Unreal Engine Issues
Unreal Engine Issues
Dynamic point lights generate shader compile errors on HTML5
UE - Platform - Mobile - Aug 20, 2015The new ES2 movable point lights look promising. Unfortunately, there seems to be an issue with them in HTML5 builds. They work great in the ES2 preview mode in the editor, but when running in an ac ...
Subsurface Profile Materials That Are Illuminated By Particle Lights Render White
UE - Graphics Features - Feb 9, 2017Due to the changes made to subsurface profile (implementation of full resolution skin shading) it now renders white or with heavily faded base colors under certain conditions. In this case it is wh ...
Crash when attempting to change the parent of a material instance constant through editor scripting
UE - Rendering - Architecture - Materials - Apr 9, 2025The built-in class "UMaterialEditingLibrary" provides various editor scripting functions related to creating and editing materials and material instances. One of these functions, UMaterialEditingLib ...
Unable to use TWeakObjectPtrs for the optional Old value for a repnotify function
UE - Foundation - Cpp Tools - UnrealHeaderTool - Oct 8, 2018A user has reported that Unreal Header Tool fails to parse a rep notify function properly when the optional parameter for the Old value is populated with a TWeakObjectPointer. Example of errors:Sev ...
Set view range scripting functions will not update timeline UI
UE - Anim - Sequencer - Feb 4, 2021Using the scripting functions to set the view range of a sequence will not update unless the sequence is re-opened. Usual updates for scripting issues like locking and unlocking the sequence don't w ...
Creating a function with parameter type TEnumAsByte<MyEnum> will crash while compiling
UE - Editor - Jan 11, 2022This is a regression.This does not affect UE5. Creating a function with parameter type TEnumAsByte<MyEnum> will crash while compiling. In 4.26 and UE5 the code compiles without issue, and the user ...
UHT needs to enforce that BlueprintNativeEvents have "virtual" on user-defined _Implementation functions
UE - Foundation - Core - Mar 3, 2015Forgetting to add the "virtual" in engine code implementations of these _Implementation functions makes them not overridable by users. UHT should catch this and emit a warning/error. For instance t ...
Light baking of a ton of static meshes causes Swarm to crash.
UE - Foundation - Cpp Tools - Mar 25, 2019Light baking of a ton of static meshes causes Swarm to crash due to "Index was our of range". I confirmed that it can be reproduced with the sample project they sent us/ The error log I got is... ...
Curve Table Editor's "Add Key" functionality does not work and appears to not be implemented..
UE - Editor - Aug 5, 2024Creating a new Curve Table asset, and then trying to use the right-click menu "Add Key" option does not do anything. FRealCurveModel still has the function, but it is left intentionally empty despit ...
Pressing enter to confirm a function description instead enters a new line
UE - Gameplay - Blueprint - Sep 9, 2016Using Enter to accept the description of a blueprint function causes the cursor to return to a new line instead of accepting the current input. Regression: Yes - Pressing enter in 4.12 would accept ...