The Cosine mix texture mixes two textures together based on a cosine wave. In Figure 1, a Turbulence texture is combined with an RGB Spectrum using the Cosine mix texture that's connected to an Octane material's 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. component. The Amount slider balances the strength of the two textures.
Figure 1: A Cosine mix texture mixes a Turbulence texture and an RGB Spectrum texture