timmhess / unrealimagecapture Goto Github PK

I run this plugin normally on windows.
But on linux server, when render offscreen, the metahuman's groom hair disappered in some frame, so the hair blinks in the final video.
Have you tried this code RenderOffScreen on linux server？Weird problems.
Any hint will be appreciated~

Hey there!

First of all let me congratulate you for this plugin. I haven't been able to get it running yet but it looks really well written and should be a great starting point for trying to understand what's going on in the guts of Unreal Engine.

I'm using UE 5.2.0 and I had some trouble adding CameraCaptureManager_BP.uasset to the scene. The editor was always giving errors such as:

VerifyImport: Failed to find script package for import object 'Package /Script/CameraCaptureToDisk'
CreateExport: Failed to load Parent for BlueprintGeneratedClass /CameraCaptureToDisk/CameraCaptureManager_BP.CameraCaptureManager_BP_C
Unable to load Default__CameraCaptureManager_BP_C with outer Package /CameraCaptureToDisk/CameraCaptureManager_BP because its class (CameraCaptureManager_BP_C) does not exist

I tried both using the project already included in your repo and creating new projects (with all kinds of configurations I could think of), without success.

At first I thought what was missing was the reference to the the C++ class, so I tried moving the CameraCaptureManager.cpp/.h pair pretty much everywhere, again without success. I finally came across a post about redirects in Config/DefaultEngine.ini and that seems to have finally solved my problem.

Basically, after creating a new project with the first person template (called TestImageCapture1), I copied CameraCaptureManager.cpp/.h to Source/TestImageCapture1, CameraCaptureManager_BP.uasset to Content/CameraCaptureToDisk/Blueprints and I added these two lines to Config/DefaultEngine.ini under the [/Script/Engine.Engine] section:

+ActiveGameNameRedirects=(OldGameName="/Script/CameraCaptureToDisk.CameraCaptureManager",NewGameName="/Script/TestImageCapture1.CameraCaptureManager")
+ActiveClassRedirects=(OldClassName="/Script/CameraCaptureToDisk.CameraCaptureManager",NewClassName="/Script/TestImageCapture1.CameraCaptureManager")

Now the blueprint has a parent again and I can add it to the scene.

Hi there,
I've tried to package the project but apparently, it doesn't work. This is the error I'm having:
UATHelper: Packaging (Windows (64-bit)): CaptureManager.cpp.obj : error LNK2005: "public: __cdecl AsyncSaveImageToDiskTask::~AsyncSaveImageToDiskTask(void)" (??1AsyncSaveImageToDiskTask@@QEAA@XZ) already defined in Module.CameraCaptureToDisk.cpp.obj UATHelper: Packaging (Windows (64-bit)): CaptureManager.cpp.obj : error LNK2005: "public: void __cdecl AsyncSaveImageToDiskTask::DoWork(void)" (?DoWork@AsyncSaveImageToDiskTask@@QEAAXXZ) already defined in Module.CameraCaptureToDisk.cpp.obj UATHelper: Packaging (Windows (64-bit)): Creating library C:\Users\Administrator\Desktop\UnrealImageCapture-master (1)\UnrealImageCapture-master\CaptureToDisk\Binaries\Win64\CaptureToDisk.lib and object C:\Users\Administrator\Desktop\UnrealImageCapture-master (1)\UnrealImageCapture-master\CaptureToDisk\Binaries\Win64\CaptureToDisk.exp UATHelper: Packaging (Windows (64-bit)): C:\Users\Administrator\Desktop\UnrealImageCapture-master (1)\UnrealImageCapture-master\CaptureToDisk\Binaries\Win64\CaptureToDisk.exe : fatal error LNK1169: one or more multiply defined symbols found UATHelper: Packaging (Windows (64-bit)): Took 18.544797s to run UnrealBuildTool.exe, ExitCode=6 UATHelper: Packaging (Windows (64-bit)): UnrealBuildTool failed. See log for more details. (C:\Users\Administrator\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_4.26\UBT-CaptureToDisk-Win64-Development.txt) UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=6 (6) UATHelper: Packaging (Windows (64-bit)): BUILD FAILED PackagingResults: Error: Unknown Error

Do you have any idea how I can fix this?

Many thanks in advance

Hello @TimmHess ! Thank you so much for your outstanding work! I am currently working on generating synthesized RGB data with corresponding depth for my deep learning training. I am very new to the unreal engine and this area but I can follow your steps in readme and try to manage to capture materials. However, with my blueprint setting, I cannot see any log info and images cannot be saved in my directory. What am I doing wrong? Or how can I achieve this by capturing RGB and depth in pure c++?(I am ok with c++)

Attached are my blueprint settings.

Thanks in advance! Hope you will spare your time to save my silly question...

Hey there,

pardon me for keep opening issues on probably trivial problems to solve, but this one is really defying my debugging abilities.

The problem is: if I use your CameraCaptureToDisk example (without plugin, I can't find a way to compile it), I can capture RGB images and semantic segmentation masks without any problem.

