Unreal Engine Issues
Unreal Engine Issues
Sampling textures with bias in the path of a custom data pin causes derivative operations when avoidable
UE - Rendering Architecture - Materials - Apr 8, 2025Materials that make use of the analytical derivatives path to avoid hardware derivatives can still generate derivative operations on texture samples when the shading model has a custom data pin and ...
[Stream Cache][Assert] - UnrealEditor_Engine!FCachedAudioStreamingManager::RemoveReferenceToChunk() [AudioStreamingCache.cpp:701]
UE - Audio - Stream Caching - Mar 12, 2024Found while messing around with a revamp of some of the Audio Stream cache tests. The map in this test is a WIP as I'm still just trying stuff out, but hit this assert 5/5 times.Assertion failed: Fo ...
Crash when calling FillDataTableFromCSVString() while viewing the contents of the data table
When the function UDataTableFunctionLibrary::FillDataTableFromCSVString() is used from Editor Utility Blueprints or Python Scripts, and the contents of the affected Data Table are currently being vi ...
Attached actor rotates incorrectly if the parent has negative scaling on one axis and more than 1.0 scaling on another
UE - Gameplay - Dec 27, 2016A child actor rotates incorrectly if the parent has negative scaling on one axis and more than 1.0 scaling on another. The child/parent relationship was created through the World Outliner. Licensee ...
Control Rig - Undo doesn't function correctly with proxy and multi bone controls
UE - Anim - Rigging - Control Rig - Oct 26, 2025Issue from my Technical Animator where the undo operation in Control Rig doesn't work as expected on Proxy Controls. He has recreated the issue using the "Control Rig Samples Pack" and recorded a vi ...
Custom Depth range is different than Pixel Depth range
UE - Graphics Features - Sep 25, 2025Shaders that compare custom depth and pixel depth get wrong output values because the ranges are different. This error is most noticeable over large distances. The difference in ranges is due to t ...
When using object lit by the Indirect Lighting Cache sometimes the cache will not load correctly for movable objects when a level is streamed that contains a landscape
UE - LD & Modeling - Terrain - Landscape - Jun 26, 2015When setting up a scene with a persistent level and any sublevel that contains a landscape that is loaded via load stream level node in the level BP can cause the ILC to not be correctly assigned fo ...
Replicated components spawned by CreateComponentOnInstance are broken by object reuse
UE - Gameplay - Apr 5, 2023When the gameplay framework component manager creates components as part of CreateComponentOnInstance, it passes in the requested class name as the literal name of the component instead of using the ...
DOF - TAA pass ghosting when using r.DOF.TAA.CoCBilateralFilterStrength
UE - Graphics Features - Aug 7, 2025In Unreal 5.6, there's a new CVar: r.DOF.TAA.CoCBilateralFilterStrength, which should help with ghosting artifacts introduced by TAA in DOF passes. However, it doesn't work as expected since many gh ...
Crash Importing Skeletal Mesh LODs with a lot of morph targets
OLD - Anim - May 18, 2016Crash Importing Skeletal Mesh LODs with a lot of morph targets Error message: Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 785] Array index out of bounds: 2 from an ar ...