Unreal Engine Issues
Unreal Engine Issues
Performance drop when spawning AI actors during runtime compared to placing them in world
UE - AI - Jan 9, 2019There is a performance difference between spawning and placing AI into a level. This is causing issues when spawning/despawning AI actors in a large open world, where 4-5ms of frame time quickly bui ...
Flipping faces on a brush affects all other brushes
UE - LD & Modeling - Modeling Tools - BSP - Apr 9, 2015Flipping faces on a brush affects all other brushes Subtractive brushes will have their internal faces show if enough additive brush faces are flipped. If the faces of a subtractive brush are flip ...
Crash closing editor with blueprint thumbnails visible in Content Browser
UE - Editor - Content Pipeline - Content Browser - Jul 28, 2016Crash occurs when the user closes the editor while there are blueprint thumbnails visible in the Content Browser. This seems to only occur if the editor was opened with blueprint thumbnails also vi ...
[CrashReport] UE4Editor_Engine!FDistanceFieldAsyncQueue::Build()
UE - Graphics Features - Jul 24, 2017This is a common crash callstack that has affected more than 300 unique users since at least the 4.11 release. Other Jiras in the past with similar callstacks include [Link Removed] and [Link Remo ...
Niagara Dynamic Parameters do not reflect layers in material instances.
UE - Niagara - Jan 19, 2022The names of dynamic parameters in material layers do not seem to update from material instances. ...
Deploying from Windows to Linux fails on the first attempt
UE - Platform - Linux - Aug 3, 2017After hitting this failure, if you try to deploy again, then it will work. This only occurs on the first attempt. Initially, I thought I hit a disc space issue I was hitting due to having a sample ...
UWorldPartitionSubsystem::IsStreamingCompleted returning the wrong query result when all cells and actors in location are in DataLayers
UE - World Creation - Worldbuilding Tools - World Partition - Jul 24, 2025Context: Data Layers is a system within World Partition used to organize Actors both in the Editor and at runtime. It allows for the user to dynamically load and unload layers in the Editor to help ...
Nodes impacted by code changes do not generate warnings after HotReload
UE - Gameplay - Blueprint - Oct 20, 2016I noticed this while executing https://jira.it.epicgames.net/browse/UEQATC-1441. At step 10, there should be warnings on the nodes that were updated by the HotReload. This is a regression from 4.13 ...
"Create Layers From Assigned Materials" assigns existing LayerInfos at random
UE - Graphics Tools - Terrain - Landscape - Jan 17, 2025The automatic landscape layer assignment that is performed when using "Create Layers From Assigned Materials" just uses the first layer info it finds with the layer's name, which leads to maps refer ...
Some Niagara FX does not show up in MovieSceneCapture when AgeUpdateMode is DesiredAgeNoSeek
UE - Niagara - Cinematics - Sep 17, 2024CL23957356 changes how to calculate FrameOffset in FNiagaraSystemUpdateDesiredAgeExecutionToken::Execute(). After this change, DesiredAge + FrameOffset could be 0.0 for some a couple of initial fram ...