Unreal Engine Issues
Unreal Engine Issues
Performance slowdown when ray tracing is disabled due to SetResidencyPriority
UE - Rendering Architecture - 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 ...
Crash when exporting Static Meshes as an FBX (UE4Editor-SlateCore.dll!SWidget::OnQueryShowFocus)
Tools - Sep 21, 2017Possibly related to [Link Removed] ...
Crash on Device when Deploying Mobile Project with Modulated Shadows and Planar Reflections on iOS 9
UE - Platform - Mobile - Jan 6, 2017A crash occurs on iOS when deploying the licensee's project using iOS 9 version. The crash does not occur when deployed to a device using iOS 10 version. They believe the crash to be related to Pl ...
Bad references for Lighting Scenarios when moving Levels and Map Build Data Registry to different Folder
Tools - Feb 2, 2017When moving Lighting Scenario Levels and their associated Map Build Data Registry to a new folder within the Content Browser, the references within the Levels tab are updated as [MapName_BuiltData]. ...
Subsurface Profile Materials That Are Illuminated By Particle Lights Render White
UE - Graphics Features - Feb 9, 2017Due to the changes made to subsurface profile (implementation of full resolution skin shading) it now renders white or with heavily faded base colors under certain conditions. In this case it is wh ...
Hierarchical and normal Instanced Static Mesh Components do not maintain PerInstanceRandom values when transforms are modified
UE - Graphics Features - Nov 6, 2017When using PerInstanceRandom in a material that is applied to a Hierarchical or normal Instanced Static Mesh component, there are issues of the value resetting when certain transform operations are ...
Bug - Animations and Keep State Fail when scrubbing backward.
UE - Anim - Sequencer - Jan 30, 2020If you scrub past an animation with keep state, and scrub into an animation with defaults everything is fine. When you scrub back to the animation with keep state, the animation breaks, until there ...
Color space transform in the UI composition is incorrect on DX12 HDR (r.HDR.UI.CompositeMode=1)
UE - Graphics Features - Jun 11, 2021Color space conversion in the UI composition is incorrect on DX12 HDR. In the main() function In CompositeUIPixelShader.usf, you can see the following color space transform.// sRGB -> RRT -> ODT ...
USplineComponent::GetDistanceAlongSplineAtSplineInputKey returns incorrect result when input keys are not sequential
UE - Editor - Workflow Systems - May 18, 2022USplineComponent::GetDistanceAlongSplineAtInputKey() returns the wrong value when the input keys are not sequential because it interprets the input key argument as the spline point index. Thus if th ...
Electra video playback fails if project or package is under multibyte characters path
UE - Media Framework - Sep 16, 2022The URL parser encodes the input path to a URL-encoded path even if it is local, so if the path contains unicode characters (such as Japanese Kanji ), the media file cannot be read. Following worka ...