Unreal Engine Issues
Unreal Engine Issues
NavMesh does not build correctly to SkeletalMesh collision
UE - AI - Mar 16, 2015NevMesh cuts out holes for collision incorrectly with Skeletal Meshes. Skeletal Meshes with "Can Ever Affect Navigation" set to true and that have a Physics Asset are capable of causing this. ...
[Groom] Very thin hair has incorrect raytraced shadow on edges
UE - Graphics Features - Lumen - Jun 8, 2020This only happens when 1) Hair Width is very small. e.g. 0.01 in the example 2) Light has raytraced shadow and Samples Per Pixel has a value > 1. e.g. 8 in the example The problem seems to be rel ...
Streaming Virtual Texture UDIN V Offsetting
UE - Editor - Content Pipeline - Import and Export - Jan 31, 2024UDIN virtual textures appear to have row 0 (U coordinate [0 - 1) swapped to the other side of the texture vertically. ...
Local Variable loses value after reference moves file location
UE - Gameplay - Blueprint - May 23, 2017Local Variable loses value after reference moves file locations. This does not just affect construction scripts, following these steps with a function instead produced the same result. This issue do ...
[Material Substitution] Missing Material IDs in exported CSV in 2025.2
TM - Interoperability - Oct 7, 2025Reported in SF [Link Removed] When exporting material IDs in 2025.2, downloaded materials appear to be missing from the exported CSV. In 2025.2, it appears that only local materials are included i ...
LeapHandGrabbing comment is different than actual used value for hand grabbing.
UE - Platform - XR - Oct 24, 2016The comment for LeapHandGrabbing( ) states grab strength is 0.5 when HandClosed( ) only returns true when grab strength is equal to 1.f. ...
Adding SmartObjectZoneAnnotationComponent to a blueprint actor causes a crash when building the package
UE - AI - SmartObject - Jan 30, 2025If placing an actor with SmartObjectZoneAnnotationComponent added to blueprint actor in a level, it will crash when the level open. As a workaround, adding SmartObjectZoneAnnotationComponent to the ...
MoveToActor doesn't update AI's path on goal actor's move
UE - AI - Mar 16, 2015A number of issues with MoveToActor have been observed in 4.7.2, including: 1. Not updating path on goal actor's move 2. hitting obstacles after path updating ...
Using LOD for Per-Poly collision doesn't work
UE - Simulation - Physics - Aug 11, 2016When choosing LODs for per-poly collision the static mesh stops blocking actors in the level. I tested this on 4.13 preview 1 and it is still an issue. I used the 3dsMax workflow for this process ht ...
iOS apps crash on devices with iOS version 11.2.2 when Metal 2.0 is enabled
UE - Platform - Mobile - Jan 22, 2018Launching an iOS App that is set to Metal 2.0 on a device with iOS version 11.2.2 causes the app to crash and return to the home screen. This was tested on an iPad Pro as I do not have access to any ...