Creating Complex Natural Materials in Cycles - Blender Cycles Materials and Textures - page 207

Adding color variations to the rock material
18. Click on the Color2 input socket of the Mix03 node. Drag it to the empty socket of
the Group Input node. Move the new socket to the top of the list and rename it as
Rock_Color .
19. Repeat the preceding step with the Fac socket of the Mix04 node, and
rename the new socket as Rock_Darkness . Move the Vector socket on the Group
Input node to the bottom of the list.
20. Add a new MixRGB node (press Shift + A and navigate to Color | MixRGB) and a
ColorRamp node (press Shift + A and navigate to Converter | ColorRamp). Connect
the Color output of the Mix03 node to the Color1 input socket of the new MixRGB
node, and the Color output of Mix01 to the Color2 input socket.