Weird Stripes on a model With Smooth Shading

Development Rendering
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1

I made a model in Blender3D and used Smooth Shading on it. When i imported the model in UE4 i made sure to import normals and tangents and so the model is smooth and fine.
The problem is that creates these weird stripes when lit (look closely)

296108-lineswtf.png

The lines are more visible on this other screenshot:

296111-lines2.png

What is the origin of those lines? How do i fix them?

2

This is probably due to the cascaded shadow maps of you light, as you use a shadow casting, movable light, that falls very flat onto your surface.
Try playing with these settings on your light:

296545-anmerkung-2020-02-08-104615.jpg
296545-anmerkung-2020-02-08-104615.jpg467×619 54 KB