The Dirt texture creates different effects based on ambient occlusion calculations. This Texture always returns a random value and can simulate dirt, dust, or wear and tear.
This Texture is often plugged into the DiffuseAmount of diffusion, or the reflection of light photons at different angles from an uneven or granular surface. Used for dull, non-reflecting materials or mesh emitters., Bump, or TransmissionA surface characteristic that determines if light may pass through a surface volume. parameters.
Figure 1: Dirt parameters
Figure 2: Dirt texture with differing Strength, Details, Radius, and Invert settings
Strength - Controls the Dirt intensity across the geometry surface.
Details - Controls the Details intensity.
Radius - Controls the dirt spread across the model's surface from the recessed parts towards the exposed parts.
Tolerance - Reduces black edges on rough tessellated meshes.
Invert Normal - Reverses the Dirt texture effect based on the normal surface direction.