UE4虚拟纹理-(RuntimeVirtualTexture)转化为Texture

一。展示效果

1.如你所见把RuntimeVirtualTexture转化为了Texture

二。原理解释

1.中心思想把虚拟纹理渲染的图片数据拿到用图片数据创建Texture然后保存是不是很简单咋们开始把嘿嘿

2.画图讲解

(1)URuntimeVirtualTextureComponent里面存了UVirtualTextureBuilder里面存了UVirtualTexture2D ，UVirtualTexture2D是UTexture2D的子类

(2)拿到UTexture2D的照片信息

(3)创建照片储存照片

三。代码

4.26 版本可用

.h 头文件

UFUNCTION(BlueprintCallable, Category = "Pricture Tool")
		static bool CreateTexture2DAssetAsVirtual(URuntimeVirtualTextureComponent* InComponent, FString TextureName, FString TexturePath);

.Cpp 内容实现

bool UStaticBlueprintLibrary::CreateTexture2DAssetAsVirtual(URuntimeVirtualTextureComponent* InComponent, FString TextureName, FString TexturePath)
{
	TArray64<uint8> RawData1;
	int32 TextureWidth;
	int32 TextureHeight;
	FTextureSource VirtualSource;

	UVirtualTextureBuilder* VirtualTextureBuilder = InComponent->GetStreamingTexture();
	if (VirtualTextureBuilder)
	{
		if (VirtualTextureBuilder->Texture)
		{
			VirtualSource = VirtualTextureBuilder->Texture->Source;
		}
		
	}

	VirtualSource.GetMipData(RawData1, 0);
	TextureWidth = VirtualSource.GetSizeX();
	TextureHeight = VirtualSource.GetSizeY();

	FString PackageName = TEXT("/Game/");
	PackageName = PackageName + TexturePath;
	PackageName += TextureName;
	UPackage* Package = CreatePackage(NULL, *PackageName);
	Package->FullyLoad();

	UTexture2D* NewTexture = NewObject<UTexture2D>(Package, *TextureName, RF_Public | RF_Standalone | RF_MarkAsRootSet);

	NewTexture->AddToRoot();				// This line prevents garbage collection of the texture
	NewTexture->PlatformData = new FTexturePlatformData();	// Then we initialize the PlatformData
	NewTexture->PlatformData->SizeX = TextureWidth;
	NewTexture->PlatformData->SizeY = TextureHeight;
	NewTexture->PlatformData->SetNumSlices(1);
	NewTexture->PlatformData->PixelFormat = EPixelFormat::PF_B8G8R8A8;


	// Allocate first mipmap.
	FTexture2DMipMap* Mip = new(NewTexture->PlatformData->Mips) FTexture2DMipMap();
	Mip->SizeX = TextureWidth;
	Mip->SizeY = TextureHeight;

	// Lock the texture so it can be modified
	Mip->BulkData.Lock(LOCK_READ_WRITE);
	uint8* TextureData = (uint8*)Mip->BulkData.Realloc(RawData1.Num());
	FMemory::Memcpy(TextureData, RawData1.GetData(), RawData1.Num());
	Mip->BulkData.Unlock();

	NewTexture->MipGenSettings = TMGS_NoMipmaps;
	NewTexture->Source.Init(TextureWidth, TextureHeight, 1, 1, ETextureSourceFormat::TSF_BGRA8, RawData1.GetData());

	NewTexture->UpdateResource();
	Package->MarkPackageDirty();
	FAssetRegistryModule::AssetCreated(NewTexture);

	FString PackageFileName = FPackageName::LongPackageNameToFilename(PackageName, FPackageName::GetAssetPackageExtension());
	bool bSaved = UPackage::SavePackage(Package, NewTexture, EObjectFlags::RF_Public | EObjectFlags::RF_Standalone, *PackageFileName, GError, nullptr, true, true, SAVE_NoError);

	return true;
}

4.24代码可用 4.24的存储结构有点变化我相信你能看懂

.h 头文件

	UFUNCTION(BlueprintCallable, Category = "Pricture Tool")
		static bool CreateTexture2DAssetAsVirtual(URuntimeVirtualTextureComponent* InComponent, FString TextureName);

.Cpp 内容实现

bool UStaticBlueprintLibrary::CreateTexture2DAssetAsVirtual(URuntimeVirtualTextureComponent* InComponent, FString TextureName)
{
	TArray64<uint8> RawData1;
	int32 TextureWidth;
	int32 TextureHeight;
	FTextureSource VirtualSource;
	URuntimeVirtualTexture* VirtualTextureBuilder = InComponent->GetVirtualTexture();
	if (VirtualTextureBuilder)
	{
		if (VirtualTextureBuilder)
		{
			VirtualSource = VirtualTextureBuilder->StreamingTexture->Source;
		}
		
	}

	VirtualSource.GetMipData(RawData1, 0);
	TextureWidth = VirtualSource.GetSizeX();
	TextureHeight = VirtualSource.GetSizeY();

	FString PackageName = TEXT("/Game/ProceduralTextures/");
	PackageName += TextureName;
	UPackage* Package = CreatePackage(NULL, *PackageName);
	Package->FullyLoad();

	UTexture2D* NewTexture = NewObject<UTexture2D>(Package, *TextureName, RF_Public | RF_Standalone | RF_MarkAsRootSet);

	NewTexture->AddToRoot();				// This line prevents garbage collection of the texture
	NewTexture->PlatformData = new FTexturePlatformData();	// Then we initialize the PlatformData
	NewTexture->PlatformData->SizeX = TextureWidth;
	NewTexture->PlatformData->SizeY = TextureHeight;
	NewTexture->PlatformData->SetNumSlices(1);
	NewTexture->PlatformData->PixelFormat = EPixelFormat::PF_B8G8R8A8;


	// Allocate first mipmap.
	FTexture2DMipMap* Mip = new(NewTexture->PlatformData->Mips) FTexture2DMipMap();
	Mip->SizeX = TextureWidth;
	Mip->SizeY = TextureHeight;

	// Lock the texture so it can be modified
	Mip->BulkData.Lock(LOCK_READ_WRITE);
	uint8* TextureData = (uint8*)Mip->BulkData.Realloc(RawData1.Num());
	FMemory::Memcpy(TextureData, RawData1.GetData(), RawData1.Num());
	Mip->BulkData.Unlock();

	NewTexture->MipGenSettings = TMGS_NoMipmaps;
	NewTexture->Source.Init(TextureWidth, TextureHeight, 1, 1, ETextureSourceFormat::TSF_BGRA8, RawData1.GetData());

	NewTexture->UpdateResource();
	Package->MarkPackageDirty();
	FAssetRegistryModule::AssetCreated(NewTexture);

	FString PackageFileName = FPackageName::LongPackageNameToFilename(PackageName, FPackageName::GetAssetPackageExtension());
	bool bSaved = UPackage::SavePackage(Package, NewTexture, EObjectFlags::RF_Public | EObjectFlags::RF_Standalone, *PackageFileName, GError, nullptr, true, true, SAVE_NoError);

	return true;
}

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