Major refactoring. Putting data loading and management in own class.

Source/ImmersiveAnalytics/DataComponent.cpp

+// Fill out your copyright notice in the Description page of Project Settings.
+
+#include "DataComponent.h"
+#include "Runtime/Core/Public/Misc/Paths.h"
+#include "Runtime/Core/Public/HAL/FileManagerGeneric.h"
+#include "HDF5Library.h"
+#include "Plot3D.h"
+#include "PawnBase.h"
+#include "Runtime/Engine/Classes/Engine/World.h"
+#include "Runtime/Engine/Classes/Kismet/KismetMathLibrary.h"
+#include "Runtime/Core/Public/Async/ParallelFor.h"
+
+UDataComponent::UDataComponent()
+{
+	D3_BrushAlpha = 0;
+	D3_SpriteAlpha = 255;
+	D3_BrushOverridesColor = false;
+	D3_BrushColor = FColor(0, 0, 0, 0);
+	D3_UseTransparency = true;
+	D3_SpriteSizeFactor = 50;
+}
+
+
+// Called when the game starts
+void UDataComponent::BeginPlay()
+{
+	Super::BeginPlay();
+
+	if (!TransferFunction)
+	{
+		UE_LOG(LogTemp, Error, TEXT("No transfer function set!"));
+		FGenericPlatformMisc::RequestExit(false);
+	}
+
+	// Find Files
+	FString Directory = FPaths::ProjectDir();
+	Directory += FString("/Resources/");
+	FString Path = Directory + "*.h5*";
+	FFileManagerGeneric::Get().FindFiles(FileNames, *Path, true, false);
+
+	if (!FileNameToLoadOnStart.IsEmpty())
+	{
+		LoadFile(FileNameToLoadOnStart);
+		LoadStep(GroupNames[0]);
+	}
+}
+
+void UDataComponent::LoadFile(FString FileName)
+{
+	// Load File
+	LoadedFile = UHDF5Library::LoadFile(FileName, GroupNames);
+}
+
+void UDataComponent::LoadStep(FString GroupName)
+{
+	UHDF5Library::LoadGroup(LoadedFile, GroupName, X, Y, Z, U, V, W);
+
+	// Prepare Data
+	Num = X.Num();
+	if (OverrideMaxPointCount > 0 && OverrideMaxPointCount < Num)
+	{
+		Num = OverrideMaxPointCount;
+	}
+
+	IsBrushed = TArray<bool>();
+	IsBrushed.Init(false, Num);
+
+	for (int32 i = 0; i < Num; i++)
+	{
+		Length.Emplace(FVector(U[i], V[i], W[i]).Size());
+	}
+
+	int32 MaxIndex, MinIndex;
+	UKismetMathLibrary::MaxOfFloatArray(Length, MaxIndex, MaxLength);
+	UKismetMathLibrary::MinOfFloatArray(Length, MinIndex, MinLength);
+	UKismetMathLibrary::MaxOfFloatArray(X, MaxIndex, MaxX);
+	UKismetMathLibrary::MinOfFloatArray(X, MinIndex, MinX);
+	UKismetMathLibrary::MaxOfFloatArray(Y, MaxIndex, MaxY);
+	UKismetMathLibrary::MinOfFloatArray(Y, MinIndex, MinY);
