Unreal Engine Issues
Unreal Engine Issues
USD Export – Support exporting all UDIM tiles when using “Bake Materials”
UE - Editor - Open File Formats - Sep 15, 2026Hi, I noticed an issue when exporting USD assets that contain materials using UDIM textures. When exporting USD, the “Bake Materials” option allows me to export the base textures and relink them c ...
Visibility managemente in USD Stage Actor
UE - Editor - Open File Formats - Sep 15, 2026Working with a big USDStageActor is complicated due to visibility management. We are importing "simple" environments from usd files through the USDStageActor. However, when the artist wants to hide ...
Issue with importing alembic files: the skeletal mesh asset doesn't contain LOD description
UE - Editor - Open File Formats - Sep 15, 2026Helloo everyone!! 😄 We are experiencing an issue with importing skeletal meshes from alembic. For reference, this issue happens in vanilla engine 5.7.4, but it doesn't occur in versions 5.6.x. 1) ...
SceneCaptureComponent2D destroys shared Lumen Radiosity atlases every frame, breaking temporal accumulation in the main view
UE - Rendering - Features - Lumen - Sep 14, 2026A USceneCaptureComponent2D with bCaptureEveryFrame = true and default post process settings causes FLumenSceneData::IndirectLightingAtlas and RadiosityNumFramesAccumulatedAtlas on the sharedScene->D ...
Collection Manager's GetAssetsInCollection returns nothing for dynamic collections
UE - Editor - Sep 12, 2026Custom Debug Camera Is Not Respected If Set Anywhere Other Than Code
UE - Gameplay - Gameplay Cameras - Sep 11, 2026The correct debug camera is no longer used if the class is set in a config file or within the Editor. When the debug camera is toggled on, the default will be used instead. If the class is set in co ...
Scrubbing the timeline in Sequencer can hang the editor when operating on constrained actors with complex control rigs
UE - ACT Character - Anim in Engine - Sep 11, 2026The issue is caused by UAnimDetailsProxyManager::ForceUpdateProxyValue triggering evaluation of constraints that are attached to control rigs. When scrubbing, requests to ForceUpdateProxyValue are ...
Race condition in GetFunctionSig_Write() and other function signatures
UE - Rendering - Architecture - Niagara - Sep 11, 2026A race condition exists in GetFunctionSig_Write() and other places where FNiagaraFunctionSignature is lazily initialized because multiple worker threads can progress past if (!Sig.IsValid()) and st ...
Motion blur artifacting in MetaHuman Crowd demo
UE - Rendering - Features - Sep 10, 2026This issue was reported by a licensee and we also hit it during dev work on the crowds demo. It seems that this may be a general issue with motion vectors and teleporting actors as there are variou ...
LevelInstance\PackedLevelActor: Problem with non-uniform negative scale.
UE - Engine Scaling - Streaming - Sep 10, 2026A licensee is reporting transform issues related to using non-uniform negative scale on LevelInstances and PackedLevelActors. ...