Materials - Blender Master Class: A Hands-on Guide to Modeling, Sculpting, Materials, and Rendering - page 205

❷
❶
❹
❸
Figure 12-32: My rock material setup is somewhat complex. A Layer Weight node ❶ is used to blend between the specular and diffuse shaders. Two Voronoi textures
added together ❷ control the mixing of my rock textures (two for diffuse colors, two for specular). The textures themselves are scaled using some Map nodes ❸ , and the
specular colors are also used for displacement ❹ .