The Cosine Mix node mixes two textures together according to a cosine wave. In Figure 1, a Turbulence texture combines with an RGB color node using the Cosine Mix texture connected 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. component of an Octane material. The Mix Amount slider balances the strength of the two textures.
Figure 1: The Cosine Mix texture blends a Turbulence and an RGB texture
Figure 2: Cosine Mix Texture parameters