Unreal Engine Issues
Unreal Engine Issues
Collision lost from body when using world composition and streaming
UE - Runtime - Simulation - Mar 1, 2021Physics object from a streamed level does not interact with other physics objects in persistent level. ...
Platform-specific defines not picked up by Intellisense
UE - Core - Cpp Tools - UnrealBuildTool - Aug 31, 2022With the way PLATFORM_XSX, PLATFORM_PS5 etc. are defined, it seems intellisense doesn't know about them, because the .vcxproj only references the Win64 version of Definitions.h, and they are defined ...
FMaterialResource::IsDualBlendingEnabled bug
UE - Rendering - Architecture - Materials - Jul 24, 2023The user has a proposed fix for this in the case. FMaterialResource::IsDualBlendingEnabled needs the following modification that includes MaterialInstance check: bool bMaterialRequestsDualSourceBle ...
Crash in FPipelineFileCacheManager::RegisterPSOStats
UE - Rendering - Architecture - Oct 25, 2024The game can crash when one thread clears RunTimeToPSOUsage while another thread is expecting it to contain a PSO it is registering stats for. Thread A: calls CacheGraphicsPSO() Thread B: calls C ...
The visibility state of on-screen stat messages is not restored correctly after entering and leaving PIE. This also affects other important on-screen messages like map warnings and debug messages.
UE - AI Workflows - UI Systems - Nov 28, 2024Currently, the ShowStats viewport option is automatically enabled when entering PIE and automatically disabled when exiting PIE. This forced disabling happens even if the option was enabled prior to ...
Changing the scale of a single HISM instance greatly affects the LOD selection of all instances
UE - Rendering - Architecture - Sep 22, 2025When using ISMs and HISMs, each instance can have its own transform, which can affect the LOD selection of one or more instances. For HISMs in particular, changing the scale of a single instance gre ...
FDetailGroup::AddGroup does not correctly apply the default expansion state for DetailGroups
UE - Editor - Verse Class Editor - Feb 10, 2026There is a bug affecting DetailGroups in the engine. When adding child DetailGroups to a parent DetailGroup, the expansion state does not behave as expected and ignores the flags intended to control ...
RHIGetAvailableResolutions returns duplicate entries when bIgnoreRefreshRate is false
UE - Rendering - Architecture - RHI - Sep 17, 2015When the RHIGetAvailableResolutions function fills the array that is passed in as the first argument, it will end up filling some slots with duplicate resolutions (including refresh rate) when the b ...
Failure while Cooking FOutputDeviceWindowsError::Serialize()
UE - Foundation - Core - Cooker - Mar 19, 2015User receives an error while packaging. I haven't been able to reproduce this on my machine with templates I've created. Method to package: File > Package Project > Win64 The logs are attached. ...
Changing the mobility of an actor attached to a Skeletal Mesh in the level will change the mobility of the skeletal mesh
UE - Gameplay - Feb 16, 2016Items attached to the Skeletal Mesh in the World Outliner can alter the Mobility of the Skeletal Mesh. Licensee specifically does not want to have any automated changes to asset mobility to happen ...