Duplicating skeletal mesh assets with groom in world outliner changes Hair UV layout

UE - Rendering - Materials - Dec 10, 2021

Having duplicate characters with groom, hair UV layout changes which results in visible shift in character look and also changes color based on camera distance and lights in the scene (hair would fl ...

Linear Color Struct values are changed when upgrading from 4.26.2 to 4.27.1

UE - Gameplay - Blueprint - Dec 2, 2021

It seems that changing the value to something different than the default of a Linear Color Struct variable, results in the value being changed when upgrading the project to a new engine version. Thi ...

Path Tracing denoiser is not stable in animation

UE - Rendering - Nov 30, 2021

When rendering an animation with the path tracer through MovieRenderQueue, at low sampling rates the denoiser produces splotchy results that flicker from frame to frame. The current denoiser (Ope ...

Path Tracing - HDRIBackdrop contributing twice

UE - Rendering - Nov 30, 2021

The setup for HDRIBackdrop leads to double-counting of the illumination between the skydome and the geometry in the path tracer. ...

Steam Sessions fails to create when using the Create Session node

Docs - Nov 30, 2021

This is a Regression. 4.26.2 - Binary - no issue creating a session. 4.27.1 - Binary - no issue creating a session if you convert a previously working 4.26.2 project. 4.27.1 - Binary - Fails to c ...

Multiple Blueprint compilation passes required to fix up event binding to dispatcher after event rename

UE - Gameplay - Blueprint Compiler - Nov 30, 2021

Renaming a custom event bound to an event dispatcher via a Create Event node requires two compilation passes to fix up the binding.  upd. Regression was checked on //UE4/Release-4.26 CL 15973114, i ...

Color samples are not displayed when switching to light complexity view.

UE - Rendering - Nov 25, 2021

In other views, such as Shader Complexity, color samples are displayed. ...

Crash using D3D raytracing with Support Ray Tracing unchecked static mesh

UE - Rendering - Nov 24, 2021

Static mesh that does not have Support Ray Tracing flag does not have a GeometryRHI object. So it causes a crash in FD3D12RayTracingScene. Excluding instances that do not have a GerometyRHI in FDef ...