Unreal Engine Issues
Unreal Engine Issues
HasVertexPositionOffsetConnected returns true even if WorldPosition output isn't connect to output
UE - Rendering - Architecture - Materials - Aug 25, 2026FMaterialCachedExpressionData::UpdateForExpressions iterates on all expressions, even for those that are not enabled in a material instance or not even connected to output. This will enable features ...
Scalebox scaling won't update if child size changes with global invalidation enabled
UE - AI Workflows - UI Systems - Slate - Jul 17, 2024When global invalidation is enabled, Scale Boxes don't react properly to changes in the size of their contents. Licensees have worked around this by updating SScaleBox::OnArrangeChildren:// This sca ...
In the GameUserSettings class, Landscape quality is not taken into account by GetOverallScalabilityLevel, but is changed by SetOverallScalabilityLevel.
UE - Gameplay - Oct 17, 2025Context: GameUserSettings stores user settings for a game, for example graphics and sound settings. The Scalability settings provide a way for to adjust the quality of various features in order to m ...
Visibility track key value is no longer the inversion of the bound bHidden property
zComponent - Archive - May 13, 2026Regression introduced in UE 5.7. Works correctly in UE 5.6. Up to UE 5.6, the bool value written to the Visibility track's BoolCurve was the inversion of the underlying bound property (e.g. AActor: ...
Depth reading features on devices without framebuffer fetch are relying on undefined behaviour.
UE - Platform - Mobile - Oct 26, 2016For devices without framebuffer fetch we are relying on undefined behaviour for depth reading with decals, mod shadows and depth reading materials. (ES2 spec: 3.8.6 Texture Framebuffer Attachment). ...
Inline retargeting gives different output pose vs retargeting from mesh
UE - ACT Character - Retargeting - Nov 19, 2025When we perform a retarget from an input pose rather than another mesh, the transforms within the anim bp have already been conformed to the target mesh by translational retargeting and compatible s ...
Review/unify dithering and fading systems
UE - Graphics Features - Jan 25, 2016High priority item: "Hi guys, I was looking to a GPU capture of our foliage and all draws were set with the KILL_ENABLE register enabled. This register force off Early Z rejection since the GPU ha ...
Undo Crash with Reroute node into Class pin of SpawnActorFromClass
UE - Gameplay - Blueprint - Sep 4, 2018Crash on undo with SpawnActor node that uses a reroute pin in class wire. "It looks like the variable promotion marks the blueprint as structurally modified, which triggers a skeleton compile, wh ...
GPU ISM LOD doesn't take into account per instance scales when calculating LOD ranges
UE - Rendering - Features - Jul 19, 2024When we set up the draw calls for ISM with GPU LOD selection we submit a draw call per LOD. For this we calculate the minimum and maximum possible LOD with a call to ComputeLODForMeshes() in FReleva ...
UnrealCEFSubProcess requires Visual Studio 2013 to be compiled
UE - Foundation - Cpp Tools - UnrealBuildTool - Oct 21, 2016When trying to build the entire engine solution or UnrealCEFSubProcess directly, Visual Studio 2013 is required to be installed for UnrealCEFSubProcess to complete successfully. There is also an err ...