+	UKismetMathLibrary::MaxOfFloatArray(Z, MaxIndex, MaxZ);
+	UKismetMathLibrary::MinOfFloatArray(Z, MinIndex, MinZ);
+	UKismetMathLibrary::MaxOfFloatArray(U, MaxIndex, MaxU);
+	UKismetMathLibrary::MinOfFloatArray(U, MinIndex, MinU);
+	UKismetMathLibrary::MaxOfFloatArray(V, MaxIndex, MaxV);
+	UKismetMathLibrary::MinOfFloatArray(V, MinIndex, MinV);
+	UKismetMathLibrary::MaxOfFloatArray(W, MaxIndex, MaxW);
+	UKismetMathLibrary::MinOfFloatArray(W, MinIndex, MinW);
+
+	for (int32 i = 0; i < Num; i++)
+	{
+		FColor TempColor = CalculateColorOfPoint(i, MaxLength, MinLength);
+
+		PColor.Emplace(FVector(TempColor.R, TempColor.G, TempColor.B));
+	}
+
+	// Spawn Plot3D
+	FVector Location(-1610.0f, -341.0f, 100.0f);
+	FRotator Rotation(0.0f, 0.0f, 0.0f);
+	FActorSpawnParameters SpawnInfo;
+	APlot3D* Plot3D = GetWorld()->SpawnActor<APlot3D>(Location, Rotation, SpawnInfo);
+	Cast<APawnBase>(GetOwner())->Plot3D = Plot3D;
+	Plot3D->Init(this);
+}
+
+FColor UDataComponent::CalculateColorOfPoint(int32 Index, float Min, float Max)
+{
+	float NormalizedValue = UKismetMathLibrary::NormalizeToRange(Length[Index], Min, Max);
+	FVector ColorVec = TransferFunction->GetVectorValue(NormalizedValue);
+	FColor Color = FColor((uint8)(ColorVec.X * 255), (uint8)(ColorVec.Y * 255), (uint8)(ColorVec.Z * 255));
+	return Color;
+}
+
+void UDataComponent::AddFilter_Planes(FVector NormalRight, FVector LocationRight, bool UseTwoPlanes, FVector NormalLeft, FVector LocationLeft, bool Add, bool Rebuild, bool Invert)
+{
+	TArray<int32> Indexes = TArray<int32>();
+	Indexes.Init(-1, Num);
+
+	APlot3D* Plot3D = Cast<APawnBase>(GetOwner())->Plot3D;
+	ParallelFor(Num, [this, Invert, &Indexes, LocationRight, LocationLeft, NormalRight, NormalLeft, UseTwoPlanes, Add, Plot3D](int32 CurrIdx)
+	{
+		FVector WorldLoc = Plot3D->CalculateWorldLocOfPoint(CurrIdx);
+		FVector DifferenceRight = WorldLoc - LocationRight;
+		FVector DifferenceLeft = WorldLoc - LocationLeft;
+		float DotRight = UKismetMathLibrary::Dot_VectorVector(DifferenceRight, NormalRight);
+		float DotLeft = UKismetMathLibrary::Dot_VectorVector(DifferenceLeft, NormalLeft);
+
+		if (Invert)
+		{
+			if (DotRight >= 0.f && (DotLeft >= 0.f || !UseTwoPlanes))
+			{
+				Indexes[CurrIdx] = CurrIdx;
+			}
+		}
+		else
+		{
+			if (DotRight <= 0.f && (DotLeft <= 0.f || !UseTwoPlanes))
