I have a pretty simple node setup but I have no clue how to add a dirty look to it.
Those are the nodes I’m using, I tried different things but I’m lost here.
1 Like
do you want to use an image texture or do you want to do it 100% procedurally?
I’m trying to go 100% procedural on this
You should try with these 2 nodes:
Input > Ambient Occlusion
or Geometry > Pointiness
that you plug into the factor of a MixRGB or Mix Shader
I tried both and tweaked but they don’t really do much 
you need to put a Converter > Math (multiply) or a ColorRamp node between the ones I cited and the Mix Shader factor so that you can increase the effect, and of course you need to plug 2 different enough Diffuse shaders in the Mix Shader
uv tex.blend (4.1 MB) you can do it with uv-s … clamp or repeat … the textures will go whatever you uv on … !
. something like adding decals with uv-s … and you can use ambient occlusion to act like crevases detect, or invert it to act like surface detect
Procedural is pretty new to me, so I don’t know how to actually do that. I don’t really know how to apply that to the ones I have already set up
one thing to take notice : procedural will eat a lot of cpu and gpu
1 Like
Here is what it gives, it might need to be combined with some noise to make it a bit more natural perhaps
Dont forget dirty vertex colors! always helpful.
yes but it needs a topology with enough vertices, so not always convenient I guess
You can use the Bevel Node to find all the edges and add dirt that way…there is a tutorial on YouTube but that realy forces you into cycles, doesn’t work as well in eeVee.
I was playing after I replicated your node tree…and used your original and grouped it and then added my own that I had in another file…with a mix node…That’s basically all you have to do, is find a node tree that will produce grunge as you want and add it to the original node tree…something like this…
Here is the blend-file…Stone-Dirt.blend (1.0 MB)