The Dirt texture can create different shading effects based on ambient occlusion calculations. This texture is useful for simulating dirt, dust, or wear and tear, as well as blending textures based on the recesses of a surface.
Users often connect the Dirt texture to 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. inputs of an OctaneRender® material.
Figure 1 shows the result of connecting two RGB Spectrum textures to the inputs of a Mix texture, which is then connected to the Diffuse pin of a MaterialThe representation of the surface or volume properties of an object. node. The Dirt texture alters the Mix amount.
Figure 1: The Dirt texture node used to determine the Mix amount for two RGB Color nodes