+			{
+				Indexes[CurrIdx] = CurrIdx;
+			}
+		}
+	});
+
+	BrushPoints(Indexes, Add, Rebuild);
+}
+
+void UDataComponent::AddFilter_ValueRange(EAxisType XType, float XMin, float XMax, EAxisType YType, float YMin, float YMax, bool Add, bool Rebuild, bool UseTwoValues)
+{
+	TArray<float> * XArray = nullptr;
+	TArray<float> * YArray = nullptr;
+	TArray<int32> Indexes = TArray<int32>();
+
+	switch (XType)
+	{
+	case EAxisType::X:
+		XArray = &X;
+		break;
+	case EAxisType::Y:
+		XArray = &Y;
+		break;
+	case EAxisType::Z:
+		XArray = &Z;
+		break;
+	case EAxisType::U:
+		XArray = &U;
+		break;
+	case EAxisType::V:
+		XArray = &V;
+		break;
+	case EAxisType::W:
+		XArray = &W;
+		break;
+	case EAxisType::LengthUVW:
+		XArray = &Length;
+		break;
+	default:
+		break;
+	}
+
+	switch (YType)
+	{
+	case EAxisType::X:
+		YArray = &X;
+		break;
+	case EAxisType::Y:
+		YArray = &Y;
+		break;
+	case EAxisType::Z:
+		YArray = &Z;
+		break;
+	case EAxisType::U:
+		YArray = &U;
+		break;
+	case EAxisType::V:
+		YArray = &V;
+		break;
+	case EAxisType::W:
+		YArray = &W;
+		break;
+	case EAxisType::LengthUVW:
+		YArray = &Length;
+		break;
+	default:
+		break;
+	}
+
+	/*
+	Indexes.Init(-1, Points.Num());
+	ParallelFor(Points.Num(), [this, XArray, YArray, XMin, XMax, YMin, YMax, Add, &Indexes](int32 CurrIdx)
+	{
+		if ((*XArray)[CurrIdx] >= XMin && (*XArray)[CurrIdx] <= XMax && (*YArray)[CurrIdx] >= YMin && (*YArray)[CurrIdx] <= YMax)
+		{
+			Indexes[CurrIdx] = CurrIdx;
+		}
+	});*/
+
+	for (int i = 0; i < Num; ++i)
+	{
+		if ((*XArray)[i] >= XMin && (*XArray)[i] <= XMax && (!UseTwoValues || ((*YArray)[i] >= YMin && (*YArray)[i] <= YMax)))
+		{
+			Indexes.Emplace(i);
+		}
+	}
+
+	BrushPoints(Indexes, Add, Rebuild);
+}
+
+void UDataComponent::AddFilter_Box(FTransform Transform, FVector Extent, bool Add, bool Rebuild)
+{
+	TArray<int32> Indexes = TArray<int32>();
+
+	/*for (int i = 0; i < Points.Num(); ++i)
+	{
+		FVector WorldLoc = CalculateWorldLocOfPoint(&Points[i]);
+		if (UKismetMathLibrary::IsPointInBoxWithTransform(WorldLoc, Transform, Extent))
+		{
+			Indexes.Emplace(i);
+		}
+	}*/
+
+	APlot3D* Plot3D = Cast<APawnBase>(GetOwner())->Plot3D;
+	Indexes.Init(-1, Num);
+	ParallelFor(Num, [this, Transform, Extent, Add, &Indexes, Plot3D](int32 CurrIdx)
+	{
