Unreal Engine Issues
Unreal Engine Issues
Duplicating BP actors reset edited Variables to Default Value if Variables name start with Chinese Character
UE - Foundation - Core - Jul 29, 2020Hints: It has no problem in 4.24, only happening in 4.25 It has no problem as long as the Variable name is contained with Alphabat(English characters) fully; or start with Alphabat(A_变量 is fine) ...
Shadow Flickering with Lighting Channels
UE - Rendering - Features - Shadows - Oct 27, 2023It looks like static meshes can invalidate large numbers of VSM pages when the geometry and the light are not on light channel 0. ...
NavMesh generation should not care for Actors that are hidden in the Editor.
UE - Runtime - Character - Aug 5, 2025The problem is that the Cube is still loaded but "HiddenEd". It's AActor::bHiddenEdLayer property is set to true by the WorldPartition System. The Actor is dirty which makes the WP system pin it (wo ...
AbilitySystemComponent::RepAnimMontageInfo causing push model validation ensure
UE - Gameplay - Gameplay Ability System - Jun 12, 2026When iterating through the struct’s properties to check if the values have remained the same, it seems as though the SectionIdToPlay has changed, causing validation to fail (see attached log snippet ...
Skeletal Meshes display Vertex Paint in RGB Color View Mode without being selected
OLD - Anim - Apr 26, 2017Skeletal meshes display Vertex Paint in RGB Color View Mode without being selected. This is inconsistent with Static Meshes, which must be selected prior to showing their Vertex Paint. ...
Regression: Shader compile failure with SceneDepth in mobile and PC, ES3_1
UE - Platform - Mobile - Nov 30, 2018SceneTexture:SceneDepth node is not properly compiled in ES3_1. Regression? yes, It is working in 4.20.3 launcher version. This log come up with compile failure LogMaterial: Display: Missing cache ...
The speed and delay of Animators is increased in exports when the scene contains 3D Grass
TM - Rendering - Jul 23, 2025Reported in SF [Link Removed] For animators (translators and rotators), when the scene contains the 3D Grass materials, videos exported from the scene will display animators delay and speed up abou ...
Max Deviation setting is never used for Mesh Reduction, causes incorrect values for automatically computed LOD distances
UE - Graphics Features - Feb 1, 2018The Max Deviation setting for a static mesh LOD is never used for Mesh Reduction. This results in incorrect values for automatically computed LOD distances, because the calculation uses the Max Devi ...
Float RGBA Framebuffer rendering settings changes UI
UE - Editor - UI Systems - Slate - Nov 11, 2019When changing the rendering Frame Buffer Pixel setting from "10 bit RGB 2 bit alpha" to "Float RGBA". The Editor's UI will change. (Please see the attached screenshots for comparison) ...
Crash in Persona when adding Notifies
OLD - Anim - Apr 14, 2015REOPENED NOTES: Crash Reporter: [Link Removed] Test Project: [Link Removed] Open project and press Play: Editor will crash. User reports this being due to sequential animations not being the sam ...