Switching LOD while using Evaluation Mode = Freeze in custom transit graph fails

UE - Anim - Runtime - Sep 14, 2021

If a user setups up a custom transition graph that caches one of the input poses by setting the Evaluator Mode property to Freeze then the node fails to deal with the situation where the LOD or mesh ...

HiResScreenshot has incorrect masking when screenshot resolution scale does not match the viewport.

UE - Rendering - RHI - Sep 6, 2021

After a bit of investigation, the way to fix this would be to modify MergeMaskIntoAlpha to pass in the actual resolution scale and the requested size, and only mask the overlapping pixels. Currently ...

Splitscreen View2 influences translucency in view 1

UE - Rendering - Sep 2, 2021

The videos + screenshots in the zip file show the issue on the modified gun sight. The licensee has provided a suggested fix here -[Link Removed] ...

>1ms increase in frame time with showflag.translucency , despite minimal translucency in the scene

UE - Rendering - Sep 2, 2021

Licensee reports this change, and can confirm a very rough similarity observed in a template project in 4.27: [Image Removed] ...

When the value of the TMap variable of the child blueprint is changed and compiled, it will restore to the default value of the parent blueprint.

UE - Gameplay - Blueprint - Sep 1, 2021

For TMap variables of type struct created in blueprint, if change the default value in child blueprint and compile, it will restore to the default value of the parent actor. This problem does not o ...

Strange Artifact under SingleLayerWater with dynamic directional light and LightPropagationVolumes

UE - LD & Modeling - Terrain - Water - Aug 30, 2021

upd. Regression was checked on //UE4/Release-4.26 CL 15973114, the issue was reproduced. Regression - No [Image Removed] ...

DistanceFieldBentNormalAO does not appear to work with imposter UVs

UE - Rendering - Aug 26, 2021

I have not entirely ruled out any issues with the imposter material in the repro, there's a chance this is related to the normal rotations, but turning off distancefields entirely does fix the issue ...

RGB/UINT10 HDR Format not using ST.2084

UE - Rendering - RHI - Aug 23, 2021

Specification here: [Link Removed] Which is mirrored in engine in FD3D12DynamicRHI::Init (for example): [Image Removed] However, FWindowsPlatformMisc::ChooseHDRDeviceAndColorGamut always returns ...

Pixelated volumetric translucent shadows

UE - Rendering - Aug 17, 2021

I narrowed down the issue to the Main call of ShadowProjectionPixelShader, and tested (on 4.26 and 4.27) a combo of different material and light shadow settings, as well as enabling transmission on ...

Vertex Interpolators broken in landscape materials

UE - LD & Modeling - Terrain - Landscape - Aug 17, 2021

D:/Unreal/UE4_Release-4.27/Engine/Shaders/Private/LandscapeVertexFactory.ush(788,3-59): Shader FDebugViewModeVS, Permutation 0, VF FLandscapeVertexFactory[Image Removed]:/Unreal/UE4_Release-4.27/Eng ...