Unreal Engine Issues
Unreal Engine Issues
Merge Actor - Approximate Actors algorithm is using Mesh Description directly rather than the Nanite parameters
UE - World Creation - Worldbuilding Tools - Merge Actor - Jul 25, 2025In an ideal world, all mesh merge algorithms should have the option to use as input one of the followingRender mesh (non-nanite) (+ the option to target a specific LOD)Mesh Description (+ the option ...
SynchronizeWithExternalDependencies can cause soft lock with Pose Search DDC tasks during cook
UE - Anim - Gameplay - Jul 25, 2025SynchronizeWithExternalDependencies will call Modify on the Pose Search Database when the database has changed. This will call FAsyncPoseSearchDatabasesManagement::OnObjectModified which in turn ma ...
ULevelSequence trying to duplicate a REINST_ class when creating new custom binding in ConvertOldSpawnables()
UE - Framework - Blueprint Compiler - Jul 23, 2025The assert that we're hitting is:Cannot replace existing object of a different class. New Object: /Engine/Transient.REINST_BPC_NPC_VFX_C_230 /Game/Maps/[REDACTED]/Levels/[REDACTED]/LevelSequence/ ...
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 ...
Custom Primitive Data color widget not applying correctly to static mesh components in Blueprint editor.
UE - Rendering Architecture - Materials - Jul 23, 2025Context Custom Primitive Data is used to store custom data in an index array that is accessible through Blueprint and code. This allows for variations across instances of the same mesh without needi ...
The speed and delay of Animators is increased in exports when the scene contains 3D Grass
TM - Rendering - Jul 23, 2025Reported in SF [Link Removed] For animators (translators and rotators), when the scene contains the 3D Grass materials, videos exported from the scene will display animators delay and speed up abou ...
Farfield shadow in lumen scene
UE - Graphics Features - Jul 21, 2025Shadows in the Lumen Scene from Lumen's Direct Lighting do not match the world when in the Lumen Far Field. This leads to shadows where there should not be any, and missing shadows where there shou ...
Montage Editor: Mouse Wheel Cannot Scroll to the Bottom of notify section when there are many track.
UE - Anim - Runtime - Jul 21, 2025When a large number of notify tracks are added in the Montage Editor, the mouse wheel scroll does not allow the user to reach the bottom-most tracks. Only by manually dragging the scrollbar can the ...
Unable to change Actor Coloration View Modes in PIE
UE - World Creation - Worldbuilding Tools - Jul 20, 2025When in PIE changing Actor Coloration view modes from the viewport visualisation mode [Liit] -> [Actor Coloration] -> ... Does not update correctly when switching view mode and sometimes isn't corr ...
Soft angular constraints solve velocity like hard constraints
UE - Simulation - Core - Jul 17, 2025Soft angular constraints are solving velocity like hard constraints. Instead of swinging back and forth, the affected body just snaps to 45 degrees. Check the steps to reproduce for more details. Th ...