The Cosine Mix texture mixes two textures together according to a cosine wave. In Figure 1, a Checks texture combines with a Marble texture using a Cosine Mix texture, and then it connects 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. channel of a Diffuse material. It is very similar to the Mix texture, but the difference between the Cosine mix texture and the Mix texture is more apparent when the Mix Amount parameter is shifted towards 0 or 1.
Figure 1: A Marble texture is blended with a Checks texture using the Cosine Mix texture
The parameters of the Cosine Mix texture consist of the inputs for the two textures, and the Mix Amount parameter. The Mix Amount parameter accepts a float value or any texture that outputs a float, such as a Greyscale Image texture.