Unreal Engine Issues

Datasmith - Lights imported with incorrect transforms

Reported in SF [Link Removed] In Twinmotion 2025.1.1, lights imported through Datasmith appear with incorrect transforms. Lights will appear rotated 90 degrees about the Y axis with an offset. Test ...

The bake_transform_with_settings method works in 5.6 but not 5.7

Trying to automate the process of baking transforms via python and the identical code above works in 5.6 but not in 5.7. There are no error messages in the output log. When running in 5.7, it does ...

DoDeferredRender will not UpdateBound correctly when NavigationCachedBoundsUpdated

With InstancedStaticMeshComponent, after calling AddInstance, an instance that’s far away gets culled because of additional logic that was added in 5.7 to This works correctly in 5.6 and the instanc ...

LevelSequenceActor transform offset for Sequencer lost on value changed

Toggling Lock, Pin, Ignore on subsequences or adding new transform key on a character inside a subsequence the Actors lose the LevelSequenceActor transform offset they have at preview and go back to ...

Reimporting of skeletal mesh results in a scrambled skeletal mesh

When we reimport our skeletal meshes with updated FBXs, the resulting skeletal mesh is scrambled up. See Scrambled.jpg attached. This does not affect every single reimport but happens randomly. W ...

[AI] StateTreePropertyRef does not have option for Promote to Parameter

I got a report from one of my designers that since we took 5.6, they have been unable to see the "Promote to Parameter" options when attempting to bind an output from one of our common tasks. I took ...

Landscape weight-blended layers don't paint exclusively anymore

HLOD generation can run out of space in the FName table

A licensee reported that generating the HLOD for his large WP based level is running out of space in the FName string table.  He tracked the source of the problem to CL 47064601. Upon inspection ...

RuntimeCellTransformers can result in increasing the instance count when a BP instance is not destroyed.

The problem is related to the SimpleConstructionScript that executes on the BP instances after the transformer.  The problem also happens at cook time as the SCS is executed when the package is sav ...

Changing per layer parameters in a layered material that writes to RVT can cause temporary visual corruption

When using a layered material that writes to a runtime virtual texture. Sometimes when modifying a layer parameter in the material instance editor. The cached material data in the runtime virtual ...