Unreal Engine Issues
Unreal Engine Issues
Material does not render correctly when launched with Cook on the fly
UE - Rendering Architecture - Shaders - Nov 8, 2021This issue seems to occur when using Cook on the fly on a Material that is branched on the Static switch. This issue also seems to occur on the console. Regression = Yes, issue is not reproduced // ...
Last frame pose is not evaluated when playing Anim Montage with Blend Out Time of 0 in AnimNodeSlot
UE - Anim - Gameplay - Apr 26, 2022When playing AnimMontage with BlendOutTime set to 0.f with AnimNode_Slot of AnimBP, it seems that the last frame pose may not be evaluated. this issue does not occur in high frame rate and does not ...
Assert triggering when trying to copy-paste an empty CurveAtlasRowParameter node in the material editor
UE - Rendering Architecture - Materials - Mar 25, 2024A check happens when copy/pasting a Curve Atlas Row Parameter Expression that has no value. This behavior also exists on CL 32426910 of Release-5.4. ...
Cross does not respond or crashes when "collide with attached children" is enabled
UE - Simulation - Visual - Apr 13, 2021Fatal error! Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000000 0x00007ffb09d32bb9 UE4Editor-Engine.dll!USkeletalMeshComponent::CopyClothCollisionsToChildren() [D:\ ...
Montage Time Stretch Curves Scale Incorrectly
UE - Anim - Runtime - Apr 13, 2022More details in attached UDN [Link Removed] Time stretch curve behaves incorrectly with large sections of in-between values. From the UDN: After using the feature a bit more we also noticed tha ...
Foliage is placed on LevelInstanceActor does not follow basecomponent when the LevelInstanceActor moves
UE - World Creation - Worldbuilding Tools - Foliage - Jun 24, 2022Foliage usually follows when the Transform of the placed ground or floor changes. However, if the ground or floor is a Level Instance Actor, it will not follow. The cause is in the code below. voi ...
Cannot set background color for UI Domain material preview
UE - Editor - UI Systems - UMG - Dec 18, 2023CSM Shadows disappearing at larger coordinates with different FOVs
UE - Graphics Features - Shadows - Apr 5, 2024Cascaded shadows disappear at some FOVs when far from the world origin. This behavior was not present in 5.2. Also found in CL: 32690246 in Release-5.4 ...
Artifacts appear on translucent particle systems during camera motion blur
UE - Rendering Architecture - Jul 23, 2025Translucent particle systems exhibit visual artifacts when the camera moves, even though motion vectors are disabled for the particle emitters. While switching the Translucency Pass to "After Motio ...
PlayerCollision visualization incorrect on LandscapeSplineMesh when Nanite is enabled
UE - Graphics Features - Nanite - Dec 3, 2025From licensee: I’ve found an issue with the visualization of PlayerCollisions when using LandscapeSplineMesh with a mesh that has Nanite enabled. The Chaos collisions shown in the Chaos Visual Debu ...