Conversely, if I create a new project (always without plugin) using the first person template and map, and I try to repeat all the steps:

1. copy CameraCaptureManager.h/.cpp from the plugin to Prjname/Source/Prjname,
2. add the dependencies to Prjname.Build.cs to avoid linking errors,
3. copy CameraCaptureManager_BP.uasset to Content/CameraCaptureToDisk/Blueprints and PP_Segmentation.uasset to Content,
4. build+cook+run
5. open the project and add the two CameraCaptureManager objects and the two SceneCapture2D objects (children of a CameraActor object for convenience),
6. have the two CameraCaptureManagers use the respective SceneCapture2D objects and, only for that concerning the segmentation masks, tick the PNG flag and add PP_Segmentation as postprocess material,
7. edit the level blueprint and make the capture pipeline activate by pressing a key on the keyboard,

I can still capture RGB images but I capture corrupt semantic segmentation masks.

I've tried every possible fix/workaround that came to my mind, the first of which was obviously disabling the alpha channel fix that I proposed in the pull request (it seems to be irrelevant in this sense, it works fine on both CameraCaptureToDisk and my project). What am I doing wrong? Sounds like an alignment issue. The image seems to be there but it's badly aligned, do I see correctly?

Dear TimmHess

Thanks for your code! I am trying to use your plugin to obtain scene depth but crashes every time when I tried to capture depth image.

I am using UE5.03 and created a blank C++ project. I added the UE5 plugin to the project, add the CameraCaptureManager_BP to the scene, and added a SceneCapture2D as capture component, used PP_depth as the material

The level blueprint is shown as follow.

When I tried to capture depth, the UE crashed at line
imageWrapper->SetRaw(nextRenderRequest->Image.GetData(), nextRenderRequest->Image.GetAllocatedSize(), FrameWidth, FrameHeight, ERGBFormat::BGRA, 16);

I got the error. Assertion failed: (int64)ChannelCount * Width * Height * RawBitDepth == RawData.Num() * 8
I am check the image size using nextRenderRequest->Image.GetAllocatedSize(), it returns 2457600 = 640x480x8. should that be 640x480x8x4 since there are RGBA 4 channels?

I really hope you can shed light on my question and help me here, I've been struggling for last 2 days.

Your help is really appreciated!

Hi,
I downloaded your project, compiled it and tried to run it.
But when I press C the game crush with no apparent error.
Do you know why?

Hi,

Apologies for the newby question. I have a 2DSceneCapture component that I have very simply made to follow an actor. I want to access the data from the scene capture in C++ so I can do some postprocessing with the image. I don't want to save to disk however.

Is this code under the Setup A ColorCapture Component section in your read me assigning the raw image data from the scene capture to the variable renderTarget2D? So my question is, is this render target basically holding the image data?:

// Assign RenderTarget
    captureComponent->GetCaptureComponent2D()->TextureTarget = renderTarget2D;

Thanks in advance

Hi! I tried to extract visual features from these captured images, but just found that the image quality is not good enough for supporting my algorithm to run through it.

So I really want to know if there is any way to improve the quality of stored images (I don't care whether huge volumn of raw data will slow down my game or not) and forget about the performance, the clearer the images I get the better!

For now, I've tried several ways but none of them have achieved my goal.

• increase the value of renderTarget2D->SizeX in SetupColorCaptureComponent() does not provide any help
• change renderTarget2D->InitCustomFormat(640, 480, PF_B8G8R8A8, true); to
  renderTarget2D->InitCustomFormat(640, 480, PF_R32G32B32A32_UINT, true); and
  renderTarget2D->RenderTargetFormat = ETextureRenderTargetFormat::RTF_RGBA32f.
  Of course the same operation will be done in the Tick() function, but this end up to a bad result that AsyncSaveImageToDiskTask cannot cope with TArray<uint32>
• in SetupColorCaptureComponent(), add captureComponent->GetCaptureComponent2D()->ShowFlags.ScreenPercentage = 200 and
  captureComponent->GetCaptureComponent2D()->ShowFlags.SetScreenPercentage(true)
  this was done since I found that if you increase the "Screen Percentage" value from the menu in viewport, the quality of showing pictures in viewport will become much better and I don't know why. But adding this in C++ codes does not get any improvement either.

Hi,
I downloaded your project, compiled it and tried to run it with UE5.
But when I hit play, and press C the whole UE5 crush with the following errors:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000009800000052

ucrtbase
ucrtbase
ucrtbase
UnrealEditor_Core
UnrealEditor_ImageWrapper
UnrealEditor_ImageWrapper
UnrealEditor_CameraCaptureToDisk!ACameraCaptureManager::Tick() [D:\code\UnrealImageCapture\CaptureToDisk\Plugins\CameraCaptureToDisk\Source\CameraCaptureToDisk\Private\CameraCaptureManager.cpp:72]
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

Do you know why?

