The Polygon Side node assigns black or white values based on the normal direction of a Polygon object. This is useful for assigning different textures or materials to different sides of a Polygon object.
Figure 1 shows a Polygon Side node connected to the Amount parameter of a Mix texture. The Mix texture blends red and green RGB color nodes. The result connects 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. channel, which is applied to a twisted polygon. This technique is useful for creating a leaf or butterfly wing with different colors, or materials applied to each side.
Figure 1: The Polygon Side node used to color each side of the twisted shape
Figure 2: Polygon Side node network