+		FVector WorldLoc = Plot3D->CalculateWorldLocOfPoint(CurrIdx);
+		if (UKismetMathLibrary::IsPointInBoxWithTransform(WorldLoc, Transform, Extent))
+		{
+			Indexes[CurrIdx] = CurrIdx;
+		}
+	});
+
+	BrushPoints(Indexes, Add, Rebuild);
+}
+
+void UDataComponent::AddFilter_Sphere(FVector Location, float Radius, bool Add, bool Rebuild)
+{
+	TArray<int32> Indexes = TArray<int32>();
+
+	/*for (int i = 0; i < Points.Num(); ++i)
+	{
+		FVector WorldLoc = CalculateWorldLocOfPoint(&Points[i]);
+		if ((Location - WorldLoc).Size() <= Radius)
+		{
+			Indexes.Emplace(i);
+		}
+	}*/
+
+	APlot3D* Plot3D = Cast<APawnBase>(GetOwner())->Plot3D;
+	Indexes.Init(-1, Num);
+	ParallelFor(Num, [this, Location, Radius, Add, &Indexes, Plot3D](int32 CurrIdx)
+	{
+		FVector WorldLoc = Plot3D->CalculateWorldLocOfPoint(CurrIdx);
+		if ((Location - WorldLoc).Size() <= Radius)
+		{
+			Indexes[CurrIdx] = CurrIdx;
+		}
+	});
+
+	BrushPoints(Indexes, Add, Rebuild);
+}
+
+void UDataComponent::BrushPoints(TArray<int32> BrushPoints, bool Add, bool Rebuild)
+{
+	for (int i = 0; i < BrushPoints.Num(); ++i)
+	{
+		BrushPoint(BrushPoints[i], Add);
+	}
+
+	Cast<APawnBase>(GetOwner())->Plot3D->BrushPoints(BrushPoints, Rebuild);
+	// TODO For all 2D Plots
+}
+
+void UDataComponent::BrushPoint(int32 PointIndex, bool Add)
+{
+	if (PointIndex == -1)
+	{
+		return;
+	}
+
+	IsBrushed[PointIndex] = Add;
+}
+
+// does not use the standard BrushPoints, for performance reasons
+void UDataComponent::ResetPoints(bool Rebuild)
+{
+	for (int i = 0; i < Num; ++i)
+	{
+		BrushPoint(i, false);
+	}
+
+	Cast<APawnBase>(GetOwner())->Plot3D->ResetPoints(Rebuild);
+	// TODO For all 2D Plots
+}
+
+// does not use the standard BrushPoints, for performance reasons
+void UDataComponent::InvertPoints(bool Rebuild)
+{
+	for (int i = 0; i < Num; ++i)
+	{
+		BrushPoint(i, !IsBrushed[i]);
+	}
+
+	/*ParallelFor(Points.Num(), [this](int32 CurrIdx)
+	{
+		BrushPoint(CurrIdx, Points[CurrIdx].IsEnabled());
+	});*/
+
+	/*ParallelFor(4, [this](int32 CurrIdx)
+	{
+		int32 Start = Points.Num() / 4 * CurrIdx;
+		int32 End = Points.Num() / 4 * (CurrIdx + 1);
+		for (int i = Start; i < End; ++i)
+		{
+			BrushPoint(i, Points[i].IsEnabled());
+		}
+	});*/
+
+	Cast<APawnBase>(GetOwner())->Plot3D->InvertPoints(Rebuild);
+	// TODO For all 2D Plots
+}
\ No newline at end of file