Hello Everyone,
I am trying to capture and save image to disc every frame from a camera sensor in unreal engine 5.2. At every tick i try to capture and save image to disc. i tried to use code from this repo. But when i try to save every frame, scene freezes and same image is rendered at every frame. but if i capture image at alternate frame it works. Here are my code. I would really appreciate any help.
// PinHoleCineCamera.cpp
#include "PinHoleCineCamera.h"
#include "Engine.h"
#include "Engine/SceneCapture2D.h"
#include "Runtime/Engine/Classes/Components/SceneCaptureComponent2D.h"
#include "CineCameraComponent.h"
#include "Kismet/GameplayStatics.h"
#include "ShowFlags.h"
#include "RHICommandList.h"
#include "ImageWrapper/Public/IImageWrapper.h"
#include "ImageWrapper/Public/IImageWrapperModule.h"
#include "ImageUtils.h"
#include "Modules/ModuleManager.h"
#include "Misc/FileHelper.h"
#include "Engine/TextureRenderTarget2D.h"
#include "Engine/Texture2D.h"
#include "Misc/FileHelper.h"
#include "IImageWrapper.h"
#include "HAL/PlatformProcess.h"
#include "RenderingThread.h"
#include "ImageUtils.h"
#include "Engine/World.h"
#include "Engine/GameViewportClient.h"
#include "IImageWrapperModule.h"

APinHoleCineCamera::APinHoleCineCamera(const FObjectInitializer& ObjectInitializer) : ACineCameraActor(ObjectInitializer)
{
//RootComponent = CreateDefaultSubobject(TEXT("RootComponent"));
UCineCameraComponent* CineCameraComponent1 = GetCineCameraComponent();
SceneCaptureComponent = CreateDefaultSubobject(TEXT("SceneCaptureComponent"));
SceneCaptureComponent->AttachToComponent(CineCameraComponent1, FAttachmentTransformRules::KeepRelativeTransform);
// Set the SceneCaptureComponent properties
SceneCaptureComponent->ProjectionType = ECameraProjectionMode::Perspective;
//SceneCaptureComponent->OrthoWidth = 0.0f; // Set OrthoWidth to 0 for perspective projection
SceneCaptureComponent->FOVAngle = 93.665;
// Set Camera Properties
SceneCaptureComponent->CaptureSource = ESceneCaptureSource::SCS_FinalColorHDR;
SceneCaptureComponent->ShowFlags.SetTemporalAA(true);
}
void APinHoleCineCamera::AttachPinHoleCameraToVehicle(AActor* Vehicle, PINHOLECINECAMERACfg SensorCfg_, float FixedDeltaTime_) {

SensorCfg = SensorCfg_;
FixedDeltaTime = FixedDeltaTime_;
if (Vehicle) {
    SetActorRelativeLocation(SensorCfg.TranslationSensorToVehicle);
    SetActorRelativeRotation(SensorCfg.RotationSensorToVehicle);
    if (AttachToActor(Vehicle, FAttachmentTransformRules::KeepRelativeTransform)) {
        UE_LOG(LogTemp, Log, TEXT("PinHole: Sensor attached to EGO vehicle."));
    }
    else {
        UE_LOG(LogTemp, Error, TEXT("PinHole: Error during sensor attachment to EGO vehicle."));
    }
}
else {
    UE_LOG(LogTemp, Error, TEXT("PinHole: No parent vehicle found."));
}
// Make sure that output folder exists
if (!FPaths::DirectoryExists(SensorCfg.PathSave)) {
    FPlatformFileManager::Get().GetPlatformFile().CreateDirectoryTree(*SensorCfg.PathSave);
}  
UE_LOG(LogTemp, Log, TEXT("[PinHoleCineCamera] Pin Hole camera settings applied"));

}

void APinHoleCineCamera::GetPinHoleCineCameraData() {
const uint32_t Timestamp = std::round(FixedDeltaTime * Frame * 1000);
Frame = Frame + 1U;
// Read pixels once RenderFence is completed
if (!RenderRequestQueue.IsEmpty()) {
// Peek the next RenderRequest from queue
FRenderRequestStruct* nextRenderRequest = nullptr;
RenderRequestQueue.Peek(nextRenderRequest);
if (nextRenderRequest) { //nullptr check
if (nextRenderRequest->RenderFence.IsFenceComplete()) { // Check if rendering is done, indicated by RenderFence
// Load the image wrapper module
IImageWrapperModule& ImageWrapperModule = FModuleManager::LoadModuleChecked(FName("ImageWrapper"));
FString FrameNumberString = FString::Printf(TEXT("%06d.png"), Timestamp);
FString FilePath = FPaths::Combine(SensorCfg.PathSave, FrameNumberString);
static TSharedPtr imageWrapper = ImageWrapperModule.CreateImageWrapper(EImageFormat::PNG); //EImageFormat::PNG //EImageFormat::JPEG
imageWrapper->SetRaw(nextRenderRequest->Image.GetData(), nextRenderRequest->Image.GetAllocatedSize(), FrameWidth, FrameHeight, ERGBFormat::BGRA, 8);
const TArray64& ImgData = imageWrapper->GetCompressed(5);
//const TArray& ImgData = static_cast<TArray<uint8, FDefaultAllocator>> (imageWrapper->GetCompressed(5));
RunAsyncImageSaveTask(ImgData, FilePath);
}
}
}
}

void APinHoleCineCamera::CaptureNonBlocking() {
if (!IsValid(SceneCaptureComponent)) {
UE_LOG(LogTemp, Error, TEXT("CaptureColorNonBlocking: CaptureComponent was not valid!"));
return;
}
SceneCaptureComponent->TextureTarget->TargetGamma = GEngine->GetDisplayGamma();
FTextureRenderTargetResource* renderTargetResource = SceneCaptureComponent->TextureTarget->GameThread_GetRenderTargetResource();

