Unreal Engine Issues
Unreal Engine Issues
Shader compilation errors when packaging for iOS after disabling force full precision
UE - Platform - Mobile - May 29, 2024User report: I want to run iOS shaders with half precision floats as I do on Android. If I disable Force 32 bits Floating Point Precision, there are unfortunately a bunch of shader compilation error ...
Crash in FLandscapeRenderSystem on Mobile
UE - Graphics Tools - Terrain - Landscape - Aug 4, 2021Similar issues have already been reported here for iOS [https://udn.unrealengine.com/s/question/0D52L00004vJelTSAS/crash-ios-in-flandscaperendersystemcomputesectionperviewparameters] and here [https ...
Landscape is missing its material when running a packaged project on Linux arm 64
UE - Graphics Tools - Terrain - Landscape - Apr 22, 2024From licensee: The project contains a small flat terrain with a basic material attached to it - just a single texture sampler connected to the base color output. Also in the project is a skeletal m ...
Painted Landscapes have blacked out sections when deployed to a mobile device
UE - LD & Modeling - Terrain - Landscape - Mar 24, 2015If a user uses a multi layered material to pain a landscape and then deploys this project to an iPhone 6 plus our an Android Samsung Galaxy Note3 (SM-N9005) parts of the landscape will appear to be ...
NVIDIA 5080 GPU Crash when launching City Sample with DX12
UE - Graphics Features - Lumen - Apr 16, 2025UPDATE This issue no longer reproduces on driver versions 580.88 and higher. City Sample game crashes immediately upon opening with a NVIDIA 5080 with the latest drivers as well as some previous dr ...
OcclusionFeedback may not be performant for primitives with large screensize
UE - Platform - Mobile - Dec 13, 2025A licensee reported that the performance could be worse in some scenarios (probably a small scene with large objects) with OcclusionFeedback enabled ( 20fps up if disabled), tested on a Qualcomm 870 ...
Unable to compile Runtime plugins
UE - Foundation - Cpp Tools - Plugin System - Jun 27, 2018Attempting to package a runtime plugin in 4.20 results in the following error: ERROR: System.IO.DirectoryNotFoundException: Could not find a part of the path 'D:\Unreal Projects\4.20\PluginTest\Test ...
SessionFrontend Causes Lost Audio on iOS After Switching Apps
UE - Audio - Oct 20, 2020When using SessionFrontend on some devices, when leaving the app (going to the home screen or another app) or sometimes locking the device there is no more audio after returning to the game. "It lo ...
Movable point light disappeared by MinScreenRadiusForLights and appeared back looks deemed.
UE - Platform - Mobile - Jun 25, 2021The movable point light is abnormally lit when it disappeared by the setting of r.MinScreenRadiusForLights rather than "Max draw distance" and appears back. After you disable and enable the "Affect ...
Umask ignored on Linux
UE - Platform - Linux - Aug 28, 2019UE4 is hardcoded to use 755 for files and directories. See mkdir() in Engine/Source/Runtime/Core/Private/Unix/UnixPlatformFile.cpp This is also repeated for Android, HTML5, and Lumin but i cannot c ...