Unreal Engine Issues
Unreal Engine Issues
Collision Problems on Meshes with Collision Complexity Setting UseComplexAsSimple
UE - Simulation - Physics - Dec 20, 2018Collision does not appear to work properly on a static mesh that is set up with UseComplexCollisionAsSimple. ...
Previous Tangent Recalc` and Size by Life misbehave at low FPS
UE - Niagara - Jun 18, 2019At low FPS particle systems with "Previous Tangent Recalculation" enabled in the Ribbon Data result in messy mesh generation. Found in 4.21 CL# 4753647, 4.22 CL# 6574378, 4.23 CL# 6925347, and 4.24 ...
Niagara Particles in Mesh Shape Don't Render in Scene or Editor Preview
UE - Niagara - Dec 19, 2019Niagara particles aren't rendered in the Niagara Editor Preview or the scene when an emitter is in it. Found in 4.24.1 CL#10756747 Reproduced in 4.25 Main CL#10808197 ...
[MetaSounds][Wave Player] - Looping sound waves is not sample accurate
UE - Audio - MetaSounds - Aug 8, 2022When playing the two metronome sounds, it is expected that when the 1bar asset loops, it will stay in time with the 12 bar asset; however, instead phasing begins to occur. This does not occur when ...
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 ...
Changing the value of a parent class variable does not update after hot reload
UE - Gameplay - Blueprint - Mar 4, 2015When the value of a variable defined in a parent class is changed inside of the child class, the value is not updated in a BP of the child after hot reloading. ...
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 ...