This package contains the Ambient Grunge node group, which will allow you to get procedurally generated dirt effects over an object in Blender. The node has a variety of parameters to customize the effect, including a color input, which lets you pass a texture map.
This effect has been designed for Cycles, but will also work with EEVEE. Since it makes heavy use of the Ambient Occlusion and Bevel nodes, you may see some strange visuals when rendering animations in EEVEE (since the AO is screen-space).
Note: The free sample has now been moved to the Community Material Pack.
To use the node group in your own file, you can add it to an asset library folder of your choice (check Edit - Preferences - File Paths), alternatively append it from one of the blend file provided, or copy-paste an object with a material using the node into your own scene.
The artistic content contained in this package is governed under a Royalty Free License.