Unreal Engine Issues
Unreal Engine Issues
The HISM will have double drawcalls when player opens r.Mobile.AllowDitheredLODTransition
UE - World Creation - Worldbuilding Tools - Foliage - Nov 2, 2020Please check the Function GetDynamicMeshElements in HierarchicalInstancedStaticMesh.cpp. The Function Traverse in GetDynamicMeshElements will always return two Lod levels, even the transition is f ...
Puzzle template blocks turn gray when hovered over in Code version vs no reaction in BP version
Docs - Samples - Feb 3, 2017Functionality is different between code and bp versions of the puzzle template ...
FInstancedStruct does not serialise to JSON when used in a DataTable
UE - AI - Aug 4, 2025The JSON export functionality for DataTable relies on a FieldIterator to gather properties. This iterator is unable to gather the properties from the InstancedStruct. CSV export functionality works ...
Crash in IndirectLightingCache on level load
UE - Graphics Features - Aug 11, 2016May be a duplicate of this bug, which was closed due to no repro:https://jira.ol.epicgames.net/browse/UE-10978 ...
FAES::DecryptData does not decrypt the supplied input.
UE - Foundation - Core - Jun 22, 2016Something that has been encrypted with the FAES::EncryptData() function does not return to the original input when decrypted with FAES::DecryptData(). ...
Blueprint Implementable Events and Event dispatchers with the same name break the event dispatcher.
UE - Gameplay - Blueprint - Sep 22, 2015Creating an event dispatcher and BlueprintImplementableEvent function with the same names causes a signature conflict inside the blueprint. The event dispatcher is then broken as it cannot be delet ...
Lightmass export can fail with duplicated static mesh assets
UE - Graphics Features - Aug 30, 2017See https://answers.unrealengine.com/questions/853450/417-lighting-build-fails.html ...
Keep Simulation Changes Applies to Incorrect Actor with Sublevels
UE - Editor - Jun 21, 2023When setting properties and saving simulation changes, EditorUtilities::GetEditorWorldCounterpartActor and EditorUtilities:GetSimWorldCounterpartActor functions seem to get the wrong actor. Actors i ...
GeometryScript: BlueprintCallable GetMaxMaterialID return pin is incorrectly named "Enabled" instead of "MaxID"
UE - Graphics Tools - Modeling Tools - GeometryScripting - May 2, 2025The return pin for the "Get Max Material ID" function is incorrectly named "Enabled" when the function returns the MaxID. See \Engine\Plugins\Runtime\GeometryScripting\Source\GeometryScriptingCore\ ...
Code review for potential fix for crash where Velocity contains NaN
UE - Gameplay - Aug 20, 2015User crashed in the function "void UCharacterMovementComponent::PerformMovement(float DeltaSeconds)" due to a Velocity containing NaN. AnswerHub post details function calls that lead to where the N ...