Unreal Engine Issues

Complex morph target motion vectors flicker

Morphing target flickers when switching between complex targets. This occurs when global illumination is set to Lumen. Per talk with analyst, it greatly improves when using SSR or None instead of Lu ...

"FVector contains NaN" on packaged builds for Debug configuration

Customer Provided Description:This was experienced in UE 5.01 - custom installed engine (No changes to UE code, simply added the Debug build configuration, see the following command): "c:%ue_dire ...

Roughness map detail is lost in shadowed areas with Lumen enabled

Artifact when rendering high-resolution images with Lumen and Movie Render Queue

Artifacts when using Lumen at 8K equivalent resolution and rendering with MRQ. 8K equivalent, because the same issue occurs when the resolution is set to 4K and the Screen Percentage is set to 200. ...

Final Gather Quality Post Process setting causes severe rendering issues in the Stack-O-Bot project

When opening the Stack-O-Bot project in 5.0 Preview 1, the project has a rendering issue where bright shimmering lights appear all around the screen. I discovered that this is due to the PostProcess ...

Editor lighting components not displaying correctly with diffuse off with lumen enabled

Licensee note: "I haven’t tested with Ray tracing. I currently have lumen enable and it’s occurring there." ...

Ray traced GI denoiser blotches/artefacts

See licensee description of the issue for more info. Issue did not occur in 4.25. ...

If you use a transparent Material for one of the multiple materials, it will always show up in the raytraced reflection.

Evaluate WPO for Foliage(HISM) is based on Local Space？

GPU lightmass not baking directional light with sub levels and VTs off