Unreal Engine Issues
Unreal Engine Issues
Any Alpha value set in a FLinearColor used to draw a line on a Canvas HUD is ignored when the line is drawn
UE - Graphics Features - Apr 21, 2015If an Alpha value is set in a FLinearColor that is used to draw a line on a Canvas HUD, the Alpha value is ignored when the line is drawn. A comment in BatchedElements.cpp indicates that some legac ...
Hot reload fails in 4.16 projects that were upgraded from 4.15.
UE - Foundation - Cpp Tools - Hot Reload - May 16, 2017This issue appears to be a continuation of [Link Removed]. Hot reloads work successfully in projects that were created in 4.15 or 4.16 and are still using the same Engine version that they were crea ...
Child component reports Parent during On Hit events instead of itself
UE - Simulation - Physics - Solver - Sep 12, 2022This is a regression tested in //UE4/Release-4.27 cl18319896 Child collision component reports its' Parent during On Hit events instead of itself. ...
Installed Editor doesn't package the right target if Marketplace plugin are installed before first launch
UE - Platform - Jun 18, 2024Something is wrong with the TargetInfo.json file generated when they are some Marketplace plugin installed. The client reported this workaround: Backup the plugins found in Engine\Plugins\Marketp ...
Modules with Emitter Life functioning incorrectly
UE - Graphics Features - Jan 7, 2016Setting the Emitter Time module with an emitter that is not set to loop will result in an incorrect render of the particles past the emitter duration. Emitter Duration set to 3 seconds:[Image Remov ...
TMaps with instanced objects: modifying instanced object data in child affects parent
UE - Gameplay - Blueprint - Jul 25, 2023Given a TMap where the value type is an instanced object: when a child blueprint is saved with modifications to the TMap, and then additional TMap are added to the parent blueprint and the child blu ...
StructUtils plugin's `FInstancedStruct` in a CPP-defined struct in a `TArray` on an actor component defined in CPP and implemented in BP. Populating the instanced struct in an actor BP's class defaults breaks serialization of the class defaults.
UE - AI - May 30, 2025Context Instanced structs are great for holding simple data with the main advantage they have is a low memory overhead unlike instanced objects. Problem The problem is in StructUtils plugin's `FIns ...
iOS - Windows - Code projects fail to launch and package
UE - Platform - Mobile - Aug 1, 2016Attempts to Launch On to or Package for iOS fail with: LogPlayLevel: Program.Main: ERROR: AutomationTool terminated with exception: AutomationTool.AutomationException: Unabled to build Project C:/Pr ...
Foliage rendering issues when using both Density Scaling and MaxWorldPositionOffsetDisplacement
UE - World Creation - Worldbuilding Tools - Foliage - Aug 29, 2024When a material with WPO effects and MaxWorldPositionOffsetDisplacement is applied to a foliage mesh, foliage applied to a map will no longer work as expected with density scaling, especially after ...
Blueprint compile fails after changing the default values of a struct that is part of another struct that makes up a Data Table that is used within the Blueprint.
UE - Gameplay - Blueprint - Dec 23, 2016Changing the default value of a struct that is included as an array in another struct can prevent any Blueprints that use a DataTable made from the second struct from compiling. It appears to be a p ...