Source/ImmersiveAnalytics/DataComponent.h

+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Components/ActorComponent.h"
+#include "H5Cpp.h"
+#include "Runtime/Engine/Classes/Curves/CurveVector.h"
+#include "MyObject.h"
+#include "DataComponent.generated.h"
+using namespace H5;
+
+
+UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
+class IMMERSIVEANALYTICS_API UDataComponent : public UActorComponent
+{
+	GENERATED_BODY()
+
+public:	
+	UDataComponent();
+
+	UFUNCTION(BlueprintCallable, Category = HDF5)
+		void LoadFile(FString FileName);
+
+	UFUNCTION(BlueprintCallable, Category = HDF5)
+		void LoadStep(FString GroupName);
+
+	UPROPERTY(Category = Plot3D, EditAnywhere)
+		FString FileNameToLoadOnStart;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D)
+		UCurveVector* TransferFunction;
+
+	UPROPERTY(Category = Plot3D, EditAnywhere)
+		int32 OverrideMaxPointCount;
+
+	UFUNCTION(BlueprintCallable)
+		void AddFilter_Planes(FVector Normal, FVector Location, bool UseTwoPlanes, FVector NormalLeft, FVector LocationLeft, bool Add, bool Rebuild, bool Invert);
+
+	UFUNCTION(BlueprintCallable)
+		void AddFilter_ValueRange(EAxisType XType, float XMin, float XMax, EAxisType YType, float YMin, float YMax, bool Add, bool Rebuild, bool UseTwoValues);
+
+	UFUNCTION(BlueprintCallable)
+		void AddFilter_Box(FTransform Transform, FVector Extent, bool Add, bool Rebuild);
+
+	UFUNCTION(BlueprintCallable)
+		void AddFilter_Sphere(FVector Location, float Radius, bool Add, bool Rebuild);
+
+	UFUNCTION(BlueprintCallable)
+		void BrushPoints(TArray<int32> PointIndexes, bool Add, bool Rebuild);
+
+	UFUNCTION(BlueprintCallable)
+		void BrushPoint(int32 PointIndex, bool Add);
+
+	UFUNCTION(BlueprintCallable)
+		void ResetPoints(bool Rebuild);
+
+	UFUNCTION(BlueprintCallable)
+		void InvertPoints(bool Rebuild);
+
+	// 3d settings
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Default)
+		UMaterialInterface* D3_MaterialNontransparent;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Default)
+		UMaterialInterface* D3_MaterialTransparent;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D, BlueprintReadWrite)
+		FColor D3_BrushColor;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D, BlueprintReadWrite)
+		bool D3_BrushOverridesColor;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D, BlueprintReadWrite)
+		uint8 D3_BrushAlpha;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D, BlueprintReadWrite)
+		uint8 D3_SpriteAlpha;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D, BlueprintReadWrite)
+		bool D3_UseTransparency;
+
+	UPROPERTY(EditAnywhere, Category = Plot3D, BlueprintReadWrite)
+		float D3_SpriteSizeFactor;
+
+protected:
+	virtual void BeginPlay() override;
+
+private:	
+	H5File LoadedFile;
+	TArray<FString> GroupNames;
+	TArray<FString> FileNames;
+	FColor CalculateColorOfPoint(int32 Index, float Min, float Max);
+
+public:
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		int32 Num;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<bool> IsBrushed;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> X;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> Y;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> Z;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<FVector> PColor;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> U;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> V;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> W;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadWrite)
+		TArray<float> Length;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinLength;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxLength;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinX;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxX;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinY;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxY;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinZ;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxZ;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinU;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxU;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinV;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxV;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MinW;
+
+	UPROPERTY(Category = Plot3D, BlueprintReadOnly)
+		float MaxW;
+
+};

Source/ImmersiveAnalytics/HDF5Library.cpp

@@ -29,6 +29,15 @@ DataSet UHDF5Library::getDatasetByName(Group & group, char * name)
 	return dataset;
 }
 
+Group UHDF5Library::getGroupByName(H5File & file, FString name)
+{
+	char* NameAsCharArray = NULL;
+	NameAsCharArray = TCHAR_TO_ANSI(*name);
+	Group group = file.openGroup(NameAsCharArray);
+	return group;
+}
+
+/*
 Group UHDF5Library::getGroupByName(H5File & file, FString name)
 {
 	for (int i = 0; i < 1000; ++i)
@@ -60,9 +69,14 @@ Group UHDF5Library::getGroupByName(H5File & file, FString name)
 	}
 
 	return Group();
-}
+}*/
 
 bool UHDF5Library::ImportData(FString FileName, TArray<float>& X, TArray<float>& Y, TArray<float>& Z, TArray<float>& U, TArray<float>& V, TArray<float>& W)
+{
+	return false;
+}
+
+H5File UHDF5Library::LoadFile(FString FileName, TArray<FString>& GroupNames)
 {
 	/*
 	* Turn off the auto-printing when failure occurs so that we can
@@ -89,12 +103,35 @@ bool UHDF5Library::ImportData(FString FileName, TArray<float>& X, TArray<float>&
 	FString abspath = IFileManager::Get().ConvertToAbsolutePathForExternalAppForRead(*relpath);
 	char* pathAsCharArray = TCHAR_TO_ANSI(*abspath);
 
-	H5File file(pathAsCharArray, H5F_ACC_RDONLY);
-	Group group = getGroupByName(file, "Step#");
+	H5File File = H5File(pathAsCharArray, H5F_ACC_RDONLY);
+	
+	Group Root = File.openGroup("/");
 
