Unreal Engine Issues
Unreal Engine Issues
HiResScreenshot has incorrect masking when screenshot resolution scale does not match the viewport.
UE - Rendering Architecture - RHI - Sep 6, 2021After a bit of investigation, the way to fix this would be to modify MergeMaskIntoAlpha to pass in the actual resolution scale and the requested size, and only mask the overlapping pixels. Currently ...
[CrashReport] FScriptArray::ResizeTo() - UArrayProperty::DestroyValueInternal()
UE - Gameplay - Blueprint - Sep 28, 2017This is a slightly trending crash after the 4.17.2 hotfix, although it has occurred since 4.17.0. Users have not provided any description of their actions when the crash occurred. The callstack is ...
Surface Profile Skin shading has some unexpected stripe rendering issues
UE - Graphics Features - Apr 3, 2018So it looks like the artifact is definitely related to whether sss checkboard is enabled, but I can't reproduce it if enabling checkboard right after open the map, I mean it has to be reproduced aft ...
Incorrect Lumen Scene direct lighting when objects behind masked landscape
UE - Graphics Features - Lumen - Oct 5, 2025When objects are placed behind or beneath a masked landscape and r.Lumen.HardwareRayTracing.SurfaceCacheAlphaMasking is enabled, the direct light evaluation is incorrect. There are two workarounds, ...
Crash when saving a Data Table that is referencing itself in a Data Table Row Handle
Tools - Feb 23, 2017Crash when saving a Data Table that is referencing itself in a Data Table Row Handle. Reopening the project also causes a crash. *Regression: Yes This was fixed and working in 4.13-3037605 This i ...
VR billboard problems
UE - Platform - XR - May 3, 2018https://udn.unrealengine.com/questions/429242/419-psvr-dynamic-resolution.html "We are experiencing a rendering regression in PSVR when upgrading from 4.17 to 4.19. A MaterialBillboardComponent tha ...
Simulated physics bodies not working properly with BP Move Component To node
UE - Simulation - Physics - Jun 5, 2015This issue may reference [Link Removed] which was recently fixed with 4.9 CL-2553675. When using the MoveComponentTo node physics do not work properly compared to other methods to move a component ...
BulkData Async loading remains in memory
UE - Foundation - Core - Oct 26, 2016Gil's new loading path may already walk away from this issue. But here's some thing I tested locally if we want to fix this. A simple way to fix is to simply add BulkDataAsync.Deallocate(); ResetA ...
Editor Crashes on Opening After Deriving C++ Class from Another Class
UE - Foundation - Cpp Tools - Hot Reload - Sep 13, 2017After deriving a C++ class from another class and then closing the editor, the project will crash when reopened. This crash will continue until the project files are regenerated and the project is r ...
VC Runtime not in UnrealLightmass temp directory; causing lightmass build errors
UE - Foundation - Cpp Tools - UnrealBuildTool - Oct 14, 2015A Redistribute file for VS 2015 is needed to build lightmass, but this is not currently included with the engine. If a user does not have VS 2015 installed, lightmass will fail with this error: Un ...