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Unexplained Circle Artifacts

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I am working on a project with an Aston Martin car that I modeled in Blender and then brought into Houdini as an .obj to simulate and render it out. While working on the materials, these weird circle artifacts randomly showed up on a few places of the mesh. They don't show up in the viewport, only the render. It's also on only about 4 of the 78 objects I brought it.


You can really see them around the license plate and right in the middle of the tail light. I have tried exporting and importing different filetypes and I tried to mess with the geometry, but nothing is working so far. Have you guys seen anything like this and know how to get rid of it?


Thanks in advanced!


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