Nanite Tessellation Artifacts With Landscapes

UE - Graphics Features - Nanite - Dec 4, 2024

There seems to be an issue with how Nanite tessellation and Landscape interact with two sided landscapes. When the camera's near clipping plane is past the landscape's surface the displacement of th ...

Global SkyAtmosphere and Clouds Issues (Cloud Shadows)

UE - Graphics Features - Dec 3, 2024

Sampling Cloud Shadows when rendering the Sky Atmosphere can incorrectly assume that the view is located at the planet's North Pole. This causes distortion in the shadows when using a sphere-shaped ...

Global SkyAtmosphere and Clouds Issues (Ambient Light)

UE - Graphics Features - Dec 3, 2024

Ambient Light on Volumetric Clouds from Sky Atmosphere always is calculated as if the clouds are at the north pole of the planet. Using a sphere-shaped Sky Atmosphere and Volumetric Clouds causes t ...

Physical Material Mask bug found in GetPhysMatIndex, potentially causing issues with lookup.

UE - Simulation - Physics - Dec 2, 2024

On line 408 of UPhysicalMaterialMask::GetPhysMatIndex() in PhysicalMaterialMask.cpp, the AdjustCoord() function is given AddressX for both the U and V coordinates. The AddressY input is never used i ...

Nanite Mesh Reduction Issue

UE - Graphics Features - Nanite - Nov 28, 2024

This issue was reported through a UDN. Licensee mentioned that they are seeing a hole in their Nanite mesh at as they move away from it. Using the Nanite debug view we observe at a certain distance ...

Editor Performance issue : Loading/unloading multiple Levels / Level Instances triggers each time a call to FActorFolders::RebuildFolderListForWorld

UE - World Creation - Worldbuilding Tools - Level Instances - Nov 25, 2024

Revisit how FActorFolders are updated when loading/unloading Levels (level instances). The code should maintain the folder list instead of rebuilding everything. ...

Editor preview window for CurveLinearColorAtlas does not automatically update when their CurveLinearColor asset is changed

UE - Graphics Features - Nov 12, 2024

When the CurveLinearColor asset assigned to a CurveLinearColorAtlas is edited (e.g. change the colors of the gradient), the preview window of CurveLinearColorAtlas editor does not automatically upda ...

Skeletal Mesh Customizable Object Node does not warn of changes to mesh sections.

UE - Anim - Mutable - Nov 12, 2024

When reimporting meshes with changes to their material sections, specifically additions, there is no indication that there will be an issue on output of a generated mesh. Ideally, we can watch for a ...

Actors removed from the world are unregistered both before and after EndPlay

UE - World Creation - Worldbuilding Tools - Nov 5, 2024

Actors that are removed from the world have UnregisterAllComponents called twice. Removal can be caused by unloading a data layer that owns the actor. In cases like exiting the application or destr ...

Null Material Layers in Material Instances cause Opacity Mask and WPO to break on Nanite Meshes

UE - Rendering Architecture - Materials - Oct 31, 2024

When a Material Instance is loaded that has a nullptr layer in StaticParametrs.Materiallayers.  The Material Instance will create it's own CachedExpressionData but the ConnectedParameterMask will be ...