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I started Blender recently, and I'm working on my first "big" project alone.

I'm creating a "backrooms", and I want to make my floor a little bit dirty and old looking with stains. I tried to play with voronoi and noise texture, but I can't find a way to get the result that I want.

My goal is to randomly apply a texture on an object that already has a material.

There is what I currently have on my floor:

screenshot of my nodes

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  • $\begingroup$ Are you trying to apply a random texture or are you saying that an object has a random chance of having a specific texture? The way you've described it is a bit confusing. You went from voronoi on the floor to random applications to different objects. $\endgroup$
    – TheJeran
    Commented Feb 4, 2022 at 14:53
  • $\begingroup$ Oops sorry if I'm not being clear enough. In addition to my carpet material on the floor, I want a mold/moisture texture at random places on the floor. I hope I better described it ahah $\endgroup$
    – Reikurooo
    Commented Feb 4, 2022 at 14:56
  • $\begingroup$ You were on the right track with voronoi or noise texture. Just use a color ramp node to to adjust the prevalence. Noise will probably be more what you want. Then use that value into a mix shader node's factor. I'll make an answer with a picture in a second. $\endgroup$
    – TheJeran
    Commented Feb 4, 2022 at 15:02

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This is the mix shader node. You can put your two shaders into the input and then use the noise or whatever as the factor for mixing between the two.

enter image description here

You can also use weight painting or vertex colors to manually draw where you want the mold.

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  • $\begingroup$ Thank you a lot for your quick answer! $\endgroup$
    – Reikurooo
    Commented Feb 4, 2022 at 15:28

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