Unreal Engine Issues
Unreal Engine Issues
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 - CAPT - 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 - Graphics 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 ...
Significant hitch occurs when invoking ApplySettings on a UGameUserSettings object
UE - Rendering - Graphics Features - Jun 18, 2025Calling the ApplySettings method on a UGameUserSettings object results in a noticeable hitch, with severity proportional to the number of primitive components present in the scene. This hitch stems ...
Curve Atlas Row Parameter uses derivative ops when Texture Sample connected to curveTime input
UE - Rendering - Architecture - Materials - May 1, 2026When a Curve Atlas Row Parameter node is used with a Texture Sampler connected to the curve time input, the sample type uses derivative ops. This has negative performance implications for Nanite co ...
[Level Instances] Editor Actor Folders does a full refresh after any LI is loaded, leading to wasted time when bulk loading LIs for a given WP region load
UE - World Creation - Worldbuilding Tools - Level Instances - Jun 26, 2025From Licensee: We discovered a pretty big performance hit in editor when loading level instances for a world partition map, specifically: EditorActorFolders.cpp:FActorFolders::OnAllLevelsChanged() ...