SKP import - Mirrored groups will display with the default material in Keep Hierarchy imports

TM - Interoperability - Apr 10, 2025

Reported in SF [Link Removed] SketchUp models containing grouped elements that are mirrored will incorrectly display these elements with the default material when imported using the Keep Hierarchy ...

Negatively scaled box collisions render back faces in Player Collision debug view

UE - Simulation - Physics - Sep 1, 2025

The player collision debug visualization for negatively scaled boxes is rendering the back faces, not the front faces. The debug primitives are rendered via the dynamic mesh builder. FDynamicMeshBui ...

Disabling Cast Static Shadows on Stationary Lights causes dynamic shadows to not render

UE - Graphics Features - Shadows - Jan 3, 2023

Regression: Tested in UE5/Release-5.1, this issue occurs as well. The shadows render properly for the sphere when Virtual Shadow Maps is set as the Shadow Method, as well as when Ray Traced Shadows ...

CaseIssues with Korean input in Window 11

UE - Editor - UI Systems - Jun 14, 2023

When entering Korean in the EditableBox on Windows 11, the two Korean characters after pressing the Space key are not entered. I confirmed that it occurs in UE5.1 and UE5.2, and it does not occur i ...

Adding "Add Velocity" module to event handler stage causes ensure (ensureMsg)

UE - Niagara - Scripting - Dec 19, 2023

Adding a module which has Required Dependencies (such as "Add Velocity") to event handler stage causes ensureMsg. > > In system /Game/NewNiagaraSystem.NewNiagaraSystem, module AddVelocity (NiagaraN ...

SingleLayerWater Material crashes when sampling SceneTexture:CustomStencil.

UE - Rendering Architecture - Shaders - Sep 19, 2024

There is a texture mismatch between the expected texture samplers and actual texture samplers for SingleLayerWater materials that use the Material Function StencilMaskCompare. Also tested on UE5.5, ...

The ChaosCacheManager changes the bSimulatePhysics flag from the ObservedComponents and, if deleted, the change will persist, what can lead to confusion as observed physical entities will inadvertently stop simulating physics

UE - Simulation - Physics - Nov 26, 2024

The ChaosCacheManager (CCM) changes the bSimulatePhysics flag from the ObservedComponents and, if deleted, the change will persist, what can lead to confusion as observed physical entities will inad ...

Syncing issue when stopping and blending out a non-looping montage to an anim graph

UE - Anim - Gameplay - Feb 7, 2023

When syncing from a non-repeating montage that is blending out to an anim graph, the anim montage is marked as a follower due to having its PrevMaker as an AnimBoundary(-1), furthermore in this case ...

Parameters show up in material instances even if they're not supposed to be exposed

UE - Rendering Architecture - Materials - Feb 28, 2018

In this case, I've added inputs to a material function. That material function input uses a parameter as it's default value. [image: Inline image 1] When referenced in the shader[image: Inline ima ...