UE_LOG(LogTemp, Warning, TEXT("Got display gamma"));
struct FReadSurfaceContext { FRenderTarget* SrcRenderTarget;
                             TArray<FColor>* OutData;
                             FIntRect Rect;
                             FReadSurfaceDataFlags Flags;};

UE_LOG(LogTemp, Warning, TEXT("Inited ReadSurfaceContext"));
// Init new RenderRequest
FRenderRequestStruct* renderRequest = new FRenderRequestStruct();
UE_LOG(LogTemp, Warning, TEXT("inited renderrequest"));

// Setup GPU command
FReadSurfaceContext readSurfaceContext = {
    renderTargetResource,
    &(renderRequest->Image),
    FIntRect(0,0,renderTargetResource->GetSizeXY().X, renderTargetResource->GetSizeXY().Y),
    FReadSurfaceDataFlags(RCM_UNorm, CubeFace_MAX)
};
UE_LOG(LogTemp, Warning, TEXT("GPU Command complete"));
// Above 4.22 use this
ENQUEUE_RENDER_COMMAND(SceneDrawCompletion)(
    [readSurfaceContext](FRHICommandListImmediate& RHICmdList) {
        RHICmdList.ReadSurfaceData(
            readSurfaceContext.SrcRenderTarget->GetRenderTargetTexture(),
            readSurfaceContext.Rect,
            *readSurfaceContext.OutData,
            readSurfaceContext.Flags
        );
    });

// Notifiy new task in RenderQueue
RenderRequestQueue.Enqueue(renderRequest);
// Set RenderCommandFence
renderRequest->RenderFence.BeginFence();
renderRequest->RenderFence.Wait();
if (renderRequest->RenderFence.IsFenceComplete()) {
    UE_LOG(LogTemp, Warning, TEXT("fencing complete"));
    GetPinHoleCineCameraData();
    // Delete the first element from RenderQueue
    RenderRequestQueue.Pop();
    delete renderRequest;
}
else {
    UE_LOG(LogTemp, Error, TEXT("fencing not complete"));
    FPlatformProcess::Sleep(0.01f);
    CaptureNonBlocking();
}

}
void APinHoleCineCamera::RunAsyncImageSaveTask(TArray64 Image, FString ImageName) {
(new FAutoDeleteAsyncTask(Image, ImageName))->StartBackgroundTask();
}

AsyncSaveImageToDiskTask::AsyncSaveImageToDiskTask(TArray64 Image, FString ImageName) {
ImageCopy = Image;
FileName = ImageName;
}

AsyncSaveImageToDiskTask::~AsyncSaveImageToDiskTask() {
UE_LOG(LogTemp, Warning, TEXT("AsyncTaskDone"));
}

void AsyncSaveImageToDiskTask::DoWork() {
FFileHelper::SaveArrayToFile(ImageCopy, *FileName);
//UE_LOG(LogTemp, Error, TEXT("Stored Image: %s"), *FileName);
}
// PinHoleCineCamera.h
#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "CineCameraActor.h"
#include "Containers/Queue.h"
#include "Engine/SceneCapture2D.h"
#include "Components/SceneCaptureComponent2D.h"
#include "PinHoleCineCamera.generated.h"

struct PINHOLECINECAMERACfg {
// Rotation from sensor coordinate system to vehicle coordinate system.
FRotator RotationSensorToVehicle;
// Translation from sensor coordinate system to vehicle coordinate system.
FVector TranslationSensorToVehicle;
// Path where to save the csv logger file.
FString PathSave;
// Sensor frequency
float Frequency;
};

USTRUCT()
struct FRenderRequestStruct {
GENERATED_BODY()
TArray Image;
FRenderCommandFence RenderFence;
FRenderRequestStruct() {}
};

