Unreal Engine Issues
Unreal Engine Issues
Interaction between sublevels and LevelSequences can break actors attachments hierarchy of the sublevel.
UE - Engine Scaling - Streaming - Aug 6, 2025Having a LevelSequence opened and unhiding a sublevel can break the attachment hierarchy of the actors that are inside the sublevel. This also affects to the sublevel asset itself. ...
DataLayer: Duplication a GroupActor is broken
UE - Engine Scaling - Streaming - Data Layers - Aug 5, 2025The result of the duplication operation is that the Actors in the new group are part of the DataLayer but the new GroupActor is not. ...
SSR doesn't reflect Skydome Mesh/Material correctly in Vulkan mobile preview
UE - Platform - Mobile - Systems - Aug 4, 20255.6[Image Removed] 5.5[Image Removed][Link Removed] ...
Hardware Raytracing on Lumen can cause a crash on AMD Radeon GPUs
UE - Rendering - Features - Lumen - Jul 29, 2025Hardware Raytracing support can cause a crash on AMD Radeon GPUs when creating the RT pipeline state. ...
Unloading a World Partition region during nested Level Instance inline editing prevents exiting editing mode
UE - Engine Scaling - Streaming - Level Instances - Jul 28, 2025In the case of a single-layer Level Instance, actors are still referenced even when the region is unloaded. However, in the case of nested Level Instances, the level being edited is discarded when t ...
Merge Actor - Approximate Actors algorithm is using Mesh Description directly rather than the Nanite parameters
UE - Engine Scaling - Streaming - 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 ...
Player collision display not accurate with DirectX12 enabled
UE - Rendering - Features - Nanite - Jul 24, 2025Artifacts 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 ...
Unable to change Actor Coloration View Modes in PIE
UE - Engine Scaling - Streaming - 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 ...
Performance slowdown when ray tracing is disabled due to SetResidencyPriority
UE - Rendering - RHI - Jul 17, 2025When a game is compiled with ray tracing disabled (D3D12_RHI_RAYTRACING=0) and the GPU the game is running on becomes low on VRAM, frame time is negatively impacted and doesn't recover. The D3D12_RH ...