Unreal Engine Issues
Unreal Engine Issues
NavMesh does not update properly when "Can Ever Affect Navigation" is toggled
UE - AI - Mar 27, 2015if I place a mesh with "Can Ever Affect Navigation" set to true, then set it to false, it will leave the NavMesh with a bugged "hole" that AI does not path around correctly (causing the "Blocked" er ...
Materials with Subsurface Profile not affected by Opacity value
UE - Graphics Features - Oct 24, 2017A material with Shading Model set to Subsurface Profile is no longer affected by Opacity value in 4.17, 4.18, and 4.19 (Main) but was previously working as intended in 4.16. This is a regression. ...
Shader Model 5 and Tessellation causes unintended effects on Linux
UE - Platform - Linux - Jul 6, 2016Using Shader Model 5 and tessellation on Linux gives strange results that are not present when used on Windows ex: 1) When using Shader Model 5 on Linux, turning on Translucent blend mode and Tesse ...
Incorrect restitution behavior for physical material set to 1 whereby momentum is gained during the simulation
UE - Simulation - Physics - Mar 24, 2015Setting a restitution of 1 for a ground material and a restitution of 1 for a ball that bounces on the ground should keep the ball bouncing at the same height consecutively. Over the course of time ...
Crash on BP recompile after deleting struct property with instanced object
UE - Gameplay - Blueprint Compiler - Jan 5, 2023A user has reported a crash that is reproducable in a clean project in UE 5.1.0 release. It involves a struct with an instanced object. The crash occurs after deleting a property of that struct type ...
Content Examples: Blueprints_Overview Stand 1.7 Spark particle system does not fire from coin
Docs - Samples - Jan 19, 2017During runtime, the red coin in Stand 1.7 on the Blueprints_Overview map of Content Examples should emit a large spark particle system 5 times. While investigating, I tried disabling "Use Fixed Rel ...
UE 5.6 broke the Collaborative Viewer Template pawn's Mouse Look
UE - Content - Template - Aug 24, 2025UE 5.6 broke the Collaborative Viewer Template pawn's Mouse Look. Creating a 5.6 project based on the Collaborative Viewer Template and Playing-In-Editor, we notice that the Mouse Look functionality ...
Point lights affect indirect lighting on RTGI much less than other types of lights
UE - Graphics Features - Lumen - Aug 4, 2020Only point lights affect indirect lighting on RTGI much less than other types of lights.[Link Removed] Indirect lighting of baked lightmaps look much stronger than RTGI.[Link Removed] Apparently, ...
Vehicle Template with Thruster Configuration will be affected by force relative to the distance from the origin
UE - Simulation - Physics - Mar 18, 2025Vehicle Template vehicle with added Thruster Configuration to its VehicleMovementComponent will be affected by force relative to the distance from the origin. At around 200000 the force is enough to ...
UE 5.5 delayed Python initialization causes issues
UE - Editor - Workflow Systems - Oct 28, 2024From this UDN: [Link Removed] The customer reports that this issue did not happen in 5.4. ...