UCLASS()
class AVL_UE5_API APinHoleCineCamera : public ACineCameraActor{
GENERATED_BODY()
public:
APinHoleCineCamera(const FObjectInitializer& ObjectInitializer);
protected:
//virtual void BeginPlay() override;
virtual void BeginPlay() override {
Super::BeginPlay();
};

public:
//virtual void Tick(float DeltaTime) override;
void AttachPinHoleCameraToVehicle(AActor* Vehicle, PINHOLECINECAMERACfg SensorCfg, float FixedDeltaTime);
void GetPinHoleCineCameraData();
UFUNCTION(BlueprintCallable, Category = "ImageCapture")
void CaptureNonBlocking();
//bool IsPreviousFenceComplete() const;
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Capture")
int FrameWidth = 4112;
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Capture")
int FrameHeight = 2176;
protected:
int ImgCounter = 0;
void RunAsyncImageSaveTask(TArray64 Image, FString ImageName);
// RenderRequest Queue
TQueue<FRenderRequestStruct*> RenderRequestQueue;
private:
UPROPERTY(EditAnywhere, Category = "Capture")
USceneCaptureComponent2D* SceneCaptureComponent;
PINHOLECINECAMERACfg SensorCfg;
FString TestSequenceNumber;
float FixedDeltaTime;
int32_t Frame = 0;
};

class AsyncSaveImageToDiskTask : public FNonAbandonableTask {
public:
AsyncSaveImageToDiskTask(TArray64 Image, FString ImageName);
~AsyncSaveImageToDiskTask();
FORCEINLINE TStatId GetStatId() const {
RETURN_QUICK_DECLARE_CYCLE_STAT(AsyncSaveImageToDiskTask, STATGROUP_ThreadPoolAsyncTasks);
}
protected:
TArray64 ImageCopy;
FString FileName = "";
public:
void DoWork();
};

Hi @TimmHess, thanks for this repo. I am having similar issues. Would you be able to help me with it? I tried what you suggested above (the GEngine->GetDisplayGamma() part) but they change very little. Right now, I have:

Editor:

Saved Image:

I am using jpegs to save by the way - I changed the ERGB format on CameraCaptureManager.cpp Tick() to RGBA. Also changed the pixel format on SetupCameraComponent to PF_R8G8B8A8 to match it.

Thanks a lot for your help! (Also commented on #8, not sure whether you want a new issue or just the old one.)

Hi,
I set Use Float to false to export .png file, but when I press the control button, the simulation engine crashes.

As the title claims, I cannot get a image capture to compleate without crashing unreal. I've tried compilin the sample project in both UE 5.0.3 and 5.1.0, and also tried installing it as a plugin in a fresh project. Same result.

I'm triggering the capture in a utility widget like so.

Error message always throws at line 185 in "C:\Users\*****\Documents\Unreal Projects\ImageCapture\Plugins\CameraCaptureToDisk\Source\CameraCaptureToDisk\Private\CameraCaptureManager.cpp". Attempting to run a float-non-blocking results in similar crash at line 250.

Error:

LoginId:9b7e3dc9443559f5ff884dad673f1823
EpicAccountId:1ea2120a2eaa42989234477b1afde595

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x00000000000004b0

UnrealEditor_CameraCaptureToDisk!ACameraCaptureManager::CaptureNonBlocking() [C:\Users\******\Desktop\CaptureToDisk\Plugins\CameraCaptureToDisk\Source\CameraCaptureToDisk\Private\CameraCaptureManager.cpp:185]
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_UMG
UnrealEditor_UMG
UnrealEditor_UMG
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
UnrealEditor_ApplicationCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

Hi again,

This time I used the plugin in CityPark.
I'm able to save color and depth but the segmentation comes out black.
I repeated the same steps as in this project. I would like to get different segmentation for trees/ sidewalk for example.
Thank you.

I'm using this code in vs2022, the compile returns not defined error. Am I missing something? Any hint will be appreciated.

ENQUEUE_RENDER_COMMAND(SceneDrawCompletion)(
[renderTargetResource](FRHICommandListImmediate& RHICmdList) {
FTexture2DRHIRef Target = renderTargetResource->GetRenderTargetTexture();
RenderRequest->Readback.EnqueueCopy(RHICmdList, Target);
});

Hi, It's me again :)
I have one problem. When rendering pictures by code, I got weird camera exposure and color issues. The detail can be seen in the following, the first is the preview screen when hit the play button in the ue4 editor, and the second is rendered by code.

I'm running the rendering code as you are, including the config of the UTextureRenderTarget2D. I think the problem comes from the config of UTextureRenderTarget2D and I don't know how to modify the config. Am I right or do you know the reason? Thanks a lot~

Hey i thought it would be better to make a new issue for people to better find this than my question being embedded into an unrelated issue topic.

I wanted to ask though @TimmHess. Would it require a lot of rewriting and editing to make it save a UTextureRenderTarget2D object instead of saving what is currently shown via the capture2d camera? Long story short i'm wanting to send my Composure renders over the network but my first goal is to at least get it to save to a jpeg without issue first.
Composure has a lovely virtual override function called "RelayOutput_Implementation" where i can get the UTextureRenderTarget2D object. I tried to simply slot in the object into your code hoping it would work but i'm still newish to C++ and UE and have been learning it through trial by fire at this point but when it comes to sending requests to the GPU, that's when i get a bit out of my depth.

added input for a UTextureRenderTarget2D and tried to use that for the renderTargetResource variable

But on further inspection i think i was going about this all wrong as the UTextureRenderTarget2D already has an image and i'm not needing to request an image from the GPU as that's all already handled by Composure. Below is an error i get with my current code, as well as the line where it breaks. But again i assume this is because i'm not requesting the image from the gpu like your current setup does.

