Simple Dirt shader group (Patreon)

This blend scene contains the Simple Dirt shader group which can be used to quickly grunge up your 3D model. It's simple and easy to use. The scene has a tie fighter sample model created using the Random Flow add-on. Just append the shader node group to your scene using the hotkey F4 in the 3D viewport and you can add it in the shader window using Shift+A.