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I am working on an abandoned hospital. I would like to add graffiti here and there on the walls. The graffiti is a PNG with alpha.

I have managed a rudimentary look and feel on a test piece, to be refined a lot soon, but the graffiti seems to make the materials under it transparent too, resulting in this type of image:

enter image description here

So the question is, what should the node system be to allow three materials on one piece of wall?

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  • $\begingroup$ did you try "mix rgb"? i.imgur.com/wpm4q8O.png $\endgroup$
    – Sanbaldo
    Commented Apr 2, 2020 at 14:07
  • $\begingroup$ That's cool, and I could use that directly, had I only one material on which I need the graffiti to go. However, I have two side by side and the graffiti overlaps them both. The wall has a noise displacement to mimic stucco on the wall, and the tiles have displacement to mimic tile edges. I think my question is, how to lead out two materials with displacements so that I can add the graffiti at the latest stage. $\endgroup$
    – Heikki Hietala
    Commented Apr 2, 2020 at 15:52
  • $\begingroup$ check this tutorial --> youtube.com/watch?v=U0ZJyKyAzlA $\endgroup$
    – Sanbaldo
    Commented Apr 3, 2020 at 10:32
  • $\begingroup$ Thanks sanbaldo, but I am looking for something really basic, not a product like he's using. The thing can be boiled down to this: In the upper part of the wall, I need a stucco-like material, wiith displacement. In the lower part, I need a tile that has an image texture of tiles with displacement. On top of both, I would love to write graffiti, with a transparent PNG image texture. What I can't figure out is, do I need more than one UV map for this, or can I run everything on just one UV map. $\endgroup$
    – Heikki Hietala
    Commented Apr 3, 2020 at 12:39

1 Answer 1

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Welcome to Blender Stack Exchange!

The most common way to set this up is to have 2 shaders, one for the wall, and one for the paint.

Then, add a mix shader with both the wall and paint shaders connected. Then, use the alpha output of your image as the factor.

It would look like this:

enter image description here

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