I can see that when you use GetData on line 118 you have nextRenderRequest->Image.GetData() which returns a TArray which i assume is the data type that's needed for this to work. Can you see a way for this to work if i already have a UTextureRenderTarget2D object? The ReadPixels function is so ungodly slow and assume the Image.GetData() is a much faster process in comparison.

These are the steps I followed to get a minimal version of this pipeline working.

I rebuilt the Plugin for UE-5.3, but could not get the Plugin to work properly (There were errors in the CameraCaptureManager_BP and I could not place it in the Editors).

Similarly to #35, I ended up porting the source files into a project (MyProject) and building everything in that project. Here are the notes I took along the way:

• Moved from UnrealImageCapture/Plugin_UE5, the files CameraCaptureManager.cpp, CameraCaptureManager.h to MyProject/Source/MyProject/.
• Solve the linking issues by modifying MyProject.Build.cs

public class MyProject : ModuleRules
{
	public MyProject(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(new string[] { 
			"Core",
			"InputCore", 
			"ImageWrapper", 
			"RenderCore", 
			"Renderer", 
			"RHI",
			"CoreUObject",
			"Engine",
			"Slate",
			"SlateCore",
		});

}

• You should be able to compile the C++ code now using VSCode's build task.
• Check that things are working by looking for CameraCaptureManager in the Editor's content manager under C++ Classes.
• Drag and drop CameraCaptureManager into the viewport.
• Place a SceneCapture2D actor (from the Place Actor Panel)
• Set the CaptureComponent of CameraCaptureManager to point to the SceneCapture2D camera.
• Open the Level's Blueprint and connect a Capture Non Blocking function to a EnhancedInputComponent that triggers when the desired key-binding is pressed.
• Play the map, and press the selected capture key-binding.

Hi,
I'd like to know if it would be difficult to create a plugin from your code?
I'm using blueprints (I'm not a coder), and I think it would be great to have a plugin that could let the users choose the outputs they need (ground truth, semantic segmentation, depth, normals...).
I can't use UnrealCV anymore (no more update), so your code could be a great alternative!
Best,
n.

Hi there,
I've tried rendering PNGs in the sample project and it doesn't generate anything. It first the image taking flow but then the folder remains empty...
Do you have any idea where to start looking to fix it?

Hi there,
I've just pulled your project and opened CaptureToDisk Unreal project.
But I got stuck generating the images. Can you help me, what exactly do I have to do to start saving images?
Many thanks in advance

After all your help, I was able to capture the wanted images.

One thing I don't understand is how to get the depth values.

When I'm opening the depth (exr files) they look very similar to the segmentation.

How the depth is calculated.

I'm attaching what I tried:

Heya, i'm having some issues when trying to use your plugin (which i greatly appreciate that even exists! shame the others got abandoned) which is triggering an access violation when i try to implement it into my scene.

I've got the CameraCaptureManager_BP in my scene with the same settings (it was basically a copy and paste) from your demo scene.
whilst typing this i noticed there wasnt a "/" in the sub directory name, i tested it with a "/" and still same result.

with the same node network in my level BP

And i've also got the ActorSceneCaptureComp2d as a child of my pawn, just like your demo scene.

But within your demo scene I've also tried to move the network to run the "Capture Float Non Blocking" node inside my actor instead of the level BP and disconnected the network in the level BP. This also seems to trigger a memory access violation in the line.

I don't suppose you've yet to run into this? I'm on UE 5.1.1
My end goal would be to get the image in C++ and not to save to disk. It was great to see that others are looking to try and do this as well as we may be having the same goal. Hoping to get the raw 32bit image later down the line though.

Thanks

Hi there! I am new to UE4 and I just found your job of solving the image saving stuck problem.
I tried all my best to practice your solution but VS just brought up so much wrong info during the compiling process.

• (1) cannot convert to "const TArray<uint8, FDefaultAllocator> &" from "const TArray<uint8, FDefaultAllocator64>"

• (2) LNK2019 �޷��������ⲿ���� "__declspec(dllimport) public: void __cdecl FRHICommandListImmediate::ReadSurfaceData(class FRHITexture *,struct FIntRect,class TArray<struct FColor,class TSizedDefaultAllocator<32> > &,class FReadSurfaceDataFlags)" (_imp?ReadSurfaceData@FRHICommandListImmediate@@QEAAXPEAVFRHITexture@@UFIntRect@@aeav?$TArray@UFColor@@v?$TSizedDefaultAllocator@$0CA@@@@@VFReadSurfaceDataFlags@@@z)���÷����ں��� "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z) �б����� IMUTrial C:\Users\l00595286\Documents\Unreal Projects\IMUTrial\Intermediate\ProjectFiles\CaptureManager.cpp.obj 1

Problem (1) happened when "const TArray& ImgData = imageWrapper->GetCompressed(5);" in void ACaptureManager::Tick() function from CaptureManager.cpp. And I solved this by adding a const_cast<> to force the converting

Problem (2) just cannot be solved and in fact, I do not really kown why there is so much wierd symbols instead of showing English.

