Unreal Engine Issues
Unreal Engine Issues
Update Mesh Section incorrectly sets vertex colors for a Procedural Mesh
UE - Graphics Tools - Modeling Tools - Jun 21, 2022This is a regression tested in //UE4/Release-4.27 CL#18319896 Update Mesh Section incorrectly sets vertex colors for a Procedural Mesh. The closer a colors R, G, or B value is to 1.0 or 0.0 the mor ...
[CrashReport] Assertion failed: TaskDataArray.Num() == Exporter->VolumetricLightmapTaskGuids.Num()
UE - Graphics Features - Lumen - Oct 2, 2017This is a trending crash coming out of the 4.18 Previews. Users have not provided any descriptions of their actions when the crash occurred, but at least two of the affected projects are being creat ...
Bake To Control Rig on a Spawned Actor in a Subsequence with Play Range that exceeds the Subsequence causes a Crash
UE - Anim - Anim in Engine - Jun 28, 2023This is a Regression. Tested in //UE5/Release-5.1 CL23901901 Using Bake To Control Rig on a Spawned Actor in a Subsequence with Play Range that exceeds the Subsequence causes a Crash. ...
Crash after creating a suboject for RootComponent if the actor is placed on the level
UE - Foundation - Cpp Tools - Hot Reload - Nov 6, 2020The crash occurs when trying to assign a new value to RootComponent if the Pawn is already placed on the level Crash does not happen in P4 //UE4/Release-4.25.3 CL 13942748 Other steps to reproduc ...
Curves in compressed additive animations interpolate incorrectly when two keys in a row have the same value
OLD - Anim - Oct 16, 2019Curves compressed from additive animations will not interpolate correctly if they have two keys in a row with the same value. The second key will be ignored, leading to the curve interpolating earli ...
Crash retargetting AnimBP with "Allow remapping to existing assets" enabled
OLD - Anim - Aug 24, 20164.12 version of the crash: [Link Removed] Error message: Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 833] Array index out of bounds: 1 from an array of size 0 Sourc ...
Missing PSO Precaches in the engine
UE - Rendering Architecture - RHI - Aug 20, 2025A licensee wanted to report some missing PSO Precaching they found, which they have fixed locally: 1. UCableComponent doesn't implement CollectPSOPrecacheData or call CheckPSOPrecachingAndBoostPri ...
Ambiguous Search Warning After Recompiling Blueprint of an Object Involved in a Level Sequence
UE - Anim - Sequencer - Apr 18, 2017The licensee is receiving an ambiguous search warning after recompiling the blueprint of an object involved in a level sequence that is contained in a hidden sublevel (which is then loaded and made ...
Android crash a couple minutes into StrategyGame
UE - Platform - Mobile - Mar 8, 2016This didn't occur on iOS; so far this has only been tested in StrategyGame The device this occurred on was Nexus5X_6713_Adreno 418, 6.0.1 It did not occur on: iPad Mini 4_6242, 9.2.103-08 14:12:0 ...
Instanced Static Meshes ignore max World Position Offset Displacement for bounds after UpdateInstanceTransform is called
UE - Graphics Features - Jun 18, 2025When an Instanced Static Mesh Component (ISMC) uses a material with a non-zero Max World Position Offset Displacement, the bounds are correctly expanded at initialization. However, after calling Upd ...