Unreal Engine Issues
Unreal Engine Issues
Unreal Editor crash on Datasmith import with VrayBlend Materials
UE - Editor - Content Pipeline - Datasmith - Importer - Jun 16, 2020It seems like VrayBlend materials are crashing the Engine when importing them with Datasmith. This is a regression from 4.24.3 (CL-11590370) where the file imported successfully. This was reported ...
Changing transform of simulated component during physics freezes motion
UE - Simulation - Physics - Oct 13, 2016If something is executed before a SetActorRotation node on Tick inside of a SceneComponent class BP and then added to an Actor class BP, the physics will lag User Description: When using set rotat ...
Multiple Planar Reflections are not captured when forward shading
UE - Graphics Features - Oct 25, 2019After enabling forward shading, having two planar reflections in the scene causes one instance to not render properly. Tested in 4.22.3 (CL - 7053647), 4.23.1 (CL - 9631420), 4.24 (CL - 9828119), 4 ...
Inventor Assembly imports incomplete or missing geometry
UE - Editor - Content Pipeline - Datasmith - Importer - May 22, 2020It seems that UE4 has a problem with importing Inventor Assemblies and Subassemblies. Files are either the wrong orientation or missing their geometry completely. This was reported and tested in 4 ...
FStateTreeExecutionContext::GetDebugInfoString() outputs wrong info and crashes when using linked state trees
UE - AI - Debugging - Apr 17, 2025When using State Trees, the AI Debugger can be accessed during play to show information about their current execution state. If a behavior tree is currently in a state that references a linked tree, ...
Incorrect shadow on movable objects with ES3.1
UE - Platform - Mobile - Jan 10, 2020While in ES 3.1 - lighting on movable meshes from static directional light appears to be rotated 90 degrees. The direction of light on movable mesh, both static mesh and skeletal mesh, doesn't match ...
Large Landscapes using World Composition have weird LODs when streamed out and back in
UE - World Creation - Worldbuilding Tools - World Composition - Mar 13, 2020When World Composition Sublevels are streamed out and back in the LODs appear distorted. This reported and tested in 4.24.3 (CL-11590370). This was reproduced in 4.23.1 (CL-9631420), 4.25 Preview ...
[AI] Nav Modifier Volume inside of a Level Instance does not update navmesh when moved
UE - AI - Navigation - Oct 3, 2023The issue is seen when using a normal navmesh inside of a World Partitioned level. Adding a Nav Modifier Volume to a Level Instance, and placing the Level Instance in the world will affect the navme ...
BSP brushes get Clipped or Disappear relative to the Surface Normals of a nearby Brush when Deleting/Flipping Faces
UE - LD & Modeling - Modeling Tools - BSP - May 1, 2017While testing this issue it was interesting to discover how the surrounding BSP's were affected. They seemed to clip/disappear according to the surface normals of the deleted brushes. There is a si ...
Texture Group MaxLODSize doesn't recognize changes to WorldNormalMap in DefaultDeviceProfiles.ini
UE - Foundation - Core - Nov 11, 2019When trying to change the MaxLODSize using DefaultDeviceProfiles.ini, some of the groups scale but others don't. This was reported and tested in 4.23.1 (CL-9631420). This was reproduced in 4.22.3 ...