Unreal Engine Issues
Unreal Engine Issues
Paper2D performance regression due to TArray resizing
UE - Graphics Features - Aug 16, 2019We've noticed after upgrading our heavy Paper2D project to 4.22 that tilemap performance has been massively degraded compared to previous versions. After some digging we found out that it's due to a ...
Open Formats: Interchange Import Runtime - Interchange ImportAssetAsync runtime GLB import — materials, textures, tangents, and shaders non-functional in packaged builds (6 issues, UE 5.7.4)
UE - Editor - Open File Formats - Apr 30, 2026Description* We are using Interchange's `UInterchangeManager::ImportAssetAsync()` to import GLB files at runtime in a packaged (Shipping) application. The orchestration layer (`ImportInternal` in `In ...
FViewElementPDI::DrawLine calls for SDPG_World are not rendered in PIE or in Game
UE - Rendering - RHI - Jan 7, 2026When View.Family->EngineShowFlags.CompositeEditorPrimitives is false in the function RenderEditorPrimitivesForDPG. This code picks which version of the batched lines to renderconst FBatchedElements ...
SampleCurve And SampleColorCurve Nodes Missing In Niagara Module Scripts
UE - Niagara - Mar 19, 2020In a Niagara Module Script the "Sample Curve" and "Sample Color Curve" nodes cannot be found. They were findable in 4.24 prior to 4.24.3. This seems related to this ticket. Found in 4.24.3 CL#11590 ...
Crash on map change with non-null values for GPropertyColorationClass and request customizable property coloration color
UE - Editor - Verse Class Editor - Aug 7, 2023This was found by a customer through a UDN, and they offered the fix for it, as well. The basic steps to reproduce the crash are as follows:call GEditor->SetPropertyColorationTarget(...) somewhere i ...
[CrashReport] UE4Editor-CoreUObject.dylib!UPackage::Save() during COTF
UE - Foundation - Core - Cooker - Nov 21, 2017This is a common Mac crash that has occurred since at least 4.17.1 User DescriptionsJust trying to launch my project on any output I can. No luck.launching AR project on IOS device. Ugg. Last adjus ...
Linked Anim Graph With Mesh With Post Process BP Has Faster Animation Playrate
OLD - Anim - Jan 20, 2020When an animation blueprint is using the "Linked Anim Graph" node and it's skeletal mesh has a post process animation blueprint the animation is played at the wrong playrate. Linked Anim Graphs wer ...
Failed to build in Github UE4.27.0.
UE - Runtime - Simulation - Aug 30, 2021Failed to build UE4.27.0 with Win64/Development Editor. Can avoid this error that excluding the project from build configuration. (Solution UE4->Properties->Configuration Properties->Configuratio ...
Force front x imported asset incorrectly display axis for thumbnail and default editor camera
UE - Editor - Open File Formats - Import and Export - Apr 12, 2021Thumbnail can be fix by (Quote from UDN) "adjusting OrbitYaw of the ThumbnailInfo for the +X-facing skeletal mesh" Persona Editors can be fix by (Quote from UDN) "setting SkeletalMesh->SetHasCustom ...
Widget With Spinbox Crashes When Destrcutor Is Called With Multithreaded Destruction Enabled
UE - Foundation - Core - UObject - Feb 28, 2020When a widget with a spinbox is calls it's Destructor with "Multithreaded Destruction" enabled the engine crashes. I have tested in 4.23.1, 4.24.3, and 4.26 Main with "Multithreaded Destruction" dis ...