It's part of the normal map file you are using. You can remove it or reduce the intensity with the Strength slider.
this post was submitted on 18 Feb 2024
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as others have said, those lines are baked in the texture(s), most likely to the normal map.
So... what are you making? A gold bar? Few things to consider:
- If that texture is part of a bigger model, are you sure you're using the uv-maps right? Usually you'd connect an UV-map node to the blue input of the texture.
- Do you absolutely need a normal map? Can you just disconnect it? Or just, turn down the strength of the normal mpa?
- If you need to have some normal-shenanigans going on, can you make do with eg. noise texture+bumpmap node?
- If you need it to be scratchy (eg. https://www.google.com/search?q=scratch+texture&tbm=isch), maybe search for a scratchy texture and use it with bumpmap.
Unset the texture in the material? From the picture it looks like it comes from the normal map.
The lines are baked into the texture you would need a diffrent one without lines. There are plenty free textures to use on the internet.