I also tried to copy your code into my game project(I have adapted it to suit my running environment), but the same error happened and I just don't know what I can do about that.

after add "RHI", "Renderer", "RenderCore" modules,it's can run as editor, but after package ,it cant run ,even dont create any log.

Hey there,

I was wondering if you could point me in right direction of using your code to access the raw scene depth (as given by the "Scene Depth" node in the material editor) and save it to disk.

I managed to get a 0-255 grayscaled depth image using a post processing material, but I could not manage yet to get a hold of the scene depth using Blueprint or C++, since the raw scene has a much higher precision than my approach.

One would have to access the gbuffer somehow, but I could not find any good resource on that topic yet.

Any hints are much appreciated.

Does float capture & depth capture work right now? I can't seem to get this working, at least in UE5.0.3.

The color RGBA capture works fine though.

Read access on imageWrapper->SetRaw...

Maybe I configured something wrong?

I think the code creates it own render target and such, but I used:
RenderTarget setup with RGBA16f
SceneCaptureComponent2D setup with HDR in RGB, SceneDepth in A.
CameraCaptureManager setup with UseFloat on and the capture component set. UsePNG off.

Hey! I just bumped into this useful plugin, since I am trying to get frames from two (or more) Scene Capture components to be sent via TCP. I managed to get it working with a simple C++ class with a single camera, but I am new to both Unreal and C++, so I can't go further. Did you ever try to implement this kind of pipeline?

There's an TArray change to lines 80 & 90 of CameraCaptureManager.cpp. In UE4.26, IImageWrapper->GetCompressed returns a TArray64, however RunAsyncImageSaveTask digests a TArray. Need to convert the TArray64 into a TArray to get it working. I've already made the change on my end and tested it in 4.26.

I use a camera actor, and attached a SceneCaptured2D component, and use CamereCaptureToDisk plugin. I can save images while game playing, but the quality of saved image is much lower than the Game Play shows. How to adjust the rendering settings of this plugin?

Appreciated this tutorial a lot, this helped me very much and really saved my time. Thanks! :) By the way, I'm an AI researcher fresh new to ue4.

I had a few problems when I reproduce the code in a new project step by step, I can barely compile the code successfully. I've tried this code in both ue4.25 with vs2019 and ue4.22 with vs2017, neither of them can successfully reproduce this repo.
I'll list some of the issues I met.

1. The struct FRenderRequest added at the very begin, I had to modify the code from FRenderCommandFence RenderFence to FRenderCommandFence* RenderFence, and then it can be compiled.
   But when I use FRenderCommandFence* RenderFence, it will cause other errors, for instance in line 184 code renderRequest->RenderFence->BeginFence(); will output error:

2>     Creating library D:\Users\56485\Documents\Unreal Projects\VelocityDemo\Intermediate\Build\Win64\UE4Editor\Development\VelocityDemo\UE4Editor-VelocityDemo-0056.suppressed.lib and object D:\Users\56485\Documents\Unreal Projects\VelocityDemo\Intermediate\Build\Win64\UE4Editor\Development\VelocityDemo\UE4Editor-VelocityDemo-0056.suppressed.exp
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl FRenderCommandFence::BeginFence(bool)" (__imp_?BeginFence@FRenderCommandFence@@QEAAX_N@Z) referenced in function "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z)
2>D:\Users\56485\Documents\Unreal Projects\VelocityDemo\Binaries\Win64\UE4Editor-VelocityDemo-0056.dll : fatal error LNK1120: 1 unresolved externals

2. code using ENQUEUE_RENDER_COMMAND and RenderRequestQueue:

    ENQUEUE_RENDER_COMMAND(SceneDrawCompletion)(
    [readSurfaceContext](FRHICommandListImmediate& RHICmdList){
        RHICmdList.ReadSurfaceData(
            readSurfaceContext.SrcRenderTarget->GetRenderTargetTexture(),
            readSurfaceContext.Rect,
            *readSurfaceContext.OutData,
            readSurfaceContext.Flags
        );
    });

    // Notify new task in RenderQueue
    RenderRequestQueue.Enqueue(renderRequest);

    // Set RenderCommandFence
    renderRequest->RenderFence.BeginFence();

It just never worked and the output errors are related to LNK2019 and LNK1120 :

