Unreal Engine Issues
Unreal Engine Issues
Forward Rendering Lightmap Density view flicker
UE - Graphics Features - Aug 20, 2019The shaders flicker when in Lightmap Density viewmode after enabling Instanced Stereo Rendering in Project Settings > Engine > Rendering > VR Tested in 4.21.2 (CL - 4753647) 4.22.3 (CL - 7053647), ...
Directional light triggers 'too many overlapping lights' error in forward shading
UE - Graphics Features - Sep 24, 2019The underlying reason seems to be that the stationary lights require SM channels for casting shadows from movable objects and they are assigned channels 0,1,2 by lightmass (or somewhere along the w ...
Unreal Architecture link in Unreal Terminology website doesn't work
Docs - Apr 13, 2022Unreal Architecture web link doesn't work. A user cannot enter the website to see the terminology of the Unreal Architecture. ...
Alpha blending is done twice when using RenderOpacity of RetainerBox's parent slot
UE - Editor - UI Systems - UMG - Feb 10, 2023Licensee reported that alpha blending is done twice in the code below, and the fix below seems to fix it. .\Engine\Source\Runtime\UMG\Private\Slate\SRetainerWidget.cpp From:const FLinearColor Compu ...
PIE crash on infinite loop in a BP construction script
UE - Gameplay - Blueprint Runtime - Oct 19, 2023From the [Link Removed]: We had an issue where PIE was being stopped due to an "infinite loop" being detected in one of the blueprints construction script. This was also crashing the editor as the ...
Niagara NDC GPU Instance Counter leak
UE - Niagara - Jun 5, 2026In NiagaraDataChannelData.cpp, FNiagaraDataChannelDataProxy::EndFrame enqueues a GPU readback for each entry in PendingGPUReadbackBuffers, but the corresponding FNiagaraGPUInstanceCountManager::Free ...
Child actor components cannot be individually selected in viewport
UE - Gameplay - Blueprint - May 28, 2015If a child actor component is placed in a blueprint, that child actor component cannot be individually selected in viewport or scene outliner. ...
Editor crashes if reopened and a row is selected after moving datatablerow editor window in a csv data table
Tools - Apr 24, 2015If a user moves the row editor window in a csv datatable, then saves, closes, and reopens the editor, the editor will crash if the user then attempts to select a datatable row in the csv datatable w ...
Landscape LODDistanceFactor not applied to levels that were not loaded when it is changed
UE - LD & Modeling - Terrain - Landscape - Mar 13, 2015Landscape LODDistanceFactor is not applied to levels that were not loaded when it is changed. Sample content shows a landscape in this state. Other landscape properties probably suffer from this s ...
Tiled Landscapes imported with inverted Y axis rotation in World Browser
UE - LD & Modeling - Terrain - Landscape - Feb 23, 2015When importing tiled landscapes into the world browser, the landscape tiles appear with inverted Y axis rotations. ...