Unreal Engine Issues

RectLight SourceTexture quality degredation when re-enabling

Crash when breaking Level Instance within Data Layer Asset

A crash occurs when breaking a level instance contained in a data layer.  This does not occur in 5.0.3, however the behaviors of Data Layers are different in 5.1 where the Data Layer asset is added ...

Components copy/pasted from an actor instance's SCS can't be deleted from a Blueprint

SCS added components pasted from an actor instance in the level editor cannot be deleted from the target Blueprint because the component template has the RF_ArchetypeObject flag. ...

MoviePipeline: Incorrect Caching of Min/Max World Delta Time

To test this issue: Create a C++ class WolrdTimeDilationDebugActor.h in your Project with the following code:// Copyright Epic Games, Inc. All Rights Reserved. #pragma once #include "CoreMinim ...

Debugging Motion Matching in 5.1, looping animations don't loop root correctly

Just trying a few simple animations in 5.1, I have a few short looping cycle animation that go in different directions. I see very bad results and it looks like it's because of how MM is assuming th ...

World partition mini map fails to build with an Unhandled Exception while using r.Raytracing.Nanite.Mode=1

This is a regression. Tested in //UE5/Release-5.0 CL20979098 Build mini map fails with an Unhandled Exception while r.Raytracing.Nanite.Mode=1 is enabled in the DefaultEngine.ini. ...

LOD ScreenSize per platform is not reflected in the mobile preview

in 5.0 or 5.1, MinimumLOD  per platform can be previewed in the mobile ES3.1 preview mode, but It seems that the LOD ScreenSize per platform is not reflected in the mobile preview. ...

MRQ - Groom Issue with Stencil Layers

There is a problem with rendering Grooms bound and attached to animated skeletal meshes when the mesh belongs to a stencil layer in both the Deferred Renderer or the Path Tracer. The groom does not ...

Fbx Importer: Need to clamp incoming vertex color

When used with First Loop Start Frame Offset and Use Animation Blueprint, the character will alternate between the specified animation and the reference pose

If you use StartFrameOffset set to 1 or higher in conjunction with the Use Animation Blueprint, the character's animation will be rough towards the end of the section. Specifically, it seems that th ...