Using Vertex Colors as Masks
Nathan Craddock writes:
This quick tutorial shows you how to use Vertex Colors as a mask in Blender Cycles materials. Its not ground-breaking news, but can be useful in many cases!
It is especially useful when you want to use already defined colors, such as a UV Image texture and mix it with certain areas of a mesh, without using another image (Which can use GPU memory quickly!)
Hope you all enjoy! ;)
I do this all the time. Vertex Paint mode has become Mask Paint mode :) . Very useful for separating materials on a sculpt and for laying down base colors.