I cannot seem to find any tutorials for grunge specifically inside grooves. I have tried methods using the ambient occlusion node but it just ends up looking like rust or imperfections in the metal. It is specifically the dirt in the grooves of the knurled handle I'm trying to replicate. I don't have substance painter, so I was hoping I could do it procedurally in Blender.

enter image description here

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    $\begingroup$ You could paint a b&w image with a dirt texture, that you'll use as a factor between 2 shaders $\endgroup$
    – moonboots
    Commented Jul 22, 2023 at 13:04
  • $\begingroup$ I'm up for that. Should I create a grunge texture in Photoshop? $\endgroup$ Commented Jul 22, 2023 at 17:43

1 Answer 1


Maybe mix the AO with a Noise Texture through a Mix Color in Lighten mode, plug the Mix Color into the Base Color and the Specular input of the Principled BSDF, or use the Mix Color as a factor in a Mix Shader between 2 different Principled BSDF, one being set to create the dirt.

enter image description here

  • $\begingroup$ Thank you. Looks just the solution! $\endgroup$ Commented Jul 23, 2023 at 19:22

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