Unreal Engine Issues
Unreal Engine Issues
Local lights appear broken when baking lighting with GPU Lightmass
UE - Graphics Features - Jun 2, 2025Encountered an issue where local lights appear to be broken when baking lighting with GPU Lightmass. See screenshots attached. Tested regression in //UE5/Release-5.5 @ CL40574608 and the issue does ...
TSR and TAA history accumulation gets reset when taking viewport screenshots or when clicking outside the tree in the outliner
UE - Graphics Features - May 30, 2025TSR (and TAA) history accumulation gets reset when taking viewport screenshots or when clicking on an empty area in the outliner (when a tree item is selected). This can cause an undesirable issue w ...
GLTFExporter indexing issue
UE - Editor - Content Pipeline - glTF - May 29, 2025Hi, I also ran into an issue when exporting a skeletal mesh that has multiple sections that all share the same material slot. It looks like the index buffer that's constructed is incorrect. In GLTF ...
VSM SMRT SamplesPerRay CVars behave differently if groom assets are present leading to a potential full-scene shadow
UE - Graphics Features - May 28, 2025When a groom is present, setting any SamplesPerRay SMRT CVar to zero results in an unexpected complete shadow projected from the light. ProjectLight() in VirtualShadowMapProjection.usf has addition ...
Rendering of a Text Widget with Outline does not track LayerId correctly
UE - Editor - UI Systems - May 27, 2025Text widget with Outline uses 2 LayerId levels to draw the outline and the text glyphs. This can be seen in function FSlateElementBatcher::AddShapedTextElement(), where lambda BuildFontGeometry() is ...
USkeletalMesh::Serialize should preload dependent skeleton
UE - Anim - Runtime - May 23, 2025In the skeletal mesh serialize method, we rebuild the ref skeleton for the mesh via this call:GetRefSkeleton().RebuildRefSkeleton(GetSkeleton(), bRebuildNameMap); So there's a dependency on the ske ...
Iris - Subobjects marked COND_InitialOnly not replicated
UE - Networking - Iris - May 23, 2025When adding replicated subobjects to the registered subobjects list, you can set replication conditions to control how the subobject is considered for replication. Without Iris enabled, a COND_Initi ...
Creating FTickableObjectBase inherited class in async thread may cause pure virtual function call
UE - Framework - May 22, 2025Classes that inherit from FTickableObjectBase are added to the tickable queue by the QueueTickableObjectForAdd function during their construction (see FTickableGameObject::FTickableGameObject). At t ...
Reimporting an asset during PIE overwrites the bAllowCPUAccess value to true
UE - Editor - Content Pipeline - Import and Export - May 22, 2025When reimporting a static mesh asset before PIE execution, the value of bAllowCPUAccess is false. If reimporting a static mesh asset while PIE is running, the value of bAllowCPUAccess is true. In a ...
When importing static mesh using interchange and collision is generated, the asset does not have Collision Generated set to true
UE - Editor - Content Pipeline - Import and Export - May 19, 2025Context: The Interchange Framework is Unreal Engine's import and export framework. When importing a mesh without collision, collision can be auto-generated. Problem: The problem is when importing s ...