Unreal Engine Issues
Unreal Engine Issues
RecastNavMesh is not generated at loaded sublevel
UE - AI - Aug 16, 2018RecastNavMesh is not generated at the sub level dynamically added in C ++ in 4.20. In 4.18, 4.19 it was generated normally. Probably, changes to the large number about NavMesh systems from 4.19 to ...
"Move to Level" of Landscape Tool leads component scale mismatch
UE - Graphics Tools - Terrain - Landscape - Feb 12, 2026In UE 5.7.2, when moving a Landscape Component to a sub-level using Landscape Mode > Manage > Move to Level, the proxy transform is not synchronized with the root Landscape when the KeepWorldTransfo ...
Camera Rotation Not Working With Mouse if Mouse Cursor is Shown
Tools - Apr 11, 2016When the mouse cursor is shown, and you press eject in the viewport, you can no longer rotate the camera while holding right click and moving the mouse. If you hide the mouse cursor using the Show ...
Fix PrimitiveComponent overlap indirection
UE - Simulation - Physics - Sep 27, 2016When doing overlap tests in PrimitiveComponent, UWorld->ComponentOverlapMulti is used. The callstack for that ends up looking like this (callstack is inverted, highest level on top): UWorld::Compo ...
[Feature Request] New InstancedStaticMeshComponent API: Add Multiple Instances
UE - LD & Modeling - Terrain - Landscape - Oct 24, 2019Licensee says that adding multiple InstancedStaticMeshComponent instances can be very slow (main bottleneck being the physics building). I think there's a good case for a method something like: ...
Crash occurs when renaming an asset that is used by Class Default Object
UE - Core - Systems - Nov 23, 2021Not a regression. Tested in: //UE4/Release-4.26.2 CL15973114 Binary - Reproduced //UE4/Release-4.27.1 CL17735300 Binary - Reproduced //UE5/Release-5.0-EarlyAccess CL16682836 Binary - Reproduced Fro ...
Muting the top most track row is muting all track rows
zComponent - Archive - Jan 27, 2023The workflow above is generally used to pull out key poses from a mocap performance. It works on 5.0. It can be simplified for QC into this:add some animation keys to your rigged character in Sequ ...
Enhanced Input duplicately fires input event when used in Widgets.
UE - Gameplay - Input - Jun 9, 2023When creating a UserWidget and creating a process to receive input events with Enhanced Input, input events may be generated multiple times in duplicate. To reproduce this problem, create a Widget a ...
Editor 'Build All Levels' discards Volumetrics Lightmaps in persistent level
UE - Rendering - Features - May 14, 2025Building the level or lightmaps can clear the volumetric lightmap. In 5.5, this requires you to perform a full build, or a lighting only build with a BSP brush in the scene. In 5.6, all level build ...
UE4Editor does not start when there are no audio devices available
UE - Platform - Linux - Sep 26, 2018UE4Editor does not open when there are no audio input or output devices available. The editor hangs at 83% after it initializes the AudioMixer. This issue looks like it was caused by CL 4396954. Et ...