Unreal Engine Issues
Unreal Engine Issues
Niagara module "Beam Emitter Setup" makes attribute Emitter.BeamID flick between -1 and LoopCount every frame
UE - Niagara - Mar 6, 2026When working with beam and ribbon effects in Niagara, Emitter.BeamID is used to fill Particles.RibbonID so that a looping emitter can spawn multiple discrete beams. Emitter.BeamID is assigned by mod ...
The visibility state of on-screen stat messages is not restored correctly after entering and leaving PIE. This also affects other important on-screen messages like map warnings and debug messages.
UE - AI Workflows - UI Systems - Nov 28, 2024Currently, the ShowStats viewport option is automatically enabled when entering PIE and automatically disabled when exiting PIE. This forced disabling happens even if the option was enabled prior to ...
Nav Modifier Volume Not Affecting Nav Mesh Until it is Moved
UE - AI - Oct 21, 2016Nav Modifier volumes are not affected the nav mesh until they are moved from their initial placement position. Found in 4.13.1. Reproduced in 4.12.5 and 4.15 Main CL 3163223 This is similar to [Li ...
Bloom/Specular difference with same content between 4.8 and 4.9
UE - Graphics Features - Dec 4, 2015A licensee reported a visual difference, possibly related to bloom or specular when updating from 4.8 to 4.9[Image Removed] After looking at it with Visualize HDR on, Martin commented the following ...
'Greater/Lesser Than or Equal To' nodes do not work consistently with values lower than 1
UE - Gameplay - Jun 8, 2015'Greater/Lesser Than or Equal To' nodes do not work consistently with values lower than 1 Note: The issue isn't present with whole numbers (ex: 10 decremented by 1) ...
Strange Behavior for LayeredBlendPerBone when Blend Pose 0 and 1 are in the same hierarchy
OLD - Anim - May 25, 2017With Layered Blend Per Bone, if the bone for Blend Pose 1 is in the hierarchy below the bone for Blend Pose 0, then the Blend Weights have some odd behavior. Blend Pose 0 = root Blend Pose 1 = spin ...
Converting Project from 4.11 to 4.12 and Above Changes Relative Scale of Sockets to 1
UE - Gameplay - Sep 21, 2016When converting a project from 4.10/4.11 to 4.12(or later) the relative scale of the sockets on skeletal meshes will be changed to 1,1,1 regardless of the previous settings. ...
"Skip Assigning Gamepad to Player 1" Setting causes Force Feedback events to be incorrectly routed
UE - Gameplay - Input - Mar 13, 2018The engine still uses the default index for calling force feedback events, despite them being assigned from player 1 on out. Which is why event on player 1 goes to player 0, event on player 2 goes t ...
Foliage 'BlockAll' instanced static meshes do not affect NavMesh
UE - Runtime - Character - Feb 27, 2024When placing static mesh foliage and setting the foliage mesh's Collision Preset to Block All, the placed meshes do not consistently block parts of the nav mesh. Expected: Placed meshes (for examp ...
LODs with screen size 0 in legacy assets are incorrectly converted to 1 on load
UE - Editor - Content Pipeline - Sep 11, 2025When loading a mesh asset (static or skeletal) created in an old version of Unreal (e.g. 4.10), any LOD whose LOD screen size was originally set to 0, is converted to 1. This causes LODs that would ...