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. ...
Mesh blueprint has incorrect Scaling in viewport when added as a child blueprint component
UE - Gameplay - Sep 9, 2015If the user converts two static meshes in the level to blueprints, makes them movable, and then adds one to the other as a child blueprint component then the child component will scale incorrectly i ...
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 ...
Mesh Painting sometimes fails to paint the closest face in the hovered area
Tools - Oct 10, 2016Sometimes it's not catching certain polys as vertex paint targets. Looks like it happens when there's more than one layer of forward facing geometry over the highlighted area, and it just takes the ...
Using a custom #define as the condition for a UFUNCTION's declaration will cause the function to not show in blueprints
Using a custom #define as the coniditon for an #if / #endif that encapsulates a UFUNCTION that is marked as BlueprintCallable will prevent it from being visible in blueprints despite the #if resolvi ...
Skewed Rotation values from camera actors in print string
UE - Gameplay - Sep 25, 2017When using the camera actor and modifying the rotation values, the values made in the print string do not seem to match the actual values of the camera's rotation. The values appear to be close, but ...
Curves in compressed additive animations interpolate incorrectly when two keys in a row have the same value
OLD - Anim - Oct 16, 2019Curves compressed from additive animations will not interpolate correctly if they have two keys in a row with the same value. The second key will be ignored, leading to the curve interpolating earli ...