Unreal Engine Issues
Unreal Engine Issues
Crash when using Share Material Shader Code and Native Metal Libs with r.Shaders.Optimize=0
UE - Rendering Architecture - RHI - Mar 17, 2020Using r.Shaders.Optimize=0 with native metal libs results in a crash of the packaged build at runtime. Workarounds is to either not use native metal libs for text shaders or in MetalShaders.cpp co ...
Capture Source not changing in Planar Reflections
UE - Graphics Features - Sep 14, 2020Changing the Capture Source in Planar Reflections is not working as expected. Without being able to change the source, Post Process Materials are not rendering in the Reflection. Reported in versio ...
Niagara Simulation Stage + DynamicMaterialParameters crash
UE - Niagara - Feb 6, 2021deleting the code "&& SimulationStages[i]->bEnabled" in UNiagaraEmitter::GetScripts will bypass the problem [Image Removed] ...
Left Clicking a menu that contains an option with a submenu will cause the submenu to close while hovering its options
UE - Editor - UI Systems - Mar 25, 2022If a menu has an entry that is a submenu, and that submenu has entries in it that are also submenus, then the entire menu will close when left clicking the submenu button instead of hovering it. So ...
FAnimUpdateRateParameters::GetInterpolationAlpha appears to be returning an invalid value for TrailMode
UE - Anim - Aug 5, 2023It appears that FAnimUpdateRateParameters::GetInterpolationAlpha is not returning a sensible value when running in TrailMode. Currently the only variable in the calculation is EvaluationRate which ...
Missing display units initialization from project settings
UE - Editor - Workflow Systems - Jun 11, 2024From customer: Hi there, I stumbled upon a bug where the display units as set in the Project Settings under the Editor Appearance category for properties were not getting displayed properly and was ...
Material Emissive Color not working with SkyAtmosphereIlluminance Material Expression
UE - Graphics Features - Jan 9, 2025A licensee has reported that they are unable to use an emissive material utilizing the SkyAtmosphereLightIlluminance material expression together with Nanite and Lumen. The linked UDN has some more ...
Control Rig Creation Crash Triggered by “skel” Prefix in Skeletal Mesh Name
UE - Anim - Rigging - Control Rig - Nov 27, 2025When generating a Control Rig from a Skeletal Mesh that contains “skel” in its name—or uses it as a prefix (i.e. skel_test)—Unreal Engine crashes. The crash occurs both when using the native Creat ...
Blueprint Editor: BP functions display dropdown instead of checkboxes for uint8 enum parameters
UE - Gameplay - Blueprint Editor - Aug 8, 2017I traced through the callstack and it looks like the problem is as follows:in order for the BP function to compile, its enum parameter must be uint8, because that is the only type supported by BP fu ...
Game sounds only play during first PIE editor session for Linux project
UE - Platform - Linux - May 11, 2015Games sounds will play as appropriate during first PIE session but subsequent PIE sessions have no sound until editor is closed / reopened. ...