Unreal Engine Issues
Unreal Engine Issues
Calling RegisterComponent in the PreInitializeComponents of an Actor will cause child components of its components to not be initialized
UE - Gameplay - Dec 15, 2017Calling RegisterComponent in the PreInitializeComponents of an Actor will cause child components of its components to be ignored because the Actor is still being initialized. My understanding is tha ...
Breakpoint triggered in Visual Studio after running "{,,UE4Editor-Core}::PrintScriptCallstack()" command
UE - Gameplay - Blueprint - Jan 10, 2018Running the command {,,UE4Editor-Core}::PrintScriptCallstack() in the Immediate Window in Visual Studio while debugging is paused in Visual Studio will result in a breakpoint being hit when the ...
Merging negative-scaled actors breaks materials
UE - World Creation - Worldbuilding Tools - HLOD - Mar 27, 2018Materials are broken when merging a mesh with another that has negative scale Licencee states that bisMirrored in FMeshMergeHelpers::TransformRawMeshVertexData seems to be involved. Does not occur ...
Distance Field Shadows Not Working On Large Objects
UE - Graphics Features - May 10, 2018UDN Licensee reported this on 4.16, and I can repro in 4.17- 4.19. Per Licensee: I'm trying to use distance field shadows on very large objects, but it looks like it does not work. Can you sugge ...
Adding a camera cut track through sequencer scripting does not set the movie scene's camera cut track
UE - Anim - Sequencer - Mar 13, 2020When adding a camera cut track through sequencer scripting there is no way to set the camera cut track on the movie scene, which is how the add track menu determines if a new one can be added. This ...
BlackboardComponent observer can be called for the wrong key
UE - AI - BehaviorTree - Feb 7, 2023We need to, at least, prevent this by clearing observers when running a new BT using a different blackboard. Must also think that this might affect licensees relying on the current behavior (might h ...
TranslucentVolumeAmbient is darkened in InjectTranslucencyLightingVolume pass when using VSMs with r.Shadow.Virtual.ForceOnlyVirtualShadowMaps is Off
UE - Graphics Features - Shadows - Nov 18, 2024CSM targets are still created and affect the InjectTranslucencyLightingVolume pass when moving in a project that only uses VSM causing over brightening of fog planes and other translucent meshes. r ...
Compiling any material in UE 5.5.1 without ShaderCompiler JobCache results in a crash
UE - Rendering - Architecture - Shaders - Jan 15, 2025Compiling any material with r.ShaderCompiler.JobCache=0 causes ShaderCompileWorker to crash. Reproduction steps cause a crash during Editor startup, but this bug may affect other scenarios where mat ...
Popping Ribbon UVs
UE - Niagara - Mar 10, 2025Please see the Additional Link for related UDN information. The UV popping described can be subtle, depending on settings; it's affected by spawn rate and GPU vs CPU. The popping shown in the gif t ...
Niagara Fails to Compile Shader For iOS and Android
UE - Niagara - Aug 2, 2018Niagara fails to compile shader for iOS and Android. Unable to test in 4.19 due to assets provided being created in 4.20. Found in 4.20 CL# 4233996 and 4.21 CL# 4247867 ...