Unreal Engine Issues
Unreal Engine Issues
Foliage Painted on BSP is Deleted after Building Geometry
UE - World Creation - Worldbuilding Tools - Foliage - Dec 15, 2014After painting foliage meshes on a BSP surface and rebuilding the level (more specifically the geometry), the meshes are deleted. This bug is especially nasty because you cannot Ctrl+Z after buildi ...
Custom Events can't be called after changing level blueprint or switching maps
UE - Gameplay - Blueprint - Dec 23, 2014Custom events cannot be called as functions after being made in level blueprints or after changing levels. User must close and re-open editor to be able to call a custom event. ...
Slider doesn't properly bubble the OnKeyDown event
UE - Editor - UI Systems - Apr 7, 2016Once a slider receives keyboard focus, the keys will not navigate away regardless of the navigation settings. This is because the slider's OnKeyDown function does not pass along the call when the ev ...
Users custom AI-heavy project crashes if anything is Built
UE - Gameplay - Feb 2, 2015Users custom AI project crashes if anything is Built. (All, Lighting, Geometry, etc.) The project can be played but receives a message during play that the Navmesh needs to be rebuilt. ...
RoutePointerUpEvent in SlateApplication doesn't check if a drag is occurring for touch events
UE - Editor - UI Systems - Slate - Aug 15, 2016When SlateApplication is routing a pointer up event, it should check bIsDragDropping and call the widget's OnDrop function. Currently, we check for touch events and call OnTouchEnded without checkin ...
OnUrlChanged does not fire on mobile
UE - Platform - Mobile - Sep 28, 2017When using On Url Changed event on mobile devices, the event does not appear to fire as expected. Tested on iphone 5 As a note: The function GetUrl appears to be similarly affected. ...
FBX export - BP StaticMesh Scales from Mesh Origin
Tools - Dec 13, 2018Unexpected behaviour with meshes scaled via BP and exported via .fbx (.obj looks to function as expected) Confirmed in 4.22 Main CL 4648854 ...
Rounding errors are present in FJsonValue::TryGetNumber(int64&) and FMath::RoundHalfFromZero()
UE - Foundation - Core - Mar 8, 2019A licensee reported a bug in rounding of a call to FJsonValue::TryGetNumber(int64&) with large values. In investigating this, it appears that equivalent problems also exist in FMath:: rounding func ...
ARCore: Handheld AR Template doesn't handle background/resume correctly
UE - Platform - XR - Jul 23, 2021When the new template gets backgrounded and resumed, the app might not be fully functional at resume time. Sometimes the plane detection doesn't work. Sometimes the camera goes down. It's not very ...
Flickering shadows/GI when DrawMaterialToRenderTarget is called per tick in PIE
UE - Rendering Architecture - Jul 11, 2024When DrawMaterialToRenderTarget function is called on tick and actors are spawned in game, the lumen shadow/GI visually flickers. Debugging shows that the lumen screen probes are flickering as well. ...