Specular Highlight "Line" Artifact

Development Rendering
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1

There is this “line” removing the highlight shading, but only when the clear coat shading model is enabled

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Now lets disable the clearcoat shading model and change it to default lit

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i have no idea why this happens at all, only thing i know is that the material im using for paint and most of the mechanical bits are in one material using world space normals

2

Maybe you found an answer as this post is fairly old but thought I would share what I found today on that same issue for anyone else bumping into the same problem. I couldn’t find anything more about that issue.

You need to plug something into the Anisotropy channel. Interestingly enough, a Scalar Param equal to 0 works, but a Const1 won’t and will need at least some value (0.01 works fine for example)

Hope that helps !