2>     Creating library D:\Users\56485\Documents\Unreal Projects\VelocityDemo\Intermediate\Build\Win64\UE4Editor\Development\VelocityDemo\UE4Editor-VelocityDemo-0036.suppressed.lib and object D:\Users\56485\Documents\Unreal Projects\VelocityDemo\Intermediate\Build\Win64\UE4Editor\Development\VelocityDemo\UE4Editor-VelocityDemo-0036.suppressed.exp
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl FRHICommandListImmediate::ReadSurfaceData(class FRHITexture *,struct FIntRect,class TArray<struct FColor,class TSizedDefaultAllocator<32> > &,class FReadSurfaceDataFlags)" (__imp_?ReadSurfaceData@FRHICommandListImmediate@@QEAAXPEAVFRHITexture@@UFIntRect@@AEAV?$TArray@UFColor@@V?$TSizedDefaultAllocator@$0CA@@@@@VFReadSurfaceDataFlags@@@Z) referenced in function "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: void __cdecl FRenderCommandFence::BeginFence(bool)" (__imp_?BeginFence@FRenderCommandFence@@QEAAX_N@Z) referenced in function "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static enum ENamedThreads::Type __cdecl FRenderCommand::GetDesiredThread(void)" (__imp_?GetDesiredThread@FRenderCommand@@SA?AW4Type@ENamedThreads@@XZ) referenced in function "private: class TRefCountPtr<class FGraphEvent> __cdecl TGraphTask<class TEnqueueUniqueRenderCommandType<struct `public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)'::`2'::SceneDrawCompletionName,class <lambda_6990b626c546b10a41a4abd053c55940> > >::Setup(class TArray<class TRefCountPtr<class FGraphEvent>,class TInlineAllocator<4,class TSizedDefaultAllocator<32> > > const *,enum ENamedThreads::Type)" (?Setup@?$TGraphTask@V?$TEnqueueUniqueRenderCommandType@USceneDrawCompletionName@?1??CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z@V<lambda_6990b626c546b10a41a4abd053c55940>@@@@@@AEAA?AV?$TRefCountPtr@VFGraphEvent@@@@PEBV?$TArray@V?$TRefCountPtr@VFGraphEvent@@@@V?$TInlineAllocator@$03V?$TSizedDefaultAllocator@$0CA@@@@@@@W4Type@ENamedThreads@@@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static enum ESubsequentsMode::Type __cdecl FRenderCommand::GetSubsequentsMode(void)" (__imp_?GetSubsequentsMode@FRenderCommand@@SA?AW4Type@ESubsequentsMode@@XZ) referenced in function "public: static class TGraphTask<class TEnqueueUniqueRenderCommandType<struct `public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)'::`2'::SceneDrawCompletionName,class <lambda_6990b626c546b10a41a4abd053c55940> > >::FConstructor __cdecl TGraphTask<class TEnqueueUniqueRenderCommandType<struct `public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)'::`2'::SceneDrawCompletionName,class <lambda_6990b626c546b10a41a4abd053c55940> > >::CreateTask(class TArray<class TRefCountPtr<class FGraphEvent>,class TInlineAllocator<4,class TSizedDefaultAllocator<32> > > const *,enum ENamedThreads::Type)" (?CreateTask@?$TGraphTask@V?$TEnqueueUniqueRenderCommandType@USceneDrawCompletionName@?1??CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z@V<lambda_6990b626c546b10a41a4abd053c55940>@@@@@@SA?AVFConstructor@1@PEBV?$TArray@V?$TRefCountPtr@VFGraphEvent@@@@V?$TInlineAllocator@$03V?$TSizedDefaultAllocator@$0CA@@@@@@@W4Type@ENamedThreads@@@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class FRHICommandListImmediate & __cdecl GetImmediateCommandList_ForRenderCommand(void)" (__imp_?GetImmediateCommandList_ForRenderCommand@@YAAEAVFRHICommandListImmediate@@XZ) referenced in function "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) bool GIsThreadedRendering" (__imp_?GIsThreadedRendering@@3_NA) referenced in function "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class TAtomic<bool> GMainThreadBlockedOnRenderThread" (__imp_?GMainThreadBlockedOnRenderThread@@3V?$TAtomic@_N@@A) referenced in function "public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)" (?CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z)
2>CaptureManager.cpp.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) struct Trace::FChannel RenderCommandsChannel" (__imp_?RenderCommandsChannel@@3UFChannel@Trace@@A) referenced in function "public: void __cdecl TEnqueueUniqueRenderCommandType<struct `public: void __cdecl ACaptureManager::CaptureColorNonBlocking(class ASceneCapture2D *,bool)'::`2'::SceneDrawCompletionName,class <lambda_6990b626c546b10a41a4abd053c55940> >::DoTask(enum ENamedThreads::Type,class TRefCountPtr<class FGraphEvent> const &)" (?DoTask@?$TEnqueueUniqueRenderCommandType@USceneDrawCompletionName@?1??CaptureColorNonBlocking@ACaptureManager@@QEAAXPEAVASceneCapture2D@@_N@Z@V<lambda_6990b626c546b10a41a4abd053c55940>@@@@QEAAXW4Type@ENamedThreads@@AEBV?$TRefCountPtr@VFGraphEvent@@@@@Z)
2>D:\Users\56485\Documents\Unreal Projects\VelocityDemo\Binaries\Win64\UE4Editor-VelocityDemo-0036.dll : fatal error LNK1120: 8 unresolved externals

I can hardly find a proper way to righten this.

And when I compile the project that clones from this repo, no errors would appear. This really confused me. Looking forward to a reply :)