Unreal Engine Issues
Unreal Engine Issues
Collision Animators set to Once Loop mode will not play in Cloud Presentations
TM - Tools - Apr 21, 2026Reported in SF [Link Removed] Animators will not trigger in Cloud Presentation when in Collision mode and the Loop mode is set to Once. The animation playback will occur properly in the editor vie ...
"Move Selection to Current Level" can duplicate actors when cancelling
UE - World Creation - Worldbuilding Tools - Apr 17, 2026When moving an Actor that is referenced in the source level, UEditorEngine::CopySelectedActorsToClipboard will try to select the Actor for delete which will pull the \"Delete Referenced Actor\" dial ...
ServerUpdateLevelVisibility called multiple times from UWorld::AddToWorld/RemoveFromWorld due to child connections
UE - World Creation - Worldbuilding Tools - World Partition - Apr 16, 2026A recent change to ULevelStreaming::ServerUpdateLevelVisibility ensures that this only calls APlayerController::ServerUpdateLevelVisibility once for any non-child connections ( ...
Deadlock during cooking or editor in URigHierarchyController::AddElement on task thread while GarbageCollection occurs on gamethread.
UE - Runtime - Animation - Apr 15, 2026In URigHiearchyController::AddElement (and other functions), arbitrary delegate code is called while holding Hierarchy->ElementsLock, through the Notify function. URigHierarchy::AddReferencedObject ...
Megalights support for anisotropic materials
UE - Rendering - Graphics Features - Lumen - Apr 14, 2026A licensee noticed that SUPPORTS_ANISOTROPIC_MATERIALS is not passed to FShadeLightSamplesCS::ModifyCompilationEnvironment for MegaLights ShadeLightSampleCS. Adding it fixes the issue. ...
CharacterMovementComponent boosted upward when falling into acute-angle sloped corner
UE - Gameplay - Player Movement - Apr 14, 2026In UCharacterMovementComponent::TwoWallAdjust, characters can gain unintended upward velocity (slope boosting) when hitting corners with an acute angle (<=90 degrees) while in the Falling movement m ...
Niagara System is causing Application SpaceWarp to get disabled
UE - Platform - XR - Apr 13, 2026Registration Export: Image Export Overwriting
RS - Alignment - Apr 13, 2026When exporting a registration (e.g., for COLMAP), RealityScan exports all images into a single image folder. If the source dataset contains images with identical filenames located in different subfo ...
Raytraced Hair Lighting using Light Functions atlas and positions the Light function material doesn't render correctly
UE - Rendering - Graphics Features - Apr 9, 2026Light functions don’t render on grooms when using ray traced shadows and positions in the light function material. The setup:A light (point/rect/spot) pointing to a groom hair system. The light's ...