-	/*
-	* Get dataspace of one dataset to get the dimension. (Dimensions must be equal for all sets.)
-	*/
+	GroupNames = TArray<FString>();
+
+	for (int i = 0; i < Root.getNumObjs(); i++) {
+		std::string GroupName;
+
+		switch (Root.getObjTypeByIdx((size_t)i))
+		{
+		case H5G_GROUP:
+			GroupName = Root.getObjnameByIdx((size_t)i);
+			GroupNames.Emplace(FString(GroupName.c_str()));
+			break;
+		default:
+			break;
+		}
+
+	}
+
+	return File;
+}
+
+bool UHDF5Library::LoadGroup(H5File File, FString GroupName, TArray<float>& X, TArray<float>& Y, TArray<float>& Z, TArray<float>& U, TArray<float>& V, TArray<float>& W)
+{
+	Group group = getGroupByName(File, GroupName);
+
+	// Get dataspace of one dataset to get the dimension. (Dimensions must be equal for all sets.)
 	DataSet dataset = getDatasetByName(group, "X");
 	DataSpace dataspace = dataset.getSpace();
 	int rank = dataspace.getSimpleExtentNdims();
@@ -103,55 +140,34 @@ bool UHDF5Library::ImportData(FString FileName, TArray<float>& X, TArray<float>&
 	int32 dimension = dims_out[0];
 	dataspace.selectAll(); // needed?
 
-	/*
-	* Output buffer initialization.
-	*/
-	//float data_out[262144]; /* output buffer */
+	// Output buffer initialization
 	float* data_out = new float[dimension];
 
-	/*
-	 * Read X
-	 */
+	// Read datasets
 	dataset.read(data_out, PredType::NATIVE_FLOAT);
 	X = TArray<float>(data_out, dims_out[0]);
 
-	/*
-	 * Read Y
-	 */
 	dataset = getDatasetByName(group, "Y");
 	dataset.read(data_out, PredType::NATIVE_FLOAT);
 	Y = TArray<float>(data_out, dims_out[0]);
 
-	/*
-	 * Read Z
-	 */
 	dataset = getDatasetByName(group, "Z");
 	dataset.read(data_out, PredType::NATIVE_FLOAT);
 	Z = TArray<float>(data_out, dims_out[0]);
 
-	/*
-	 * Read U
-	 */
 	dataset = getDatasetByName(group, "U");
 	dataset.read(data_out, PredType::NATIVE_FLOAT);
 	U = TArray<float>(data_out, dims_out[0]);
 
-	/*
-	 * Read V
-	 */
 	dataset = getDatasetByName(group, "V");
 	dataset.read(data_out, PredType::NATIVE_FLOAT);
 	V = TArray<float>(data_out, dims_out[0]);
 
-	/*
-	 * Read W
-	 */
 	dataset = getDatasetByName(group, "W");
 	dataset.read(data_out, PredType::NATIVE_FLOAT);
 	W = TArray<float>(data_out, dims_out[0]);
 
 	delete[] data_out;
 
-	// success
 	return true;
-}
\ No newline at end of file
+}

Source/ImmersiveAnalytics/HDF5Library.h

@@ -17,9 +17,12 @@ class IMMERSIVEANALYTICS_API UHDF5Library : public UBlueprintFunctionLibrary
 	GENERATED_BODY()
 
 public:
-	UFUNCTION(BlueprintCallable, meta = (DisplayName = "Test HDF5", Keywords = "TEST HDF5"), Category = HDF5)
+	UFUNCTION(BlueprintCallable, Category = HDF5)
 	static bool ImportData(FString FileName, TArray<float>& X, TArray<float>& Y, TArray<float>& Z, TArray<float>& U, TArray<float>& V, TArray<float>& W);
 
+	static H5File LoadFile(FString FileName, TArray<FString>& GroupNames);
+	static bool LoadGroup(H5File File, FString GroupName, TArray<float>& X, TArray<float>& Y, TArray<float>& Z, TArray<float>& U, TArray<float>& V, TArray<float>& W);