Unreal Engine Issues
Unreal Engine Issues
Unable to save a map file when editing a LevelInstance by placing multiple LevelInstances on a PersistentLevel
UE - World Creation - Worldbuilding Tools - Level Instances - Mar 17, 2023Can not save the map file, if trying to edit a LevelInstance in a PersistentLevel where multiple LevelInstances are placed. The workaround is to open and edit the LevelInstance as PersistentLevel. ...
Lumen indirect lighting artifacts when far from world origin
UE - Graphics Features - Lumen - Feb 6, 2024Lumen seems to not be using Large World Coordinates somewhere. The Lumen Scene develops artifacts at large distances (5000 KM) from the world origin. ...
UV Offset Effect Material in RetainerBox Causes Visual Artifacts in Editor Preview
UE - Editor - UI Systems - UMG - Apr 22, 2025When a UV Offset is applied in a RetainerBox effect material, visual artifacts appear only in the editor — not at runtime — if a widget with a dotted preview outline (like CanvasPanel) is placed dir ...
Transforming inherited component in editor will crash
Tools - Mar 6, 2015When a component inherited from code is transformed in any way with the viewport controls (arrows, rotation sphere, scale boxes) the editor will crash. Using the value boxes to set the transform do ...
Editor crash after attempting to create layer info in new landscape window
UE - LD & Modeling - Terrain - Landscape - May 7, 2015Attempting to create landscape layer info from within the new landscape creation window crashes the editor. Workaround: create the landscape, switch to paint mode, create layer info in paint mode w ...
20 FPS performance drop between 4.7.6 and 4.8 on devices rendering Metal only
UE - Platform - Mobile - Jun 22, 2015User reported a considerable performance drop on iOS between versions 4.7.6 and 4.8. I was able to reproduce this perf drop using the steps he provided. ...
Fix SourceLength to be tangent to spot light axis
UE - Graphics Features - Mar 4, 2015Rotated component made into root displays incorrectly in the blueprint editor
UE - Gameplay - Blueprint - Jan 25, 2017Rotated component made into root displays incorrectly in the blueprint editor. Closing and reopening the BP editor corrects the displayed root component. ...
Mobile Preview - Custom Stencil 4.23 Regression
UE - Platform - Mobile - Oct 25, 2019Regression when using custom stencil with in-editor mobile preview. This does NOT reproduce in MAIN at CL 9730599 ...
Depth Not Rendered Correctly When Using CustomProjectionMatrix in SceneCaptureComponent2D
UE - Graphics Features - Apr 15, 2020The depth is rendered incorrectly when using a custom projection matrix in SceneCaptureComponent2D. You can find an example project at [Link Removed]. You can find where the CustomProjectionMatrix ...