Nanite cast shadows from all lights, regardless of lighting channel configuration

UE - Graphics Features - Nanite - Dec 4, 2023

This behavior is inconsistent with the behavior of non-nanite meshes, which receive light and cast shadows only from lights in the same lighting channel. [Image Removed] ...

HLOD Build crashing when building nanite for mesh with 2 material having the same parameters

UE - World Creation - Worldbuilding Tools - HLOD - Dec 2, 2023

From Licensee: Catching the exception with debugger allowed us to find a list of materials on the hlod mesh on which the error occured and we were then able to link it to one of our meshes causing ...

Volumetric fog flicker side screen

UE - Rendering Architecture - Nov 29, 2023

The flicker is visible in Epic scalability as well, it is just smaller on screen because the fog voxels are smaller (r.VolumetricFog.GridPixelSize). ...

UMovieSceneDMXLibrarySection::GetFixturePatches returns invalid patches

UE - Virtual Production - IO - DMX - Nov 28, 2023

UMovieSceneDMXLibrarySection::GetFixturePatches() returns an invalid patch as follows. The if condition needs to be corrected.  TArray<UDMXEntityFixturePatch*> UMovieSceneDMXLibrarySection::GetFixt ...

Delayed movement adjustment can include incorrect movement mode

UE - Gameplay - Player Movement - Nov 27, 2023

It's possible for the server to send a client's character a movement correction with the wrong movement mode.  This can occur if a project has client adjustment throttling settings enabled:  Networ ...

Ensure in GatherSubobjectData

UE - Gameplay - Nov 27, 2023

An ensure in GatherSubobjectData is being hit under certain inheritance conditions. This appears to be similar and potentially related to [Link Removed] and the fix at CL 16377852. Stepping through ...

Luminance coefficients used throughout the engine not matching sRGB standard

UE - Virtual Production - Rendering - Color - Nov 27, 2023

This is causing confusion when working with color in UE5, specifically when validating for HDR between different reference materials. It has also been noted that the color primaries in PAL and NTSC ...

UToolMenus::GenerateWidget can crash while calling PopulateMenuBuilder

UE - Editor - Workflow Systems - Nov 24, 2023

A user reported that UToolMenus::GenerateWidget will crash if UToolMenus::AddReferencedObject is called during the construction of a menu. Using the above in-code repro steps, I can repro this in a ...

Material containing null expressions crashes when launching the editor with the -Game flag

UE - Rendering Architecture - Materials - Nov 23, 2023

This comes from a UDN report. [Link Removed] When launching the editor with -game, if a material contains a null expression (for instance because that material expression has been removed), the bin ...