Unreal Engine Issues

Flickering shadows/GI when DrawMaterialToRenderTarget is called per tick in PIE

When DrawMaterialToRenderTarget function is called on tick and actors are spawned in game, the lumen shadow/GI visually flickers. Debugging shows that the lumen screen probes are flickering as well. ...

Render Graph pass merging issue with async compute transitions

A UDN user reported an edge case in RDG that triggers an assert. ...

GeometryCollection with StripOnCook and without EnableNanite causes a crash in cooked game

The Strip on Cook option seems to strip even necessary data. ...

Volume material doesn't support EyeAdaptation node

Command buffer failure rates increased on iOS 15 devices compared to earlier iOS versions

There is a licensee report that command buffer failure rates on iOS 15 devices have increased compared to earlier iOS versions, and the issue may be related to foregrounding or backgrounding. ...

Landscape components not returning physical material with LineTrace in Editor mode

The OutHit from a LineTraceByChannel against a landscape in Editor is not returning the Physical Material of that landscape. While PIE there is no issue. While using BoxTrace (even in Editor) there ...

BlendSpace DeltaTimeRecord.Delta can incorrectly be set to zero

It's possible for blendspaces to end up with an invalid delta time record because of how UBlendSpace::TickAssetPlayer modifies the time record.  This only seems to happen with specific settings:Axis ...

Access Violation - UMovieSceneFolder::PostLoad - Accessing freed memory

A licensee has hit an access violation issue due to a movie scene containing a reference to an invalid child object binding. It triggers in the following method: UMovieSceneFolder::PostLoad // Vali ...

Tracks that manipulate byte properties may have different (non-deterministic) results even for the same frame

This issue is relatively easy to reproduce, e.g., in the timing of switching between the two types of property operations within the same track. It seems to be easy to reproduce the above problem in ...

Create a "Input Device User Mapping Schema" of some kind for PC

When you are playing a game on PC (especially local multiplayer) many developers want to change how input devices are "mapped" to different players. For example, a single player game might want the ...