I want to use the node editor to give them each a different level of roughness
This is what I tried
I just want to make the surface rough. But I don't know how.
This is the final result that I want to have.
I need your help ;)
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Change the Color Space of the Grunge.jpg image texture to Non-Color (It's currently sRGB), and connect it to the Roughness input of the Principled BSDF (without the bump node). You can still use the image as a bump map as well, just don't connect the Bump Node to the roughness (only connect it to the normal). For either of these uses, the image still needs to be changed to "Non-Color":