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I'm using quads for an object, but when I use the subdivision surface modifier or even select "shade smooth" it gives these weird stripes. I have no clue how to make my object smooth now. I've checked all my normals, I've tried converting to tris and back, no luck there either.

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Will upload blend file for inspection. enter image description here

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It may not be apparent in some views, but if you check face orientation your normals are inverted on half the mesh in a striped pattern.

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A recalculate outside with everything selected should fix this.

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