Unreal Engine Issues
Unreal Engine Issues
CharacterMovementComponent: simulated proxy can go into falling due to linear velocity quantization when using custom gravity
UE - Gameplay - Components - Mar 8, 2024The character movement component in void UCharacterMovementComponent::SimulateMovement(float DeltaSeconds) evaluates whether to find the floor when simulating the movement of the simulated proxy ...
Transform Origin Scale on the Level Sequencce Actor's Instance Data can affect rotations
zComponent - Archive - Apr 30, 2025Scale is used as part of the rotation calculation for transform multiplication, and it can have an effect in the sequence transform origins. It's expected that scale is completely ignored, and shou ...
Painted foliage in a level instance can be selected in Foliage mode if the level instance is in main level, and foliage is duplicated if moved.
UE - World Creation - Worldbuilding Tools - Foliage - Sep 16, 2025Context Foliage Mode is a set of tools that enables you to quickly paint or erase sets of Static Meshes or Actor Foliage. Level Instancing is a level-based workflow designed to improve and streamlin ...
Incorrect geometry for OnMouseMove event on Slider with RightToLeft flow direction
UE - AI Workflows - 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 ...
Selecting a brush surface that is flush with other brush surfaces selects all of them after Building Geometry
UE - LD & Modeling - Modeling Tools - BSP - Sep 1, 2016This issue was reported by internal UT developers. When selecting the surface of a brush that share flush surfaces with other brushes, all surfaces are selected. This seems to only occur after sel ...
GPU Visualizer is being clipped in VR Preview
UE - Platform - XR - Sep 9, 2016Found by internal developer. The GPU Visualizer window is being clipped, making it unusable while in VR Preivew. This works find in Play in New Window. ...
Preformance drop when calling draw to render target
UE - Graphics Features - Jun 19, 2018There is a major performance drop after 4.18 when calling draw material to render target. This is an issue reported by many community members, and there seem to be additional reports with different ...
Spline Mesh Collision doesn't work in packaged game when spawning them at runtime
UE - Simulation - Physics - May 18, 2020Spline Mesh Components lose their collision in a packaged game when spawning them at runtime, or modifying them via 'Set Start and End' function at runtime. ...
Editor preview safe zones for notched iPhones do not match those used at runtime
UE - Platform - Apple - Dec 4, 2020Hi, on iOS we ask the device for its cutout regions, but the values returned by the device can be overridden using the SafeZone.Landscape.* cvars. However these are on-device only settings. When th ...
Reparenting an actor BP to EditorUtilityActor does not give access to editor utility nodes
UE - Framework - Blueprint Editor - Jul 11, 2022Ran into this while answering a UDN. A user was expecting to find the blueprint functions available to Editor Utility Blueprints after reparenting their actor to EditorUtilityActor. I confirmed that ...