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So this my object:

enter image description here

I want the YELLOW STRIPES to have zero roughness and the metalic grey cube to have a higher Roughness, how can I control that?

Here is the node Tree: enter image description here

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I tried writing this several times with only words, but it became a bit complicated. Instead, here's an example that I think is closer to how your graph should look (everything is subjective), see if you can follow what I did differently.

MixA

The main difference is that on your graph, you have 3 Mix Shaders mixing a shader with nothing, as well as a "Wave Texture Mask", placed on the "wrong" mix shader. If you have any questions, feel free to ask.

NOTE - I made the metallic part of mine extra shiny just to show the difference in roughness values. Also note that due to the transparency, if using Alpha-Blend as a blend mode, you may need to disable "Show Backface".

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  • $\begingroup$ Sorry, I missed that your mapping nodes had scale values set - I thought they were default so I removed them in my graph. Feel free to add them in where applicable. $\endgroup$
    – Christopher Bennett
    Commented Aug 13, 2021 at 0:48

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