Reflection result of clear coat bottom normal is not correct.

UE - Rendering - Materials - Dec 9, 2021

This problem tends to appear in the southern hemisphere of spherical objects. It is not reproduced in 4.19. ...

The VertexInterpolator connected to a Normalize node, input into BaseColor results in black Mesh LOD Coloration

UE - Rendering - Materials - Nov 16, 2021

It does not appear to matter to the repro steps what is input to the VertexInterpolator, it matters more that there is a Normalize between the VertexInterpolator and the base color input of the mate ...

Thin Translucent materials opaque with FS lighting mode and Output velocities active

UE - Rendering - Materials - Nov 15, 2021

Im not 100% sure this is a combination of settings that "should" work anyway, but need someone to have a look.Thin TranslucencyOutput velocities during base passForward Shading lighting modeProject ...

Layer blending not detecting compilation errors correctly when linked to material functions

UE - Rendering - Materials - Nov 9, 2021

This may be more of an error when detecting the input when layer blending is being used (as we've seen in other functions), rather than it necessarily being an error with the compilation of the stan ...

MakeMaterialAttributes and LandscapeLayerBlend produce unexcepted results for WorldPositionOffset

UE - Rendering - Materials - Nov 8, 2021

For comparison, this issue doesn't seem to occur when recreating the setup with Set Material Attributes/GetMaterialAttributes. It seems isolated to the Make/Break nodes. ...

Terrain layer weight parameters don't work in material layers

UE - Rendering - Materials - Sep 16, 2021

Quick look at code, seems like terrain weight parameters aren't considering MPI association or index. ...

ODSC - Launching a newly created project via UnrealFrontend fails to load some materials and crashes

UE - Rendering - Materials - Sep 6, 2021

The same repro steps on 4.26.2 will launch the project successfully. Packaging a project once to create complete ShaderMaps will work around the issue. ...

Changes to Material Instance Parent don't appear to propagate to child instances if the child instance's editor window is open

UE - Rendering - Materials - Aug 16, 2021

It looks like this occurs when the grandchild instance window is open. If you close and reopen the Grandchild's window the parameter appears as expected. I've attached a project with the setup step ...