Unreal Engine Issues
Unreal Engine Issues
Lumen Translucency lighting vs opaque mismatch is larger than expected
UE - Graphics Features - Lumen - Sep 5, 2025The licensee's VFX team has been struggling with getting their Niagara systems with translucent materials to fit into the environments they are being used in. In a project with default settings, the ...
Modifying the view size can cause TSR history to allocate large amount of memory
UE - Graphics Features - Sep 4, 2025When animating the split fraction of a splitscreen experience, TSR causes an significant increase in UAV memory. In PIX, this appears to be caused by TSR allocating the history multiple times when ...
Sequencer is not taking into account the TransformOriginOffset of the level sequence actor.
UE - Anim - Sequencer - Sep 3, 2025When a level sequence actor has camera's marked for preroll in it and information is gathered for a camera cuts location to send to the streaming manager, it does not take into account the Transform ...
Find in Blueprints: Default values of TMap keys are not returned
UE - Framework - Blueprint Editor - Sep 3, 2025Context Find-in-Blueprints can be used to search the current, or all, blueprints. If you enter a simple string, it would return nodes, pins, pin default values and default values for BP Variables ( ...
PoseSearch Query is flipped 180 degrees 1 frame after a capsule/actor rotation happens.
UE - Anim - Gameplay - Sep 3, 2025Using MotionMatching with a PoseSearchSchema with a Trajectory grouping. The query gets rotated to match the capsule/mesh component instead of the offset root/actual location of those bones/trajecto ...
Invalid GUIDs on new material instance parameters cause overrides to break on base param rename
UE - Rendering Architecture - Materials - Sep 3, 2025When a parameter value is assigned on a newly created material instance (constant or dynamic) using Set***ParameterValueInternal, the parameter’s ExpressionGUID is left invalid (0,0,0,0). Parameter ...
RigVMRegistry : The registry is not locked for writing yet : ensure statement error during cook
UE - Anim - Rigging - Control Rig - Sep 2, 2025I am seeing an cook failure at the very beginning. It goes away with a retry step via Horde. Please find attached call stack. I am able to consistently reproduce it by wiping all the DDC cache and ...
Negatively scaled box collisions render back faces in Player Collision debug view
UE - Simulation - Visual - Sep 1, 2025The player collision debug visualization for negatively scaled boxes is rendering the back faces, not the front faces. The debug primitives are rendered via the dynamic mesh builder. FDynamicMeshBui ...
When ControlRig.EnableAnimNodePerformanceOptimizations is enabled, the default pose briefly appears after the Control Rig is reinitialized
UE - Anim - Rigging - Control Rig - Sep 1, 2025Since UE5.6, ControlRig.EnableAnimNodePerformanceOptimizations is enabled by default, and this appears to be causing the issue. Specifically, when the control rig’s construction event is processed, ...
Crash when running "MAP REBUILD ALLVISIBLE" with hidden sublevels and then changing maps
UE - World Creation - Worldbuilding Tools - Sep 1, 2025Running the MAP REBUILD ALLVISIBLE editor command when the current map contains hidden sublevels causes a crash upon changing maps. The issue seems to be related to hidden sublevels being cleared in ...