child : Node->Children)
+			{
+				RecursiveReadKeysFromNode(Controller, Child.Get());
+			}
+		}
+	}
+}
+```
+
 # UAnimSequenceFactory
 ```c++
 UObject* UAnimSequenceFactory::FactoryCreateNew(UClass* Class, UObject* InParent, FName Name, EObjectFlags Flags, UObject* Context, FFeedbackContext* Warn)