It appears to me that all textures and materials in 3D-Coat are currently "Smart Materials".
My guess is that the eyes of the insect are separate UV Islands that were filled (using the Paint Bucket) with a Smart Material composed of Diffuse, Metalness and Gloss 2D textures - with varying adjustments for where to be applied, (more on cavities, more on convex areas, etc.).
When "Filling" an area of the model with a Smart Material, in this particular way - make sure to uncheck the option that appears in the Fill Dialog which says, "Use Color [Albedo] Tolerance".