Unreal Engine Issues

Param usage bug when using switch params

From the ticket: In a material instance using the attached master material if A is TRUE and B is FALSE I expect to be able to configure param C in the UI. However param C is shown only when Useswi ...

USD Alembic - Groom cache shape changed from MAYA after imported into UE.

Starter Content's "P_Explosion" does not successfully convert to a Niagara System - incorrect loop, spawn, sprite size, and collision behaviors

Starter Content's "P_Explosion" does not successfully convert to a Niagara System - incorrect loop, spawn, sprite size, and collision behaviors Changes needed for / issues found with each emitter:A ...

Cook failure when World Partition maps have level instances using level blueprints

The following cook error results from attempting to package a WP map that has level instances using level BPs: LogCook: Error: PackageSplitter found the Generator package still in memory after it ...

Refraction can't be set using SetMaterialAttributes node in a material function.

From the UDN: Currently, I'm using UE5, but I've seen this issue occur in UE4 and I don't see any other posts on UDN about this. Refraction can only be set in material functions if using the MakeMa ...

MaterialExpressionLandscapeLayerBlend with material attributes as inputs, the output material attributes have wrong sizes

From the UDN ticket: When using MaterialExpressionLandscapeLayerBlend with material attributes as inputs, the output material attributes have wrong sizes: ie output Normal attribute cannot be conve ...

Selecting a spline point of a Spline Component using the Select Spline Points buttons in the Spline's details panel causes issue when trying to manipulate the same or different spline point in the view port.

The situation of using the new feature causes an old feature to stop working correctly making it a regression. Selecting a spline point of a Spline Component using the 'Select Spline Points' button ...

Noticeable input delay at lower FPS while Playing in Editor

When playing in editor is running at a lower fps (<20) there is very noticeable input delay that wasn't present in 4.27.2. Works correctly while playing in Stand Alone or Packaged. Tracked this iss ...

FEditorFileUtils::SaveCurrentLevel returns true even when it fails

In FEditorFileUtils::SaveCurrentLevel, we set the default return code as true (success) before checking validity of the current level or seeing if PromptToCheckoutLevels is successful. If we're unab ...

Misleading error message while attempting to drag in a BlueprintCallable Function into an Event Graph

An error message informs the user that a function does not have the BlueprintCallable keyword if the same function is using a  native to blueprint communication keyword. The function/keywords are b ...