Unreal Engine Issues
Unreal Engine Issues
References to Data Assets that inherit from Blueprints may be broken during reinstancing
UE - Gameplay - Blueprint - Nov 30, 2020It is possible to create new Data Asset instances in the editor that inherit from a blueprint-defined subclass of UDataAsset. This flow is not very well supported, and generally it is safer to just ...
Users can't change flags on asset entries in PSD when the asset was added via a Branch In notify
UE - Anim - Gameplay - Mar 19, 2025Assets added to a PSD via a Branch In notify can't have their flags changed within the database. When the flags (like mirror, disable, etc) are changed, they revert back to the original value when ...
Dynamic Light placed inside of a Dynamic Static Mesh doesn't pass through the geometry
UE - Graphics Features - Jun 2, 2017Dynamic Light placed inside of a Dynamic Static Mesh doesn't pass through the geometry. The static mesh is not double-sided. User Description: It appears that in Unreal 4.16 one loses the ability ...
Building Nanite on a Landscape with Visibility Mask multiple times gives an Assert
UE - Graphics Tools - Terrain - Landscape - Aug 28, 2023Repro Rate 15/25 Regression set to Yes as this was not found on //UE5/Release-5.2 CL 26001984 Binary Building Nanite with a Landscape that has a material including Landscape Visibility Mask still ...
Crash when a Deferred Decal (Translucent) base material has a Nanite Override (Masked Surface) Material and the mesh has Nanite + Ray Tracing enabled.
UE - Graphics Features - Ray Tracing - Aug 14, 2025A crash occurs when Nanite override material instance is used in a project with Ray tracing enabled where: 1 The Material assigned to the static mesh uses Deferred Decal / Translucent and the Nani ...
GenerateProxyMesh causes incorrect transform in ISM using Scale
UE - World Creation - Worldbuilding Tools - HLOD - Aug 20, 2019MeshVertex has been converted by component transform before being converted by instance transform. It is ( Vertex * ComponentTransform ) * InstanceTransform. I thought it has to be converted by (Ve ...
Copy, Paste and Hover a Material Layer Blend Node causes Crash
Tools - Jun 25, 2015In the Material Editor, if all Live Previews are turned off, copying and pasting a Material Layer Blend Node will crash when the tool tip is being processed. Also Reproduced in Main Promotable-CL-2 ...
FCDODiffControl doesn't properly account for lists of differing size.
UE - Gameplay - Blueprint - Sep 21, 2016FCDODiffControl doesn't properly account for lists of differing size. The issues are marked in the following code:int IterOld = 0; int IterNew = 0; while (IterOld != OldProperties.Num() || IterNew ...
TickComponent and PostPhysicsTick in SkeletalMeshComponent can cause simultaneous read/write access
UE - Anim - Runtime - Jan 18, 2023When a SkeletalMeshComponent is restarted by calling in order of SetSimulatePhysics and SetComponentTickEnabled, the TickComponent and EndPhysicsTick are executed simultaneously. As a result, the ...
Lumen screen traces from hair cast noising moving shadows on faces
UE - Graphics Features - Lumen - May 17, 2024There is moving blotchy noise on the head and face from hair when Lumen HZB tracing hits hair. CL 33258050 fixes the noise in the hair, but tracing still hits hair when it starts from surfaces like ...