Unreal Engine Issues
Unreal Engine Issues
Divergent group barriers in Lumen
UE - Graphics Features - Lumen - Apr 23, 2025Intel reported GPU crashes on their hardware caused by divergent group barriers in ScreenProbeConvertToIrradianceCS:[numthreads(THREADGROUP_SIZE, THREADGROUP_SIZE, 1)] void ScreenProbeConvertToIrra ...
Log message in ExclusiveLoadPackageTimeTracker is written incorrectly and means the opposite
UE - Foundation - Core - Oct 20, 2016A licensee has pointed out that a log message in ExclusiveLoadPackageTimeTracker at line 191 is saying the opposite of what it means. This is the line in question:UE_LOG(LogLoad, Log, TEXT(" ... ...
UWorld::RemoveFromWorld does not check Pointer Reference for null before use
UE - Gameplay - Dec 12, 2017The code in UWorld::RemoveFromWorld that removes Pawns that are about to be streamed out does not check to see if the pointer that it sets is null prior to using it. In cases where Pawns are rapidly ...
LLM: Delete LLM_IF_ENABLED if it is no longer a performance benefit, or convert all allocs and frees to use it if it still is.
UE - Foundation - Data Pipeline - Cooker - Nov 13, 2023The macros LLM and LLM_IF_ENABLED behave identically but are slightly different from a performance standpoint. For consistency all allocs and frees should use the same one. Measure the cost of a co ...
FTextLocalizationManager::UpdateFromLocalizationResource is discarding data
UE - Editor - UI Systems - Localization - Mar 1, 2016FTextLocalizationManager::UpdateFromLocalizationResource is loading LocRes data into a temporary, rather than loading it into a reference to an entry in LocalizationEntryTrackers. ...
Stale PerceptualData in AIPerceptionComponent
UE - AI - May 6, 2019Also, reported here: https://udn.unrealengine.com/questions/497277/stale-perceptualdata-in-aiperceptioncomponent.html ...
A crash can occur during a batched compile of inter-dependent Blueprint assets via commandlet.
UE - Gameplay - Blueprint - Feb 20, 2021Bulk compiling more than one Blueprint class asset without incurring a garbage collection pass in between each compile can result in a crash during reference replacement, as serialization may end up ...
Building for Gear VR Distribution fails due to missing Oculus lib
UE - Platform - XR - Jun 7, 2017Users have reported that building for Distribution on Gear VR results in failure due to a missing Oculus library. The error they receive is as follows: UATHelper: Packaging (Android (ETC2)): [javac ...
Crash on exit with NULL FTextRenderComponentMIDCache
Suggested fix is to relocate the Super::PreExit() call to the end of UGameEngine::PreExit() so that level streaming can be safely flushed before the MID cache is cleaned up. ...
Spline mesh crashing in FRayTracingDynamicGeometryCollection::AddDynamicMeshBatchForGeometryUpdate
UE - Graphics Features - Ray Tracing - Jan 31, 2025A crash occurs when using ray tracing with spline meshes preceded by the following ensure : Ensure condition failed: NumCPUVertices <= VertexBufferNumElements File: Engine\Source\Runtime\Renderer\ ...