unreal-engine4

I got an error while or after iterating over a mongocxx::cursor after finding some documents in my database. I am using Windows 10, Unreal Engine 4.16.1 and mongodb cxx 3.1.1. The database connection is set up correctly, the find function finds my documents and returns a valid cursor. It ends up in this Exception: Exception thrown at 0x00007FFDED56B698 (UE4Editor-Core.dll) in UE4Editor.exe: 0xC0000005: Access violation writing location 0x0000000000000010. with this output: 2598:0a50 @ 01781390 - LdrpCallTlsInitializers - INFO: Calling TLS callback 00007FFDDC66C154 for DLL "C:\WINDOWS\System32

This applies to Unreal Engine 4.9 Each frame, I'd like to save it to file (overwriting the existing one). For a simple D3D11 demo that I have made, I've been able to do this with: void Engine::CaptureFrame(D3DX11_IMAGE_FILE_FORMAT format, const LPCTSTR fileName){ backbuffer->GetResource(&resource); ID3D11Texture2D* texture; HRESULT hResult = resource->QueryInterface(__uuidof(ID3D11Texture2D), reinterpret_cast<LPVOID*>(&texture)); D3DX11SaveTextureToFile(deviceContext, texture, format, fileName); //Clean up texture->Release(); resource->Release(); } I have done this with OpenGL, too, using a

I am trying to read the pixel data from a populated UTexture2D in an Unreal Engine C++ project. Before I post the question here, I tried to use the method described in this link: https://answers.unrealengine.com/questions/25594/accessing-pixel-values-of-texture2d.html . However, it doesn't work for me. All pixel values I got from the texture are some garbage data. I just want to get the depth values from the SceneCapture2D and a post-processing material that contains SceneTexture: Depth node. I need the depth values available in C++ so that I can do further processing with OpenCV. In Directx11

I want to use async/await syntax in C++ (UE4 framework), but due to cross-platform code I not sure that is possible... Or possible? If yes, how can I use it? And also there are await and __await ( resumable , yield and __yield_value also) keywords that highlighted in Visual Studio. What's difference? Maybe not all compilers supports this keywords or supports separately? gcc , clang are accepts it? Or not accepts and I can just use macros for each platform individually. async and await are language extensions proposed by Microsoft with several revisions, but current is N4134 . This has not yet

I am trying to encode a video in Unreal Engine 4 with C++. I have access to the separate frames. Below is the code which reads viewport's displayed pixels and stores in buffer. //Safely get render target resource. FRenderTarget* RenderTarget = TextureRenderTarget->GameThread_GetRenderTargetResource(); FIntPoint Size = RenderTarget->GetSizeXY(); auto ImageBytes = Size.X* Size.Y * static_cast<int32>(sizeof(FColor)); TArray<uint8> RawData; RawData.AddUninitialized(ImageBytes); //Get image raw data. if (!RenderTarget->ReadPixelsPtr((FColor*)RawData.GetData())) { RawData.Empty(); UE_LOG