Weird shading effect

Hello blender artist, can somebody tell me what causes this weird shading effect?
It happens only when I`m looking at the object from a certain angle.

It’s your normals, which are being interpolated along those long faces.

Add more geometry along the planks, or add a Weighted Normal modifier.

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Damn, true, that part had no geometry for the smooth shading, i always do this usually, thanks man!

Moving post in the right topic.