Unreal Engine Issues
Unreal Engine Issues
Breaking level instances does not adequately fix up actor references
UE - World Creation - Worldbuilding Tools - Level Instances - Aug 29, 2022Details in link. ...
Multi-process cooking does not complete in UE5.3.0
UE - Foundation - Data Pipeline - Cooker - Sep 26, 2023Projects with multi-process cooking enabled will not complete packaging. If MPCook is disabled, packaging can be completed. ...
Landscape Transparent with r.Lumen.DiffuseIndirect.Allow 0
UE - Graphics Tools - Terrain - Landscape - Jul 31, 2024CopyTask in BuildGraph never throws an exception if the copy fails
UE - Foundation - Horde - BuildGraph - Feb 28, 2023CopyFile function in CommandUtils.cs assumes that an exception will be thrown if the number of retries is exceeded, but the loop condition prevents it from being thrown. Following fix works:publics ...
Material slot assignment incorrect after mesh reduction completely removes all triangles from a section
When mesh reduction results in a section becoming empty, the material slots are incorrectly assigned. e.g. if section 0 gets removed due to it having no triangles after reduction, then its material ...
[CrashReport] UE4Editor_Engine!UMaterialExpression::GetOutputType() [materialexpressions.cpp:859]
UE - Rendering Architecture - Materials - Nov 21, 2017This is an infrequent crash in the 4.18 release. Users have not provided any descriptions of their actions when the crash occurred. Source Context 849 uint32 UMaterialExpression::GetOutputT ...
Assertion failed on reimporting FBX scene
UE - Editor - Content Pipeline - Import and Export - Aug 7, 2024Following code works as a work around : void SFbxSceneStaticMeshReimportListView::OnChangedOverrideOptions(TSharedPtr<FString> ItemSelected, ESelectInfo::Type SelectInfo) { #if 0 check(ItemSele ...
Children of editor-only actors do not maintain correct transforms when placed inside level instances for PIE and cooked builds
UE - World Creation - Worldbuilding Tools - Level Instances - Oct 20, 2025We have found an issue where children of editor-only actors get wrong transforms in PIE and cooked builds when placed inside level instances. This affects both engine version 5.5 and 5.6. The issue ...
BokehDOFRecombine Incurs Cost Even While DOF Is Not Enabled
UE - Graphics Features - May 17, 2017While separate translucency is enabled DOFRecombine will incur a cost even when not using DOF (Scale of 0 or blur size of 0). Maybe we can check to see if those values are == 0 (meaning DOF is effec ...
Duplicate slots being created in Anim Slot Manager
OLD - Anim - Dec 11, 2015Duplicate slots are being created automatically under the Default Group in the AnimSlotManager. This is causing some problems because it replaces the originally created slot with the duplicate in t ...