Creating Natural Materials in Cycles - Blender Cycles Materials and Textures - page 103

33. Add a Frame, parent the last added nodes, and label it BIG WAVES , as shown in the
following screenshot:
A new frame containing a new bump effect to be added to the previous one
34. Duplicate the Bump_Strength node, unparent it from the SAND BUMP node, and set
the Operation to Add. Drag it onto the link between the Bump_Strength node and
the Material Output node, and label it Add_Bump01 .