Unreal Engine Issues
Unreal Engine Issues
Getting Vector Parameter Values from a Dynamic Material Instance with 1 or more vector parameters returns an empty array
UE - Rendering Architecture - Materials - Jan 3, 2023This is not a regression. Tested in //UE5/Release-5.0 CL20979098 The array for Vector Parameters isn't getting populated when called from a Dynamic Material Instance. ...
Foliage is Offset When Streaming Existing Levels From World Composition
UE - World Creation - Worldbuilding Tools - Foliage - Jul 3, 2018Streaming an existing level that used World Composition places the landscapes in the correct spot, but any foliage tied to that landscape is placed on the landscape tile at 0,0 instead of its corres ...
StartPlayInEditorGameInstance doesn't consider bStartInSpectatorMode for client instances
UE - Networking - Nov 15, 2022In UGameInstance::StartPlayInEditorGameInstance, the server instance will go through the normal process of creating the URL using BuildPlayWorldURL, which checks the FGameInstancePIEParameters' bSta ...
Second controller input doesn't work setting client mode on PIE.
UE - Gameplay - Input - Feb 3, 2021When two controllers connected, player2 input is disabled in client mode in PIE. It worked correctly in 4.25, but it has been wrong since 4.26. Digging into FSlateApplication::ProcessKeyDownEve ...
UMG: RetainerBox with zero-size child returns incorrect LayerId on OnPaint()
UE - Editor - UI Systems - Nov 4, 2025When a RetainerBox contains a child that for some reason has a desired size of zero, its OnPaint() method can incorrectly return LayerId 0. Afterwards, widgets further down the hierarchy can base th ...
Disabled Skeletal Mesh Sections cause Shadow Ray Tracing Flicker
UE - Graphics Features - Ray Tracing - Dec 12, 2025If a skeletal mesh has a section disabled the ray traced shadow will flicker when the camera or itself moves. Previously in 5.6.0 no raytraced shadow would appear if a section was disabled. This wa ...
Unable to play replays with custom GameNetworkProtocolVersion set at runtime
UE - Networking - Sep 20, 2023It seems that when comparing the custom versions for a replay (in the "operator<<" defined in ReplayTypes.cpp), the value retrieved from the FCurrentCustomVersions is not the value set at runtime, b ...
Logging out and then logging in as a new user results in slate creating multiple Slate User IDs
UE - Gameplay - Input - Jul 28, 2023I believe this is happening because when you change your logged in user, the Slate Application will automatically create a new second slate user with an ID of 2. This is bad because the Slate App is ...
Iris - Server fails to send client initialization RPCs after seamless travel if the client finishes travelling first
UE - Networking - Iris - Nov 18, 2025During seamless travel, when a client loads into the destination level it will call APlayerController::ServerNotifyLoadedWorld, including when it finishes the travel before the server. When the serv ...
Does FSlateElementBatcher::AddCachedElements need to check if r.HDR.UI.CompositeMode is enabled?
UE - Editor - UI Systems - Aug 28, 2024When a specific configuration of HDR cvars are set, PIE in a New Editor Window will not render the game world. Settings (For DefaultEngine.ini): ```[SystemSettings] r.AllowHDR=1 r.HDR.Display.Color ...