Modifying PostProcess Film Slope can cause TSR to produce ghosting artefacts

UE - Graphics Features - Aug 11, 2025

When TSR is active, the scene is dark, and a foreground object is lit, modifying the Film/Slope value on a PostProcessVolume can lead to TSR ghosting. TSR occurs prior to Tonemapping, so the issue ...

DOF - TAA pass ghosting when using r.DOF.TAA.CoCBilateralFilterStrength

UE - Graphics Features - Aug 7, 2025

In Unreal 5.6, there's a new CVar: r.DOF.TAA.CoCBilateralFilterStrength, which should help with ghosting artifacts introduced by TAA in DOF passes. However, it doesn't work as expected since many gh ...

Blurry RVTs after camera jump

UE - Graphics Features - Aug 7, 2025

When using Runtime Virtual Textures (RVT) on landscape in UE 5.5+, nearby tiles may remain blurry (low-resolution mips) after launching PIE or making large camera jumps (e.g. via bookmarks or viewpo ...

Windowed game window can restore to the wrong size due to DPI Awareness is configured after setting initial window size

UE - Graphics Features - Jul 31, 2025

If in use, DPI Awareness is set after the initial window size is set. For a Windowed window, the settings are unable to restore the prior resolution settings on an application restart due to the pr ...

Anamorphic Squeeze Factor causes a blocky Depth of Field issue on AMD Hardware

UE - Graphics Features - Jul 30, 2025

When using the Anamorphic Squeeze Factor on a camera on AMD RDNA3 and RDNA4 hardware, blocking artefacts may be seen depending on the extent of the blur. The peripheries of the viewport appear to be ...

GPULightmass baking issues on AMD

UE - Graphics Features - Jul 28, 2025

Volumetric Light Maps are not generated correctly when baked with GPU Lightmass on AMD GPUs. The issue has been reproduced on RX 9070, RX 9070 XT, and RX 7900 XT. ...

VALIDATE_UNIFORM_BUFFER_LIFETIME fails compilation

UE - Graphics Features - Jul 24, 2025

Also verified on Release-5.5.4 CL 40574608 ...

Farfield shadow in lumen scene

UE - Graphics Features - Jul 21, 2025

Shadows in the Lumen Scene from Lumen's Direct Lighting do not match the world when in the Lumen Far Field. This leads to shadows where there should not be any, and missing shadows where there shou ...

Cascade Shadow Map octree not handling new max world size

UE - Graphics Features - Jul 21, 2025

Cascaded Shadow Maps do not use the proper world size for octree culling. At far distances, the shadows are always culled. ...

Regression with RecomputeTangents on SkeletalMeshes in 5.6

UE - Graphics Features - Jul 21, 2025

Licensee noticed a regression in 5.6 where the non-masked recompute tangents option doesn't work anymore. The option is called "Enabled with no mask" in 5.6 but "All" in 5.5. Under the hood, this se ...