Unreal Engine Issues
Unreal Engine Issues
anim notify states are triggered when updating thumbnails
UE - Anim - Runtime - Feb 19, 2026The issue is that FAnimationSequenceThumbnailScene::SetAnimation calls referesh bone transforms which will trigger notify states present at the midpoint of the animation (as the thumbnail code sets ...
Mover | FStanceModifier adjustment teleport on Crouch/Uncrouch can fail when child components intersect world
UE - Gameplay - Player Movement - Mover - Feb 3, 2026Context When crouching and uncrouching with Mover’s DefaultMovementSet, the pawn capsule’s half height is changed. This behavior mimics the CharacterMovementComponent. To ensure the pawn’s feet sta ...
Compatible Skeleton Animation does not retarget the same on duplicate skeleton
UE - Anim - Rigging - Retargeting - Jan 29, 2026If a mesh is exported from the engine, reimported as a new skeleton and mesh, and then marked as a compatible skeleton. Animation will have slightly different rotations playing on the skeleton. ...
Incorrect geometry for OnMouseMove event on Slider with RightToLeft flow direction
UE - Editor - UI Systems - Slate - Jan 28, 2026When a slider is in RTL flow direction, and thus its position is changed, the handle is not drawn at the correct position during mouse drag. Instead, the handle draws as if the slider was not moved ...
[Enhanced Input] The action instance data is incorrectly reset when you call "Add mapping context" on the same mapping multiple times
UE - Gameplay - Input - Jan 16, 2026This is somewhat related to [Link Removed] Closed and was brought up by a [Link Removed] Setting the CVar input.bRespectIM ...
Skeletal Mesh BLAS updates when not animating
UE - Rendering - Architecture - RHI - Dec 19, 2025The BLAS for Skeletal Meshes that don't move, or tick get updated every frame even if the animation and skin cache aren't updated. This adds over 1ms to update time. The only exception is if the sk ...
[AI] Gaps between Nav Mesh tiles in World Partition map causing movement issues
UE - AI - Navigation - Nov 4, 2025Navmesh has seams between some tiles that are actual edges rather than previously found "gaps" where it was a debug rendering issue. Pathfinding does fail between these tiles to go straight across. ...
bStaticWhenNotMoveable in Lighting category instead of Physics
UE - Simulation - Gameplay - Oct 24, 2025"UPrimitiveComponent::bStaticWhenNotMoveable"'s category is set to Lighting, not Physics. This causes it to be hidden when lighting-related properties are hidden, even though it controls physics sta ...
Extend Worldpartition Editor Grid Widget
UE - World Creation - Worldbuilding Tools - World Partition - Oct 14, 2025Licensees are looking into ways of adding visualizations to the editor worldpartition grid widget. In one example case, just adding some lines to show which parts of the wp minimap belong to which s ...
Dithered LOD transitions do not work when the camera's field of view changes
UE - Graphics Features - Jun 12, 2025Dithered LOD transitions do not work when changing the camera's field of view and cause artifacts when both the FOV and camera distance to the object are changed simultaneously. ...