Unreal Engine Issues
Unreal Engine Issues
Lack of multi-bounce when using software traced lumen radiosity
UE - Rendering - Features - Lumen - Apr 4, 2025Certain Lumen Hardware Ray Tracing CVars, when disabled in isolation, will not fall back to tracing the Global Distance Field, because the Global Distance Field is still disabled. The function "Lum ...
Deleted custom event restricts name use on other fucntions/variables
UE - Gameplay - Blueprint - Jun 17, 2015If a custom event has been deleted, the name used on that custom event will not be able to be used on other functions/variables. This can be seen on the video posted here; [Link Removed] ...
Incorrect Shading On Objects Using World Position Offset And Rotate About Axis
UE - Graphics Features - Mar 1, 2017When using the rotate about axis node and WPO to move the vertices of an object to always face the player this seems to introduce some shading errors with any light (except skylight). ...
Division by zero in FAnimNode_StrideWarping::EvaluateSkeletalControl_AnyThread
UE - MVF Character - Animation - Sep 29, 2025When an Actor's CustomTimeDilation is 0.0, functions FActorTickFunction::ExecuteTick() and FActorComponentTickFunction::ExecuteTickHelper() will call AActor::TickActor() and UActorComponent::TickCom ...
Out-of-bounds read caused by improper return size from FSocketSteam::RecvFrom in Unreal Engine
UE - Online - Jun 7, 2021Overview: Function at fault: FSocketSteam::RecvFrom (https://github.com/EpicGames/UnrealEngine/blob/c3caf7b6bf12ae4c8e09b606f10a09776b4d1f38/Engine/Plugins/Online/OnlineSubsystemSteam/Source/Private/ ...
Incorrect WorldType causes crash in ULandscapeSplinesComponent::CheckForErrors
UE - LD & Modeling - Terrain - Landscape - Jun 21, 2018When adding a sub-level that contains a Landscape and Landscape Splines to an existing Level, it will cause a crash when building the lighting. This issue was reported in 4.18.3 (CL 3832480) and t ...
Material Ambient Occlusion Does Not Work With Skylight Set to Movable
UE - Graphics Features - Jul 27, 2018Material ambient occlusion does not work with the skylight set to movable. Setting the material to allow static lighting will fix the issue until the level is reloaded. Found in 4.19 CL# 4033788, 4 ...
CoreRedirects cannot be properly used to rename a BlueprintImplementableEvent that has a return value
UE - Gameplay - Blueprint - Dec 7, 2017Attempting to use CoreRedirects to rename a BlueprintImplementableEvent that has a return value results in the function not being renamed in the Blueprint subclasses and its Return Value nodes causi ...
The color picker stops working after changing the color once on a color property on a component
UE - Editor - UI Systems - Slate - Nov 13, 2019Changing the color on a component property via the color picker will cause the picker to stop working until it's closed and reopened. This occurs because a property change event is sent out, and the ...
Memory Leak in GetAccessAddress (PropertyAccess.cpp)
UE - Runtime - Animation - Jan 15, 2025[Link Removed] you own this I believe, see the UDN for details about the leak. The UDN as screenshots of what functions they made to create the leak. I was unable to actually get this code path ...