Unreal Engine Issues
Unreal Engine Issues
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 ...
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 - Workflow Systems - 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 ...
Material Instance values lost when using Material Parameters inside of multiple Material Functions
UE - Rendering Architecture - Materials - Mar 30, 2018Material Instance parameters (that derive from parents using material functions) can have their data shifted or not saved. ...
AI Controller Possess Function Called When Opening a Character Blueprint with AutoPossessAI Set to Spawned
UE - AI - Apr 11, 2017AI Controllers' Possess function is being called when opening a blueprint that has the Auto Possess AI option set to Spawned. ...
Recent change to Material Expression code missing a case for "exp2" function in switch (cpp)
UE - Editor - Content Pipeline - Datasmith - Mar 4, 2024The function "FMaterialDerivativeAutogen::GetFunc1ReturnType(...)" does not have a case for "EFunc1::Exp2". Also found in Release-5.4, CL: 331987674 ...
Thin Translucent materials opaque with FS lighting mode and Output velocities active
UE - Rendering Architecture - Materials - Nov 15, 2021Im not 100% sure this is a combination of settings that "should" work anyway, but need someone to have a look.Thin TranslucencyOutput velocities during base passForward Shading lighting modeProject ...
Rect light LTC textures fail to load when cooking with bSharedLinearTextureEncoding enabled
UE - Texture - Apr 2, 2025When running a build with bSharedLinearTextureEncoding enabled, View.GGXLTCMatTexture and View.GGXLTCAmpTexture are pointing at the black texture fallback, which affects correctness of rect lighting ...
Forward Rendering Stationary Light Artifact
UE - Graphics Features - May 11, 2018The user who reported the issue has provided a video that also shows the issue: [Link Removed] ...