Unreal Engine Issues
Unreal Engine Issues
Light Leak Issue in Modular Buildings (Lumen HZBTraversal)
UE - Graphics Features - Lumen - Oct 14, 2025Starting in Unreal Engine 5.6, disabling "r.Lumen.ScreenProbeGather.ScreenTraces.HZBTraversal" can lead to light leaking between adjacent or overlapping meshes. Also tested on Release-5.6, CL: 4523 ...
Unable to package with nativized functions that have a delegate-type input variable
UE - Gameplay - Blueprint - Oct 2, 2018Attempting to package a project that has nativization enabled for a function that takes a delegate-type variable as an input results in failure. Regression?: No This occurred in 4.19 ...
Building lighting fails on Linux with custom heightmaps in Russian localization
UE - Platform - Linux - May 28, 2015Building lighting fails when the engine localization is set to Russian (RU). Have not reproduced internally. This issue seems to be related to [Link Removed] since it occurs in the Russian localiz ...
Construction script in parent blueprint cannot call function in child blueprint
UE - Gameplay - Blueprint - Apr 1, 2016Construction script in parent blueprint cannot call function in child blueprint when the editor first loads. Once the parent BP is compiled it acts as expected. Regression? (Yes), issue (does not ...
Unused Foliage Type Causing Unbuilt Lighting
UE - World Creation - Worldbuilding Tools - Foliage - Feb 1, 2019Foliage components will be unbuilt even after deleting all of the placed foliage in a level. Found in 4.20 CL# 4369336, 4.21 CL# 4753647, 4.22 CL# 4827620 ...
Interface function has the incorrect pin type if referencing self
UE - Gameplay - Blueprint - Sep 1, 2015Interface function has the incorrect pin type if referencing self User Description: I have an interface that requires an array of its own interfaces as output. I have that array of interface as a ...
Cannot build Blueprint Function Library plugin for Mac and iOS
UE - Platform - Mobile - Apr 5, 2018Trying to Build a Blueprint Function Library plugin for Mac and IOS fails for IOS. The error message indicates that it is looking for the UE4Game file, but it appears to be looking in the wrong fold ...
AShooterGame_FreeForAll::DetermineMatchWinner is set up in a way that it will never provide any functionality
Docs - Samples - Sep 27, 2018The AShooterGame_FreeForAll::DetermineMatchWinner function is set up to compare each player's PlayerScore with the BestScore variable to see which players are considered to be the "BestPlayer" which ...
Default Values of Parameters from Material Function not saving in Material Instances
UE - Rendering Architecture - Materials - Feb 16, 2015A Parameter set in a Material Function cannot be reset to a default value in a Material Instance. Reproduced in 4.7p7 CL-2440994 and Main Promotable-CL-2444381 ...
Metallic Setting is not passed through Material Function in Feature Level ES2
UE - Graphics Features - Mar 26, 2015When a metallic input is passed into a material via a material function and previewed in ES2, the metallic is always returns 0 in the material. Also reproduced in Main Promotable-CL-2490775 [Image ...