Unreal Engine Issues
Unreal Engine Issues
Lumen ignores Landscape Holes (Landscape Visibility) when Hardware Ray Tracing is enabled and Ray Lighting Mode is set to Surface Cache
UE - Rendering - Graphics Features - Ray Tracing - Jan 31, 2025Context Lumen is the default global illumination and reflections system. Lumen renders diffuse interreflection with infinite bounces and indirect specular reflections in large, detailed environments ...
TRASH_Comp in Octree that missing unregister
UE - Runtime - Character - Feb 25, 2025the reproduce video and project are in the slack links: Slack Link: [Link Removed] ...
Missing logging or error when applying an anim instance to a skeleton that the anim instance doesn't match.
UE - Runtime - Animation - Feb 9, 2026Currently, we detect whether an anim instance is supported by the skeletal mesh and, if it isn't, unreference the instance, but we don't error or warn the user that this happened. This leads to conf ...
Landscape Grass Type will not build with static lighting leaving 'Lighting needs to be rebuilt warning.'
UE - World Creation - Worldbuilding Tools - Foliage - Sep 3, 2015When using the Landscape Grass Type and using a Static or Stationary light will throw the 'Lighting needs to be rebuilt' warning. ...
Child Actor Component references are not sent to the Server through a Run on Server RPC
UE - Networking - Nov 9, 2015Child Actor Component references are not sent to the Server through a Run on Server RPC. Test project attached. Reproduced in 4.9.2 binary and Main (CL# 2758903). ...
Split Struct Pin on a Function output will return a compiler error
UE - Gameplay - Blueprint - Jan 13, 2015Split Struct Pin on a Function output will return a compiler error: Error Pin New Param 1 X named NewParam1_X doesn't match any parameters of function NewFunction_0 Error Pin New Param 1 Z name ...
Lightmaps on Mobile Devices Appear Dirtied and Pixelated
UE - Platform - Mobile - Jun 19, 2015Baked lighting on mobile has dirtied or pixelated lightmaps. When testing this issue I attempted to change various settings within the 'Lightmass' section and the changes made did not have much effe ...
"Play Rate" below 1 and "Force Fixed Frame Interval Playback" causes choppy renders
UE - Anim - Sequencer - Jul 12, 2016"Play Rate" below 1 and "Force Fixed Frame Interval Playback" causes choppy renders. This was explained by Max on Answerhub to the user, but this seemed like something that should be bugged and loo ...
ResavePackages commandlet with Build Lighting applies level transform each time
UE - Foundation - Core - Cooker - Sep 13, 2016While using the commandlet for RebuildPackages with -BuildLighting and having any sub-levels with level transforms will be added to the current position each time this commandlet is run. As an exa ...
FBX Scene Importer sets actors in Blueprint to movable when reimporting
UE - Editor - Content Pipeline - Import and Export - Nov 28, 2016When using the FBX Scene Import into Level with default settings so that the actors in the BP import as static, if you reimport them they will then be set to Movable in the BP. This is not a regre ...